Siemens Synco700 RMK770 Documentation Handbook

Series modular boiler sequence controller

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™

Synco

700

Modular Boiler Sequence Controller

RMK770

including extension modules RMZ785, RMZ787, RMZ788 and

RMZ789

Basic Documentation

Edition 1.0

Controller series A

Building Technologies

CE1P3132en

01.03.2005

HVAC Products

Table of Contents

Summary of Contents for Siemens Synco700 RMK770

Page 1 ™ Synco Modular Boiler Sequence Controller RMK770 including extension modules RMZ785, RMZ787, RMZ788 and RMZ789 Basic Documentation Edition 1.0 Controller series A Building Technologies CE1P3132en 01.03.2005 HVAC Products...
Page 2 Siemens Switzerland Ltd © 2005 Siemens Switzerland Ltd Building Technologies Group Subject to alteration HVAC Products Gubelstrasse 22 CH -6301 Zug Tel. +41 41 724 724 24 24 Fax +41 41 724 724 35 22 www.sbt.siemens.com 2/226 Building Technologies Boiler Sequence Controller RMK770...
Page 3: Table Of Contents
Contents Summary ....................... 11 Range of units ....................11 System topology .................... 12 Equipment combinations ................12 Product documentation.................. 13 Important notes....................14 Operation....................... 15 Operation without operator unit ..............15 Operation with operator unit ................16 2.2.1 Functions of the operator unit................ 16 2.2.2 Operating concept ..................
Page 4 Device information ..................48 3.10 Leaving the password level................48 3.11 Marking changes....................48 3.12 Plant types and default terminal assignments ..........49 General settings.....................53 Time of day and date ..................53 4.1.1 Operating principle..................53 4.1.2 Communication ....................53 4.1.3 Error handling ....................54 Selecting the language ..................55 Selecting the unit of temperature ..............55 Contrast on the operator unit’s display ............55 Text entry .......................56...
Page 5 5.8.1 Changeover logic................... 72 5.8.2 Overload message and supervision of flow........... 73 Boiler sequence management............... 74 Function block overview ................74 Configuration ....................76 Boiler sequence management............... 78 6.3.1 Concept ......................78 6.3.2 Orders for boilers to be switched on and off..........79 6.3.3 Boiler sequence order ...................
Page 6 7.9.5 Boiler shutdown ...................116 7.9.6 Protection against boiler overtemperatures ..........117 7.9.7 Pump kick and valve kick................117 7.9.8 Frost protection for the plant with boiler pump..........117 7.9.9 Frost protection for the boiler ...............117 7.9.10 Protection against pressure shocks .............118 7.10 Minimum limitation of the return temperature ..........118 7.11 Flue gas temperature supervision..............119 7.12...
Page 7 9.10 Diagnostic choices..................144 Heating circuit control .................. 145 10.1 Function block overview ................145 10.2 Configuration ....................145 10.2.1 3-position or modulating mixing valve ............147 10.2.2 Pump control ....................147 10.3 Text designations for the heating circuit ............147 10.4 Auxiliary functions..................
Page 8 Function block miscellaneous ..............173 11.1 Function block overview................173 11.2 Configuration....................173 11.3 Outside sensor.....................174 11.3.1 Outside temperature simulation ..............175 11.3.2 Error handling ....................175 11.4 Display inputs....................176 11.5 Outside temperature relay ................177 11.6 Diagnostic choices ..................177 Function block faults ..................178 12.1 Function block overview................178 12.2 Configuration....................178 12.3...
Page 9 Appendix...................... 202 15.1 Configuration diagrams ................202 15.1.1 Terminal markings ..................202 15.1.2 Code letters ....................202 15.1.3 Configuration choices .................. 202 15.1.4 Configuration diagram basic type K............. 203 15.1.5 Configuration diagram plant type K1.1 ............204 15.1.6 Menu tree ....................204 15.2 Info pages....................
Page 10 10/226 Building Technologies Boiler Sequence Controller RMK770 CE1P3132en HVAC Products Contents 01.03.2005...
Page 11: Summary
Summary Range of units Type of unit Name Type ref. Controller Boiler sequence controller RMK770 Extension modules Universal module with 8 inputs RMZ785 Universal module with 4 inputs and 4 RMZ787 relay outputs Universal module with 4 inputs and 2 RMZ788 analog and 2 relay outputs Universal module with 6 inputs and 2...
Page 12: System Topology
System topology RXB… QAW740 Konnex TP1 RMZ790 RMZ791 RMK770 RMU7… RM… OCI700.1 Equipment combinations Type of unit Type reference Data Sheet no. Passive sensors Sensors using a sensing element N1721…N1846, LG-Ni 1000, Pt 1000 or T1 (PTC) N1713 Active sensors Sensors •...
Page 13: Product Documentation
Product documentation In addition to this Basic Documentation, the product documents listed below provide detailed information on the safe and correct deployment and operation of Synco™ 700 products in building services plant. Type of document Classification number Product range description "HVAC controllers with Konnex interface” S3110 Data Sheet ”Boiler sequence controller RMK770”...
Page 14: Important Notes
Synco™ 700 products may only be operated by staff who have been instructed by Operation Siemens Building Technologies or their delegates and whose attention has been drawn to potential risks. When wiring the system, the AC 230 V section must be strictly segregated from the...
Page 15: Operation
Operation Synco™ 700 devices may only be operated by staff who have been instructed by Sie- mens Building Technologies or their delegates and whose attention has been drawn to potential risks. Operation without operator unit Without operator unit, the following operating elements on the controller and extension module can be used: Controller Extension module...
Page 16: Operation With Operator Unit
Operation with operator unit 2.2.1 Functions of the operator unit The operator unit is used to make all settings and readouts required for operating the controller. All entries made on the operator unit are transmitted to the controller where they are handled and stored; the operator unit itself does not store any data. Informa- tion for the user is generated by the controller and passed to the operator unit where it is displayed.
Page 17: Operating Levels
Start display: Display examples Wednesday 01.03.05 14:52 Welcome « Information Main menu » Setting level. Selection of a setting parameter, e.g. from the main menu of the user level: Main menu Boiler sequence manager… Boiler 1… Boiler 2… Time switch… Setting level, pop-up, setting a numerical value: Entry 1 Start:...
Page 18: Access Rights
• Switching from the info level to the setting level: Switching between the operating levels 1. Select the start page by pressing the ESC button. 2. Press the OK knob to change to the setting level. • Switching from the setting level to the info level: 1.
Page 19: Commissioning
Commissioning Preparation for use and commissioning of Synco™ 700 controllers must be undertaken by qualified staff who have been adequately trained by Siemens Building Technologies. Basic concept Using the RMK770, boiler sequencing can include up to 6 boilers. When selecting a plant type, boiler sequencing with 2 boilers is predefined.
Page 20 RMK770 There are 2 choices for integrating the third boiler: Variant with Since the RMK770 does not have a sufficient number of outputs, an extension module extension module is required. Now, in the extra configuration, boiler 3 is assigned the boiler temperature sensor, the first burner stage, the boiler pump and the shutoff valve.
Page 21 Variant with a Depending on the type of plant, it may be practical to use a second RMK770 with the second RMK770 third boiler. On that second RMK770, select basic type K and assign boiler 3 the plant components boiler temperature sensor, burner stage 1, boiler pump and shutoff valve in the extra configuration.
Page 22: Entering The Commissioning Mode
Entering the commissioning mode During commissioning, the plant’s control and safety functions remain deactivated. The relays maintain their normal position, that is, their normally open contacts are open. When supplying power to the controller for the first time, the "Language“ menu appears. Here, the language for commissioning and plant operation can be selected.
Page 23 • The first digit defines the type of hydraulic circuit of the boiler sequence • The second digit defines the type of burner or the type of burner control: − Kx.1: 1-stage burner − Kx.2: 2-stage burner − Kx.3: Modulating burner with 3-position control •...
Page 24 K4.x K5.x K6.x 24/226 Building Technologies Boiler Sequence Controller RMK770 CE1P3132en HVAC Products 3 Commissioning 01.03.2005...
Page 25 Plant types and Controller Extension modules Plant type module assignment RMK770 RMZ789 RMZ787 RMZ789(2) With main pump, no shutoff valve, no boiler pump K1.1 1-stage burner K1.2 2-stage burner K1.3 Modulating burner, 3-position With main pump, with shutoff valve, no boiler pump K2.1 1-stage burner K2.2...
Page 26 Bo2.TBo Bo1.TBo MnPu Bo2.BuSt1 Bo1.BuSt1 Bo2.BuSt2 Bo1.BuSt2 TMnFl Bo1.BoPu_A Bo2.BoPu_A Bo2.VlvShOff Bo2.VlvShOff TMnRt TMnFl Main flow temperature sensor TMnRt Main return temperature sensor Bo1.TBo Boiler 1, boiler temperature sensor Bo1.TRtBo Boiler 1, boiler return temperature sensor Bo2.TBo Boiler 2, boiler temperature sensor Bo2.TRtBo Boiler 2, boiler return temperature sensor Bo1.BoPu...
Page 27 Plant types K1.1, K1.2, K2.1, K2.2 K1.x C E - K1.x and K2.x C E + RMK770 Q 12 Q 14 Q 24 Q 34 Q 42 Q 44 Q 54 Q 64 Q 74 Q 11 Q 23 Q 33 Q 41 Q 53 Q 63...
Page 28 Plant types K3.1, K4.1, K4.2: K3.x C E - K3.x and K4.x C E + RMK770 Q 12 Q 14 Q 24 Q 34 Q 42 Q 44 Q 54 Q 64 Q 74 Q 11 Q 23 Q 33 Q 41 Q 53 Q 63...
Page 29 RMZ789(1).Q4(U) Bo2.BuMdltDn Bo2.BuMdltDn Plant type K5.x K5.1 K5.x C E - C E + RMK770 Q 12 Q 14 Q 24 Q 34 Q 42 Q 44 Q 54 Q 64 Q 74 Q 11 Q 23 Q 33 Q 41 Q 53 Q 63 Q 73...
Page 30 RMZ789(1).Q4(U) Bo2.BuMdltDn Plant type K6.x K6.1, K6.2: K6.x C E - C E + RMZ789 RMK770 Q 12 Q 14 Q 24 Q 34 Q 42 Q 44 Q 54 Q 64 Q 74 Y 1 4 Y 2 4 Q 14 Q 11 Q 23...
Page 31: Terminal Assignment And Properties Of Outputs
3.3.2 Terminal assignment and properties of outputs In principle, all input and output terminals can be freely used. The terminals preas- signed when selecting the plant type can also be reconfigured. In that case, however, the special properties of the individual extension modules, and their outputs, must be taken into consideration.
Page 32: Short Designations For Basic Module And Extension Modules
With the extension modules RMZ787 and RMZ788, it is only output pair Q1/Q2 that can be used as a 3-position output, but this output is not equipped with RC units. 3.3.3 Short designations for basic module and extension modules The following short designations are used for the basic module and the extension modules: Short designation Module Basic module RMK770...
Page 33 Boiler Return Burner open Shutoff valve close Flue gas 0...10 V Flue gas mode Curr burner outp Main flow Setpoint comp. Burner Main return (Water shortage) 1 MBRT return (Overpressure) 2 Consumer return Shutoff valve (Underpressure) 3 open close 0...10 V Individual operation (Water shortage) 1 (Overpressure) 2...
Page 34 d d d d a d d d d d d Auto Boiler- Main sequence pump selection Boiler sequence manager Maint boiler return temp Boiler- pump Boiler 2 Stage Modulating MBRT 1. 2. a d d d Heating System circuit pump pump Heating circuit...
Page 35: Extension Modules
Faults Miscellaneous Time switch For more detailed information about these function blocks, refer to the following subsec- tions. 3.3.6 Extension modules RMK770 RMZ78… RMZ78… RMZ78… A maximum of 3 extension modules per RMK770 can be used. Note Prior to attaching an extension module, the plant must be disconnected from power. The order in which the extension modules are fitted is not mandatory but must corre- Order spond to the setting made on the controller.
Page 36: Extra Configuration
Main menu > Commissioning > Basic configuration Configuration example Operating line Adjustable values / remarks Plant type Basic types K, K1.1…K6.3 RMZ788 Position 1 RMZ787 Position 2 Position 1 At position 1, in this example, extension module RMZ788 is selected. Position 2 Then, at position 2, module RMZ787 is selected.
Page 37: Hydraulics-Dependent Inputs And Outputs Of Function Block "Boiler Sequence Manager
Main menu > Commissioning > Extra configuration > Boiler 1 > Inputs Example of flue gas tem- perature sensor Operating line Range Factory setting Flue gas temperature sensor RMK770…, RMZ7…* * Here, the free inputs are available The inputs on the basic module are designated RMK770.Xn, those on the extension modules RMZ…Xn.
Page 38 Main menu > Commissioning > Extra configuration > Boiler sequence manager > Outputs Operating line Range Name Main pump RMK770…, RMZ7…* MnPu_A Main pump B MnPu_B Maint boiler return temp 3-pos MnVlvRtMx Maint boiler return temp mod MnVlvRtMx * Here, the free inputs are available for selection The main flow temperature is the main controlled variable of the boiler sequence and Main flow sensor (TMnFl) must always be available with the boiler master (for more detailed information, refer to...
Page 39: Hydraulics-Dependent Inputs And Outputs Of Function Block "Boiler
3.4.2 Hydraulics-dependent inputs and outputs of function block “Boiler“ MnPu_A TFlPrCtr PrCtrVlvMx TPu_A MnPu_B BuMnSt TPu_B BuMdltUp BuSt1 TRtPrCtr BuMdltDn BuSt2 TRtBo TFlMn TRtBo BoPu BoPu_A TRtCo TRtMn VlvShOff TRtMx VlvRtMx MnVlvRtMx Main menu > Commissioning > Extra configuration > Boiler … > Inputs Operating line Range Name...
Page 40: Hydraulics-Dependent Inputs And Outputs Of Function Block "Precontrol
Compensation of boiler temperature setpoint DC 0…10 V for boilers with own boiler Setpoint compensation temperature control. (BoSetpt) Boiler pump A Boiler pump Boiler pump B, if the boiler pump is a twin pump. Boiler pump Shutoff valve Shutoff valve (VlvShOff) 3-position or modulating mixing valve for maintained boiler return temperature (for re- Maintained boiler return striction with 3-position output, refer to subsection 3.3.2 “Terminal assignment and...
Page 41: Hydraulics-Dependent Inputs And Outputs Of Function Block "Heating Circuit
System pump B, if the system pump is a twin pump. System pump B (TPu_B) 3-position or modulating mixing valve for precontrol. Mixing valve (PrCtrVlVMx) For more detailed information, refer to chapter 9 “Precontrol”. 3.4.4 Hydraulics-dependent inputs and outputs of function block “Heating circuit“...
Page 42: Heat Requisition
The setting to be selected is “Heating circuit active“; the heating circuit entries are made on the operator unit as usual. In that case, setting “Heating circuit active / inactive“ is of no importance. When a heating circuit pump and / or a heating circuit mixing valve is / are configured, Real heating circuit the heating circuit will automatically be activated;...
Page 43: Miscellaneous
Setting “Heat requisition [%] acting on“ determines whether the heat demand of the demand transformer is considered by the heat demand calculation of the boiler se- quence either directly via the main distributor or the primary controller. 3.4.6 Miscellaneous At menu item “Miscellaneous“ of the extra configuration, the following settings can be Settings made: Main menu >...
Page 44: Faults
3.4.7 Faults Main menu > Commissioning > Extra configuration > Faults > Inputs Operating line Range Name Fault input 1 RMK770…, RMZ7… Fault input 2 RMK770…, RMZ7… Fault input 3 RMK770…, RMZ7… Fault input 4 RMK770…, RMZ7… Main menu > Commissioning > Extra configuration > Faults > Outputs Operating line Range Name...
Page 45 Setting Main menu > Commissioning > Settings > … or Main menu > Settings > Inputs > … Operating line Range Factory setting Value low Depending on the se- Depending on lected type the type Value high Depending on the se- Depending on lected type the type...
Page 46: Several Boiler Sequence Controllers Rmk770
Several boiler sequence controllers RMK770 If the number of outputs do not suffice although all extension modules are fully used, or if the number of available function blocks do not suffice, the multiboiler plant must be assigned to several RMK770. But there may also be other reasons to have the plant controlled by several RMK770.
Page 47: Concluding Commissioning
Outputs The aggregates (pumps, actuators, etc.) connected to the outputs can be switched. In the case of modulating outputs, a signal can be delivered in the relevant value range. The application is deactivated during the wiring test. The outputs are in a defined OFF state;...
Page 48: Device Information
Setting Main menu > Data backup Operating line Remarks Restore Important: Caution! New configuration Save Important: Caution! Stored data will be overwritten. Device information On the “Device information" menu, information about the controller, such as the soft- ware version, can be viewed. Main menu >...
Page 49: Plant Types And Default Terminal Assignments
3.12 Plant types and default terminal assignments The terminal markings used are explained at the end of this section. Note K1.1 N.Q7 N.X1 N.X6 N.X3 N.Q2 N.Q5 N.X2 K1.2 N.Q7 N.X1 N.X6 N.X3 1. 2. 1. 2. N.Q2 N.Q5 N.Q3 N.Q6 N.X2 K1.3...
Page 50 K2.2 N.Q7 N.X1 N.X6 N.X3 1. 2. 1. 2. N.Q2 N.Q5 N.Q3 N.Q6 N.Q1 N.Q4 N.X2 K2.3 N.Q7 N.X1 N.X6 N.X3 N.Q2 N.Q5 A9.Q1 A9.Q3 A9.Q2 A9.Q4 N.Q1 N.Q4 N.X2 K3.1 N.Q7 N.X1 N.X6 N.X3 N.Q3 N.Q6 N.Q2 N.Q5 N.Q1 N.Q4 N.X2 K3.2...
Page 51 K4.1 N.X1 N.X6 N.X3 N.Q2 N.Q5 N.Q1 N.Q4 N.X2 K4.2 N.X1 N.X3 N.X6 1. 2. 1. 2. N.Q2 N.Q5 N.Q3 N.Q6 N.Q1 N.Q4 N.X2 K4.3 N.X1 N.X6 N.X3 N.Q2 N.Q5 A9.Q1 A9.Q3 A9.Q2 A9.Q4 N.Q1 N.Q4 N.X2 K5.1 N.X1 N.X3 N.X6 N.Q2 N.Q5...
Page 52 K5.3 N.X1 N.X3 N.X6 N.Q2 N.Q5 A9.Q1 A9.Q3 A9.Q2 A9.Q4 N.Q3 N.Q6 N.Q1 N.Q4 N.X2 K6.1 N.X1 N.X3 N.X6 N.Q2 N.Q5 N.X7 N.X4 N.Q1 N.Q4 A9.Q3 A9.Q1 A9.Q4 A9.Q2 N.X2 K6.2 N.X1 N.X6 N.X3 1. 2. 1. 2. N.Q2 N.Q5 N.Q3 N.Q6 N.X7...
Page 53: General Settings
General settings Time of day and date 4.1.1 Operating principle The controller has a yearly clock with time of day, weekday and date. The following time formats are available: Time format Time format Date Example Time of day Example 24 hours dd.mm.yyyy 31.05.2004 hh:mm...
Page 54: Error Handling
Operating line Range Factory setting Clock time operation Autonomous / Slave / Autonomous Master If the controller is set as a clock time slave, it can also be selected whether it shall be possible to adjust the master clock’s time of day from this controller. The following remote settings for the clock time slave are possible: •...
Page 55: Selecting The Language
Number Text Effect 5002 >1 clock time Nonurgent message; must be acknowledged master Nonurgent message; must not be acknowledged 5001 System time failure 5003 Invalid time of Nonurgent message; must not be acknowledged Selecting the language Every RMK770 controller has a number of languages loaded. When switching on the controller for the first time, the required language must be entered.
Page 56: Text Entry
Text entry 4.5.1 Device name and file name Setting Main menu > Commissioning > Settings > … or Main menu > Settings > Texts Operating line Range Factory setting Device name Free text, max. 20 characters Device name The text of the device name appears on the start page in place of “Welcome“. File name The file name is only of importance in connection with the ACS7…...
Page 57 Settings Main menu > Commissioning > Extra configuration > Miscellaneous Operating line Range Factory setting Business card Yes / No Main menu > Commissioning > Settings … or Main menu > Settings > Texts Operating line Range Factory setting Business card line 1 Business card line 2 Business card line 3 Business card line 4...
Page 58: General Functions, Fundamentals
General functions, fundamentals Time switch A time switch is available for the heating circuit. In “Automatic” mode, the heating cir- cuit, operates according to that time switch. A switching program can be defined for each day of week. Using the program entered, the time switch controls the change of operating modes and the associated setpoints.
Page 59: Entering The 24-Hour Program For Space Heating
Configuration Main menu > Commissioning > Extra configuration > Miscellaneous Operating line Range Remarks Time switch On / Off Activation of time switch 5.1.3 Entering the 24-hour program for space heating For space heating, a specific 24-hour program can be selected for every day. Space heating Main menu >...
Page 60: Error Handling
5.1.4 Error handling For each "Geographical zone", only one time switch master may be used. If several controllers are parameterized as the master, a fault status message will be delivered. The message is sent by the controller which receives 2 time switch signals. Fault status messages Number Text...
Page 61: Holidays
Entry Effect Diagram Master The holidays/special days program in this controller is active. The holidays/special days program also acts on all other controllers where the holi- days/special days program is switched off (slave) and which lie in the same holi- days/special days zone.
Page 62: Calendar Entry
(slaves). The time of the special day is a preselection made by the master and applies to all controllers in the same holidays/special days zone. 5.2.4 Calendar entry A maximum of 16 entries can be made. The entries are sorted in chronological order. Every entry must include: •...
Page 63: Error Handling
Priority If, at the same time, a special day or a holiday period is activated via the control switches and an entry in the calendar, the following priority will apply: 1. Control switch “Special day” 2. Control switch “Holidays” 3. “Special day” entry in the calendar 4.
Page 64: Pump Overrun And Mixing Valve Overrun
Sequence of functions The sequence of frost protection for the plant is as follows: ON/OFF Outside temperature Pump Diagram <–5 °C (TO Permanently on –4…+2 °C On for 10 minutes every 6 hours ON / OFF >2 °C (TO Permanently off Adjustable are the following temperatures: •...
Page 65: Heat Demand And Load Control
To prevent the pumps and valves from seizing, a point in time (kick day and kick time) can be defined at which the pumps are put into operation and the valves are driven to their fully open and fully closed positions. The function can be deactivated (pump / valve kick = ---).
Page 66: Load Control
Example 2: Heat source, primary controller and heat consumer Heat consumer / Heat primary controller source Heat Heat consumer consumer Heat Heat consumer consumer The heat demand signals can be assigned a priority. If, for example, DHW heating is operated with absolute priority, its heat demand signal must be given priority.
Page 67: Mixing Valve Control
In the case of pump / mixing valve overrun, the heat consumers are requested to draw heat at the same level for a certain period of time (overrun time) although they require no more heat. Overrun is typically triggered by a boiler after the burner has shut down in order to prevent overtemperatures in the boiler.
Page 68: Setting Aids
Operating line Range Factory setting Setp boost mixing valve 0…50 K 10 K Actuator run time 1…600 s 120 s P-band Xp 1…100 K 48 K Integral action time Tn 0…600 s 10 s To enable a mixing circuit to control its flow temperature to the setpoint, it requires a higher flow temperature on the inlet side.
Page 69 Degree of difficulty The degree of difficulty λ is calculated as follows: λ = For the degree of difficulty of a controlled system, the following guide values can be used: λ <0.1 = easy λ λ 0.1… 0.3 = medium λ...
Page 70: Control Signal
Flow temperature ap- Setpoint proaches the setpoint only slowly Flow temp. Open pulse Close pulse Open pulse Close pulse A Difference between the first pulse and the following pulses is small: Measure the effective actuator running time (0…100 % stroke) and enter it. If the control behavior does not considerably improve: Increase P-band Xp B Long starting pulse followed by many short pulses: Decrease integral action time Tn The actuator running time must be matched to the type of actuator used.
Page 71: Pump Control And Twin Pumps
For 3-position control, the actuator’s current position is acquired by a stroke model. As Synchronization soon as the stroke model reaches 0 % or 100 % respectively, a synchronization signal pulse (continuous on pulse or continuous off pulse for 1.5 times the running time) is delivered to the actuator, thus making certain it has reached the relevant position.
Page 72: Changeover Logic
Setting Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler sequence manager > Twin pump Main menu > Settings > Boiler … > Twin pump Main menu > Settings > Primary controller > Twin pump Main menu >...
Page 73: Overload Message And Supervision Of Flow
Changeover with The changeover from pump A to pump B is made after a certain pause, e.g. to prevent voltage peaks or excessive water pressures. positive delay Depending on the changeover priority, the pump kick will act as follows: Pump kick Operating state of the Impact of pump kick pumps...
Page 74: Boiler Sequence Management
Boiler sequence management Function block overview a d d d d d d d d d d Auto Boiler- Main sequence pump selection Boiler sequence manager Maint boiler return temp TMnFl Main flow temperature sensor Inputs TMnRt Main return temperature sensor TRtMx Return sensor MBRT TRtCo...
Page 75 BS Release HD (DC 0…10 V) HD gen. HD DHW Auto HD Frost MnPu_A WLoLeDet PMaxMon MnPuErFlow MnPuEr_A MnPu_B MnPuEr_B TMnFl TRtMx PMinMon TMnRt TRtCo MnVlvRtMx TMnFl TMnRt TrtMx TRtCo HD DC 0…10 V HD gen. MnPu_A HD DHW MnPu_B HD Frost Rel_ BS MnVlvRtMxUP...
Page 76: Configuration
Configuration By selecting a plant type in the basic configuration, function block “Boiler sequence Basic configuration manager“ will be activated. If several RMK770 are used, the function of boiler sequence manager is always assumed by the RMK770 that can acquire a measured value of the main flow temperature.
Page 77 Outputs Main menu > Commissioning > Extra configuration > Boiler sequence manager > Outputs Operating line Adjustable values / remarks Main pump Main pump B Maint boiler return temp 3-pos Maint boiler return temp mod In the extra configuration, additional functions can be activated for the basic functional- ity of the selected plant type (for more detailed information, refer to the following sec- tion).
Page 78: Boiler Sequence Management
Heat requisition Heat requisitions from other devices can be accepted via bus. In addition, 3 binary inputs and 1 analog input are available for signaling heat requisitions. Boiler sequence management 6.3.1 Concept TBo2 TBo1 MnPu_A MnPu_B TMnFl TRtMx TMnRt TRtCo MnVlvRtMx With the signal received from the main flow temperature sensor, the boiler sequence manager controls the individual boilers or burner stages of the boiler sequence.
Page 79: Orders For Boilers To Be Switched On And Off
When using a small increase or no increase at all, the relevant lag boiler will also oper- ate in control mode. This can be desirable in the case of boiler sequences with several modulating burners. Control of the burner, boiler pump and actuating devices is ensured by the individual “Boiler“...
Page 80 with 3 binary inputs between Auto – 1 – 2 – 3 – 4 – 5 – 6. The selector must be appropriately wired. Auto 1 Position 1 Auto Position 2 Boiler 1 Position 3 Boiler 2 Position 4 Boiler 3 Position 5 Boiler 4 Position 6...
Page 81 If the period of time for the changeover interval is set to ---, there will be no automatic changeover. To make certain that changeover to another lead boiler does not take place at an awk- ward point in time (e.g. on a weekend), the time of changeover (weekday, time of day) can be set.
Page 82: Boiler Sequence Order
If required, a boiler can be locked depending on the outside temperature. Locking of boiler depending on the Main menu > Commissioning > Settings > … or outside temperature Main menu > Settings > Boiler … > Operation settings Operating line Range Factory setting Outside temp lock limit value...
Page 83 Heat demand or load Burner stage in continuous operation Burner stage cycling Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler … > Operation settings Operating line Range Factory setting Setpoint increase lag boiler 0…50 K 10 K A great setpoint increase (to be set separately on each boiler) allows the lead boiler to...
Page 84: Boiler Sequence Operating Mode
Output stage Boiler release 1.1+1.2 2.1+2.2 1.1+2.1+2.2 This switch-on order is called binary switching on. With the RMK770, binary switching on is restricted to the first 2 boilers. The next boilers are switched sequentially. With binary switching on, boiler 2 is always the controlling boiler. Example Binary switching of boiler sequence with 2 boilers: Output of boiler 1 = 100 %, output of boiler 2 = 200 %...
Page 85: Sustained Mode
In the “Release DHW“ mode, the only type of heat requisition considered is that of DHW heating (digital input or via Konnex bus). Other types of heat requisition will be ignored. Requisitions of the emergency type are always considered. In “Off mode, the only type of heat requisition taken into consideration is that of emer- gency (e.g.
Page 86 Operating line Range Factory setting Upward sequence delay 0…255 min 5 min Shortened upward seq DHW 0…100 % Switching boilers on Switching on via tempera- Additional boilers are released only if, for a certain period of time, the main flow tem- perature stays below the neutral zone about the setpoint.
Page 87 the value set. And for every additional boiler, the accelerated performance of the inte- gral applies. The switch-on delay is at its initial value again. When there is a valid temperature requisition, it is always the basic stage of at least one Switching boilers off boiler that is released.
Page 88 Example The diagram above shows an example with 4 modulating boilers that are sequentially switched on and off. The basic stage of the first boiler be 30 % of the rated capacity. As heat consumption increases, each boiler modulates up to 100 kW (100 %) before the next boiler is switched on.
Page 89: Supervision Of Faults
Note If the boilers cannot modulate at a sufficiently low level, the main flow temperature will rise until a boiler is switched off via the temperature-time integral. Supervision of faults The main pump (main twin pump) can be monitored with an overload input each and / Supervision of or a flow switch each (…...
Page 90 Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler sequence manager > Fault settings > Fault input 3 Operating line Range Factory setting Fault text A…Z Underpressure Impact of fault Stop / No stop Stop Fault acknowledgement None / Acknowledge /...
Page 91: Heat Demand And Heat Requisition
The other sensors which also belong to function block “Boiler sequence manager“, such Sensor supervision in as the return sensor for the common maintained boiler return temperature, or the return general sensor for the consumers, are monitored for short-circuit and open-circuit. Number Text Effect...
Page 92 Heat demand can be predefined with a DC 0…10 V signal. Heat requisition The signal can be matched to the DC 0…10 V signal source: modulating Main menu > Commissioning > Settings > … or Main menu > Settings > Inputs > Heat requisition boiler sequence Operating line Range Factory setting...
Page 93: Other Functions
Other functions 6.6.1 Common maintained boiler return temperature Minimum limitation of the return temperature shall ensure that, by the boiler inlet also, the temperature will not drop below the permissible value. In most cases, this is solved separately on each individual boiler. But it is also possible to perform this function for all boilers from a central location.
Page 94: Maximum Limitation Of The Flow Temperature Setpoint
The main pump, like the boiler pump, never responds to locking signals. Whether or not the system pump shall respond to locking signals can be selected on function block “Primary controller”. Main menu > Commissioning > Settings > … or Main menu >...
Page 95 Boiler sequencing Addr. no. Release: Burner: Faults: Boiler sequence manager State Cause Number of available boilers Boiler sequence manager Main flow temp actual value Main flow temp setpoint Main return temp actual value BRT return temp actual value Boiler 1 Actual value boiler temperature Boiler temperature setpoint State...
Page 96: Error Handling
Operating line Range [Boil address no 3] actual temp [Boil address no 4] actual temp [Boil address no 5] actual temp [Boil address no 6] actual temp Main menu > Boiler sequence manager > Inputs / Setpoints Operating line Range Main flow temp actual value Main flow temp setpoint Main return temp actual value...
Page 97 Number Text Effect Error main pump 2491 [Main pump] overload Nonurgent message; must be acknowl- edged and reset 2492 [Main pump B] overload Nonurgent message; must be acknowl- edged and reset 2493 [Main pump] no flow Nonurgent message; must be acknowl- edged and reset [Main pump B] no flow 2494...
Page 98: Boiler Temperature Control
Boiler temperature control Function block overview Boiler- pump Boiler 1 Stage Modulating MBRT 1. 2. Boiler temperature sensor Inputs TRtBo Return temperature sensor Release Bo Boiler release input BuFb Checkback signal burner stage 1 BuMdltFb Checkback signal modulating burner, current burner output ShOffVlvFb Checkback signal shutoff valve Flue gas temperature sensor...
Page 99: Configuration
PMaxMon(Er2) WLoLeDet(Er1) BuSt1 BuFb BuSt2 BuMdltFb BuMdltUp ErBu BuMdltDn BuMdlt_0…10 V TRtBo BoSetpt BoPuEr_A BoPu_A BoPuEr_B BoPu_B BoPuErFlow PMinMon(Er2) VlvShOff VlvRtMxUp ShOffVlvFb VlvRtMxDn VlvRtMx_0…10 V ReleaseBo InIndOp InFgMsm BoCtrl BoPuEr_A BoPuEr_B BoPuErFlow Error BuSt1 ErBu BuSt2 BuFb BuMdltUp Er1 (WloLeDet) BuMdltDn BuMdltDn_DC 0…10 V Er2 (PMaxMon)
Page 100 In the extra configuration, the basic configuration can be complemented and / or Extra configuration amended. Together with the plant type, it is always 2 boilers with the same type of burner and same boiler hydraulics that are selected. There is a choice of 3 types of burner: •...
Page 101 With the basic configuration, a boiler temperature sensor is automatically configured for Boiler sensor each of the boilers 1 and 2. The boiler temperature sensor is required if the burner shall maintain a boiler temperature setpoint and / or if minimum or maximum limitation of the boiler temperature shall be ensured.
Page 102: Burner Types
7.2.1 Burner types By selecting the plant type, the type of burner is predefined for 2 boilers of the boiler sequence. • Kx.1: 1-stage burner • Kx.2: 2-stage burner • Kx.3: Modulating 3-position The relevant outputs are preconfigured. The outputs can be changed in the extra configuration. First burner stage or basic stage of a modulating burner.
Page 103 The single pump or twin pump can be monitored with a fault input and / or a flow switch. For more detailed information, refer to section 5.8 “Pump control and twin pumps”. If, in addition, a main pump shall be configured, this must be done on the “Boiler se- quence manager”...
Page 104: Additional Boilers
Operating line Range Factory setting Switch-on delay pump 0…255 s Switch-on delay burner 0…255 s Shutoff valve (MBRT) Open / Closed Open If both the pump’s switch-on delay and the burner’s switch-on delay are parameterized, first the pump will be activated on completion of the pump’s switch-on delay; then, on completion of the burner’s switch-on delay, the burner will be released.
Page 105: Releasing And Locking A Boiler
Operating line Range Factory setting Cause Commissioning / Frost protection for con- sumer / Overtemp protection/overrun / Frost protection for boiler / Operating mode selector / Protective boiler startup / Release delay burner / Outside temperature lock / Minimum limitation boiler / Test mode / Flue gas measuring mode / Individual operation /...
Page 106: Individual Operation
Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler … > Operation settings Operating line Range Factory setting Outside temp lock limit value ---- / 5…30 °C ---- °C Individual operation In the extra configuration, a digital control input for “Individual operation“ can be config- ured for boiler 1.
Page 107: Burner Control
In “Auto“ position, the boiler is released and receives its presettings from the boiler Auto sequence manager. The boiler is shut down, that is, burner and pumps are switched off. Boiler Off The boiler is released. The aggregates (shutoff valve, maintained boiler return tempera- Pump on (burner off) ture with mixing valve, boiler pump) are active, but the burner is still switched off.
Page 108: 2-Position Control Of 2-Stage Burners
SDBo SDBo TBoSp SDBo Boiler switching differential Boiler temperature TBoSp Boiler temperature setpoint If the switch-off point is reached before the minimum burner running time is completed, Minimum burner running the burner will remain in operation until that time has elapsed (burner cycling protec- time, burner cycling tion).
Page 109 The release logic for 2-stage burner operation aims at ensuring an optimum switch-on Burner stage 2 time for stage 2 which, in addition to a time criterion, also considers the amount of the heat deficit, calculated with a temperature-time integral. Time criterion As soon as the burner’s basic stage is switched on, the minimum locking time for burner stage 2 starts to run.
Page 110: Control Of Modulating Burners
Owing to the performance of the temperature-time integral, it is not only the period of time that is considered, but also the extent of overshoot. This means that when the overshoot is significant, burner stage 2 will be locked earlier. When the reset integral (area "b"...
Page 111 When the demand for heat is small, the basic stage cycles. When the demand for heat increases, the 3-position output or a DC 0…10 V output is used to control the combus- tion air damper. At the same time, the amount of fuel supplied will also be increased, typically via an additional switch on the air damper, or by simultaneous control of the amount of fuel (gas / fuel ratio).
Page 112 TBoSp+SDBo TBoSp+½ SDBo TBoSp TBoSp-½ SDBo Basic Modulat. Release integral for modulation Release integral modulation (release integral stage 2 with 2-stage burner) Reset integral modulation (reset integral stage 2 with 2-stage burner) Neutral zone On / off pulses SDBo Boiler switching differential St Basic Burner’s basic stage St Modul.
Page 113 The proportional band has an impact on the controller’s proportional behavior. Proportional band Xp With a setpoint / actual value deviation of 20 K, a setting of Xp = 20 K produces a ma- nipulated variable corresponding to the damper actuator’s running time. The integral action time has an impact on the controller’s integral behavior.
Page 114: External Burner Control
If the control’s response is too ”hefty” so that it overshoots or starts oscillating, setting Control action is parameters Xp, Tn and Tv must be increased in a stepwise fashion. A new readjust- too fast ment should be made only after the control action resulting from the previous readjust- ment is completed.
Page 115: Maximum Limitation Of The Boiler Temperature
7.9.1 Maximum limitation of the boiler temperature This setting provides maximum limitation of the boiler temperature setpoint. For burner control, this value represents the switch-off point. In this range, the boiler’s switching differential is calculated downward. Maximum limitation of the boiler temperature is always active. The only exception is the wiring test.
Page 116: Optimization Of The Minimum Boiler Temperature
In case of plants with mixing valve for the maintained boiler return temperature, the protective boiler startup function is provided by the mixing valve. In that case, no lock- ing signals for the protective boiler startup will be generated. Boiler pump It can be selected whether or not the boiler pump shall be switched off when protective boiler startup is active (pump off).
Page 117: Protection Against Boiler Overtemperatures
Without boiler shutdown Using this setting, the boiler is always maintained at the minimum boiler temperature. When using this setting, the boiler is operated at the minimum boiler temperature Automatic boiler shut- down whenever there is a heat requisition from one of the heat consumers. When there is no heat requisition, the boiler temperature can drop below the minimum boiler tempera- ture.
Page 118: Protection Against Pressure Shocks
7.9.10 Protection against pressure shocks Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler … > Limitations Operating line Range Factory setting Delta boiler temp max (stage 2) 0…10 K To prevent pressure shocks in the gas network if stages 1 and 2 switch off at the same time, stage 2 is already switched off before the maximum boiler temperature is reached the difference being the setting value “Boiler temp max”...
Page 119: Flue Gas Temperature Supervision
The terminals still available for selection are the free terminal pairs (Q1/Q2, Q3/Q4, Configuration of a pair of Q5/Q6) for the open and the close signal. Generally, special terminal pairs are required terminals for a 3-position for that purpose (RC units for radio interference suppression; for more detailed informa- mixing valve tion, refer to subsection 3.3.2 “Terminal assignment and properties of outputs”).
Page 120: Flue Gas Measuring Mode
It is always the maximum flue gas temperature that is saved and displayed. On the menu line that shows the value, the value can be reset to 0 °C, thereby adopting the current value. The maximum value is filtered to suppress faults. As a result, the maximum flue gas temperature rises at the rate of maximum 1 K/s.
Page 121: Boiler Faults
7.13 Boiler faults If a boiler initiates lockout, it will be shut down until the fault is rectified. A boiler is considered faulty if one of the following faults occurred: • Fault of burner • Fault of boiler pump • Fault of shutoff valve (no checkback signal) •...
Page 122 Operating line Range Factory setting Signal delay start 00.05…59.55 m.s 04.00 m.s Signal interruption operation 00.00…59.55 m.s 20.00 m.s Impact of fault No stop / Stop Stop Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler … > Fault settings > Checkb sign shutoff valve Operating line Range Factory setting...
Page 123: Burner Hours Run Counter And Output Balance
Operating line Range Factory setting Normal position Open / Closed Open For more detailed information, refer to section 5.8 “Pump control and twin pumps”. Fault supervision boiler pump 7.14 Burner hours run counter and output balance For stage 1 or the basic stage, a checkback signal can be configured. This checkback signal can be used for the burner hours run counter, the burner start counter, and for calculating the output balance.
Page 124 Number Text Effect Error boiler tempera- [Boiler 1] boiler sensor Urgent message; must be acknowledged. ture sensor error Aggregate stop boiler 1 [Boiler 2] boiler sensor Urgent message; must be acknowledged. error Aggregate stop boiler 2 [Boiler 3] boiler sensor Urgent message;...
Page 125 Number Text Effect 2303 [K3 burner] fault Urgent message; must be acknowledged. Aggregate stop boiler 3 2304 [K4 burner] fault Urgent message; must be acknowledged. Aggregate stop boiler 4 2305 [K5 burner] fault Urgent message; must be acknowledged. Aggregate stop boiler 5 2306 [K6 burner] fault Urgent message;...
Page 126 Number Text Effect Supply state: Urgent, boiler stop, must be acknowledged 2332 [Boiler 2] overpressure Priority, effect and acknowledgement can be parameterized. Supply state: Urgent, boiler stop, must be acknowledged 2333 [Boiler 3] overpressure Priority, effect and acknowledgement can be parameterized.
Page 127 Number Text Effect 2352 [K2 valve] no checkback Urgent message; must be acknowledged signal and reset. Aggregate stop boiler 2 2353 [K3 valve] no checkback Urgent message; must be acknowledged signal and reset. Aggregate stop boiler 3 2354 [K4 valve] no checkback Urgent message;...
Page 128: Boiler Designations
Number Text Effect edged and reset. No aggregate stop boiler 4 2415 [K5 pump] no flow Nonurgent message; must be acknowl- edged and reset. No aggregate stop boiler 5 2416 [K6 pump] no flow Nonurgent message; must be acknowl- edged and reset. No aggregate stop boiler 6 Overload Number Text...
Page 129: Diagnostic Choices
The overview on the info page continues to show the boiler numbers, but the boiler- specific info page uses the boiler designations. The menu also uses the boiler designations entered here. Example of a boiler Main menu > Commissioning > Settings … Main menu >...
Page 130 Operating line Adjustable values / remarks Boiler pump Boiler pump B Shutoff valve Maint boiler return temp 3-pos Maint boiler return temp mod Main menu > Boiler … > Limitations Operating line Adjustable values / remarks Boiler temperature max Boiler temperature min Protective boiler startup Boiler return temperature min Burner run time min...
Page 131: Heat Demand And Heat Requisitions
Heat demand and heat requisitions Heat requisitions The following sources can deliver heat requisitions to the controller: • The internal heating circuit • External controls (KNX) via bus • As continuous DC 0…10 V signals • As 2-position signals Heat requisitions can be delivered either directly or via the primary controller. Primary controller direct...
Page 132: Weather-Compensated Setpoint For Boiler Sequencing
Weather-compensated setpoint for boiler se- quencing There may be a need to operate the boiler sequence according to a weather- compensated setpoint without having a heating circuit. This can be the case if, for ex- ample, a great effort would be required to integrate existing consumer circuits into the new system.
Page 133 Example: Air handling plant Room unit Air supply area (in reference room) Ventilation Central RMU... air handling 0...100 % Refrigeration Heat demand demand transformer transformer Chilled water Precontrol Precontrol precontrol precontrol refrigeration heating RMH760 RMH760 Based on the valve position of the air handling plant(s), the heat demand transformers calculate a flow temperature setpoint.
Page 134 Flow temperature Max. flow temp. (Curve point 1): readjustment Flow temp. (Curve point 2): Flow temp. (Curve point 1): (Curve point 2): Outside Outside temp. Outside temp. temperature The adaptation of the flow temperature can be set as follows: • The speed of flow temperature readjustment can be set under > Demand control > Control action •...
Page 135: Precontrol
Precontrol Function block overview a d d d System pump Primary controller Return temp. limit Flow temperature sensor Inputs Return temperature sensor Fault input “System pump A“ Fault input “System pump B“ Flow supervision “System pump“ Heat requisition modulating (DC 0…10 V) Heat requisition 2-position DHW requisition 2-position Frost protection requisition 2-position...
Page 136: Configuration
Configuration Basic configuration Function block “Primary controller“ must always be activated in the extra configuration. The function block is activated by assigning an output to a terminal. Extra configuration Outputs Main menu > Commissioning > Extra configuration > Primary controller > Outputs Operating line Adjustable values / remarks System pump...
Page 137: Control Of Mixing Valve
By configuring the outputs, it is defined whether a primary controller type 1 or type 2 is used. Without configuration of a mixing valve, type 2 is automatically used. It is also possible to define a flow temperature boost with the type 2 controller to compensate for temperature losses in the case of long pipes.
Page 138: Text Designation Of The Primary Controller
Main menu > Settings > Primary controller > Mixing circuit controller Operating line Range Factory setting [Tn] return temp limitation max 0…60 min 30 min If the return temperature falls below the limit value, the primary controller’s flow tem- Minimum limitation of perature setpoint will be lowered.
Page 139: Heat Demand And Heat Requisition
Heat demand and heat requisition HD HC KNX HD DHW KNX HD PrCtr KNX HD DC 0…10 V HD PrCtr HD on/off (standard) HD on/off DHW HD on/off Frost protection Transformer Function block “Primary controller” collects the heat demand signals from all heat con- sumers.
Page 140: Heat Requisition 2-Position
°C DC 0...10 V Value in °C at DC 0 V Value in °C at DC 10 V Limit value for heat demand (temperatures below this level are interpreted as “no heat demand”) “Value low” is defined as the flow temperature setpoint at DC 0 V; “Value high” as the flow temperature setpoint at DC 10 V.
Page 141: Heat Demand Transformers
9.5.3 Heat demand transformers The heat demand transformer described in chapter 8 “Heat demand and heat requisitions” can be linked either to the primary controller or directly to the boiler sequence manager (main distributor). The selection is made in Extra configuration > Heat requisition [%] When using setting heat requisition [%] on the “Primary controller”, the transformer is linked to the primary controller.
Page 142: Limit And Protective Functions
Main menu > Settings > Primary controller > Primary controller Operating line Range Factory setting Setp boost primary controller 0…50 K 10 K Limit and protective functions 9.8.1 Frost protection Here, the setting is made whether or not function “Frost protection for the plant” shall Frost protection act on the pump for precontrol.
Page 143: Pump Overrun And Mixing Valve Overrun
System pump and Setting “System pump locking signal = Off“ means that the system pump shall also locking signals respond to locking signals. Settings Main menu > Settings > Primary controller > Limitations Operating line Range Factory setting Flow temperature max 0…140 °C 140 °C Flow temperature min...
Page 144: Diagnostic Choices
Number Text Effect Error heat requisition 2201 Heat requisition mod error Nonurgent message; must not be acknowl- modulating edged An error at the input will be interpreted as “No heat demand”. Text Effect Fault primary control- ler or 2501 [System pump] overload system pump 2502 [System pump B] overload...
Page 145: Heating Circuit Control
Heating circuit control 10.1 Function block overview Heating circuit pump Heating circuit Heat requis. acting on Return temp limit Main distributor Primary controller Flow temperature sensor Inputs Return temperature sensor Room temperature sensor Room setpoint abs. Room setpoint rel. Room operating mode Timer function Fault input heating circuit pump A Fault input heating circuit pump B...
Page 146 The function block is activated Extra configuration • by assigning an output to a terminal, or • by setting “Heating circuit = Active“ Main menu > Commissioning > Extra configuration > Heating circuit Operating line Range Factory setting Heating circuit Inactive/ Active Inactive Using setting “Heating circuit = Active“, a virtual heating circuit can be activated, which...
Page 147: 3-Position Or Modulating Mixing Valve
Heat requisition heating circuit: Primary Controller Heat requisition heating circuit: Main distributor 10.2.1 3-position or modulating mixing valve Mixing valve control can be accomplished with a 3-position mixing valve or a mixing valve using DC 0…10 V control. The type of actuator is selected in the extra configura- tion.
Page 148 Averaging A heating circuit can handle a maximum of 2 room temperatures. It is of no importance whether the room temperature is acquired locally or via Konnex bus. The average will be generated from the 2 actual values. The type of room temperature sensor can be selected (example with input terminal Types of sensors RMK770.X4): Main menu >...
Page 149: Limitation Of The Return Temperature
Variant Effect Diagram 2 room sensors or If the RMK770 on the bus is Synco 1 Konnex room activated, the heating circuit sensor and 1 room receives the room temperature unit QAW740* of the same geographical zone. The heating circuit operates with the average of the 2 tempera- ture signals received.
Page 150: Room Temperature Setpoint Adjuster, Absolute
value, the lowering of the flow temperature setpoint will be gradually reduced. The function operates with I-control action and an adjustable integral action time Tn. Main menu > Commissioning > Settings > … or Main menu > Settings > Heating circuit > Controller Operating line Range Factory setting...
Page 151: Room Temperature Setpoint Adjuster, Relative
10.4.4 Room temperature setpoint adjuster, relative For the room temperature setpoint readjustment in the Comfort and Precomfort modes, a remote setpoint adjuster (e.g. QAA27 with room temperature sensor) can be configured. For more detailed information, refer to section 10.5.2 “Room temperature setpoints”. Extra configuration The input is activated via the extra configuration: Main menu >...
Page 152: Room Control Combination
Settings Main menu > Commissioning > Settings > … or Main menu > Settings > Heating circuit > Space heating Operating line Range Factory setting Timer function* 0…720 min 60 min * This setting does not apply to the QAW740 room unit; in that case, the setting is made directly on the room unit The activated timer can be stopped by changing the room operating mode (e.g.
Page 153 Solution: Using the extra function “Room control combination”, 1 of the 2 heating circuits as the master can preselect the operating mode for the second heating circuit, which is con- figured as the slave. If required, the setpoints can also be adopted by the master. This is accomplished with configuration “Slave external setpoint“.
Page 154: Room Operating Modes And Room Temperature Setpoints
Important The ventilation controller’s room temperature sensor must not be installed in the extract air duct! Otherwise, functions “Room temperature influence” and “Type of optimization” with room temperature may not be activated. 10.5 Room operating modes and room tempera- ture setpoints 10.5.1 Room operating modes The room operating mode determines the preselected setpoint for the room tempera- ture.
Page 155: Room Temperature Setpoints
10.5.2 Room temperature setpoints Room temperature set- The setpoints for the 4 room operating modes can be preselected by the plant operator points (settings) via operation. The setting values limit each other. Main menu > Heating circuit > Room setpoints Operating line Range Factory setting...
Page 156: User Requirements In The Room
User requisition external / Overtemp protec- tion/overrun / Plant operation selector / No requisition / Frost protection for the flow / Frost protection for the plant * Frost protection is ensured Preselection The heating circuit can be switched off for service purposes. On completion of pump overrun, the mixing valve will close and the heating circuit pump will be switched off.
Page 157: Control Priorities In The Heating Circuit
User interventions can also take place via a third-party device with Konnex interface. Third-party devices with Konnex interface Presence button mode, the presence button is used to switch over the room operating mode until the time switch reaches the next switching point. Changeover takes place between Comfort or Precomfort and Economy mode.
Page 158: Weather-Compensated Heating Circuit Control
Priority Name Explanation External master If the heating circuit operates in a room control combination as a slave, the operating mode is preselected by the external master (heating circuit or ventilation). In that case, interventions of priority through can only be made on the master Room optg mode contact Using the room operating mode contact, a fixed operating mode can be preselected.
Page 159: The Composite And The Attenuated Outside Temperature
The controller provides a common outside temperature for all applications. This means that outside temperature-dependent functions of the same controller operate with the same outside temperature as the compensating variable. Composite outside Depending on the type of building construction, the outside temperature has a delayed temperature impact on the room.
Page 160: Heating Curve
= 50% The controller is supplied with the proportion of windows set to 50 % so that the com- Window posite outside temperature represents the mean value of actual and filtered outside temperature. It is calculated as follows: Toeff = (0.5 × To) + (0.5 × Tofil) ToStrDmp Toeff Settings...
Page 161 Heat transmission via… Radiator exponent nH Underfloor heating system 1.05…1.1 Flat radiators 1.26…1.33 Radiators to DIN 4703 Convectors 1.25…1.45 Inflection point With a radiator exponent nH between 1…1.5, the heating curve is only slightly deflected and can therefore be replaced by linearized sections. This is achieved by setting an- other curvepoint, the so-called inflection point.
Page 162: Influences On The Flow Temperature Setpoint
10.6.3 Influences on the flow temperature setpoint Basis for the flow temperature setpoint is the heating curve. In addition, the setpoint is influenced by the following variables: • Room setpoints • Actual value room temp • Morning boost (refer to subsection 10.8.3 “Quick setback and boost heating”) Influence of the room The basic heating curve applies to a room temperature setpoint of 20 °C.
Page 163: Heating Limit Switch
Settings Main menu > Commissioning > Settings > … or Main menu > Settings > Heating circuit > Optimizations/influences Operating line Range Factory setting Room influence ---- (none) / 0…10 ---- SpTFlDe TOeff SpTFlHi SpTRN TODe TOHi TOeff SpTR SpTR TR ×...
Page 164: Mixing Valve Control
• When all 3 temperatures lie 1 °C below the Economy heating limit, heat will be re- Economy heating limit leased in Economy and Protection mode • When 1 of the 3 temperatures lies above the Economy heating limit, delivery of heat will be locked TOact TOStrDmp.
Page 165: Load Control
10.7.2 Load control The heat output of mixing valve control can be reduced by functions of higher priority (e.g. by return temperature limitation) or by functions of other plant (boiler, DHW heat- ing). This is accomplished via load control. Heat demand Load control Heat Heat...
Page 166: Optimum Start / Stop Control
Room model Based on the outside temperature, the building time constant and the rate of room temperature increase, the room model calculates the room temperature. If no room temperature sensor is connected, the optimization functions can work with this room model. Economy Room model temperature Room temperature setpoint...
Page 167: Quick Setback And Boost Heating
or Protection mode, the room temperature will lie 0.5 K below the Comfort or Precomfort setpoint. ⇒ Optimum stop control is only possible if the type of optimization selected is “with room temperature sensor”. Main menu > Settings > Heating circuit > Optimizations/influences Settings Operating line Range...
Page 168: Limit And Protective Functions
Settings Main menu > Settings > Heating circuit > Optimizations/influences Operating line Range Factory setting [Boost heating] setpoint increase 0…20 K 10.9 Limit and protective functions 10.9.1 Maximum limitation of the room temperature If a room temperature sensor is connected, maximum limitation of the room tempera- ture can be activated.
Page 169: Frost Functions And General Protective Functions
Room lim switching differ- The room switching differential is used to set the temperature differential for switching on the heating circuit. ential 10.9.2 Frost functions and general protective functions It can be selected whether or not frost protection for the plant shall act on the heating Frost protection for the circuit pump.
Page 170: Pump Kick And Valve Kick
10.9.4 Pump kick and valve kick The pump kick is a protective function that is carried out periodically. It prevents pumps and / or actuators from seizing after longer off periods. 10.10 Heat demand The internal heating circuit can be connected directly to the main distributor or after the primary controller (if present).
Page 171 In the event of a flow sensor error, the mixing valve will be driven to the fully closed position to become inactive (in case of a 3-position actuator); it can then be operated manually. Sensor error, return tem- Number Text Effect perature [HC 1] error return...
Page 172: Diagnostic Choices
10.12 Diagnostic choices Inputs/setpoints Main menu > Heating circuit > Inputs/setpoints Operating line Adjustable values / remarks Composite outside temp …°C Attenuated outside temp …°C Actual value flow temp …°C Flow temperature setpoint According to section 10.7 “Mixing valve control” (load control considered) Room sensor temp.
Page 173: Function Block Miscellaneous
Function block miscellaneous 11.1 Function block overview Miscellaneous Time switch Outside temperature sensor Inputs Display input 1 Display input 2 Display input 3 Display input 4 Special day input Holiday input Outside temperature relay Outputs Time switch Functions Business card 11.2 Configuration Function block “Miscellaneous”...
Page 174: Outside Sensor
Functions Main menu > Commissioning > Extra configuration > Miscellaneous Operating line Range Factory setting Time switch Off / On Business card Yes / No Note The special day input and the holiday input are described in section 5.2 “Holidays/special days“. Time switch If there is no heating circuit on the controller, the heating circuit’s time switch can be used for external controllers on the bus.
Page 175: Outside Temperature Simulation
Main menu > Commissioning > Settings > Inputs Operating line Range Factory setting RMK770… (or RMZ78…) Ni1000 / 2×Ni1000 / Ni1000 T1 / Pt1000 / 0…10 V Outside temperature The outside temperature can be transmitted to other controllers via bus or it can be via the bus received by the bus.
Page 176: Display Inputs
Fault status messages Number Text Effect Nonurgent message; must not be acknowledged Outside temp sensor error >1 outside tem- Urgent message; must be acknowledged perature sensor Outs sensor simu- Nonurgent message; must not be acknowledged lation active 11.4 Display inputs On the RMK770, 4 universal inputs can be defined for display purposes.
Page 177: Outside Temperature Relay
Operating line Range Factory setting Display input 4 Like display input 1 For detailed information about the configuration of analog inputs, refer to subsection 3.4.8 “Configuration of the universal inputs and outputs”. 11.5 Outside temperature relay The function is to be activated via the extra configuration: Main menu >...
Page 178: Function Block Faults
Function block faults 12.1 Function block overview The task of function block "Faults" is to collect and evaluate all fault status messages, and to trigger appropriate actions to prevent damage to the building and plant. The function block is always active for internal fault status messages. In the extra con- figuration –...
Page 179: Fault Button
12.3 Fault button Fault status messages delivered to the controller are indicated by the LED in the fault button. If a fault status message needs to be acknowledged, the acknowledgement must also be made via the fault button. There are 3 choices: Indication Cause / procedure Button is not lit...
Page 180: Signal Priority
Example If a plant uses more than 1 time switch master in the same geographical zone, this fault status message must be acknowledged. There is an acknowledgement and a reset required for this type of fault. Acknowledgement and reset (extended fault) If both pumps of the twin pump signal a fault, the fault status message must be ac- Example knowledged and –...
Page 181: State Diagrams Of The Individual Types Of Faults
12.5 State diagrams of the individual types of faults A simple fault need not be acknowledged. If there is a fault relay (see below), it must be Simple fault reset, however. No fault (acknowledged) Fault coming Fault going Faulty (acknowledged) When there is a simple fault, the LED is lit.
Page 182: Predefined Fault Inputs
again only after the fault has been acknowledged, the errors corrected and the fault reset. Aggregate or plant stopped LED lit LED flashes LED off Acknowledge fault No fault, No fault, No fault, not acknowledged, acknowledged acknowledged reset Fault coming Fault coming Fault...
Page 183: Analog Fault Input With Limit Value Supervision
Following can be set for each fault status message: Main menu > Commissioning > Settings > Faults > Fault input… Operating line Range Factory setting Fault text Free text, max. 20 char- Aux 1 acters Fault status signal delay 00.00…59.55 m.s 00.05 m.s None / Acknowledge / None...
Page 184: Communication
Main menu > Commissioning > Settings > Faults > Fault input… Operating line Range Factory setting Limit value fault on 0 / 1* Limit value fault off 0 / 1* * Depends on “Input identifier” If “Limit value fault on“ is greater than “Limit value fault off”, the input is monitored for overshoot.
Page 185: Fault Relay
Setting values Main menu > Commissioning > Communication > Basic settings Operating line Range Factory setting Remote reset of fault No / Yes A controller cannot acknowledge any fault status messages on other controllers. 12.9 Fault relay To pass on the fault status messages or to indicate them optically on a control panel, for example, 2 fault status outputs can be configured.
Page 186: Alarm Indication
12.10 Alarm indication The current state of the fault status messages can be interrogated on the operator unit. Faults current The current faults include all faults currently pending. A maximum of 10 faults can be displayed. Following is displayed with each fault: •...
Page 187: Diagnostic Choices
the contact is closed; when selecting “Normal position closed”, this is the case when the contact is open. Main menu > Commissioning > Wiring test > Faults > Outputs Operating line Remarks Fault relay 1 Off / On Fault relay 2 Off / On 12.13 Diagnostic choices Inputs...
Page 188: Communication
Communication A detailed description of communication is given in Basic Documentation “Communica- tion via Konnex bus” (P3127). In the following, the most important settings required for commissioning a multiboiler plant are described. Communication is activated when the following conditions are satisfied: Activating •...
Page 189: Generation Zone And Boiler Sequence Zone
RM.. RM.. Time of day Time of day Device 1 Device 2 Master Slave Legend for all figures in this chapter: Signal transmitter Signal receiver Remote reset of fault Effects when communication is activated: • Fault status messages are always delivered via bus and can be further handled by other Synco™...
Page 190: Distribution Zones
Controller 2 Controller 1 Controller 3 Controller 4 RMK770 RMK770 RMH760 RMH760 Heat Heat consumer consumer Generation zone Boiler seaquence manager Heat distribution zone Boiler 2 Boiler 1 Boiler 4 Boiler 3 (b.-address 2) (b.-address 1) (b.-address 4) (b.-address 3) The boiler sequence manager is always in the controller with the main flow sensor.
Page 191: Heat Demand And Load Control
13.3.1 Heat demand and load control The heat demand and the load control signals are exchanged via the heat distribution zones. Main menu > Commissioning > Communication > Distribution zones Operating line Range Factory setting Heat distr zone main distributor 1…31 Heat distr zone prim controller 1…31...
Page 192: Setting The Heating Circuit Room Data And The Holidays/Special Days
13.4 Setting the heating circuit room data and the holidays/special days For a detailed description of the following settings, refer to Basic Documentation “Communication via Konnex bus" (P3137). Main menu > Commissioning > Communication > Room-Heating circuit Operating line Range Factory setting Geographical zone (apartment) 1…126...
Page 193 Number Text Effect 6001 >1 identical device More than 1 device with the same device ad- address dress. Urgent message; must be acknowledged >1 boiler with ad- 2 boilers with boiler address 1. 5512 dress number 1 Nonurgent message; must be acknowledged 2 boilers with boiler address 2 5522 >1 boiler with ad-...
Page 194: Fault Tracing Support
14 Fault tracing support If a fault is displayed, it is always practical to select operating line Faults > Faults current and look for any pending fault status messages before starting to rectify faults. If an extension module is faulty, that fault must always be rectified first because it may lead to a number of subsequential fault status messages.
Page 195 Number Name Possible cause, remarks [Boiler 6] boiler Error boiler sensor boiler 6 sensor error [Boiler 1] return Error return sensor boiler 1 sensor error [Boiler 2] return Error return sensor boiler 2 sensor error [Boiler 3] return Error return sensor boiler 3 sensor error [Boiler 4] return Error return sensor boiler 4...
Page 196 Number Name Possible cause, remarks 2305 [B5 burner] no Urgent, must be acknowledged, aggregate stop checkback signal of boiler 5 2306 [B6 burner] no Urgent, must be acknowledged, aggregate stop checkback signal of boiler 6 2311 [B1 burner] no Urgent, must be acknowledged and reset, aggre- checkback signal gate stop of boiler 1 2312...
Page 197 Number Name Possible cause, remarks 2341 [Boiler 1] underpres- Priority, effect and acknowledgement can be sure parameterized (default: urgent, boiler stop, must be acknowledged) 2342 [Boiler 2] underpres- Priority, effect and acknowledgement can be sure parameterized (default: urgent, boiler stop, must be acknowledged) 2343 [Boiler 3] underpres-...
Page 198 Number Name Possible cause, remarks 2393 [Boiler sequence] Can be parameterized underpressure 2396 Main flow temp not Not urgent message, must be acknowledged, no reached plant stop 2401 Not urgent, must be acknowledged and reset, no [B1 pump] overload aggregate stop of boiler 1 2402 Not urgent, must be acknowledged and reset, no [B1 pump B] overload...
Page 199 Number Name Possible cause, remarks 2441 [Boiler 1 pump] fault Urgent, must be acknowledged and reset, aggre- gate stop of boiler 1 [Boiler 2 pump] fault 2442 Urgent, must be acknowledged and reset, aggre- gate stop of boiler 2 [Boiler 3 pump] fault 2443 Urgent, must be acknowledged and reset, aggre- gate stop of boiler 3...
Page 200 Number Name Possible cause, remarks 5003 Invalid time of day Time of day on clock time master must be read- justed. Reserve has elapsed. Nonurgent message; must not be acknowledged 5101 Syst time switch Time switch master is missing or cannot be re- failure plant 1 ceived.
Page 201: Rectification Of Errors
14.2 Rectification of errors Question Reply E.g., error message “[HC 1] Check to see if, in addition, error “Fault extension error flow sensor“ appears al- module“ occurred. This error can lead to the though a sensor is connected. display of subsequential errors. When commissioning the plant, 1.
Page 202: Appendix
Appendix 15.1 Configuration diagrams Use of the configuration diagrams is explained in subsection 3.3.5 “Use of configuration diagrams”. 15.1.1 Terminal markings The designations of the signal inputs and outputs and of the assigned connection ter- minals are structured according to the following pattern: Example Explanation N.X3...
Page 203: Configuration Diagram Basic Type K
15.1.4 Configuration diagram basic type K B o i le r R e t u r n B u r n e r o p e n S h u t o f f v a l v e c l o s e F l u e g a s 0 .
Page 204: Configuration Diagram Plant Type K1.1
15.1.5 Configuration diagram plant type K1.1 Boiler Return Burner open Shutoff valve close Flue gas 0...10 V Flue gas mode Curr burner outp Main flow Setpoint comp. Burner Main return (Water shortage) 1 MBRT return (Overpressure) 2 Consumer return Shutoff valve (Underpressure) 3 open close...
Page 205 Operating line Page 1. Commissioning Basic configuration Plant type Position 1 Position 2 Position 3 Extra configuration Boiler sequence manager Inputs Main flow sensor Main return sensor MBRT return sensor Consumer return sensor Boil sequence selection input 1 Boil sequence selection input 2 Boil sequence selection input 3 Release input Fault input 1...
Page 206 Burner stage 2 Modulating burner 3-pos Modulating burner mod Setpoint compensation Boiler pump Boiler pump B Shutoff valve Maint boiler return temp 3-pos Maint boiler return temp mod Boiler 2 (same as boiler 1) Boiler 3 (same as boiler 1) Boiler 4 (same as boiler 1) Boiler 5 (same as boiler 1) Boiler 6 (same as boiler 1)
Page 207 Miscellaneous Input identifier Display input 1 Display input 2 Display input 3 Display input 4 Inputs Outside sensor Special day input Holiday input Display input 1 Display input 2 Display input 3 Display input 4 Outputs Outside temperature relay Time switch Business card Faults Input identifier...
Page 208 Room heating circuit Geographical zone (apartment) Time switch operation Time switch slave (apartment) Holidays/special day Holidays/special day operation Hol/spec day zone 2. Boiler sequence manager Boiler sequence optg mode Preselection Setp preselection manual Main flow temp actual value State Cause Boil sequence selection manual Boiler order Number of available boilers...
Page 209 Outputs Main pump Main pump B Maint boiler return temp 3-pos Maint boiler return temp mod Limitations MBRT return temp minimum Setpoint maximum limitation 3. Boiler 1 Flue gas measuring mode Preselection Flue gas meas mode contact Release stage 2/modulation Actual value boiler temperature Flue gas temperature Boiler operating mode...
Page 210 Burner stage 2 Modulating burner 3-pos Modulating burner mod Setpoint compensation Boiler pump Boiler pump B Shutoff valve Maint boiler return temp 3-pos Maint boiler return temp mod Limitations Boiler temperature max Boiler temperature min Protective boiler startup Boiler return temperature min Burner run time min 4.
Page 211 Thursday Friday Saturday Sunday Special day 11. Heating circuit Room operating mode Preselection State Cause Room setpoints Comfort cooling setpoint Comfort Precomfort Economy Protection Heating curve [Curvepoint 1] outside temp [Curvepoint 1] flow temp [Curvepoint 2] outside temp [Curvepoint 2] flow temp Radiator exponent Proportion of windows Plant operation...
Page 212 Limitations Flow temperature max Flow temperature min Flow temperature rise Return temperature max Return temperature min 12. Miscellaneous Inputs Actual value outside temp Outside temperature simulation Special day input Holiday input Display input 1 Display input 2 Display input 3 Display input 4 Fault input 1 Fault input 2...
Page 213 Inputs Demand control [Curvepoint 1] outside temp [Curvepoint 1] flow temp [Curvepoint 2] outside temp [Curvepoint 2] flow temp Flow temp correction max Control mode Requisition evaluation Limit value requisition on Limit value requisition off Heat req boiler sequence [Modulating] setpoint at 0 V [Modulating] setpoint at 10 V [Modulating] limit value [2-pos] setpoint normal...
Page 214 Setpoint at 10 Volt Limit value Setpoint comp boiler 4 Setpoint at 0 Volt Setpoint at 10 Volt Limit value Setpoint comp boiler 5 Setpoint at 0 Volt Setpoint at 10 Volt Limit value Setpoint comp boiler 6 Setpoint at 0 Volt Setpoint at 10 Volt Limit value Boiler sequence manager...
Page 215 Lock sig maintained boil ret temp Frost protection for the plant Return control Actuator run time P-band Xp Integral action time Tn Boiler 1 Operation settings Backup boiler Outside temp lock limit value Setpoint boost lag boiler Switch-on delay pump Switch-on delay burner Boil setp individual operation (only at boiler 1!) Boiler shutdown...
Page 216 Boiler output Proportion stage 1 Limitations Boiler temperature max Boiler temperature min Optimization min boiler temp Boiler return temperature min Consumer overrun time Frost prot (release input off) Frost prot boiler pump Protective boiler startup Protective boiler startup Delta boiler temp max (stage 2) Burner modulating Actuator running time P-band Xp...
Page 217 Heating circuit Heating circuit Space heating Comfort heating limit Economy heating limit Building time constant Preselected room optg mode Timer function Optimizations/influences Type of optimization Forward shift on max Early shutdown max Quick setback [Boost heating] setpoint boost Room influence Room temperature rise Twin pump Run priority...
Page 218 Faults Fault input 1 Fault text Fault status signal delay Fault acknowledgement Fault priority Impact of fault Limit value fault on Limit value fault off Fault input 2 Fault text Fault status signal delay Fault acknowledgement Fault priority Impact of fault Limit value fault on Limit value fault off Fault relay 1...
Page 219: Info
15.2 Info pages From the start page (Welcome picture), the Info level (refer to subsection 2.2.3 “Operating levels”) is reached by pressing the INFO button. Here, you find the key plant data listed. No values can be changed here. The Info level comprises several pages.
Page 220 Display values Actual value outside temp Display input 1 Display input 2 Display input 3 Display input 4 Fault inputs Fault input 1 Fault input 2 Fault input 3 Fault input 4 Device state Fault number Fault status signal bus Fault number Device address Service information...
Page 221 Index burner running time ..........107 burner stage 2 control ..........108 2-position control of 1-stage burners ..... 107 burner start counter..........123 2-position control of 2-stage burners ..... 108 burner types ............102 bus power supply decentral........188 business card ............56 access right, access levels ........18 acknowledgement ..........
Page 222 digital inputs .............45 function block heating circuit control...... 145 display examples............17 function block miscellaneous ......... 173 display inputs..........43, 173, 176 function block primary controller ......135 disposal ..............14 function blocks............32 distribution zones ...........190 documentation............13 general functions ............. 58 generation zone............. 189 economy heating limit..........163 geographical zone ...........
Page 223 locking a boiler ............105 output balance............87 locking logic burner stage 2 ........109 outside sensor ..........43, 174 locking signals............66 outside temperature ..........158 outside temperature communication ......191 outside temperature lock........105 main flow temperature sensor....19, 38, 76, 90 outside temperature relay ........177 main pump ...............
Page 224 return temperature limitation primary controller..137 synchronization pulse ..........70 return temperature sensor heating circuit....149 room control combination ........152 temperature units............. 55 room frost protection for the room, heating temperature-time integral ........86, 87 circuit ..............169 terminal assignment ..........31 room model ............165 terminal assignment outputs........
Page 225 225/226 Building Technologies Boiler Sequence Controller RMK770 CE1P3132en HVAC Products 01.03.2005...
Page 226 Siemens Switzerland Ltd © 2005 Siemens Switzerland Ltd Building Technologies Group Subject to alteration HVAC Products Gubelstrasse 22 CH -6301 Zug Tel. +41 41 724 724 24 24 Fax +41 41 724 724 35 22 www.sbt.siemens.com 226/226 Building Technologies Boiler Sequence Controller RMK770...

Siemens Synco700 RMK770 Documentation Handbook

1 Summary

2 Operation

3 Commissioning

4 General Settings

5 General Functions, Fundamentals

6 Boiler Sequence Management

7 Boiler Temperature Control

8 Heat Demand and Heat Requisitions

9 Precontrol

10 Heating Circuit Control

11 Function Block Miscellaneous

12 Function Block Faults

13 Communication

14 Fault Tracing Support

15 Appendix

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Summary of Contents for Siemens Synco700 RMK770