hit counter script
Honeywell 7800 Series Manual
  1. Manuals
  2. Brands
  3. Honeywell Manuals
  4. Control Unit
  5. 7800 SERIES
  6. Manual

Honeywell 7800 Series Manual

Relay module
Hide thumbs Also See for 7800 Series:
Table of Contents

Advertisement

Quick Links

7800 SERIES RM7840E,G,L,M
The Honeywell RM7840 is a microprocessor
based integrated burner control for automatically
fired gas, oil, or combination fuel single burner ap-
plications. The RM7840 consists of a Relay Module.
Subbase, Amplifier and Purge Card are required to
complete the system. Options include Keyboard Dis-
play Module, Personal Computer Interface, DATA
CONTROLBUS MODULE
Mounting, First-Out Expanded Annunciator and
COMBUSTION SYSTEM MANAGER
The RM7840 is programmed to provide a level of
safety, functional capability and features beyond the
capacity of conventional controls.
Functions provided by the RM7840 include auto-
matic burner sequencing, flame supervision, system
status indication, system or self-diagnostics and
troubleshooting.
Safety features:
-Interlock check.
-Closed loop logic test.
-Dynamic AMPLI-CHECK™.
-Dynamic input check.
-Dynamic safety relay test.
-Dynamic self-check logic.
-Expanded safe-start check.
-High Fire Purge Switch test.
-Internal hardware status monitoring.
-Low Fire Start Switch test.
-Tamper resistant timing and logic.
Access for external electrical voltage checks.
Application flexibility.
Communication interface capability.
Dependable, long-term operation provided by microcom-
puter technology .
First-out annunciation and system diagnostics are pro-
vided by an optional 2 row by 20 column Vacuum Fluores-
cent Display (VFD) located on the Keyboard Display
Module (optional).
First-out expanded annunciation with 26 Light Emitting
Diodes (LEDs) for limits and interlocks (optional).
Five LEDs for sequence information.
Five function Run/Test Switch.
Interchangeable plug-in flame amplifiers.
Local or remote annunciation of RM7840 operation and
fault information.
Nonvolatile memory RM7840 retains history files and
sequencing status after loss of power.
Remote reset (optional).
Report generation (optional).
Burner controller data (optional):
-Expanded annunciator status.
-Flame signal strength.
-Hold status.
-Lockout/alarm status.
™
, Remote Display
™
software.
S. H. • Rev. 9-92 • ©Honeywell Inc. 1992 • Form Number 65-0087-2
Relay Module
-Sequence status.
-Sequence time.
-Total cycles of operation.
-Total hours of operation.
-Fault history, providing for the six most recent
faults:
• Cycles of operation at the time of the fault.
• Expanded annunciator data at the time of the fault.
• Fault message and code.
• Hours of operation at the time of the fault.
• Sequence status at the time of the fault.
• Sequence time at the time of the fault.
-Diagnostic information:
• Device type.
• Flame amplifier type.
• Flame failure response time.
• Manufacturing code.
• On/Off status of all digital inputs and outputs.
• Selected prepurge time.
• Software revision and version of RM7840 and
optional Keyboard Display Module.
• Status of configuration jumpers.
• Status of Run/Test Switch.
CONTENTS
Specifications ................................................ 2
Ordering Information .................................... 2
Principle Technical Features ........................ 7
Safety Provisions ........................................... 8
Installation .................................................... 9
Wiring .......................................................... 11
Assembly ...................................................... 15
Operation .................................................... 18
Static Checkout ............................................ 22
Checkout ...................................................... 24
Troubleshooting .......................................... 32

Advertisement

Table of Contents
loading

Related Manuals for Honeywell 7800 Series

Summary of Contents for Honeywell 7800 Series

  • Page 1: Table Of Contents

    Burner controller data (optional): Assembly ............15 —Expanded annunciator status. Operation ............ 18 —Flame signal strength. Static Checkout ..........22 —Hold status. Checkout ............24 —Lockout/alarm status. Troubleshooting .......... 32 S. H. • Rev. 9-92 • ©Honeywell Inc. 1992 • Form Number 65-0087—2...

  • Page 2: Specifications

    Operating frequency chosen by RM7840 selection. Ordering Information When purchasing replacement and modernization products from your 7800 SERIES distributor, refer to the TRADELINE® Catalog for complete ordering number. If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1.
  • Page 3 Circuitry tests the flame signal amplifier at least 12 times a minute during burner operation and shuts down the burner if the amplifier fails. Order flame rod separately; see holder Instructions. Use only Honeywell Photocell, part no. 38316. 65-0087—2...
  • Page 4 RM7840E,G,L,M SPECIFICATION SEQUENCE TIMING FOR NORMAL OPERATION Post Firing Energy Approval Flame Establishing Period Purge Interlock Rate Saving Code Device Initiate Standby Purge Pilot Main Timing Circuits Circuit Prepurge Bodies RM7840E 10 sec. 4 or 10 sec. 10 or 15 sec. 15 sec.
  • Page 5 RM7840E,G,L,M SPECIFICATIONS Fig. 2—Mounting dimensions of RM7840 Relay Module and Q7800B Subbase, in inches [millimeters]. BURNER CONTROL [127] POWER PILOT FLAME MAIN ALARM RESET [155] 5 [127] REMOVE ONLY FOR TERMINAL TEST ACCESS. M5004A Fig. 3—Rectification detectors. IGNITION ELECTRODE FLAME ROD (Q179C ONLY) CERAMIC INSULATORS...
  • Page 6 RM7840E,G,L,M SPECIFICATIONS Fig. 4—Ultraviolet detectors. [105] COLLAR WITH 2 [51] 1/2-14 NPSM 4 [102] 6 FOOT [1.83 METER] INTERNAL THREADS 1–11-1/2 NPSM LEADWIRES (2) INTERNAL [89] THREADS [30] [27] [25] [38] 6 FOOT COLLAR WITH 1/2-14 NPSM [67] [1.83 METER] INTERNAL THREADS INSERTION DEPTH LEADWIRES (2) 3...

  • Page 7: Principle Technical Features

    RM7840E,G,L,M PRINCIPAL TECHNICAL FEATURES Principal Technical Features The RM7840 provides all customary flame safeguard i. Main valve terminal is energized. functions while supplying significant advancements in j. Internal system fault occurred. the areas of safety, annunciation and system diagnostics. k. Purge card is removed. l.

  • Page 8: Safety Provisions

    RM7840E,G,L,M SAFETY PROVISIONS Safety Provisions INTERNAL HARDWARE STATUS MONITORING a flame signal check during STANDBY, a preignition inter- The RM7840 checks the purge card for correct parity to lock check, an interlock check, and a safety critical load prevent purge timing shifts and circuitry failures. It also check.
  • Page 9 RM7840 or Plug-in Purge Card, are isolated not begin until the blower motor is recognized. and reported by the optional Keyboard Display Mod- ule, see the 7800 SERIES System Annunciation Diag- nostics and Troubleshooting, form 65-0118. Preignition Interlock (RM7840 ALL)

  • Page 10: Installation

    RM7840E,G,L,M INSTALLATION Installation WHEN INSTALLING THIS PRODUCT… WARNING 1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous FIRE OR EXPLOSION HAZARD condition. CAN CAUSE PROPERTY DAMAGE, 2. Check the ratings given in the instructions and marked SERVERE INJURY, OR DEATH on the product to make sure the product is suitable for your To prevent possible hazardous burner operation,...

  • Page 11: Wiring

    RM7840E,G,L,M INSTALLATION • WIRING 4. This digital apparatus does not exceed the Class B CAUTION limits for radio noise of digital apparatus set out in the Radio Interference Regulations of the Canadian De- 1. Disconnect the power supply before beginning partment of Communications.
  • Page 12 RM7840E,G,L,M WIRING 5. Recommended grounding practices: Be careful to ensure that mechanically tightened a. Use the earth ground to provide a connection joints along the ground path, such as pipe or between the subbase and the control panel or the conduit threads or surfaces held together with equipment.
  • Page 13 RM7840E,G,L,M WIRING 1. Do not run high voltage ignition transformer b. For flame detector leadwires, the maximum flame wires in the same conduit with the flame detec- sensor leadwire length is limited by the flame signal tion wiring. strength. 2. Do not route scanner wires in conduit with line 8.
  • Page 14 RM7840E,G,L,M WIRING Fig. 9—Wiring RM7840L. SERIES 90 FIRING RATE SERIES 90 MOTOR Q7800 CONTROLLER HIGH FIRE COMMON LOW FIRE 120V ALARM MODULATE BURNER MOTOR (BLOWER) BURNER CONTROLLER/LIMITS LOCKOUT INTERLOCKS LOW FIRE (INC. AIR FLOW SWITCH) START SWITCH 10 SEC. INTERRUPTED HIGH FIRE PILOT/IGNITION PURGE SWITCH...

  • Page 15: Assembly

    RM7840E,G,L,M WIRING • ASSEMBLY Fig. 10—Wiring RM7840M. Q7800 COMMON 120V ALARM DAMPER MODULATE MOTOR BURNER MOTOR (BLOWER) BURNER CONTROLLER/LIMITS RUNNING INTERLOCKS LOW FIRE (INC. AIR FLOW SWITCH) START SWITCH 10 SEC. INTERRUPTED PILOT/IGNITION MAIN FUEL PREIGNITION VALVE(S) INTERLOCK 5 SECOND IGNITION INTERMITTENT (EARLY SPARK PILOT...
  • Page 16 RM7840E,G,L,M ASSEMBLY 3. Make sure no subbase wiring is projecting beyond the 3. Make sure the ST7800 selected has the desired timing. terminal blocks. Tuck wiring in against the back of the 4. Insert the Purge Card into the opening of the RM7840 subbase so it does not interfere with the knife blade terminals compartment, see Fig.
  • Page 17 SENSOR WHITE EARTH GROUND BROWN SHUTTER C7076A SHUTTER C7076D TERMINAL BLOCK ULTRAVIOLET (C7027/C7035/C7044) L1 (HOT) L2 (COMMON) BLUE 7800 SERIES WHITE SOLID STATE SELF-CHECKING SOLID STATE ULTRAVIOLET (C7012E,F) ULTRAVIOLET (C7012A,C) BLUE BLUE YELLOW YELLOW WHITE WHITE BLACK BLACK BLACK BLACK...

  • Page 18: Operation

    RM7840E,G,L,M OPERATION Operation Sequence of Operation d. The Lockout Interlock or Running Interlock inputs The RM7840 has the following operating sequences, see (interlock circuit including Airflow Switch) must close Figs. 17, 18 , 19 and 20. by ten seconds or within specified purge card timing into PREPURGE;...
  • Page 19 RM7840E,G,L,M OPERATION motor output is powered to drive all combustion products 1. A ten second stabilization period occurs at the and any unburned fuel from the combustion chamber. It beginning of the RUN period. also supplies combustion air to burn fuel being purged 2.
  • Page 20 RM7840E,G,L,M OPERATION Fig. 18—RM7840G sequence. RM7840G PFEP TIMED PURGE 4 OR 10 SEC INITIATE STANDBY PREPURGE MFEP POSTPURGE STANDBY POWER POWER POWER POWER POWER POWER POWER POWER POWER PILOT PILOT PILOT PILOT DISPLAY FLAME FLAME FLAME FLAME MAIN MAIN MAIN MAIN ALARM ALARM...
  • Page 21 RM7840E,G,L,M OPERATION Fig. 20—LED sequence status display information. BURNER SEQUENCE: STANDBY PURGE RUN (WITH RESET/ RUN WITH HOLD: F/G HOLD: F/G INTERRUP- MAIN ALARM (FLAME (FLAME PILOT (INTERMIT- TED PILOT) DETECTED) DETECTED) PURGE IGNITION IGNITION TEST INITIATE STANDBY TENT PILOT) POSTPURGE STANDBY POWER POWER...

  • Page 22: Static Checkout

    RM7840E,G,L,M OPERATION • STATIC CHECKOUT SERVICE NOTE: Clipping and removing a site- configurable jumper enhances the level of safety. Fig. 22—Selectable site-configurable jumpers. SELECTABLE CONFIGURATION JUMPERS RUN/TEST SWITCH M7398 Static Checkout 2. Two jumper wires; no. 14 wire, insulated, 12 inches CAUTION (304.8 mm) long, with insulated alligator clips at both ends.
  • Page 23 RM7840E,G,L,M STATIC CHECKOUT TABLE 4—STATIC CHECKOUT. Test RM7840 Test Volt- If Operation Is Abnormal, Models Jumpers meter Normal Operation Check The Items Listed Below WARNING Make sure all manual fuel shutoff valves are closed. IMPORTANT: Low fuel pressure limits, if used, could be open. Bypass them with jumpers for the remaining Static Tests (if required).

  • Page 24: Checkout

    RM7840E,G,L,M STATIC CHECKOUT • CHECKOUT TABLE 4—STATIC CHECKOUT (Continued) Test RM7840 Test Volt- If Operation Is Abnormal, Models Jumpers Meter Normal Operation Check The Items Listed Below WARNING Make sure all manual fuel shutoff valves are closed. RM7840 19-L2 Firing rate motor drives closed; zero 1.
  • Page 25 Make certain that: If an RM7840 is replaced with a lower functioning 1. Wiring connections are correct and all terminal screws 7800 SERIES Relay Module, the burner will not are tight. sequence unless wiring changes are made. 2. Flame detector(s) is clean, installed and positioned properly.
  • Page 26 RM7840E,G,L,M CHECKOUT TABLE 5—FLAME SIGNAL. Minimum Acceptable Maximum Flame Flame Signal Steady dc Expected Detector Amplifier Voltage dc Voltage Flame Rod R7847A,B 1.25 Vdc 5.0 Vdc at Keyboard Photocell C7012A,C Display Module C7012E,F R7847C C7015A R7848A,B C7027A R7849A,B C7035A 5.0 Vdc at a C7044A 20 kohm/volt meter C7076A,D...
  • Page 27 RM7840E,G,L,M CHECKOUT program sequence should start the ten second INITIATE 11. Recycle the system to recheck the lightoff and pilot sequence. flame signal. 4. Let the sequence advance through PREPURGE. Igni- 12. Smoothly open the manual fuel shutoff valve(s) and try tion spark should occur and the pilot should light.
  • Page 28 RM7840E,G,L,M CHECKOUT NOTE: Low fuel pressure limits, if used, could be open. If so, to open. Observe that the second stage lights off bypass them with jumpers during this check. properly. d. Make burner adjustments for flame stability and 1. Open the master switch. input rating.
  • Page 29 RM7840E,G,L,M CHECKOUT IMPORTANT: You have eight seconds or three seconds, Ignition interference can subtract from (decrease) or add depending on PFEP selected, to position the Run/Test to (increase) the flame signal. If it decreases the flame signal Switch in the TEST position to stop the sequence after enough, it will cause a safety shutdown.
  • Page 30 RM7840E,G,L,M CHECKOUT tory is steady, but radiation from a flame has a flickering NOTE: The Honeywell Q624A Solid State Spark Generator characteristic. The infrared detection system responds only will prevent detection of ignition spark when properly to flickering infrared radiation; it can reject a steady signal applied with the C7027, C7035 or C7044 Minipeeper from hot refractory.
  • Page 31 RM7840E,G,L,M CHECKOUT a. Simulate a flame to cause the flame signal voltage 6. Loss of flame during RUN. level to be at least 1.25 Vdc for 40 seconds after a. Open the main fuel manual shutoff valve(s) and entry to STANDBY and also simulate a flame open the manual pilot shutoff valve(s).

  • Page 32: Troubleshooting

    ALARM LED, by using the optional occurred, the fault message and burner status when the fault Keyboard Display Module or 7800 SERIES System Annun- occurred, see S7800A1001 Keyboard Display Module Speci- ciation Diagnostics and Troubleshooting, form 65-0118.
  • Page 33 RM7840E,G,L,M TROUBLESHOOTING TABLE 6—SEQUENCE AND STATUS HOLD MESSAGES. NOTE: Normal sequences are in bold type, while abnormal sequences are not in bold type. Sequence Status INITIATE The LED indicates the burner status, POWER, which is a stabilization period for the RM7840 to check for any fluctua- tions in AC line voltage inputs or control input on power up or during normal operation.
  • Page 34 RM7840E,G,L,M TROUBLESHOOTING TABLE 6—SEQUENCE AND STATUS HOLD MESSAGES (Continued) Sequence Status STANDBY HOLD: T7 (Running Interlock) The LED indicates the burner status, POWER, and that the Running Interlock is closed. If a demand is present for burner operation, the burner sequence will not advance to PREPURGE until the Running Interlock proves open.
  • Page 35 RM7840E,G,L,M TROUBLESHOOTING TABLE 6—SEQUENCE AND STATUS HOLD MESSAGES (Continued) Sequence Status PILOT IGN The LEDs indicate the burner status, POWER, PILOT and FLAME, which is the period of time the RM7840 permits the pilot valve to be open and the pilot flame to be established. If the RM7840 is in a PILOT HOLD status, the following condition could exist: PILOT HOLD: TEST (Run/Test Switch) The LEDs indicate the burner status, POWER, PILOT and...
  • Page 36 Home and Building Control Home and Building Control Helping You Control Your World Honeywell Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, Minnesota 55422 Scarborough, Ontario M1P 2V9 QUALITY IS Printed in U.S.A.

This manual is also suitable for:

Rm7840eRm7840gRm7840lRm7840m

Table of Contents

Save PDF