Table of Contents
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APPLICATION
The T8524C, D Multistage Microelectronic Thermostat provides electronic control of 24 Vac two-stage heating and two-
stage cooling systems. Refer to Table 1 for a general description of the thermostat. All T8524 Thermostats require a
common wire to supply power.
T8524
System
Changeover
C
Heat-Cool
D
Heat-Cool
Automatic
RECYCLING NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do
control in the trash.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of the old thermostat.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
the instructions can damage the product or cause a
hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After completing installation, use these instructions
to check out the product operation.
®U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. •
Microelectronic Thermostats
Table 1. Description of T8524 Thermostats.
System
Selection
Manual
Heat-Off-Cool
Heat-Off-Cool-Auto
not
place your old
• All Rights Reserved
T8524C,D Multistage
INSTALLATION INSTRUCTIONS
Fan
Selection
On-Auto
System and fan selections are done by
switches.
On-Auto
System and fan selections are done by
keyboard.
CAUTION
Disconnect power supply to prevent electrical
shock or equipment damage.
Location
Install the thermostat about 5 ft (1.5m) above the floor in
an area with good air circulation at average temperature.
See Fig. 1.
Do not install the thermostat where it can be affected by:
— drafts, or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.
Wallplate Installation
The thermostat can be mounted horizontally on the wall or
on a 2 in. x 4 in. wiring box. Position wallplate horizontally
on the wall or on a 2 in. x 4 in. wiring box.
1. Position and level the wallplate (for appearance
only). The thermostat will function properly even
when not level.
X-XX UL
Comments
69-1055-1
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Table of Contents
Related Manuals for Honeywell DMULTISTAGE T8524C
Summary of Contents for Honeywell DMULTISTAGE T8524C
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Page 1: Wallplate Installation
The T8524C, D Multistage Microelectronic Thermostat provides electronic control of 24 Vac two-stage heating and two- stage cooling systems. Refer to Table 1 for a general description of the thermostat. All T8524 Thermostats require a common wire to supply power. - Page 2 IMPORTANT M6530 2. Securely tighten each terminal screw. 3. Push excess wire back into the hole. 4. Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat. M10106 Use 18 gauge, color-coded thermostat cable for proper wiring.
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Page 3: Mounting Thermostat
SENSOR HEAT RELAY (HOT) HEATING TRANSFORMER M11309 NOTE: To remove the thermostat from the wall, first pull out Fig. 6. Thermostat key locations and descriptions. M4826 SETTINGS System and Fan Settings System settings control the thermostat operation as follows: Heat: The thermostat controls the heating. -
Page 4: Temperature Settings
Table 2 and if no changes are necessary, go to the Installer System Test section. The Installer Setup is used to customize the thermostat to specific systems. Installer Setup Numbers are listed in Table 2. The table includes all the configuration options available. - Page 5 Minimum off time for the compressor Available on select models. Installer Setup Number 02 must be set to 01 to extend fan operation. T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS Table 2. Thermostat Installer Setup Options. Factory-Setting Display Description — — Conventional applica-...
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Page 6: Installer System Test
Review the settings to confirm that they match the system. INSTALLER SYSTEM TEST Use the Installer System Test to check the thermostat configurations and operation. Refer to Table 3 for a list of the available system tests. To start the system test:: NOTE: The minimum off time for compressors is bypassed during the Installer System Test. -
Page 7: Thermostat Information
FAN KEY SYSTEM TEST (T8524D only) Fan on Test Number is displayed. Fan off Test Number is displayed. System fan is energized only if set for electric heat. Thermostat Information 1. Press the Information i key to access the thermostat information. T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS Table 4. -
Page 8: Troubleshooting Guide
— check if the system fuse is blown—replace the fuse. — check if the power switch on the HVAC equipment is in the Off position—set to the On position. — check wiring between thermostat and HVAC equipment—replace any broken wires and tighten any loose connections. - Page 9 Verify operation of heating equipment in system test. Enter Installer Setup mode number 24 and set to 01. Thermostat must have OT terminals and a C7089B1000 installed. Refer to C7089B1000 installation instructions and check wiring between the thermostat and sensor.
- Page 10 T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS 69-1055—1...
- Page 11 T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS 69-1055-1...
- Page 12 T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneapolis, MN 55408-0524 69-1055—1 69-1055—1 J.H. Rev. 6-97 Home and Building Control Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 3N7 www.honeywell.com/yourhome...