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APPLICATION
The T8112C,D thermostats provide electronic
programmable control for 24 to 30 Vac heating and
cooling systems.
RECYCLING NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
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
them could 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 installation is complete, check out product
operation as provided in these instructions.
CAUTION
1. Disconnect power supply to prevent electrical
shock or equipment damage.
2. After wiring is complete, push excess wire
back into the hole and plug hole with
nonhardening caulk, putty or insulation to
prevent drafts from affecting thermostat
operation.
®U.S. Registered Trademark
Copyright © 1998 Honeywell Inc. •
T8112C,D Electronic
Programmable Thermostats
• All Rights Reserved
INSTALLATION INSTRUCTIONS
Location
Install the thermostat about 5 ft. (1.5m) above the floor in
an area with good air circulation at average temperature.
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.
Mounting Plate Installation
Position mounting plate on the wall. Use a level to make
sure mounting plate is level. Use a pencil to mark the two
mounting holes. See Fig. 1.
WALL ANCHORS (2)
WIRES THROUGH
WALL OPENING
WALL
Fig. 1. Mounting plate installation.
X-XX UL
MOUNTING
PLATE
MOUNTING
M1718
SCREWS (2)
69-0917-2
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Table of Contents
Related Manuals for Honeywell D
Summary of Contents for Honeywell D
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Page 1: Programmable Thermostats
APPLICATION The T8112C,D thermostats provide electronic programmable control for 24 to 30 Vac heating and cooling systems. RECYCLING NOTICE If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. -
Page 2: Adjust Fan Operation Switch, As Required
T8112C,D ELECTRONIC PROGRAMMABLE THERMOSTATS 1. Remove mounting plate from the wall, and drill 3/16 inch holes in wall (if drywall) as marked. For firmer material such as plaster or wood, drill 7/32 inch holes. Gently tap anchors (provided) into drilled holes until flush with the wall. - Page 3 RELAY POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Fig. 5. Typical hookup in four wire heat and cool (jumper intact) application. T8112C,D ELECTRONIC PROGRAMMABLE THERMOSTATS 5-WIRE HEAT/COOL (JUMPER REMOVED) JUMPER M1709B (HOT) and cool (jumper removed) application.
- Page 4 T8112C,D ELECTRONIC PROGRAMMABLE THERMOSTATS INSERT STRAIGHT 5/16 in. UNDER (8 mm) SCREW HEAD STRIP END OF WIRE VISIBLE HERE Fig. 8. Proper wiring technique. Fig. 9. Holding thermostat while installing. Mounting Thermostat on Mounting Plate 1. Engage tabs at the top of thermostat and mounting plate.
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Page 5: Installing Batteries
Energizer batteries are recommended. 2. Make sure the thermostat is set in the OFF position. 3. Use a coin to remove the battery door. See Fig. 11. 4. Install the new batteries making sure positive and negative terminals are oriented correctly. - Page 6 T8112C,D ELECTRONIC PROGRAMMABLE THERMOSTATS CHECKOUT Heating Do not check heating system operation by jumpering thermostat terminals at the primary control such as the gas valve, zone valve, or oil burner control This will damage the thermostat. Instead, you could jumper R and R wires at the thermostat.
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Page 7: Troubleshooting Guide
PM indications are correct. Make sure the current day and time are correct. Reprogram if necessary. • Check that switch on thermostat is set to HEAT. Allow a minimum of five minutes for time guard protection to expire. • Check the system fuse or circuit breaker and replace or reset if necessary. - Page 8 T8112C,D ELECTRONIC PROGRAMMABLE THERMOSTATS Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneapolis, MN 55408-0524 69-0917—2 69-0917—2 G.H. Rev. 4-98 Printed in Mexico Home and Building Control Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 3N7 www.honeywell.com...