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®
TRADELINE
T8090A Heating, Cooling,
and Heating-Cooling Thermostat,
Wallplate and Subbase
Assure power is off to the heating, cooling, or heating/
Preparation
cooling system at the main fuse panel. Most buildings have
a separate switch box or circuit breaker for disconnecting
Check thermostat and subbase (if used) suitability for
power to the heating and cooling (if applicable) equipment.
the heating, cooling, or heating/cooling system. Refer to
This thermostat is compatible with all heating, c
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UNPACK THERMOSTAT Handle your new thermostat carefully; rough handling M3375 Recycling Notice may interfere with its accuracy. Before unpacking, refer to Fig. 1. This control contains mercury in a sealed tube. Do not Remove and discard the shipping wrap. place control in the trash at the end of its useful life. If this control is replacing a control that contains mer- IMPORTANT: Save package of screws and instructions cury in a sealed tube, do not place your old control in the for the homeowner.
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Fig. 2—Mounting wallplate or subbase to wall. 3 SCREW HOLES WITH PLASTIC ANCHORS 3 SCREW HOLES WITH PLASTIC ANCHORS HEATING-ONLY WALLPLATE O B R W G Y FAN COOL ON AUTO HEAT OFF HEATING/COOLING SUBBASE M857 M1552A Fig. 3—Leveling methods for wallplate or subbase. SPIRIT LEVEL PLUMB LINE O B R W G Y PLUMB BOB OR FAN COOL ON AUTO HEAT OFF WEIGHT M1555 Fig. 4—Mounting wallplate or subbase on horizontal outlet box. EXISTING EXISTING HORIZONTAL HORIZONTAL OUTLET BOX OUTLET BOX O B R R W W HEATING/
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6 7 8 9 10 11 12 WIRING Follow the instructions provided by the heating, cooling Fig. 6—Thermostat mounting. or heating-cooling equipment manufacturer. If not avail- able, refer to the Typical Wiring Diagrams section. Disconnect power supply before making wiring connec- tions to prevent electrical shock or equipment damage. TAB (2) NOTE: All wiring must comply with local electrical codes and ordinances. MOUNTING SLOT (2) This thermostat clock can be powered by 24 Vac trans- former with battery b
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0.2 AMP 30 VAC T T F F SET CLOCK Adjust the heat anticipator lever to match the current Adjust the clock by moving the minute hand in a clock- rating of the primary control for the proper cycle rate wise direction. Do not reverse the minute hand. (Fig. 9). Set adjustable anticipation for total current of heat When time is correctly set, the time indicator arrow and fan control. (Fig. 8) must point to the correct time and the corresponding Locate the current rating stamped on the control or valv
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12 50 60 70 80 3 9 6 Remove the thermostat from the wallplate or subbase. SET SUBBASE SWITCHES (IF APPLICABLE) Connect an ac ammeter of appropriate range (about 0A to The subbase system switch controls system operation as 2A) between the R and W terminals on the wallplate or follows: subbase except for electric heat and heat pump systems. HEAT: Heating system is controlled by the thermostat. Let the system operate for one minute. Cooling system is off. Adjust the heat anticipator lever to match
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If thermostat fails any test, refer to the Troubleshooting 5. If the readings are different, insert a small screwdriver Guide in the Owner’s Manual. in the thermometer and turn it until the thermometers have Reset both temperature setting levers to the desired the same reading. See Fig. 13. temperatures. 6. Replace the thermostat cover and put the system into operation. HEATING/COOLING SYSTEM Turn on power to the furnace and cooling system. NOTE: Radiant heat from your hands will offset the ther
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Fig. 14—Use of 104994A calibration wrench. Fig. 17—Typical hookup for clock powered by system transformer. Clock powered by battery when system is not powered (e.g., power to system is off or interrupted). CALIBRATION WRENCH CLOCK 2 ANTICIPATOR BATTERY SETTING THERMOSTAT LEVER ANTICIPATOR SCALEPLATE M8583 SUBBASE C C R W HEAT L1 RELAY (HOT) 1 Typical Wiring Diagrams L2 POWER SUPPLY. PROVIDE DISCONNECT MEANS 1 AND OVERLOAD PROTECTION AS REQUIRED. M1513A Fig. 15—Typical hookup for clock power
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Fig. 19—Typical hookup for clock powered through control system. Clock powered by battery when heating or cooling equipment is on; clock takes power from system when cooling equipment is off. THERMOSTAT CLOCK BATTERY 3 CC RH RC WY 2 SUBBASE HEAT L1 RELAY (HOT) 1 L2 COMPRESSOR L1 CONTACTOR (HOT) 1 L2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 JUMPER RH-RC TERMINALS WHEN ONE TRANSFORMER POWERS BOTH HEATING AND COOLING. 3 FOR POWER STEALING ON HEATING, JUMP
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Automation and Control Solutions Honeywell International Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-0750—1 10
