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PRODUCT DATA

60-2222-3

® U.S. Registered Trademark
Copyright © 2002 Honeywell •  All Rights Reserved 

T87F Thermostats

APPLICATION

T87F Thermostats provide temperature control for residential 

heating, cooling, or heating-cooling systems. The T87F is 

designed with a dustproof spdt mercury switch, an adjustable 

heat anticipator and a concealed wallplate for 2-wire heating 

hookups. The Tradeline® T87F wallplate is designed for 2-

wire heating or cooling, 3-wire spdt heating (series 20), or 3-

wire spdt heating-cooling with remote switching. The wallplate 

also provides cooling anticipation.

The Q539 Subbase may be added for system and fan 

switching. The Q539 Subbase also provides cooling 

anticipation.

FEATURES

• For 24 Vac to 30 Vac control of heating or cooling 

systems.

• Thermostat cover ring may be painted to match room 

decor.

• Knurled dial provides easy setpoint adjustment.
• Separate temperature setting and thermometer scale 

located on face of thermostat.

• T87F distinctive style makes an attractive addition to 

almost any decor.

• Enhanced setpoint visibility model available for the 

visually impaired.

T87F Easy-to-

See™ Round 

Model

T87F Designer

        Model

T87F Standard

        Model

  

Contents

Application.........................................................................1

Features ............................................................................1

Specifications ....................................................................2

Ordering Information .........................................................2

Installation .........................................................................3

Wiring ................................................................................4

Settings and Checkout ......................................................7

Operation...........................................................................8

Recalibration .....................................................................8

Summary of Contents for T87F Series

Page 1: ...es cooling anticipation The Q539 Subbase may be added for system and fan switching The Q539 Subbase also provides cooling anticipation FEATURES For 24 Vac to 30 Vac control of heating or cooling systems Thermostat cover ring may be painted to match room decor Knurled dial provides easy setpoint adjustment Separate temperature setting and thermometer scale located on face of thermostat T87F distinc...

Page 2: ...wire spst heating or cooling 3 wire spdt heating cooling or 3 wire spdt series 20 heating systems Additional Tradeline Features Cover ring included for covering old thermostat marks or for mounting T87F on outlet box 137421 Wallplate extends beyond thermostat for trim appear ance 198170A Wallplate for Designer Models Tradeline pack with cross reference label and special instruction sheet Standard ...

Page 3: ...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 techni cian 4 After installation is complete check out product opera tion as provided in these instructions Location Locate the thermostat about 5 ft 1 5m above the floor in an area with good air circulation at average temperat...

Page 4: ...ms represent typical applications SPIRIT LEVEL LEVELING POSTS 2 MOUNTING SLOTS SPIRIT LEVEL 104456B WALLPLATE 137421A B D WALLPLATE MOUNTING SLOTS BE SURE WALL HOLE IS PLUGGED MOUNTING SLOTS TERMINAL SCREWS M20772 OPENING FOR THERMOSTAT WIRING T87F THERMOSTAT COVER RING M20773 THERMOSTAT COVER RING MOUNTING SLOTS 4 THERMOSTAT CABLE OPENING 104456B WALLPLATE OUTLET BOX 127293 COVER RING Q539 SUBBAS...

Page 5: ...E COOLING ANTICIPATOR TO SYSTEM CONNECTIONS COOLING ONLY THERMOSTAT MODEL WITH POSITIVE OFF SWITCH OPENS THE THERMOSTAT CIRCUIT WHEN SETPOINT DIAL IS MOVED TO THE OFF POSITION MAKE SYSTEM WIRING CONNECTIONS TO TERMINALS ON 137421D WALLPLATE R1 W1 TERMINALS ON THERMOSTAT ARE DIRECTLY CONNECTED TO R Y TERMINALS ON WALLPLATE WHEN THERMOSTAT IS MOUNTED ON WALLPLATE M20775 TEMPERATURE FALL ADJUSTABLE H...

Page 6: ...ust be used A three wire open contact high limit control requires a jumper as shown in Fig 12 Fig 11 T87F replacing a series 10 thermostat connected to a 2 or 3 wire low limit control L2 COMBINATION FAN AND LIMIT CONTROL FAN MOTOR BURNER MOTOR THERMOSTAT Y R W CAD CELL 1 2 3 R8184G WHITE ORANGE BLACK IGNITION OIL VALVE POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED R8184...

Page 7: ...Adjustment The thermostat has an adjustable heat anticipator that must be set on the number that corresponds to the current rating of the primary control of the system for example gas valve oil primary Fig 14 T87F interior detail Fig 15 Adjust heat anticipator to match current rating of primary control Series 20 Thermostat T87F Thermostat R R B W W Y LOW LIMIT OPERATING CONTROL T87F SERIES 10 OPEN...

Page 8: ...tting until the cooling equipment starts 6 Raise the setting above the room temperature and the cooling system should shut down 7 Make certain that the equipment functions properly in response to the thermostat RECALIBRATION IMPORTANT If the thermostat scaleplate moves pointer is station ary when setting the temperature the thermostat is a Group I model If the scaleplate is stationary and the poin...

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