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.
IMPORTANT This product is tested and calibrated under closely controlled conditions and some minor differences in performance can be expected if those conditions are changed. The specifications in this publication do not include normal manufacturing tolerances; therefore, an individual unit may not exactly match the listed specifications.
Tradeline® Models:
For use in series 80 heating, cooling, or heating-cooling circuit, or for use in series 20 (spdt) heating only circuit. Tradeline® specifications are the same as those of standard models, except as follows: T87F Heating, Cooling, or Heating-Cooling Thermostat. T87F Enhanced Setpoint Visibility Model for the visually impaired.
T87F models that meet Department of Defense (DoD) Manual 4270.1-M specifications.
Temperature Ratings:
Mounting:
T87F (without positive Off) furnished with 137421A Wallplate. T87F (with positive Off) furnished with 137421B Wallplate. Both wallplates suitable for controlling 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 appearance (198170A Wallplate for Designer Models).
Tradeline® pack with cross reference label and special instruction sheet.
T87F Heating, Cooling, or Heating-Cooling Thermostat. Thermostat includes 104456B Wallplate for heating only sys-tems. Order Q539 Subbase for heating-cooling.
Mounting:
Thermostat mounts on furnished wallplate, or subbase (order separately).
Finish:
Premier White® or taupe.
Optional Specifications:
Positive Off Models (specify heating or cooling): 60°F to 100°F (16°C to 38°C) or 50°F to 90°F (10°C to 32°C) range.
Locking Cover and Range Stop Models:
60°F to 90°F (16°C to 32°C).
45°F to 75°F (7°C to 24°C) range, 68°F marked on scale.
Scale Range Models:
Q539 Subbases provide system and fan switching and cool-
ing anticipation (unless otherwise specified) for T87F heat-ing, cooling and heating-cooling thermostats. TG587F1008 Thermostat Guard Key Lock Cover with window. TG587F1016 Thermostat Guard Key Lock cover without
window.
MERCURY NOTICE
If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Dispose of properly.
Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control.
CAUTION Voltage Hazard.
Can cause electrical shock or equipment damage. Disconnect power before beginning installation.
Equipment Damage Hazard.
Improper installation can burn out thermostat heat anticipator.
On systems using a low voltage gas valve, do not apply a jumper across the valve coil terminals.
When Installing this Product. . .
Locate 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:
This thermostat is a precision instrument and was carefully adjusted at the factory. Handle it carefully.
IMPORTANT Use a spirit level to accurately level the wallplate or subbase as shown in Fig. 1. Inaccurate leveling may cause the thermostat to deviate from setpoint.
When using the T87F with a Q539 Subbase, follow the mounting and wiring instructions for the subbase. Use the cover ring (if desired), adapter plate (if needed), wallplate or subbase, T87F and screws as shown in Fig. 2 and 3.
IMPORTANT Before mounting the thermostat, see Setting and Checkout section, Heat Anticipator Adjustment sub-section.
CAUTION Voltage Hazard.
Can cause electrical shock or equipment damage. Disconnect power before beginning installation.
IMPORTANT All wiring must comply with local electrical codes and ordinances.
The T87F may be used in most 2- or 3-wire, spst or spdt, 24 Vac to 30 Vac heating systems controlled by a low voltage thermostat. The following wiring diagrams represent typical applications.
To adapt the T87F to a series 10 three-wire heating system:
NOTES:
To Replace a Series 20 Thermostat
Tradeline® T87F Thermostats directly replace series 20 spdt thermostats, or thermostats in heating installations that require contact on both a rise and fall in temperature (see Fig. 13).
To wire a series 20 thermostat:
Series 20 Thermostat | T87F Thermostat |
R | R |
B | W |
W | Y |
Temperature Selection
To select the desired temperature, turn the transparent dial until the desired point on the setting scale (top scale) is in line with the pointer.
On models with range stops the temperature range may be limited at either extreme. The left stop is for the low extreme, the right stop for the high extreme (see Fig. 14).
Heat Anticipator 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).
IMPORTANT When the T87F is used in a series 20 heating circuit (requires contact on both a rise and fall in temperature), set the anticipator indicator to 1.2.
If the current rating is not known, proceed as follows:
CAUTION Equipment Damage Hazard.
Improper installation can burn out thermostat heat anticipator.
On systems using a low voltage gas valve, do not apply a jumper across the valve coil terminals.
To check thermostat operation:
IMPORTANT
Remove the thermostat cover ring so you can observe the mercury switch action. After a five- or ten-minute off-period (with thermostat setting below the room temperature), slowly raise the setting until the switch just makes contact. If the thermometer pointer and setting indicator read the same the instant you see the switch make, no recalibration is necessary. If recalibration is necessary, proceed as follows:
NOTE: When the T87F provides cooling control, calibration for heating automatically calibrates for cooling.
Automation and Control Solutions
Honeywell
1985 Douglas Drive North Golden Valley, MN 55422
Honeywell Limited-Honeywell Limitée 35 Dynamic Drive
Scarborough, Ontario
M1V 4Z9
Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers.
www.honeywell.com/yourhome
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Honeywell T87F Non-Programmable Thermostat User Guide
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