137421N,P Wallplates; T87F Zone
Thermostat and Q539A,B Subbases
The T87F Thermostat provides 24 Vac single-stage
temperature control of Honeywell Zone Control Panels.
The panel operates the heating or cooling systems and
zone dampers in response to the T87F Zone
Table 1. Thermostat/Wallplate and Subbase Applications and Specifications.
To control zones other than zone
1 using MM-2 or MM-3 Zone
Control Panels. To control zone
damper actuators in independent
To control any zone on TZ-3,
EZ-2, EZ-4, EMM-3 or EMM-3U
or zone one on MM-2 or MM-3
Zone Control Panels.
To control zone damper
actuators in independent zones
in heating-cooling systems.
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.
® U.S. Registered Trademark
Copyright © 2002 Honeywell •
T87F Zone Thermostat and
•All Rights Reserved
Thermostats. The T87F is used with the 137421N or P
Wallplate (provided) or Q539A or B Subbase (ordered
separately), depending on application. See Table 1 for
thermostat/wallplate and subbase applications and
When Installing This Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
2. Disconnect the power supply to prevent electrical
shock or equipment damage.
3. Check the rating given in the instructions and on
the product to make sure the product is suitable for
4. Installer must be a trained, experienced service
5. After completing installation, use these instructions
to check out the product operation.
Wallplate included with
thermostat. Terminals are
marked: W, R, Y.