T87F Zone Thermostat and
137421N,P Wallplates; T87F Zone
Thermostat and Q539A,B Subbases
INSTALLATION INSTRUCTIONS
APPLICATION
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.
Thermostat
/Wallplate
or Subbase Application
T87F3707/
137421N
T87F3715/
137421P
T87F3715/
Q539A1436
T87F3707/
Q539A1428
T87F3715/
Q539B1039
T87F3707/
Q539B1021
To control zones other than zone
1 using MM-2 or MM-3 Zone
Control Panels. To control zone
damper actuators in independent
heating-only systems.
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.
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.
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
specifications.
Switching
CommentsSystem Fan
None None Wallplate included with
COOL-OFFHEAT
HEAT__COOL None Q539B ordered
ON-AUTO Q539A ordered
thermostat. Terminals are
marked: W, R, Y.
separately. Terminals
marked: R,W,Y,G,O,B.
separately. Terminals
marked: 4,5,6.
INSTALLATION
When Installing This Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous condition.
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
your application.
4. Installer must be a trained, experienced service
technician.
5. After completing installation, use these instructions
to check out the product operation.
® U.S. Registered Trademark
Copyright © 2002 Honeywell • •All Rights Reserved
69- 0579- 4
T87F ZONE THERMOSTAT AND 137421N,P WALLPLATES; T87F ZONE THERMOSTAT AND Q539A,B SUBBASES
A
Selecting Location
• Install the thermostat about 5 ft (1.5 meters) 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.
• Handle this thermostat carefully; it is a precision
instrument that was carefully calibrated at the factory.
CAUTION
Electrical Shock Hazard
Can cause personal injury or equipment
damage.
Disconnect power supply before installation.
Mounting and Wiring
IMPORTANT
To prevent interference with thermostat linkage,
keep wire length to a minimum and run wires as
close as possible to the subbase.
All wiring must comply with local codes and ordinances.
T87F Zone Thermostat and wallplate or subbase are
used in zoned conventional single-stage heating or
heating-cooling systems.
137421 Wallplate or Q539 Subbase
REPLACEMENT APPLICATION
1. Remove old equipment. Dispose of properly. See
Mercury Notice.
2. Check the existing wallplate or subbase wires for
cracked or frayed insulation.
3. Replace any wires in poor condition.
4. If the wires are plastered into the wall, make a hole
next to the wires so they can be pushed back into
the wall later.
5. Continue with step 3 for New Installation.
NEW INSTALLATIONS
1. Run low voltage thermostat cable (if necessary) to
the thermostat location.
2. Pull about 3 in. (76 mm) of cable through a hole in
the wall.
3. Connect wires to the terminals inside the wallplate
or subbase. See Fig. 1 and 2 or zone control panel
installation instructions for wiring diagrams of typical zone systems.
4. Push excess wire back through the hole and plug
any opening with insulation to prevent drafts that
can affect thermostat performance.
137421 Wiring Cross Reference
Old Terminal New Terminal
4W
5R
6Y
5. Loosely fasten the thermostat wallplate or subbase
to the wall with a screw through the left mounting
hole. See Fig. 3.
6. Adjust the wallplate or subbase so it is approxi-
mately level and start the second screw through
the right mounting slot. Do not tighten.
T87F3715/Q539B1039
T87F3707/Q539B1021
ADJUSTABLE
HEAT
ANTICIPATOR
HEAT COOL HEAT COOL
J
R/5
R
C
T140 TRANSFORMER
W
J
TEMPERATUE RISE
TEMPERATUE FALL
Y
W/4
Y/6
ARD CONFIGURED
WITH POWER OPEN
M14842
Fig. 1. Wiring single ARD (power open) to thermostat.
T87F3715/Q539B1039
T87F3707/Q539B1021
ADJUSTABLE
HEAT
ANTICIPATOR
W
HEAT COOL HEAT COOL
J
J
3
R/5
DAMPER
ACTUATOR
1
L2
L1
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
NO SYSTEM SWITCHING ON 137421 WALLPLATE.
3
FOR CORRECT SYSTEM OPERATION, DO NOT DISCONNECT FACTORYINSTALLED J-J JUMPER ON Q539B.
Fig. 2. Wiring T87F Thermostat and Q539B Subbase
or 137421 Wallplate in independent zone.
(COM) (HOT)
TEMPERATUE RISE
TEMPERATUE FALL
Y
2
Y/6W/4
4
5 6 Z
1 2 3
X
M19059
69-0579-4 2
T87F ZONE THERMOSTAT AND 137421N,P WALLPLATES; T87F ZONE THERMOSTAT AND Q539A,B SUBBASES
THERMOSTAT
CABLE
ENTRANCE
HOLE
137421
1
WALLPLATE
1
USE 137421 WALLPLATE FOR HEAT ONLY APPLICATIONS.
SEE TABLE 1 APPLICATION INFORMATION.
Fig. 3. Mounting T87F Thermostat and 137421
Wallplate or Q539 Subbase.
IMPORTANT
An incorrectly leveled thermostat causes the
temperature control to deviate from setpoint.
7. Level the thermostat wallplate or subbase exactly
using a spirit level as shown in Fig. 4.
IMPORTANT
Do not overtighten thermostat captive mounting
screws because damage to subbase threads
can result.
T87F
THERMOSTAT
COVER RING
Q539
SUBBASE
CAPTIVE
MOUNTING
SCREWS (3)
THERMOSTAT
CABLE
ENTRANCE
HOLE
1
M19048
8. Tighten mounting screws.
T87 Thermostat
1. Before mounting the thermostat, see Heat Antici-
pator Adjustment in Settings and Adjustments section.
2. Align the thermostat over the wallplate or subbase
and tighten the three mounting screws.
MOLDED POST
MOUNTING
HOLES
HORIZONTAL
CENTER
LINE
OPENING
FOR
THERMOSTAT
WIRING
Fig. 4. Leveling wallplate or subbase before
[13]
1
2
9
[14]
16
mounting T87F.
VERTICAL GUIDE
SPIRIT
LEVEL
MOUNTING
SLOTS
MOUNTING
SLOTS
M1371B
Settings and Adjustments
Temperature Selection
To select the desired temperature for each zone, turn the
transparent dial on the zone thermostat until the desired
point on the setting scale (top scale) is aligned with the
pointer.
System and Fan Switching
Q539A
The Q539A provides System and Fan switches to control
heating-cooling equipment and zone one fan in multizone applications:
• The System switch controls the system operation:
— Heat: Only the heating system operates.
— Off: Both heating and cooling control systems are
disconnected.
— Cool: Only the cooling system operates.
• The Fan switch controls the fan operation:
— Auto: The fan operates in response to the plenum
fan control in heating; the fan operates in
response to the thermostat in cooling.
— On: The fan runs continuously.
• To change positions, use thumb and index fingers to
move the switch lever to the desired position. Place
the switch lever directly over the selected function
indicator mark.
3 69-0579-4
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