Pentax T87F Installation Manual
TRADELINE
T87F
Universal Thermostat
Installation Instructions for the Trained Service Technician.
Application
The T87F Universal Thermostat provides temperature control for 24 to 30 Vac residential heating, cooling
or heating-cooling systems. For heating systems, the
T87F mounts on the wallplate provided. For cooling
only, or heating-cooling, order the 137421A (198170A
if textured designer model) Heating-Cooling Wallplate
with remote switching, or the Q539 Subbase, which
provides switching at the thermostat location.
The spdt switch makes one set of contacts on a temperature fall to operate the heating system. The other set
of contacts make on a temperature rise to operate the
cooling system when the T87F is used to control cooling.
Heat anticipation is adjustable, 0.1 to 1.2A.
M3375
Mercury Notice
This control contains mercury in a sealed tube. Do not
place control in the trash at the end of its useful life.
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old control in
the trash.
Contact your local waste management authority for
instructions regarding recycling and the proper disposal
of this control, or of an old control containing mercury in
a sealed tube.
If you have questions, call Honeywell Inc. at 1800-468-1502.
Installation and Setting
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to fol-
low them could cause a hazardous condition.
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
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
CAUTION
1. Disconnect power supply to prevent electrical shock or equipment damage.
2. To prevent interference with the thermostat
linkage, keep wire length to a minimum and
run wires as close as possible to the subbase.
3. Do not overtighten thermostat captive mounting screws because damage to subbase threads
can result.
4. Do not short across coil terminals on relay.
This can burn out the thermostat heat anticipator.
IMPORTANT: An incorrectly leveled thermostat will
cause the temperature control to deviate from set
point.
LOCATION
Install 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 may 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.
This thermostat is a precision instrument and was
carefully adjusted at the factory. Handle it carefully.
MOUNTING WALLPLATE OR SUBBASE (Fig. 2)
IMPORTANT:
1. Use a spirit level to accurately level the wallplate
or subbase as in Fig. 1. Inaccurate leveling may
cause thermostat control deviation.
2. When using the T87F with a Q539 Subbase, follow
the mounting and wiring instructions included with
the subbase.
1. Place the wallplate on the wall at the desired loca-
tion. Pull the thermostat cable through the entrance hole.
2. Fasten wallplate. Do not tighten the screws.
3. Level according to Fig. 1 then tighten screws.
4. After wiring wallplate, plug hole to prevent drafts
from affecting thermostat.
NOTE: To mount T87 Thermostat on an outlet box,
order 129044A Adapter Ring Assembly.
®U.S. Registered Trademark
Copyright © 2002 Honeywell • • All Rights Reserved
60-0830-4
Fig. 1—Leveling wallplate or subbase with
spirit level or plumb line.
SPIRIT
LEVEL
OPENING FOR
THERMOSTAT
WIRING
LEVELING
POSTS (2)
MOUNTING
SLOTS
M3319A
Fig. 2—Mounting wallplate or subbase to wall.
COVER RING
MOLDED
LEVELING
POST
WALLPLATE
SHOWN
THERMOSTAT CABLE
ENTRANCE HOLES
NO. 4 X 1 INCH
SHEET METAL SCREWS (2)
WIRING
All wiring must comply with local electrical codes
and ordinances. Disconnect power supply before connecting wiring to prevent electrical shock or equipment
damage.
The T87F is adaptable to most 2-wire, 24 to 30 volt
heating systems, and to most 3-wire, 24 to 30 volt
heating systems controlled by a Series 10 Thermostat.
The following hookups are typical applications. See
Figs. 3 through 7. When using the T87F for cooling
control, refer to the hookups in the Q539 Subbase instructions.
For variations of these systems, refer to the installation instructions for the controlled equipment.
After wiring the wallplate, plug the hole to prevent
drafts that may affect the thermostat.
ADD T87F AS
SHOWN ON OUTLET
BOX MOUNTING
M5324
Fig. 3—T87F used for 2-wire, spst control of
heating only in a typical oil system. Low
voltage power for the control circuit is supplied
by a transformer in the oil primary control.
COMBINATION
L1 (HOT)
FAN AND LIMIT
L2
137421A
WALLPLATE
TR
TRTH
CONTROL
BURNER
MOTOR
T
T
F
F
IGNITION
R8184G
WHITE
2
ORANGE
BLACK
TRANSFORMER
B
W
R
OIL VALVE
COMBINATION
FAN AND LIMIT
CONTROL
FAN
LIMIT
JUMPER
B
W
R
FAN
MOTOR
3
M6105
1
FAN
MOTOR
M5318
TO THERMOSTAT
CONNECTIONS ON
SERIES 10 VALVE
AT BURNER
M6102
1
THERMOSTAT
Y
R
W
CAD
CELL
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
OVERLOAD PROTECTION AS REQUIRED.
R8184 PROTECTORELAY OIL PRIMARY CONTAINS
2
INTERNAL TRANSFORMER.
3
CONNECT OIL VALVE, IF APPLICABLE.
Fig. 4—T87F used for 2-wire, spst control of
heating only in a typical gas system.
Y
R
W
GAS VALVE
TH
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 5—T87F replacing a Series 10 Thermostat
connected to a 3-wire, open-contact, high-limit
control.
LOW LIMIT
OPERATING CONTROL
T87F
Y
R
W
SERIES 10 OPEN
CIRCUIT HIGH LIMIT
L1
(HOT)
L2
60-0830—4 2
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