Honeywell T87F User manual

1 69-0665—1
Application
The T87F Universal Thermostat provides temperature
control for 24 to 30 Vac residential heating, cooling or
heating-cooling systems. A 6 in. [152 mm] cover ring and
137421 3-terminal wallplate with Series 20 terminal
markings are included. For heating-only or cooling-only
applications, use the enclosed wallplate. For heating/cool-
ing applications, order a Q539 Subbase, which provides
switching at the thermostat location.
The spdt switch makes one set of contacts on a tempera-
ture 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.
Recycling 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 1-800-
468-1502.
Installation and Setting
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to fol-
low them could damage the product or 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.
S. M. • Rev. 9-93 • • ©Honeywell Inc. 1993 • Form Number 69-0665—1
T87F
Universal Thermostat
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M3375
M3375
CAUTION
1. Disconnect power supply to prevent electri-
cal 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 mount-
ing screws, because damage to subbase threads
can result.
2. Do not short across coil terminals on relay.
This can burn out 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 [1.5 m] 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 the 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 care-
fully adjusted at the factory. Handle it carefully.
MOUNTING WALLPLATE TO WALL
IMPORTANT:
1. Use plumb line or spirit level to accurately level the
wallplate 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.
Use cover ring (if desired) and wallplate assembly,
T87F, and mounting screws as shown in Fig. 2.
1. Place cover ring on the wall at the desired location
with the cable entrance holes to the left.
2. Bring the thermostat cable through the bottom en-
trance hole of the cover ring and through the wallplate
entrance hole.
3. Fasten the cover ring and wallplate to the wall with
the mounting screws as shown in Fig. 2.
4. Mount thermostat on a level wallplate to maintain
accurate calibration. See Fig. 1.

2
Fig. 1—Leveling wallplate or subbase with
spirit level or plumb line.
SPIRIT
LEVEL
DIAMOND
GUIDES (2)
LEVELING
POSTS (2)
MOUNTING
SLOTS
M3319
VERTICAL
PLUMB LINE
OPENING FOR
THERMOSTAT
WIRING
Fig. 2—Mounting wallplate or subbase to wall.
WALL
1
USE WALLPLATE FOR HEAT APPLICATIONS.
126293 COVER
RING (OPTIONAL)
THERMOSTAT CABLE
ENTERANCE HOLE
NO. 4 X 1 INCH SHEET
METAL SCREWS (2)
WALLPLATE
M3829
MOLDED
LEVELING
POST
MOUNTING WALLPLATE ON OUTLET BOX
Use cover plate, wallplate assembly, T87F, and screws
as shown in Fig. 3.
1. Place the cover plate on the outlet box with the cable
entrance holes toward the bottom.
2. Pull the thermostat cable through the bottom hole.
3. Align the diamonds on the cover ring vertically and
secure cover plate with the screws provided.
NOTE: The side reading “Made in U.S.A.” must be against
the wall.
4. Position the wallplate assembly and pull the thermo-
stat cable through the cable entrance hole.
5. Mount wallplate with the two screws provided.
Tighten screws after the wallplate has been leveled. See
Fig. 1 for leveling instructions.
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.
4-8. 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.
Fig. 3—Mounting wallplate/subbase to outlet
box.
M3844
OUTLET BOX
COVER
RING
1
CAPTIVE
SCREWS (3)
THERMOSTAT CABLE
ENTRANCE HOLE
T87F
IF OUTLET BOX IS HORIZONTAL, MOUNT COVER RING IN
POSITION SHOWN, BUT FASTEN WITH SCREWS THROUGH "A".
USE WALLPLATE FOR HEAT APPLICATIONS.
1
A
A
Q539
SUBBASE
2
2
Fig. 4—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.
R
Y
W
BURNER
MOTOR
FAN
MOTOR
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
IGNITION
OIL VALVE
WHITE
ORANGE
BLACK
R8184G
THERMOSTAT
CAD CELL
L1 (HOT)
L2
LIMIT
FAN
COMBINATION FAN
AND LIMIT CONTROL
2R8184 PROTECTORELAY OIL PRIMARY CONTAINS
INTERNAL TRANSFORMER.
M6105
T
2
1
T
F
F

3 69-0665—1
R
W
1
L1
(HOT)
L2
FAN
MOTOR
COMBINATION
FAN AND LIGHT
CONTROL
LIMIT FAN
TRANSFORMER
GAS VALVE
T87F
TH
TH TR
TR
M5318
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Y
Fig. 5—T87F used for 2-wire, spst control of
heating only in a typical gas system.
1
L1
(HOT)
L2
1
COOLING
CONTACTOR COIL
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
ONLY R AND Y TERMINALS ARE USED FOR
COOLING ONLY.
M3516
R
Y
THERMOSTAT
WALLPLATE OR
SUBBASE
POWER
SUPPLY
2
2
Fig. 8—T87F used in cooling only system.
Fig. 7—T87F used for Series 20, 3-wire, spdt
control of low-voltage motors and electric
radiator valves. Used in applications where
thermostat makes contact on both a rise and
fall in room temperature.
THERMOSTAT
M6102
RY
W
LOW LIMIT
OPERATING CONTROL JUMPER
SERIES 10 OPEN
CIRCUIT HIGH LIMIT
TO THERMOSTAT
CONNECTIONS ON
SERIES 10 VALVE
AT BURNER
BB
WW
RR
Fig. 6—T87F replacing a Series 10 Thermostat
connected to a 3-wire, open-contact, high-limit
control.
MOUNTING THERMOSTAT TO WALLPLATE
To remove standard cover, pull ring outward with fin-
gertips, pressing lightly on dial with thumbs.
Remove and discard the plastic insert protecting the mer-
cury switch.
Align the thermostat over the wallplate and tighten the
three captive mounting screws. These captive screws com-
plete the electrical connections to the thermostat. Adjust
heat anticipator to match current rating of primary control.
See Fig. 9.
HEAT ANTICIPATOR SETTING
Adjust anticipator to match current rating of primary
control. Rating is usually stamped on the control name-
plate. Move the indicator to the marking that matches this
rating. Indicator may be moved with fingers or pencil point
through hole shown in Fig. 9. If the current rating is not
given, proceed as follows before mounting the thermostat:
1. Connect an ac ammeter of appropriate range (0 to
2.0A, for example) between the R and W terminals on the
wallplate or subbase.
2. Let the system operate for one minute before reading
the ammeter.
3. Move the anticipator indicator to match the amme-
ter reading.
A slightly higher setting to obtain longer burner-on
times (fewer cycles per hour) may be desirable for some
systems.
Fig. 9—Setting heat anticipator current rating.
LONGER
.15 .12
.2
.6
.8
1.0
.5
.4
.3
HOLE SUITABLE FOR
PENCIL POINT
TO MOVE INDICATOR HEAT
ANTICIPATOR
INDICATOR
SCALE
M1368
EXAMPLE: If burner-on time is too short with a setting of
0.4, adjust to 0.45 and check system operation; adjust
to 0.5 setting and recheck until the desired burner-on
time is obtained.
IMPORTANT: When T87F is used in a Series 20 heat-
ing circuit (requires contact on both a rise and fall
in temperature, see Fig. 7), set anticipator indicator
to 1.2.
TEMPERATURE SELECTION
To select the temperature control point, turn the trans-
parent dial until the desired point on the setting scale (top) is
aligned with the pointer.
RECALIBRATION
The T87F is calibrated at the factory and no recali-
bration should be necessary. If the thermostat is accurately
leveled and still appears to be out of calibration, order
104994A Calibration Wrench. Instructions for recali-
brating are furnished with the wrench.
RED
WHITE
BLUE
137421A
WALLPLATE
W
Y
R
B
W
RTR
L1
(HOT)
L2
THREE-WIRE SPDT
VALVE OR MOTOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M5319
1
1

4
Home and Building Control Home and Building Control Helping You Control Your World
Honeywell Inc. Honeywell Limited—Honeywell Limitée
1985 Douglas Drive North 740 Ellesmere Road
Golden Valley, MN 55422 Scarborough, Ontario
M1P 2V9
Printed in U.S.A.
QUALITY IS KEY
Checkout
HEATING
Turn down temperature setting to lowest point. If sub-
base is used, move system switch to HEAT position.
Raise temperature setting until heating equipment starts.
This point should be at room temperature as indicated on
the thermometer. Turn back dial slowly. Heating equip-
ment should stop when dial has been turned below room
temperature.
COOLING
CAUTION
1. Do not operate cooling if outdoor temperature
is below 50°F [10°C]. Refer to manufac-
turer recommendations.
2. Allow five-minute off-time after compressor
has been run to avoid compressor damage.
If T87F controls cooling, move system switch (if
used) to call for COOL and lower setting until cooling
equipment starts. Raise setting above room temperature
and cooling system should shut down. Make certain all
equipment responds properly to the thermostat.
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