T87F THERMOSTATS
7
60-2222—3
Fig. 12. T87F (replacing a series 10 thermostat) connected
to a 3-wire open contact, high-limit control.
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).
Fig. 13. Tradeline® T87F in Series 20 Heating Circuit.
To wire a series 20 thermostat:
SETTINGS AND CHECKOUT
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).
Fig. 14. T87F interior detail.
Fig. 15. Adjust heat anticipator to match current rating of
primary control.
Series 20 Thermostat
T87F Thermostat
R
R
B
W
W
Y
LOW LIMIT
OPERATING CONTROL
T87F
SERIES 10 OPEN
CIRCUIT HIGH LIMIT
JUMPER
TO THERMOSTAT
CONNECTIONS ON
SERIES 10 VALVE
AT BURNER
M6102
B
W
R
Y
R
W
B
W
R
137421A
WALLPLATE
SERIES 20
MOTOR OR VALVE
LEVEL
LEVEL
TRANSFORMER
L1
(HOT)
L2
M20778
R
B
W
Y
R
W
TR
TR
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
MAKE CONNECTIONS AS SHOWN: R TO R, W TO B, Y TO W.
1
2
1
2
CAPTIVE
MOUNTING
SCREW (3)
HEAT ANTICIPATOR INDICATOR
ROOM TEMPERATURE SCALE
M19049
CALIBRATION NUT
SETTING SCALE
ADJUSTABLE RANGE
STOPS ON SOME MODELS
.15
.12
.2
.6
.8
1.0
.5
.4
.3
HOLE SUITABLE FOR
PENCIL POINT
TO MOVE INDICATOR
HEAT
ANTICIPATOR
INDICATOR
SCALE
M1368A