Honeywell T921B ユーザーズマニュアル
60-2242—2
6
Fig. 7—Typical wiring diagram for T921B.
T921A,B,E-G
INSTALLATION • SETTING AND ADJUSTING
Fig. 9—Typical wiring diagram for T921F.
L1
(HOT)
(HOT)
L2
1
1
SERIES 90
MODULATING
MOTOR
MODULATING
MOTOR
T921F
M5993
CLASS 2 POWER SUPPLY.
INTERCHANGE B AND W CONNECTIONS TO REVERSE
DIRECTION OF MOTOR TRAVEL.
DIRECTION OF MOTOR TRAVEL.
USE FOR CLASS 2 CIRCUITS. MAKES R TO B ON
TEMPERATURE FALL BELOW THROTTLING RANGE:
2˚ F [1˚ C] DIFFERENTIAL. SEE FIG. 10.
TEMPERATURE FALL BELOW THROTTLING RANGE:
2˚ F [1˚ C] DIFFERENTIAL. SEE FIG. 10.
T
R
W
B
T
B
W
R
2
TRANSFORMER
B
W
2
B
W
R
AUXILIARY
SWITCH
SWITCH
2-POSITION
ACTUATOR
ACTUATOR
3
3
Fig. 10—Typical wiring diagram for T921G.
L1
(HOT)
(HOT)
L2
1
1
SERIES 90
MODULATING
MOTOR
MODULATING
MOTOR
T921G
M5996
CLASS 2 POWER SUPPLY.
INTERCHANGE B AND W CONNECTIONS TO REVERSE
DIRECTION OF MOTOR TRAVEL.
DIRECTION OF MOTOR TRAVEL.
USE FOR CLASS 2 CIRCUITS. MAKES R TO B ON
TEMPERATURE RISE ABOVE THROTTLING RANGE:
1˚ F [0.5˚ C] DIFFERENTIAL. SEE FIG. 11.
TEMPERATURE RISE ABOVE THROTTLING RANGE:
1˚ F [0.5˚ C] DIFFERENTIAL. SEE FIG. 11.
T
R
W
B
T
B
W
R
2
TRANSFORMER
B
W
2
B
W
R
AUXILIARY
SWITCH
SWITCH
2-POSITION
ACTUATOR
ACTUATOR
3
3
L1
(HOT)
(HOT)
L2
1
1
TIMER SWITCH
(OPTIONAL)
(OPTIONAL)
SERIES 90
MODULATING
MOTOR
MODULATING
MOTOR
T921E
M5988A
NIGHT
SETBACK
SWITCH
SETBACK
SWITCH
HEATER
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
OVERLOAD PROTECTION AS REQUIRED.
H TERMINAL IS A BLACK LEADWIRE.
T
R
W
B
T
B
W
R
H
2
2
TRANSFORMER
Fig. 8—Typical wiring diagram for T921E.
L1
(HOT)
(HOT)
L2
1
1
SERIES 90
MODULATING
MOTOR
MODULATING
MOTOR
T921B
M5992
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
OVERLOAD PROTECTION AS REQUIRED.
INTERCHANGE B AND W CONNECTIONS TO REVERSE
DIRECTION OF MOTOR TRAVEL.
DIRECTION OF MOTOR TRAVEL.
T
R
W
B
T
B
W
R
2
2
TRANSFORMER
B
W
SUMMER-
COOL
WINTER-HEAT
Setting and Adjusting
TEMPERATURE SETTING
Adjust all T921 models at the top of the thermostat for
vertically mounted models and on the left side for horizon-
tally mounted models using the setting adjustment knob or
an Allen wrench (see Fig. 11). The device is shipped with
the temperature setting indicator at the center of the tem-
perature range. Without removing the cover, turn the set-
ting adjustment knob or use an Allen wrench so the indica-
tor is at the desired average room temperature.
tally mounted models using the setting adjustment knob or
an Allen wrench (see Fig. 11). The device is shipped with
the temperature setting indicator at the center of the tem-
perature range. Without removing the cover, turn the set-
ting adjustment knob or use an Allen wrench so the indica-
tor is at the desired average room temperature.
ADDITIONAL FEATURES:
T921B SUMMER-WINTER CHANGEOVER
T921B SUMMER-WINTER CHANGEOVER
The T921B includes a summer-winter changeover switch.
It is labeled COOL-HEAT. For horizontally mounted
models, this switch is located on the left side of the
thermostat. For vertically mounted models, it is lo-
cated on the top of the thermostat (see Fig. 11).
models, this switch is located on the left side of the
thermostat. For vertically mounted models, it is lo-
cated on the top of the thermostat (see Fig. 11).
T921E NIGHT SETBACK
The T921E includes a manual night setback switch
located on the top of the thermostat (see Fig. 11).