Honeywell T874H Multistage Thermostat Instruction Manual
T874H,Q,W MULTISTAGE THERMOSTATS AND Q674B,C,G,L SUBBASES
FOR STRAIGHT
INSERTION–
STRIP 5/16 in. (8 mm)
FOR WRAPAROUND–
STRIP 7/16 in. (11 mm)
Mounting C815A Thermistor (T874W only)
The T874W is used with the C815A Thermistor mounted in
the outdoor section. Locate it in an area where it can
measure the true outdoor ambient temperature. Avoid
mounting the C815A in an area where it is exposed to high
temperatures or direct sunlight. Refer to heat pump
equipment instructions for proper mounting.
BARRIER
SUBBASE TERMINAL SCREW
M928
Fig. 3. Wiring connections.
SYSTEM COMPONENTS
THERMOSTAT
SUBBASE
2
3
4
Y1
H1
ANTICIPATOR
COOL CHANGEOVER
VALVE
FALL
H1
FAN SWITCH
AUTO
FAN RELAY
G
R
ON
Y2
SYSTEM
SWITCH
8
9
COMPRESSOR
CONTACTOR
OFF
B
RISE
AUTO
C1
ANTICIPATOR
CO
1
L2
L1
(HOT)
10
O
X
2
RISE
C1
SERVICE LED
(YELLOW)
COMPRESSOR
FAULT
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
2
C
SERVICE LED ON SELECT MODELS.
M3680A
Fig. 4. T874H/Q674C in heating-cooling system.
THERMOSTAT
SYSTEM COMPONENTS
SUBBASE
2
Y1
H1 ANTICIPATOR
3
COOL CHANGEOVER
VALVE
FAN SWITCH
H1
FALL
1
AUTO
ON
G
L2
FAN RELAY
4
R
L1
(HOT)
COMPRESSOR
CONTACTOR
Y2
B
RISE
CO
8
9
O
SYSTEM
SWITCH
X
SERVICE
LED (YELLOW)
C1 ANTICIPATOR
10
OFF
X1
AUTO
RISE
C1
C
24 VAC
FILTER LED (RED)
X2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M5902
Fig. 5. T874H/Q674C in heating-cooling system with SERVICE LED and FILTER LED.
69-0087—6
3
firealarmresources.com
| General | Details |
|---|---|
| Name | Honeywell T874H Multistage Thermostat Instruction Manual |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.19 MB |
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