Honeywell T874H Multistage Thermostat Instruction Manual
T874H,Q,W MULTISTAGE THERMOSTATS AND Q674B,C,G,L SUBBASES
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
H1 ANTICIPATOR
1
W1
NO FAN
SWITCH
3
CHANGEOVER
RELAY
FALL
B
H1
4
6
W2
H2 ANTICIPATOR
FAN RELAY
G
FALL
SYSTEM
SWITCH
OFF
H2
Y1
8
9
1
COMPRESSOR
CONTACTOR
L2
AUTO
C1
R
L1
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
C1 ANTICIPATOR
10
M6008A
RISE
Fig. 6. T874Q/Q674G for heating only system.
SUBBASE
THERMOSTAT
SYSTEM COMPONENTS
1
L1 (HOT)
L2
1
H1 ANTICIPATOR
H2 ANTICIPATOR
R
C815A THERMISTOR
FALL
H1
2
T
FAN SWITCH
AUTO
FALL
3
4
W1
W2
H3
HEAT RELAY 1
HEAT RELAY 3
ON
H3 ANTICIPATOR
HEAT RELAY 2
5
6
W3
B
FALL
H2
SYSTEM
SWITCH
RESET HEATER
HEAT CHANGEOVER VALVE
FAN RELAY
HEAT
OFF
RISE
G
O
8
C1
COOL
C1 ANTICIPATOR
C2 ANTICIPATOR
10
11
COOL CHANGEOVER VALVE
COMPRESSOR CONTACTOR 2
RISE
Y2
Y1
C2
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
1
COMPRESSOR CONTACTOR 1
M3674
Fig. 7. T874W/Q674B with outdoor reset in heating and cooling system.
69-0087—6
4
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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