Honeywell T874H Multistage Thermostat Instruction Manual
T874H,Q,W MULTISTAGE THERMOSTATS AND Q674B,C,G,L SUBBASES
THERMOSTAT
FALL
SUBBASE
SYSTEM COMPONENTS
L1
(HOT)
1
1
L2
H1 ANTICIPATOR
2
T
W3
U
H1
C815A OD THERMISTOR
H2
H2 ANTICIPATOR
3
AUX. HEAT RELAY
FALL
AUXILIARY
HEAT LED
(GREEN)
FAN SWITCH
H3 ANTICIPATOR
4
AUTO
ON
G
FAN RELAY
EMERGENCY
HEAT LED
(RED)
H3
R
FALL
5
E
L
6
EM. HEAT RELAY
RESET
COMPRESSOR
MONITOR
CHECK LED
(RED)
RISE
X
B
8
9
SYSTEM
SWITCH
C1
EM.HEAT
HEAT
CHANGEOVER
RELAY (HEAT)
2
CHANGEOVER
RELAY (COOL)
C1 ANTICIPATOR
10
OFF
O
COMPRESSOR
CONTACTOR 1
COOL
C2 ANTICIPATOR
11
RISE
Y1
COMPRESSOR
CONTACTOR 2
C2
12
Y2
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
CONNECT CHANGEOVER RELAY TO 'O' TERMINAL FOR CHANGEOVER IN COOLING OR TO 'B' TERMINAL FOR CHANGEOVER IN HEATING.
M156A
Fig. 8. T874W/Q674L for three-stage heat and two-stage cool with outdoor reset and compressor monitor.
69-0087—6
5
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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