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Honeywell T874H Multistage Thermostat Instruction Manual

T874H,Q,W MULTISTAGE THERMOSTATS AND Q674B,C,G,L SUBBASES  
THERMOSTAT  
SUBBASE  
SYSTEM COMPONENTS  
1
FALL  
H1  
H1 ANTICIPATOR  
2
T
C815A OUTDOOR  
THERMISTOR  
W3  
H2  
H2 ANTICIPATOR  
3
FALL  
AUX. HT. RELAY  
AUX. HEAT  
LED (GREEN)  
FAN SWITCH  
AUTO  
H3 ANTICIPATOR  
4
G
R
ON  
FAN RELAY  
H3  
L1  
(HOT)  
FALL  
5
L2  
1
EM. HEAT  
LED (RED)  
E
6
EM. HT. RELAY  
RESET  
X1  
CHECK LED  
(YELLOW)  
C
B
RISE  
CHANGEOVER  
RELAY (HEAT)  
2
8
9
SYSTEM  
SWITCH  
C1  
CHANGEOVER  
RELAY (COOL)  
EM.HT.  
HEAT  
O
C1 ANTICIPATOR  
10  
OFF  
X2  
Y1  
COMPRESSOR  
CONTACTOR 1  
COOL  
C2 ANTICIPATOR  
11  
RISE  
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.  
M6999  
Fig. 9. T874W/Q674L for three-stage heat and two-stage cool with outdoor reset.  
¿
T874Q only: Set the heat anticipator indicators to  
Mounting the Thermostat  
the respective current setting for each stage. See  
Setting the Heat Anticipator section. T874H and  
T874W have fixed anticipation; the settings are  
preselected and cannot be adjusted.  
³
Remove the thermostat cover by pulling the bottom  
edge of the cover upward until it snaps free of the  
cover clip.  
´
²
Note the tabs along the top inside edge of the  
thermostat base. The tabs fit into the subbase  
notches. Mount the thermostat base on the subbase  
and tighten the captive mounting screws. See Fig. 1.  
Place the upper edge of the thermostat cover on the  
thermostat base and swing the cover downward until  
it engages with the cover clip on the base.  
NOTE: The cover is hinged at the top and must be  
removed by pulling up at the bottom.  
·
»
Carefully remove and discard the polystyrene  
packing insert that protects the mercury switches  
during shipment.  
Turn over the thermostat base and note the spring  
fingers that engage the subbase contacts. Make  
sure the spring fingers are not bent flat, preventing  
proper electrical contact with the subbase.  
69-0087—6  
6
firealarmresources.com  
GeneralDetails
NameHoneywell T874H Multistage Thermostat Instruction Manual
MakeHoneywell
LanguageEnglish
FiletypePDF (Download)
File size0.19 MB
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Honeywell T874H Multistage Thermostat Instruction Manual