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
| 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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