Mounting Thermostat To Wallplate - Honeywell T8400C Installation Instructions Manual

T8400C ELECTRONIC THERMOSTAT
FAN
RELAY
COMPRESSOR
CONTACTOR
1
L1
(HOT)
L2
COOLING
TRANSFORMER
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2 REMOVE RC TO R JUMPER WHEN INSTALLED ON A TWO TRANSFORMER
SYSTEM.
3
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
PUMP SYSTEMS.
4
POWER TO R TERMINAL IS REQUIRED WHEN THE SYSTEM SWITCH IS IN
THE OFF POSITION.
Fig. 7. Typical hookup of T8400C in heat-cool system
with two transformers.
G
Rc
3
R
W
Y
1
HEAT
L1
RELAY
(HOT)
24V
L2
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2 CAN BE USED FOR CHANGEOVER VALVE ON
SINGLE-STAGE HEAT PUMP SYSTEMS.
3
FACTORY INSTALLED JUMPER.
Fig. 8. T8400C in one-stage heat, one-stage cool
wiring diagram with manual changeover.
69-1493–1
G
Rc
R
2
4
W
B
Y
O
3
3
COOL
HEAT
DAMPER
DAMPER
HEAT
RELAY
HEATING
TRANSFORMER
2
HEAT
CHANGEOVER
B
2
COOL
CHANGEOVER
O
COOL FAN
RELAY RELAY
M13277A

Mounting Thermostat to Wallplate

1. Engage the tabs at the top of the thermostat and
wallplate.
2. Swing down the thermostat and press the lower
edge of the thermostat onto the wallplate to latch.
See Fig. 9.
1
L1
(HOT)
L2
A
ENGAGE TABS AT TOP OF THERMOSTAT
M12562
WITH SLOTS ON MOUNTING PLATE.
Fig. 9. Mounting thermostat to wallplate.
4
DASHED LINES INDICATE TABS
ON BACK OF THERMOSTAT
S e t
R o o m
B
PRESS LOWER EDGE OF
CASE TO LATCH.
M14677A