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T7200/T7300/Q7300
WIRING DIAGRAMS
Fig. 38—T7300/Q7300C with 2-stage heat/1-stage cool heat pump system using O or B terminal for reversing
valve.
T7300
THERMOSTAT
H1/C1
AUX HT
FAN
63-4038—7
Q7300 HEAT PUMP SUBBASE
AUX. HT.
CO HT
EM.HT.
LED (RED)
LED (RED)
CO CL
SYSTEM
SWITCH
EM. HT
HEAT
OFF
COOL
AUTO
CA1
CA2
T7147
REMOTE
CA3
COMFORT
ADJUST
CA4
MODULE
CA5
T
AUXILIARY
T
RELAY
CONTACT
1
24 VAC SECONDARY; MUST BE ABLE TO CARRY ADDITIONAL 6 VA LOAD OF THERMOSTAT AND SUBBASE.
WIRE O TO REVERSING VALVE FOR COOLING CHANGEOVER. WIRE B TO REVERSING VALVE FOR HEATING CHANGEOVER.
2
24 VAC ONLY.
3
EXISTING HVAC EQUIPMENT
HVAC EQUIPMENT
TERMINAL STRIP
R
R
X
C
B
2
O
E
B
O
E
Y
Y1
W1
W1
G
G
COM
3
LED1
LED2
A1
ECONOMIZER
3
A2
36
SYSTEM
TRANSFORMER
L1
1
(HOT)
L2
(IF NO "C" TERMINAL)
REV.
VALVE
EM. HT.
RELAY
COMP.
AUXILIARY
HEAT
FAN
L1
(HOT)
FAN SWITCH
L2
ON
1
AUTO
M4399
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