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T7200/T7300/Q7300
WIRING DIAGRAMS
Fig. 42—T7300/Q7300C,D with economizer package in 2-stage heat/1 stage cool heat pump system defeating
economizer minimum position during unoccupied period.
T7300
THERMOSTAT
SYSTEM
SWITCH
C1
H1
FAN
AUXILIARY
RELAY
CONTACTS
63-4038—7
Q7300 HEAT PUMP SUBBASE
R
X
CO
RED
B
RED
CO
O
E
EM. HT
HEAT
OFF
COOL
AUTO
Y1
W1
G
MODUTROL
A1
A2
A3
7
6
COM
LED1
LED2
4K
4
EXISTING HVAC EQUIPMENT
HVAC EQUPIMENT
TERMINAL STRIP
R
C
4
G
5K
O
W1
Y
EXISTING ECONOMIZER CONTROL PACKAGE
MIXED AIR
TEMPERATURE
CONTROLLER
MOTOR
BLUE
B1
W
R
B
RISE
W1
R1
YELLOW
T2
W
R
B
T1
OPEN
MINIMUM POSITION
POTENTIOMETER
RED
4K1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
5K1
1
OVERLOAD PROTECTION AS REQUIRED. 24 VAC SECONDARY.
MUST BE ABLE TO CARRY ADDITIONAL 6 VA LOAD OF
2
THERMOSTAT AND SUBBASE.
3
ENTHALPY CONTROL MAKES TERMINALS 2-1 ON ENTHALPY
1
RISE AND 2-3 ON ENTHALPY FALL.
L1
L2
(HOT)
4
RELAY REQUIRED (R8222 OR SIMILAR).
5
ECONOMIZER MOTOR SPRING RETURNS CLOSED ANYTIME
FAN IS NOT RUNNING.
24 VAC ONLY.
6
A3 TERMINAL AVAILABLE ON Q7300D MODEL ONLY.
7
40
L1
(HOT)
2
1
3
1
2
3K
7K
4
5
FAN
RELAY
4K
4
REV.
VALVE
AUXILIARY
HEAT 1
4K1
COMP
4K2
5K1
4
3K1
BLACK
1K1 1K2
OUTDOOR AIR
CHANGEOVER
SWITCH
1K
VIOLET
VIOLET
L2
M4412
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