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T7350 Commercial Programmable Thermostat
63-2605—06
28
Fig. 19. Typical hookup of T7350B in three-stage heat and two-stage cool heat pump system
with two transformers.
Fig. 20. Typical hookup of T7350D in three-stage heat and three-stage cool conventional system with one transformer.
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
WHEN INSTALLED ON A SYSTEM WITH TWO TRANSFORMERS, REMOVE THE FACTORY-INSTALLED JUMPER.
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.
1
M32142
2
2
3
RCX O/B GY1
W2 Y2
AUX
RH
DISCHARGE
AIR
SENSOR
OUTDOOR
AIR
SENSOR
OSOS ASAS
1
3
L1
(HOT)
L2
1
L1
(HOT)
L2
COMPRESSOR
CONTACTOR 1
COMPRESSOR
CONTACTOR 2
HEATING
TRANSFORMER
COOLING
TRANSFORMER
CHANGE
OVER
FAN
RELAY
ECONOMIZER
AUX HEAT
STAGE 1
SUBBASE
T5 T6 T7 T4 T3
TR23 REMOTE SENSOR
9
8
76
5
4
3
21
10
11
12
GND
SENSOR
SET PT
LED
BYPASS
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
ENSURE TRANSFORMER IS SIZED TO HANDLE THE LOAD.
HEAT/COOL SYSTEMS WITH ONE TRANSFORMER REQUIRE THE FACTORY-INSTALLED JUMPER.
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.
NO NEED TO WIRE HC TERMINAL BECAUSE THE T3 TERMINAL IS INTERNALLY TIED TO HC, WHICH IS ALSO TIED
TO TERMINAL 1 COMMON AT THE SENSOR.
1
M29255
2
3
2
3
4
RC
AUX
X
SUBBASE
W1 GY1
W3/Y4 Y3 W2 Y2
AUXRH
T5 T6 T7 T4 T3
DISCHARGE
AIR
SENSOR
OUTDOOR
AIR
SENSOR
MOTION
SENSOR
HUMIDITY
SENSOR
M
OSOS ASAS
MHC HPHS
1
4
L1
(HOT)
L2
COMPRESSOR
CONTACTOR 1
COMPRESSOR
CONTACTOR 2
HEAT
RELAY 1
FAN
RELAY
ECONOMIZER
HEAT
RELAY 2
COMPRESSOR
CONTACTOR 3
HEAT
RELAY 3
TR23-H REMOTE SENSOR
9
8
76
5
4
3
21
10
11
12
GND
SENSOR
SET PT
LED
BYPASS
5