TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT
62-3070—07 4
Conventional System Wiring
Fig. 7. Typical wiring of single transformer
1H/1C system.
Fig. 8. Typical hookup of dual transformer
1H/1C system.
Fig. 9. Typical hookup of heat-only system.
Fig. 10. Typical hookup of heat-only system with fan.
Fig. 11. Typical hookup of cool-only system.
COMPRESSOR CONTACTOR
M22781A
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
HEAT RELAY
ECONOMIZER
FAN RELAY
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
FACTORY INSTALLED JUMPER.
WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL.
1
2
3
Y2
L
A
W2
S1
S2
2
3
RC
R
W
Y
G
C
L1
(HOT)
L2
1
24 VAC
COMPRESSOR CONTACTOR
M22782A
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
HEAT RELAY
FAN RELAY
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
REMOVE FACTORY INSTALLED JUMPER.
WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL. WHEN USED, THE COMMON MUST CONNECT
TO THE COOLING TRANSFORMER SECONDARY.
1
3
2
3
2
Y2
L
A
W2
S1
S2
2
RC
R
W
Y
G
C
ECONOMIZER
L1
(HOT)
L2
1
24 VAC
L1
(HOT)
L2
1
24 VAC
M22783A
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
HEAT RELAY
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
FACTORY INSTALLED JUMPER.
WHEN USING BATTERIES, THE 24V COMMON CONNECTION IS
OPTIONAL.
1
3
2
3
2
L1
(HOT)
L2
1
24 VAC
Y2
L
A
W2
S1
S2
2
RC
R
W
Y
G
C
ECONOMIZER
M22784A
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
HEAT RELAY
FAN RELAY
ECONOMIZER
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
FACTORY INSTALLED JUMPER.
WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL.
1
2
3
3
Y2
L
A
W2
S1
S2
2
RC
R
W
Y
G
C
L1
(HOT)
L2
1
24 VAC
M22785A
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
FAN RELAY
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
FACTORY INSTALLED JUMPER.
WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL.
1
3
2
3
COMPRESSOR CONTACTOR
Y2
L
A
W2
S1
S2
2
RC
R
W
Y
G
C
L1
(HOT)
L2
1
24 VAC
ECONOMIZER
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