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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT
5 62-3070—03
Fig. 12. Typical hookup of single transformer
multistage system (up to 2H/2C).
Fig. 13. Typical hookup of dual transformer multistage
system (up to 2H/2C).
M22786A
HEAT RELAY 2
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
COOL RELAY 1
HEAT RELAY 1
COOL RELAY 2
Y2
L
A
W2
S1
S2
2
RC
R
W
Y
G
C
L1
(HOT)
L2
1
24 VAC
ECONOMIZER
M22787A
HEAT RELAY 2
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
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
COOL RELAY 1
HEAT RELAY 1
COOL RELAY 2
Y2
L
A
W2
S1
S2
2
RC
R
W
Y
G
C
L1
(HOT)
L2
1
24 VAC
L1
(HOT)
L2
1
24 VAC
ECONOMIZER