Honeywell TB7220U Installation Instructions Manual page 5

1
L1
(HOT)
24 VAC
L2
COOL RELAY 1 COOL RELAY 2
FAN RELAY
HEAT RELAY 1
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3
WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL.
Fig. 11. Typical hookup of single transformer
multistage system (up to 2H/2C).
3
C W2
Y2
G
Y
S1
W
S2
RC
2
R
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
HEAT RELAY 2
TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT
1
L1
(HOT)
24 VAC
L2
COOLING
TRANSFORMER
1
L1
(HOT)
24 VAC
L2
HEATING
TRANSFORMER
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
M23058 REMOVE FACTORY INSTALLED JUMPER.
3
WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL. WHEN USED, THE COMMON MUST CONNECT
TO THE COOLING TRANSFORMER SECONDARY.
Fig. 12. Typical hookup of dual transformer multistage
5
3
C
G
Y
W
RC
2
R
FAN RELAY
COOL RELAY 1 COOL RELAY 2
HEAT RELAY 1
system (up to 2H/2C).
W2
Y2
S1
S2
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
HEAT RELAY 2
M23059
62-0223—1