Carrier 33CS250-01 - Page 8

8
L
L
2
3
L
1
L
1
L
3
L
2
A
B
C
SITE
POWER
24 VAC
UNIT WITH
TRANSFORMER
ON L AND L
3
2
24 VAC
UNIT WITH
TRANSFORMER
ON L AND L
2
1
110 VAC
TIMECLOCK
TRANSFORMER
ISOLATION
RELAY
COIL
THERMOSTAT
THERMOSTAT
THERMOSTAT
CK1
CK2
CK1
CK1
CK2
CK2
NOTE: Additional relays may be used. Relay coils must be connected in parallel.
Fig. 8 — Typical Dry Contact Switch Wiring
Fig. 9 — Example of Unit Phasing
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