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THERMOSTAT
R
M
G
TRANS
IFR
C
Y
COOLING ONLY
THERMOSTAT
FAN COIL
R
R
C
G
G
Y
Y
W
W2
ONE STAGE COOLING / ELECTRIC HEAT
NOTES:
1. Wiring must conform to local codes.
2. LLS required on some units. See specific unit instructions.
3. Transformer required is 24-v, 40-va minimum. A 60-va or external power source may
be necessary when installing accessories.
4. When installing electronic thermostat, connect transformer common to thermostat C.
LEGEND:
C
– COMPRESSOR CONTACTOR
LLS
– LIQUID LINE SOLENOID
Fig. 5—24-v Control Circuit Connections
THERMOSTAT
R
MOTOR
POWER
SUPPLY
G
Y
W
ONE STAGE COOLING / GAS HEATING
THERMOSTAT
R
C
G
Y
W
ONE STAGE COOLING / HEATING
ACCESSORY LIQUID LINE SOLENOID
M
– INDOOR FAN MOTOR
TRANS
– TRANSFORMER
IFR
– INDOOR FAN RELAY
5
FURNACE
R
C
G
C
Y
W /
W1
INDOOR UNIT
R
C
G
LLS
Y
W
C
A94331
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