Product Overview

SEALED UNIT PARTS CO., INC.
P.O. Box 21, 2230 Landmark Place, Allenwood, N.J. 08720
[phone] • Fax [phone]
www.supco.com • [e-mail]
SFPC Freeze Protection Control
The SUPCO Freeze Protection Control, Model SFPC, is a low cost
control designed to protect the air conditioning coil from freezing.
The SFPC is installed by simply snapping it onto the suction line
just outside the evaporator coil. When the SFPC senses tempera-
ture at 38 °F it breaks the circuit to the
compressor relay, preventing a freeze up. The SFPC then remakes
the compressor circuit at 48 °F allowing ample time for the com-
pressor to be off. This differential prevents any short cycling.
During the period that the compressor is off the fan is still run-
ning, using the cold coil to provide air condidtioning.
Fan Relay
Thermostat
Wiring Diagram
Heat Relay
SFPC
RC
W
Y
G
W
G
Y
RC
C
24 V Transformer
PRODUCT DATA
P/N 18774
SEALED UNIT PARTS CO., INC.
P.O. Box 21, 2230 Landmark Place, Allenwood, N.J. 08720
[phone] • Fax [phone]
www.supco.com • [e-mail]
SFPC Freeze Protection Control
The SUPCO Freeze Protection Control, Model SFPC, is a low cost
control designed to protect the air conditioning coil from freezing.
The SFPC is installed by simply snapping it onto the suction line
just outside the evaporator coil. When the SFPC senses tempera-
ture at 38 °F it breaks the circuit to the
compressor relay, preventing a freeze up. The SFPC then remakes
the compressor circuit at 48 °F allowing ample time for the com-
pressor to be off. This differential prevents any short cycling.
During the period that the compressor is off the fan is still run-
ning, using the cold coil to provide air condidtioning.
Fan Relay
Thermostat
Wiring Diagram
Heat Relay
SFPC
RC
W
Y
G
W
G
Y
RC
C
24 V Transformer
PRODUCT DATA
P/N 18774