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Figure 9: Air Conditioning or Heat Pump Schematic 543-0032-00
Figure 10: Air Conditioning or Heat Pump Schematic 543-0033-02, 943-0033-00
WARNING
Solid Line shows field
installed wiring.
Dashed line shows thermostat
demand wiring in system without
HTCO, LPCO and Defrost.
Comfort Alert
Diagnostics Module
543-0032-00
Y
L
R
C
HTCO High Temperature Cut Out Switch
HPCO High Pressure Cutout Switch
LPCO Low Pressure Cut Out Switch
Solid Line shows field
installed wiring.
Dashed line shows thermostat
demand wiring in system without
HTCO, LPCO and Defrost.
Y2
Comfort Alert
Diagnostics Module
543-0033-00
Y
L
R
C
HTCO High Temperature Cut Out Switch
HPCO High Pressure Cutout Switch
LPCO Low Pressure Cut Out Switch
Hazardous voltage inside air conditioning system. Discon-
nect power before installing or servicing module. Module
must be installed and serviced only by qualified personnel.
LPCO
HPCO
C
R
Indoor Unit
Terminal Block
C
R
Single Stage Indoor Thermostat
Schematic Abbreviation Description
CC Compressor Contactor
ECB Electronic Control Board
( Defrost Board )
HPCO
C
R
Ultra Tech
Solenoid
C
R
Indoor Unit
Terminal Block
2nd Stage Indoor Thermostat
Schematic Abbreviation Description
CC Compressor Contactor
ECB Electronic Control Board
( Defrost Board )
7
HTCO
ECB
L
Y1
L
Y1
LPCO
HTCO
ECB
L
Y1
L
Y1
Y2
Y2
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