User`s manual

Note: 24VAC power wiring is not required for 2 wire Comfort Alert, which is

available it should not be connected. Refer to Figure 7.

Thermostat Demand Wiring

Comfort Alert requires a thermostat demand signal to operate properly. The thermostat

demand signal input, labeled Y on the module, should always be connected to the

compressor contactor coil so that when the coil is energized, the demand signal input

is 24VAC. When thermostat demand is not present, Y should be less than 0.5VAC.

NOTE: Factory installed modules may have different thermostat demand signal

wiring. Follow manufacturer’s wiring instructions when replacing

module.

NOTE: After the thermostat demand signal is connected, verify R and C are

phased properly by measuring 24VAC across Y and C when demand is

present (except 543-0010-01, 943-0010-01).

Figure 6: Air Conditioning Schematic 543-0010-00, 943-0010-00

Solid Line shows field

Dashed line shows thermostat

Comfort Alert

LPCO HTCO

HPCO

Indoor Unit

HTCO High T emperatu re Cut Out Switch

HPCO High Pressure Cutout Switch

LPCO Low Pressure Cut Out Switch

Schematic Abbreviation Description

CC Compr esso r Cont a ctor

Single Stage Indoor Thermostat

inst alled w iring.

demand wiring in system without

HTCO, LPCO.

Diagnostics Module

543-0010-00

Terminal Block

CRY1