Publicidad
24VAC Power Wiring
The Comfort Alert module requires a constant nominal 24VAC power supply.
The wiring to the module's R and C terminals must be directly from the control
transformer. The module cannot receive its power from another device that will
interrupt the 24VAC power supply. Refer to wiring schematics in Figures 4, 5 and 6.
Thermostat Demand Wiring
The Comfort Alert module requires a thermostat demand signal to operate properly. The
thermostat demand signal input, labeled Y on the module, should be connected directly
to the compressor contactor coil so that when the coil is energized, the demand signal
is 24VAC. When the coil is not energized, the demand signal input should be less than
0.5VAC. Refer to wiring schematic in Figure 4.
An alternate thermostat wiring approach is to connect the demand signal directly to the
Comfort Alert and allow the module to control the contactor directly. Allowing Comfort
Alert to control the contactor directly will prevent voltage drops in long thermostat wire
runs. Refer to wiring schematic in Figure 5.
NOTE: Factory installed modules may have different thermostat demand signal
wiring. Follow manufacturer's wiring instructions when replacing module.
System Controller Demand Wiring
The Comfort Alert module can also be connected to a system controller refer to Figure
6 for wiring schematics. The PROT terminal may be monitored by the controller instead
of providing protection if the controller shuts down the compressor on severe Alerts.
The 10kohm resistor must be added externally and forces the controller input to 24VAC
when the PROT terminal is open. When the PROT terminal is closed, the controller
input will be 0VAC.
NOTE: After the thermostat demand signal is connected, verify Y is phased
properly with C by measuring 24VAC across Y and C when demand is present.
Thermostat Second Stage Cooling Wiring
(Not applicable to single stage models 543-0038-02 and 943-0038-02)
For two stage applications, the Comfort Alert module requires a two stage thermostat
to operate properly. The Y2 thermostat wire should be connected to the Y2 input on
Comfort Alert.
While the compressor is running, Comfort Alert will provide power to the second stage
cooling solenoid inside the compressor after Y2 has been energized for 5 seconds.
Whenever the compressor is not running, Comfort Alert will not power the solenoid,
regardless of the state of Y2.
4
Publicidad
