Справочник Пользователя для Nordyne R-410A

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again after the discharge pressure decreases to 
460 psig. NOTE: When the switch opens and 
then closes, there will be a 3 minute short cycling 
delay before the outdoor unit will energize. Under 
normal conditions the switch is closed.

The Comfort Alert

TM

 Diagnostics Module is a 

breakthrough innovation for troubleshooting 
heat pump and air conditioning system failures. 
The module installs easily in the electrical box of 
the outdoor unit near the compressor contactor. 
By monitoring and analyzing data from the 
Copeland scroll compressor and the thermostat 
demand, the module can accurately detect the 
cause of electrical and system related failures 
without any sensors. A fl ashing LED indicator 
communicates the ALERT code and a diagnostic 
key is also imprinted on the side of the module 
to quickly direct the technician to the root cause 
of a problem. See Figure 3.

NOTE:  This module does not provide safety 
protection! The Comfort Alert

TM

 Diagnostics 

Module is a monitoring device and cannot control 
or shut down other devices.

24 VAC Power Wiring
The Comfort Alert

TM

 module requires a constant 

nominal 24 VAC power supply. The module cannot 
be powered by the C terminal on a defrost board 
or other control board without experiencing 
nuisance alerts. NOTE: The wiring to the module’s 
R & C terminals must be routed directly from the 
indoor unit or thermostat.

If the constant 24 VAC (R wire) is not present in 
the outdoor unit, use one of the spare wires in the 
thermostat cable to bring power to the module. 
Connect the other end of the spare wire to R at 
the indoor unit or thermostat.

Thermostat Demand Wiring
The Comfor t Aler t

TM

 module 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. NOTE: When the 
coil is energized, the demand signal input is 24 
VAC. When the coil is not energized, the demand 
signal input should be less than 0.5 VAC.

•  Factory installed modules have different 

thermostat demand signal wiring. Always 
follow manufacturer wiring instructions when 
replacing the module.

•  After the thermostat demand signal is 

connected, verify that 24 VAC across Y & C 
when demand is present.

Interpreting the Diagnostic LED’s
When an abnormal system condition occurs, the 
Comfort Alert

TM

 module displays the appropriate 

ALERT and/or TRIP LED will fl ash a number of 
times consecutively, pause and then repeat the 
process. To identify a Flash Code number, count 
the number of consecutive fl ashes.

Each time the module powers up, the last ALERT 
Flash Code that occurred prior to shut down 
is displayed for one minute. The module will 
continue to display the LED until the condition 
returns to normal or if 24 VAC power is removed 
from the module.

LED Description
•  POWER LED (Green): indicates voltage is 

present at the power connection of the module.

•  ALERT LED (Yellow): communicates an 

abnormal system condition through a unique 
fl ash code.  NOTE: The ALERT LED will fl ash 
consecutively, pause and then repeat the 
process. The number of consecutive fl ashes, 
referred to as the Flash Code, correlates to 
a particular abnormal condition. Detailed 
descriptions of these ALERT Flash Codes 
are listed in Table 4 (page 14).

•  TRIP LED (Red): indicates a demand signal 

is received from the thermostat, but current 
to the compressor is not detected by the 
module. The TRIP LED typically indicates 
if the compressor protector is open or the 
compressor has no power.

The scroll compressor’s R (run), C (common), 
and S (start) wires are routed through the holes in 
the Comfort Alert

TM

 module marked R, C, and S. 

NOTE: The common wire does not need to be 
routed through the module for it to operate.

(Green)

(Red)

(Yellow)