Nordyne Two Stage R-410A Split System User's Information/Installation Instructions page 9

NOTE: This module does not provide safety
protection! The Comfort Alert
monitoring device and cannot control or shut
down other devices.
LED Description (See Figure 1)
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. The ALERT LED will fl ash a number
of times consecutively, pause and then repeat
the process. The number of consecutive
fl ashes, defi ned as the Flash Code, correlates
to a particular abnormal condition. Detailed
descriptions of specifi c ALERT Flash Codes are
shown in Table 1 of this manual.
TRIP LED (Red): indicates there is a demand
signal from the thermostat but no current to the
compressor is detected by the module. The TRIP
LED typically indicates the compressor protector
is open or may indicate missing supply power
to the compressor.
The scroll compressor's run (R), common (C) and
start (S) wires are routed through the holes in
TM
the Comfort Alert module marked "R," "C" and
"S." The common (C) need not be routed through
the module for it to operate properly.
24 VAC Power Wiring — The Comfort Alert
TM
module is a
module requires a constant nominal 24 VAC
power supply. The wiring to the module's R and
C terminals must be directly from the indoor unit
or thermostat. The module cannot be powered by
the C terminal on a defrost board or other control
board without experiencing nuisance alerts.
When 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 Comfort
Alert
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 24 VAC when the coil
is not energized, the demand signal input should
be less than 0.5 VAC.
NOTE: Factory installed modules have differ-
ent thermostat demand signal wiring. Follow
manufacturer's wiring instructions when replac-
ing module.
NOTE: After the thermostat demand signal is
connected, verify that 24 VAC across Y and C
when demand is present.
POWER
ALERT
TRIP
Figure 2. Comfort Alert
Module
TM
module requires a thermostat demand
TM Diagnostics
TM
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