Vac Power Wiring; Thermostat Demand Wiring; Interpreting The Diagnostic Led's; Led Description - Nordyne R-410A Installation And User Manual

TM
Comfort Alert Diagnostics Module
TM
The Comfort Alert diagnostics module is a
breakthrough innovation for troubleshooting 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 Comfort Alert
provide safety protection! This module is a
monitoring device and cannot control or shut
down other devices.

24 VAC Power Wiring

TM
The Comfort Alert 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

TM
The Comfor t Aler t
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
POWER LED
(Green)
ALERT LED
(Yellow)
TRIP LED
(Red)
Figure 3. Comfort Alert
Module
10
TM
module does not
module requires a
Diagnostics
Key
TM Diagnostics
VAC. When the coil is not energized, the demand
signal input should be less than 0.5 VAC.
NOTES:
• 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 module's power connection.
• ALERT LED (Yellow): communicates an
abnormal system condition through a
unique fl ash code. 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
the compressor protector is open or may be
missing supply power to the compressor.
The scroll compressor's R (run), C (common),
and S (start) wires are routed through the holes in
TM
the Comfort Alert module marked R, C, and S.
NOTE: The common wire does not need to be
routed through the module for it to operate.
2-Speed Outdoor Fan Motor (Select Models)
If unit uses a 2-speed condenser fan motor, this
motor will operate on low speed when in low
cooling, and on high speed when in high cooling.
A relay within the control area switches the fan
motor from low to high speed using the call for
high cooling as the trigger.