12
Figure 6. comfort alertTm Diagnostics module
POWER LED
(Green)
TRIP LED
(Red)
ALERT LED
(Yellow)
Diagnostics
Key
these thermostats is to lock out the compressor when
certain Alert codes are detected in indicating impending
compressor damage. Refer to White-Rodgers thermostat
manuals for more information. DO NOT connect the l
terminal from the thermostat to l on the terminal block
in the unit.
Standard thermostats with an l terminal which are not
compatible with the Comfort Alert Module, can only be
connected to l on the terminal strip in the unit. The l
terminal is used for defrost board fault monitoring in these
applications.
DC SOL Connection
The two pin Dc Sol connector provides a connection to the
Copeland UltraTech second stage compressor solenoid.
This 24VDC solenoid is internal to the compressor and will
not operate properly if 24VAC is applied to the compressor
solenoid terminals.
To reduce the VA load of the solenoid on the system,
Comfort Alert uses a phase control method to reduce the
DC voltage to the solenoid to the minimum level required to
keep the solenoid pulled in. As the 24VAC supply voltage
varies, Comfort Alert intelligently changes the solenoid
DC voltage supply to minimize power consumption.
A voltmeter attached to the Dc Sol output will measure
4 - 18VDC, when solenoid should be energized, depending
on the level of the 24 VAC supply.
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 flash a number of times consecutively,
pause and then repeat the process. To identify a Flash
Code number, count the number of consecutive flashes.
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. See Table 8 (pages 22 - 23) for
flash code identification or Table 9 (page 24) for module
wiring troubleshooting.
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 flash code.
noTe: The ALERT LED will flash consecutively, pause
and then repeat the process. The number of consecutive
flashes, referred to as the Flash Code, correlates to a
particular abnormal condition. Detailed descriptions of
these ALERT Flash Codes are listed in Table 8.
•
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.
Installation Verification
To verify the Comfort Alert is correctly installed, two
functional tests can be performed.
1. Disconnect power from the compressor and force
a thermostat call for cooling. noTe: The Trip LED
(red) should turn on indicating a compressor trip as
long as 24VAC is measured at the Y terminal. If the
Trip LED does not function as described, refer to the
wiring diagram (Figure 12, page 19).
2. Disconnect power from the compressor and 24VAC
from Comfort Alert.
3. Remove the wire from Y terminal of Comfort Alert,
reapply 24VAC power to Comfort Alert and reconnect
power to the compressor.
4. Set the thermostat's system mode to COOL.
noTe: When the compressor starts to run, the Alert
LED (yellow) will begin flashing a Code 8 indicating
a Welded Contactor.
5. Disconnect power from the compressor and 24VAC
from Comfort Alert.
6. With Comfort Alert OFF, reattach the wire to the Y
terminal. Reapply power to compressor and 24VAC
to Comfort Alert. noTe: The Alert LED (yellow) will
flash the previous code 8 for 1 minute and then turn
off. If the yellow LED does not function, refer to the
wiring diagram (Figure 12).
Troubleshooting the Installation
Depending on system configuration, some ALERT Flash
codes may not be active. The presence of safety switches
affects how the system alerts are displayed by this module.
