Emerson Comfort Alert 543-0033-00 - Diagnostics and Troubleshooting; Interpreting Diagnostic LEDs; Installation Verification and Miswiring

7
Interpreting The Diagnostic LEDs
When an abnormal system condition occurs, the Comfort Alert module displays the
appropriate ALERT and/or TRIP LED. The yellow ALERT 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. Every time the module powers
up, the last ALERT Flash Code that occurred prior to shut down is displayed for one
minute.
Installation Verifi cation
To verify the installation of Comfort Alert is correct, two functional tests can be performed.
Disconnect power from the compressor and force a thermostat call for cooling. The red
Trip LED should turn on indicating a compressor trip as long as 24VAC is measured at
the Y terminal. If the red LED does not function as described, refer to
Table 1
to verify
the wiring.
Disconnect power from the compressor and 24VAC from Comfort Alert. Remove the
wire from the Y terminal of Comfort Alert, reapply 24VAC power to Comfort Alert and
reconnect power to the compressor. Force a thermostat call for cooling and when the
Compressor starts to run, the yellow Alert LED will begin fl ashing a Code 8 indicating
a Welded Contactor. Disconnect power from the compressor and 24VAC from Comfort
Alert. While Comfort Alert is off, reattach the wire to the Y terminal. Reapply power to
compressor and 24VAC to Comfort Alert, the yellow Alert LED will fl ash the previous
code 8 for 1 minute and then turn off. If the yellow LED does not function as described,
refer to
Table 1
to verify the wiring.
Troubleshooting The Installation
Depending on the system confi guration, some ALERT Flash codes may not be active.
The presence of safety switches affects how the system alerts are displayed by this
module. Refer to
Figures 4 & 5
for safety switch wiring.
Resetting Alert Codes
Alert codes can be reset manu
ally and automatically. The manual method to reset an Alert
code is to cycle the power to Comfort Alert off and on.
For automatic reset, Comfort Alert
continues to monitor the compressor and system after an Alert is detected. If conditions
return to normal, the Alert code is turned off automatically.
Com
fort Alert Part Numbers
OEM P/N
Service P/N
Copeland Scroll Compressor Application
543-0010-00
943-0010-00
Single Stage Air Conditioning
543-0012-00
943-0012-00
All Heat Pump and Two Stage A/C
543-0032-00
943-0032-00
Single Stage A/C & Heat Pump
543-0033-00
943-0033-00
Two Stage A/C & Heat Pump