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PROT Terminal
The PROT terminal provides the compressor protection functionality for Comfort Alert.
If a compressor damaging code is active, the PROT terminal interrupts the common
leg of the compressor contactor coil. This terminal is rated for a maximum of 1 Amp (24
VA) and is only compatible with AC coils. The compressor contactor coil must use the
same supply voltage as the Comfort Alert power supply, "R" and "C".The PROT terminal
will allow the compressor contactor to be energized whenever demand "Y" is present,
no alert codes are present and the anti-short cycle timer (3 minutes) is not active. The
PROT terminal will force the compressor contactor to be deenergized whenever "Y" is
not present. Certain Alert codes will trip and/or lock out the compressor if the condition
is serious and no cooling is being provided. The anti-short cycle timer is active on every
compressor shut down. If the demand "Y" is present while the timer is still active, the
PROT terminal will keep the compressor contactor from energizing until the timer is
complete. The red TRIP LED will fl ash while the compressor is held off.
Safety Cutout Devices
The Comfort Alert protection is not a substitute for safety cutout protective devices. For
best troubleshooting results automatic reset cutout switches should be used. Comfort
Alert monitors patterns of behavior and will protect the system and provide diagnostics
when multiple cutout events are detected.
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. If the
yellow ALERT LED is on solid, more than 2 amps are conducted through the PROT
terminal. The contactor coil may be shorted or the PROT terminal miswired.
Some ALERT codes indicate a compressor damaging condition and the Comfort Alert
module will shut down and lock out the compressor. Refer to the tables on pages 8 and 9
to identify ALERT codes that result in a lock out.
Installation Verifi cation for Model 543-0038-00
To verify the installation of Comfort Alert is correct, a functional test can be performed.
Force a call for cooling. The compressor will not immediately begin to run. This is due to
the anti short cycle timer. The anti short cycle time lasts for 3 minutes, and is indicated
by fl ashing the Trip LED. After the anti short cycle timer expires, the compressor should
run. Monitor the ALERT and Trip LEDs. The Alert and Trip LEDs should remain off during
this portion of the test. Disconnect power to the compressor while the call for cooling is
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