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When an abnormal system condition occurs, the Comfort Alert module displays the
appropriate ALERT and/or TRIP LED. The yellow ALERT 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.
IMPORTANT: Every 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 flash code until the condition returns to normal or if 24VAC power is
removed from the module.
The control box cover allows access to the Comfort Alert™ status LEDs. An abbre-
viated Comfort Alert™ diagnostic chart is provided on the control box cover.
2. High Pressure Control (HPC)
The high pressure control (HPC) keeps the compressor from operating in pressure rang-
es, which can cause damage to the compressor. This is an auto-reset control that opens
near 610 PSIG and closes once the system pressure drops below 420 PSIG.
The high pressure control is wired in the 24VAC side of the control circuitry.
3. Low Pressure Control (LPC)
The low pressure control (LPC) keeps the compressor from operating in pressure rang-
es that can cause damage to the compressor. This is an auto-reset control that opens
near 90 PSIG and closes once the system pressure rises above 135 PSIG.
The low pressure control is wired in the common side of the control circuitry.
4. Comfort Alert With Active Protection
A two-stage cooling thermostat is required for proper unit operation.
Manufacturer recommends the use of thermostats that provide active compressor pro-
tection via the L terminal when the Comfort-Alert module on the unit is connected to the
L terminal on the thermostat.
The Comfort Alert diagnostics module diagnoses system and electrical problems in the
air conditioning system. Abnormal conditions are indicated by flashing ALERT codes
on the yellow LED on the Comfort Alert module. The flash codes are transmitted to the
thermostat when the L terminal on the Comfort Alert Module is connected to the L termi-
nal on the thermostat. The compatible thermostat displays a CHECK SYSTEM icon that
flashes at the same rate as the yellow ALERT LED on the Comfort Alert module.
NOTE: The Comfort Alert™ module does not provide safety protection! It does not dis-
FIGURE 2
connect power from the unit.
Comfort Alert™ Flash Codes
1 – Long Run Time
2 – System Pressure Trip
3 – Short Cycling
4 – Locked Rotor
5 – Open Circuit
6 – Open Start Circuit (Single Phase) – Missing Phase (3-Phase)
7 – Open Run Circuit (Single Phase) – Reverse Phase (3-Phase)
8 – Welded Contactor
9 – Low Voltage
See Figure 32 and 33 (Comfort Alert Diagnostic Charts) for more troubleshooting infor-
mation.
6
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