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Design Superheat & Subcool
Superheat
Model
±2°F
*PGM324***41
7
*PGM330***41
4
*PGM336***41
5
*PGM342***41
7
*PGM348***41
15
*PGM361***41
6
Cooling Operation
1. Turn on the electrical power supply to the unit.
2. Place the room thermostat selector switch in the
3. Set the room thermostat to the desired temperature.
TROUBLESHOOTING
The following presents probable causes of questionable
unit operation. Refer to Diagnostic Indicator Chart for
an interpretation of the signal and to this section for an
explanation.
Remove the control box access panel and note the number
Chart for an interpretation of the signal and to this section
for an explanation.
The ignition control is equipped with a momentary
push-button switch that can be used to display on the diag-
use the feature. Depress the push-button switch for approx-
imately 2 seconds. NOTE: Do not hold for longer than 4
seconds. Holding the button for 4 seconds or higher
will erase the memory! Release the switch when the
The diagnostic LED will then display
The order of display is the most recent fault to the least
recent fault.
Internal Control Failure
If the integrated ignition control in this unit encounters an
diagnostic LED. If diagnostic LED indicates an internal
fault, check power supply to unit for proper voltage, check
all fuses, circuit breakers and wiring. Disconnect electric
power, replace control.
Subcooling
Expansion
Cooling
±1°F
Device
Stage
-
Piston
high
-
Piston
high
-
Piston
high
-
Piston
high
-
Piston
high
8
TXV
low
External Lockout
An external lockout occurs if the integrated ignition control
Outdoor
Ambient
determines that a measurable combustion cannot be estab-
(°F )
95
95
tion, the gas valve is de-energized, 15 second inter-purge
95
cycle is completed, and ignition is reattempted. The control
95
will repeat this routine three times if a measurable com-
95
82
induced draft blower and go into a lockout state.
-
the circulator blower at the heat speed and then begin a
locking out.
control will automatically reset after one hour, or it can be
reset by removing the thermostat signal or disconnecting
diagnostic LED indicates an external lockout, perform the
faulty limit, or a failed circulator blower can cause this limit
a heating cycle may also cause the auxiliary limit to open.
The automatic reset secondary limit is located on top of the
circulator blower assembly.
blocked or cracked heat exchanger, a failed induced draft
device is a manual reset limit located on the burner brack-
corrected before resetting the limit.
coating on the sensor. Remove the sensor and carefully
clean with steel wool.
Check wiring for opens/shorts and miswiring.
IMPORTANT:
21
-
-
-
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