GPG16M Installation Instructions

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PRIMARY LIMIT
A primary limit will open due to excessive supply air temperatures. This can be caused by a dirty filter, excessive duct static, insufficient
air flow, or a faulty limit. Check filters, total external duct static, blower motor, blower motor speed tap (see wiring diagram), and
limit. This limit will automatically reset once the temperature falls below a preset level.
If a limit switch opens, the gas valve is immediately de-energized, the induced draft and air circulating blowers are energized. The
induced draft and air circulator blowers remain energized until the limit switch re-closes. The diagnostic LED (red) code for an open
limit is four (4) flashes.
NOTE: If the primary limit opens five (5) times within the same call for heat, the ignition control will lock out for one (1) hour with the
air circulating blower energized at high heat speed. The diagnostic LED (red) code for this condition is seven (7) flashes.
FLAME DETECTED WITH GAS VALVE CLOSED
If flame is detected with the gas valve de-energized, the combustion and air circulator blowers are energized. The diagnostic fault code
is five (5) flashes (red LED) for this condition. The flame diagnostic LED (amber) will flash (2) times to indicate this condition. The
control can be reset by removing the power supply to the unit or it will automatically reset after one hour. Miswiring is the probable
cause for this fault.
LOW FLAME SIGNAL
Under some conditions, the fuel or air supply can create a nearly invisible coating on the flame sensor. This coating acts as an insulator
causing a drop in the flame signal. If the flame signal drops below a predetermined value, the ignition control will display an error code
of (1) flash on the amber diagnostic LED. The unit will continue to operate until the control can no longer detect flame.
ABNORMAL OPERATION - COOLING
SHORT CYCLE COMPRESSOR DELAY
The automatic ignition control has a built-in feature that prevents damage to the compressor in short cycling situations. In the event of
intermittent power losses or intermittent thermostat operation, the ignition control will delay output to the compressor contactor for
three minutes from the time power is restored or thermostat call for cooling is restored. (Compressor is off a total of three minutes).
The diagnostic red LED will flash six (6) times to indicate the compressor contactor output is being delayed.
NOTE: Some electronic thermostats also have a built-in compressor short cycle timer that may be longer than the three minute delay
given above. If you are using an electronic thermostat and the compressor has not started after three minutes, wait an additional five
minutes to allow the thermostat to complete its short cycle delay time.
HIGH PRESSURE SWITCH/LOSS OF CHARGE SWITCH
Some models include a high pressure cutout switch and/or a loss of charge cutout switch. The high pressure cutout switch protects the
refrigeration system from excessive operating pressures. The loss of charge cutout switch protects the refrigeration system from very
low operating pressures due to a loss of refrigerant. Compressor operation will be disabled if either of these devices opens. If either
devices opens, the diagnostic red LED will flash (9) times to indicate that a refrigeration system pressure switch is open.
MAINTENANCE
Have the gas heating section of the unit checked at least once a year
before the heating season begins, to be sure that the combustion air
inlet and flue outlet hoods are not blocked by debris, which would
prevent adequate combustion air and a properly operating vent
system.
FILTER REPLACEMENT OR CLEANING
A return air filter is not supplied with this unit; however, there must be a means of filtering all of the return air. The filter(s) may be
located in the return air duct(s), or return air filter grille(s). Consult with your installing dealer for the actual location of the return air
filter(s) for your unit.
Dirty filters are the most common cause of inadequate heating or cooling performance. Filter inspection should be made at least every
two months; more often if necessary because of local conditions and usage.
Dirty throwaway filters should be discarded and replaced with a new, clean filter. Dirty permanent filters should be washed with water,
thoroughly dried and sprayed with a filter adhesive before being reinstalled. (Filter adhesives may be found at many hardware stores.)
Permanent filters should last several years. However, should one become torn or uncleanable, it should be replaced.
CABINET FINISH MAINTENANCE
Use a fine grade automotive wax on the cabinet finish to maintain the finish’s original high luster. This is especially important in
installations with extended periods of direct sunlight.
CLEAN OUTSIDE COIL (QUALIFIED SERVICER ONLY)
The coil with the outside air flowing over it should be inspected annually and cleaned as frequently as necessary to keep the finned areas
free of lint, hair and debris.