Goodman Mfg GPG13 installation manual Troubleshooting

Dehumidification

The GE ECM motor has the capability to provide increased dehumidification during cooling operation. This is accomplished by lowering the airflow to approximately 85% of the nominal cooling airflow. Example: Unit is operating at 1400 CFM and humidistat calls for dehumidification. Resulting airflow is 0.85* 1400 CFM = 1190 CFM.

To make use of this feature, a 24VAC humidistat which opens on humidity rise is required. Connect humidistat to the HUMIDISTAT/HUM terminal on the low voltage terminal board (see wiring diagram in the appendix). Clip the HUM/ PJ6 jumper on the low voltage terminal board. The system is now ready to provide dehumidification.

Limit Check

Check limit control operation after 15 minutes of operation by blocking the return air grille(s).

1.After several minutes the main burners must go OFF. Blower will continue to run.

2.Remove air restrictions and main burners will relight after a cool down period of a few minutes.

Adjust the thermostat setting below room temperature.

1.Main burners must go OFF.

2.Circulating Air Blower will continue to run for 120, 135 or

150 seconds, depending on the setting. *PG13(48,60)***1A ONLY: Circulating Air Blower will

continue to run for 180 seconds.

COOLING STARTUP

NOTE: Check all manual reset limit controls in heating circuit if cooling mode does not operate.

Compressor Protection Devices

The compressor includes components which are designed to protect the compressor against abnormal operating conditions.

WARNING

TO PREVENT PERSONAL INJURY OR DEATH, ALWAYS DISCONNECT ELECTRICAL POWER BEFORE INSPECTING OR SERVICING THE UNIT. ALL COMPRESSOR PROTECTION DEVICES RESET AUTOMATICALLY, ENERGIZING THE CONTACTOR AND OUTDOOR FAN.

Cooling Refrigerant Charging

Check unit charge before putting the cooling section into full operation. The unit is factory charged with R-22 for nominal air flow and static pressure conditions. The unit has a piston flowrator expansion device.

NOTE: *PG1360 is equipped with a thermostatic valve expansion device.

To ensure the unit is properly charged for the intended application, check the unit refrigerant superheat at the compressor. The refrigerant superheat is a function of outdoor ambient temperature and return air temperature of the

1			10
2	5	8	11
2			11
3	6	9	12
3			12
6		9
		FS	K1

K2	R10
	R8

	D1
	L1
L2	L1
	UNUSED
L2
L2
	HEAT
L2
	COOL

	R31
	C27	D7
		D5
D3		R25
R38	C13
	R22
D9	R29
D10	Z1

R34

R3

R35

C20
K3
D14	R4
K4	R11
D12	R42
	D11
R36
	LED

conditioned space. It is the installing contractors responsibility to ensure the proper refrigerant superheat at the compressor is adjusted for each application. For example, 10 degree refrigerant superheat level is adequate for a 95 degree outdoor ambient temperature and a 78 - 80 degree for indoor return air temperature. As the outdoor ambient temperature rises the superheat decreases and as the outdoor ambient temperature lowers the superheat increases. Proper superheat adjustment optimizes cooling performance.

For models equipped with thermostatic expansion valve, charge system to 12-14 degrees of subcooling, adjust expansion valve stem for superheat setting when necessary.

1068-83-400A

Control Board (Top)

NOTE: If necessary, adjust fan OFF delay settings to obtain satis- factory comfort level.

WARNING

THIS UNIT M UST NOT BE USED AS A "CONSTRUCTION HEATER" DURING THE FINISHING PHASES OF CONSTRUCTIO N ON A NEW STRUCTURE. THIS TYPE OF USE M AY RESULT IN PREMATURE FAILURE OF THE UNIT DUE TO EXTREMELY LOW RETURN AIR TERMPERATURES AND EXPOSURE TO CORROSIVE OR VERY DIRTY ATM OSPHERES.

Unit Shutdown

1.Set the thermostat to lowest setting.

2.Turn off the electrical power supply to the unit.

3.Remove the heat exchanger door on the side of the unit by removing screws.

4.Move the gas control valve switch to the OFF position. Do not force.

5.Close manual gas shutoff valve external to the unit.

6.Replace the heat exchanger door on the unit.

7.If cooling and/or air circulation will be desired, turn ON the electrical power.

NOTE: The expansion valve will not need adjustment for most applications. Ensure system superheat is set between 10-12 degrees after final adjustment.

Cooling Operation

NOTE: Mechanical cooling cannot be reliably provided at ambient temperatures below 50° F.

1.Turn on the electrical power supply to the unit.

2.Place the room thermostat selector switch in the COOL position (or AUTO if available, and if automatic changeover from cooling to heating is desired).

3.Set the room thermostat to the desired temperature.

T R O U B L E S H O O T I N G

IGNITION CONTROL ERROR CODES

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 of diagnostic LED flashes. Refer to Diagnostic Indicator Chart for an interpretation of the signal and to this section for an explanation.

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