Goodman Mfg R-410A Defrost Cycle, Fan Operation, Airflow Adjustments For Indoor Blower Motor

SYSTEM OPERATION

APH15 M Series ECM equipped models only:

With the thermostat set to the emergency heat position and a call for 2nd stage heat, R to W1 will be energized. This will energize the electric heat sequencers and also energize W1 on the Variable Speed Terminal Board to start the indoor blower motor. When the normally open contacts of the heat sequencers close, this will energize the electric resistance heat.

GPH15 M Series X13 equipped models only:

With the thermostat set to the emergency heat position and a call for 2nd stage heat, R to W1 will be energized. This will energize the electric heat sequencers and the GE X13TM motor. The electric heat will be energized through the nor- mally open contacts of the electric heat sequencers. The indoor blower will be energized through W from the thermo- stat.

DEFROST CYCLE

Package Heat Pumps

The defrosting of the outdoor coil is jointly controlled by the defrost control board and the defrost thermostat.

Solid State Defrost Control

During operation the power to the circuit board is controlled by a temperature sensor, which is clamped to a feeder tube entering the outdoor coil. Defrost timing periods of 30, 60, or 90 minutes may be selected by connecting the circuit board jumper to 30, 60, or 90 respectively. Accumulation of time for the timing period selected starts when the sensor closes (approximately 34° F), and when the room thermostat calls for heat. At the end of the timing period, the unit’s defrost cycle will be initiated provided the sensor remains closed. When the sensor opens (approximately 60° F), the defrost cycle is terminated and the timing period is reset. If the de- frost cycle is not terminated due to the sensor temperature, a ten minute override interrupts the unit’s defrost period.

TEST				DF2
		JUMPER WIRE
	90	A
			DF1
	60
	30
		C Y	W2 R R DFT

FAN OPERATION

Continuous Fan Mode

APH15 M Series ECM equipped models only:

If the thermostat calls for continuous fan, the indoor blower will be energized through the VSTB at 30% of selected sec- ond stage cooling speed on APH15 units.

If the thermostat is not calling for heat or cool, and the fan switch on the thermostat is returned to the automatic posi- tion, the fan will stop after a 60 second delay on APH15 units.

*PH15[24-60]M41*

GPH15 M Series X13 equipped models only:

If the thermostat calls for continuous fan, the indoor blower will be energized from the G terminal of the thermostat to the X13 blower motor.

If a call for heat or cool occurs during a continuous fan call, the GE X13TM motor will always recognize the call for the highest speed and ignore the lower speed call.

If the thermostat is not calling for heat or cool, and the fan switch on the thermostat is returned to the automatic posi- tion, the fan will stop after the programmed 60 second off delay on units with the GE X13TM motor.

AIRFLOW ADJUSTMENTS FOR INDOOR BLOWER MOTOR

APH15 M Series ECM equipped models only:

Dip switch 4 must be set to ON for APH1524- 36. Dip switch 4 must be set to OFF for 2-stage compressor models APH1548-60. Dip switch 4 ON energizes Y1 signal to the ECM motor anytime Y/Y2 is energized. The indoor motor will not operate properly if switch is not set correctly for the model.

ECM Motor

The ECM control board is factory set with the dip switch #4 in the “ON” position for single stage units and to the "OFF" position for the 2 stage units. All other dip switches are fac- tory set in the “OFF” position. For most applications, the settings are to be changed according to the electric heat size.

The ECM motor provides many features not available on the traditional PSC motor. These features include:

•Improved Efficiency

•Constant CFM

•Soft Start and Stop

•Improved Humidity Control

Motor Speed Adjustment

Each ECM blower motor has been preprogrammed for opera- tion at 4 distinct airflow levels when operating in Cooling/ Heat Pump mode or Electric Heat mode. These 4 distinct levels may also be adjusted slightly lower or higher if de- sired. The adjustment between levels and the trim adjust- ments are made by changing the dip switch(s) either to an "OFF" or "ON" position.

Dip Switch Functions

The ECM motor has an electronic control that contains eight

(8) 2-position dip switches. The function of these dip switches is shown in Table 1.

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