Operation; Suggested Field Testing / Trouble Shooting - Goodman GSX Series Installation & Operation Instructions

13. Supplementary resistance heat, if installed, should now
come on. Make sure it is operating correctly. If outdoor
thermostats are installed, the outdoor ambient must be
below the set point of these thermostats for heaters to
operate. It may be necessary to jumper these thermo-
stats to check heater operation if outdoor ambient is mild.
14. For thermostats with emergency heat switch, return to
startup (item #9). The emergency heat switch is located
at the bottom of the thermostat. Move this switch to emer-
gency heat. The heat pump will stop, the indoor blower
will continue to run, all heaters will come on and the ther-
mostat emergency heat light will come on.
15. If checking the unit on the heating cycle in the winter-
time, when the outdoor coil is cold enough to actuate the
defrost control, observe at least one defrost cycle to make
sure the unit defrosts properly.
16. Check to see if all supply and return air grilles are ad-
justed and air distribution system is balanced for the best
compromise between heating and cooling.
17. Check for air leaks in the ductwork.
18. Make sure the heat pump is free of "rattles", and the tub-
ing in the unit is free from excessive vibration. Also make
sure lines are not rubbing against each other or sheet
metal surfaces or edges. If so, correct the trouble.
19. Set thermostat at the appropriate setting for cooling and
heating or automatic changeover for normal use.
20. Be sure the owner is instructed on the unit operation,
filter servicing, correct thermostat operation, etc.
The foregoing "Start-up Procedure and Check List" is recom-
mended to serve as an indication that the heat pump system
will operate normally.
COMPONENTS:
1. Contactor - This control is activated (closed) by the room
t-stat for both heating and cooling. It is de-energized (open)
during emergency heat. The contactor has a 24 volt coil
and supplies power to the compressor and outdoor fan
motor.
2. Crankcase Heater - This item is on whenever power is
supplied to the outdoor unit. It warms the compressor
crankcase, thereby preventing liquid migration and sub-
sequent compressor damage. It is connected electrically
to the contactor L1 and L2 terminals.
3. Condenser motor - The condenser motor is activated by
the contactor during heating and cooling except during
defrost and emergency heat operation.
4. Compressor - This item is activated by the contactor for
heating and cooling except during emergency heat. It is
protected by an internal overload.
5. Defrost Control - The defrost control provides time/ tem-
perature initiation and termination of the defrost cycle.
6. Loss Of Charge Protector - The control opens from its
normally closed position to open the compressor contactor
should the system lose its refrigerant charge.
7. Outdoor Thermostats - These optional controls are used
to prevent full electric heater operation at varying outdoor
ambient (-17.8 to 7.2°C). They are normally open above
their set points and closed below to permit staging of in-
door supplemental heater operation.
8. Reversing Valve Coil - This coil is activated by the ther-
mostat (system switch) during cooling only and during
defrost. It positions the reversing valve pilot valve for cool-
ing operation.

OPERATION:

In operation the power to the circuit board is controlled by a
temperature sensor which is clamped to a return bend on the
outdoor coil. Timing periods of 30, 60, or 90 minutes may be
selected by connecting the circuit board jumper wire to 30,
60, 90 respectively.
Accumulation of time for the timing period selected starts
when the sensor closes (approximately -2.2°C) and when the
wall thermostat is calling for heat. At the end of the timing period,
a defrost cycle will be initiated provided the sensor remains
closed.
When the sensor opens (approximately 18.3°C), the defrost
cycle is terminated. If the defrost cycle is not terminated due to
the sensor temperature, a 10 minute override interrupts the
defrost period.

SUGGESTED FIELD TESTING / TROUBLE SHOOTING

A. Run unit in heat mode.
B. Check unit for proper charge. Note: Bands of frost indi-
cate low refrigerant charge
C. Shut off power to unit.
D. Disconnect outdoor fan by removing the purple lead from
"DF2" on defrost control.
E. Restart unit and allow frost to accumulate.
F. After a few minutes of operation, the defrost thermostat
should close. To verify this, check for 24 volts between
"DFT" and "C" on board. If the temperature at the ther-
mostat is less than -2.2°C and the thermostat is open,
replace the thermostat as it is defective.
G. When the defrost thermostat has closed, short the "test"
pins on the board until the reversing valve shifts, indi-
cating defrost. This could take up to 21 seconds de-
pending on what timing period the board is set on. After
defrost initiation, the short must instantly be removed or
the defrost period will only last 2.3 seconds.
H. After the defrost has terminated, check the defrost ther-
mostat for 24 volts between "DFT" and "C". The reading
should indicate 0 volts (open sensor).
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