Suggested Field Testing Troubleshooting - Amana A/GPDM3 Series Installation Instructions Manual

3. If the outdoor ambient is above 80°F, the unit may trip
on its high-pressure cutout when in heating mode. The
compressor should stop. The heating cycle must be
thoroughly checked, so postpone the test to another
day when conditions are more suitable but- DO NOT
FAIL TO TEST.
4. If the outdoor ambient is low and the unit operates
properly in the heating cycle, you may check the
pressure cutout operation by blocking off the indoor
return air until the unit trips. If unit operates properly
in the heating cycle, raise the temperature setting
until the heating second stage makes contact.
Supplemental resistance heat, if installed should now
come on. Make sure it operates properly.
NOTE: If outdoor thermostats are installed the outdoor
ambient must be below the set point of these thermostats
for the heaters to operate. It may be necessary to jumper
these thermostats to check heater operation if outdoor
ambient is mild.
5. For thermostats with emergency heat switch, The
emergency heat switch is located at the bottom of
the thermostat. Move the switch to emergency heat.
The heat pump will stop, the blower will continue to
run, the gas heating sequence will begin and the
thermostat emergency heat light will come on.
6. If checking the unit in the wintertime, when the outdoor
coil is cold enough to actuate the defrost control,
observe at least one defrost cycle to make sure the
unit defrosts completely.
SUGGESTED FIELD TESTING
TROUBLESHOOTING
Testing Defrost Control
NOTE: PCBDM133 defrost controls have a three (3) minute
compressor off cycle delay.
NOTE: The PCBDM133 defrost controls are shipped from
the factory with the compressor delay option selected. This
will de-energize the compressor contactor for 30 seconds
on defrost initiation and defrost termination. If the jumper
is set to Normal, the compressor will continue to run during
defrost initiation and defrost termination. The control will
also ignore the low-pressure switch connected to R-PS1
and PS2 for 5 minutes upon defrost initiation and 5 minutes
after defrost termination.
To check the defrost control for proper sequencing, proceed
as follows: With power ON; unit not running.
1. Jumper defrost thermostat by placing a jumper wire
across the terminals "DFT" and "R"/" R-DFT" at defrost
control board.
2. Remove jumper from timer pins and jump across test
pins on defrost control board.
NOTE: Do not use screwdriver or field supplied jumper to
test the control.
3. Set thermostat to call for heating. System should go
into defrost within 21 seconds.
4. Immediately remove jumper from test pins.
5. Using VOM check for voltage across terminals "C &
O". Meter should read 24 volts.
6. Using VOM check for voltage across fan terminals
DF1 and DF2 on the board. Should read line voltage
(208-230 VAC) indicating the relay is open in the
defrost mode.
7. Using VOM check for voltage across "W"/"W2" & "C"
terminals on the board. Should read 24 volts.
8. If not as above, replace control board.
9. Set thermostat to off position and disconnect power.
Remove jumper from defrost thermostat and replace
timer jumper to the desired defrost time.
NOTE: Remove jumper across defrost thermostat before
returning system to service.
PCBDM133 Defrost Control PCB
Testing Defrost Thermostat
1. Install a thermocouple type temperature test lead on
the tube adjacent to the defrost control. Insulate the
lead point of contact.
2. Check the temperature at which the control closes its
contacts by lowering the temperature of the control. It
should close at approximately 30°F.
3. Check the temperature at which the control opens its
contacts by raising the temperature of the control. It
should open at approximately 60°F.
4. If not as above, replace control.
Temperature Rise Check
Check the temperature rise through the unit by placing
thermometers in supply and return air registers as close
to the unit as possible. Thermometers must not be able to
sample temperature directly from the unit heat exchangers,
or false readings could be obtained.
1. All registers must be open; all duct dampers must be
in their final (fully or partially open) position and the
unit operated for 15 minutes before taking readings.
2. The temperature rise must be within the range
specified on the rating plate
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