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Residential Air Conditioners and Heat Pumps Using R-22 and Puron® Refrigerant: Application Guideline and Service Manual
Troubleshooting (HK32EA003/008)
If outdoor unit will not run:
1. Does the Y input have 24 volts from thermostat? If not, check
thermostat or wire. If yes proceed to #2
2. The Y spade terminal should have 24 volts if Y input is energized.
This output goes through the pressure switches and back to the T1
input to energize the time delay and defrost timing circuit. If the
contactor is not closed, the time delay may still be active. Defeat
time delay by shorting speed up pins for 1 second. Be sure not to
short more than 1 second.
3. Once time delay has elapsed voltage on T2 should energize
contactor with 24v. Check voltage on contactor coil. If no voltage
is present, check for opened pressure switch.
4. If voltage is present and contactor is open, contactor may be
defective. Replace contactor
5. If contactor is closed and unit will still not run, check capacitor and
compressor.
If unit will not go into defrost:
1. Perform speedup function as described above to test the defrost
function of the circuit board.
2. If the unit will go into defrost with the speed up, but will not on its
own, the defrost thermostat may not be functioning properly.
Perform the full defrost thermostat and board troubleshooting the
same as described for the HK32EA001/007 control. Other than the
Quiet shift (if selected), and the speedup timing,
troubleshooting process is identical.
3. If unit still will not run defrost, remove thermostat pigtail harness
from board and perform checks directly on input pins with jumper
wires. The pigtail may have a bad connection or be mis-wired.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
HK32EA008 DEFROST CONTROL
The HK32EA008 defrost control is used in most non-communicating
Preferred Series heat pumps with Puron refrigerant and has all the same
functionality, speedups, troubleshooting as the HK32EA003 except for
the forced defrost timing when Quiet Shift-2 is enabled.
Quiet Shift-2 (non-communicating)
Quiet shift-2 is a field selectable defrost mode (factory set to OFF),
which will reduce the occasional noise that could be heard at the start of
defrost cycle and restarting of heating cycle. It is selected by placing DIP
switch 3 on defrost board in the ON position.
When Quiet Shift-2 switch is placed in ON position, and defrost is
initiated, the following sequence of operation will occur: The
compressor will be de-energized for approximately 1 minute, then the
reversing valve will be energized. A few seconds later, the compressor
will be re-energized and the normal defrost cycle starts. Once defrost
termination conditions have been met, the following sequence will
occur: The compressor will be de-energized for approximately 1 minute,
then the reversing valve will be de-energized. A few seconds later, the
compressor will be re-energized and the normal heating cycle starts.
HK32EA010 DEFROST CONTROL
The HK32EA010 is used in place of the HK32EA003/008 boards when
an outdoor ECM motor is being used. The functionality of these controls
are identical except the HK32EA010 uses 24v to turn the outdoor motor
on/off at the ODF terminal. The 24v signal is internal to the board and
usually originates from the indoor transformer. The other side (common)
the
of the ECM motor is connected directly to the 24v common side of the
contactor.
HK32EA011 DEFROST CONTROL
The HK32EA011 is used in place of the HK32EA003/008 boards on all
Legacy Series heat pump models with aluminum tube condenser coils.
The functionality and troubleshooting of these controls are identical
except for the following:
DIP switch settings for defrost interval apply only the initial defrost
interval. After the initial period the defrost period varies with defrost
cycle length.
Forcing a defrost will reset the defrost interval to the DIP switch setting
before resuming variable length intervals based on defrost cycle length.
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Troubleshooting
