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Reversing Valve
The reversing valve operates on 230/208 VAC or 265
VAC and is used to switch the direction of refrigerant
fl ow. The reversing valve controls the direction of the
refrigerant fl ow. When the reversing valve solenoid
is energized, it will move the reversing valve and
the unit will operate as an air conditioner. When
the solenoid is de-energized, the reversing valve
will move in the opposite direction and the unit will
function as a heat pump.
To confi rm that the reversing valve and reversing
valve solenoid are functioning properly, the
main board continually monitors the indoor coil
thermistor and outdoor coil thermistor. Should
the system operate in the reverse of the selected
mode due to a reversing valve or reversing valve
solenoid malfunction, the board will detect improper
thermistor readings, determine that the unit is not
operating properly, and terminate compressor
operation.
Note:
Some thermostats can be programmed
to energize the reversing valve in heat mode or
cool mode. If the thermostat is not programmed
correctly, the unit will heat when the thermostat
is set to cool and will cool when the thermostat
is set to heat. Refer to the instructions provided
with the thermostat for thermostat programming
procedures. The reversing valves in these units
default to heat.
Disconnect the reversing valve wire harness on
the power board at location CN105. Check for a
resistance of less than 1
Ω
on the disconnected
wires.
Compressor and Capacitor
The Zoneline compressor is a rotary type that
operates on 230/208 VAC or 265 VAC. After the
board has cycled the compressor off, it will
not attempt to restart for 3
minutes
±
seconds,
regardless of the state of the thermostat. This will
allow internal pressure to equalize and prevent the
compressor from stalling by trying to start against
high pressure in the sealed system.
Current fl ow into the compressor is monitored by
the main board to determine if the compressor is
running or locked. If the run signal is sent and a
locked condition is detected for 4 seconds, the run
signal will stop and a 3-minute count will begin.
After the 3-minute count, the run signal is sent
again. If the compressor starts, the count is reset
and the unit functions normally. If the compressor
does not start after 4 consecutive attempts, the
control will determine that a compressor failure has
occurred. If the unit is in heating mode, it will supply
resistance heat to maintain the temperature in the
room.
The compressor run capacitor is located under the
main board housing inside the control box. To test,
substitute a known good capacitor.
Filter/Drier
A fi lter/drier should be installed whenever servicing
the cooling system. For heat pump models, install a
dryer in the horizontal section of the discharge tube
between the compressor and reversing valve.
The fi lter dryer for electric resistance heat models
should be installed in the liquid tube between the
condenser and the capillaries.
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