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Inverter Compressor
Caution: Do not attempt to direct-start the
compressor. The compressor operates on a 3-phase
power supply. Applying 120 VAC to the compressor
will permanently damage the unit. It is not possible
to start the compressor without an inverter.
The compressor is a reciprocating, variable speed,
4-pole type. It operates on 3-phase, 80 to 240 VAC
within a range of 55 to 130 Hz.
Note: Certain voltmeters will not be able to read
voltage output or frequency from the inverter.
Compressor wattages at various speeds are 60-180
watts.
The compressor is controlled by the inverter, which
receives its signal from the main control board.
Varying the frequency to the inverter changes the
compressor speed.
Compressor speed is based on the temperature
set point in conjunction with the specifi c cabinet
temperature.
The use of 3-phase power eliminates the need for
the relay, capacitor, and individual start and run
windings; therefore, the start, run, and common
pins found on conventional compressors are not
applicable on this 3-phase model. Compressor pin
functions are identical and compressor lead wire
confi guration is of no importance. A resistance of
9 to 11 should be read between any 2 of the
3 pins. Should an opening occur in the compressor
winding or should one of the compressor lead wires
become open or disconnected, the inverter will stop
voltage output to the compressor.
Compressor operation is extremely smooth and
cool. The compressor exterior temperature may
be slightly higher than room temperature while
operating; therefore, it may be diffi cult to detect a
running unit.
BROWN
BLACK
BLUEWHITE
BROWNRED
ORANGE
GROUND
INVERTER
COMPRESSOR
GREEN/YELLOW
GREEN/YELLOW
GROUND
TO CABINET
WIRING
COMMUNICATION
SIGNAL
BROWN
To verify that the compressor is running:
Run diagnostic 0-95 and check for compressor
startup. Feel for a vibration when the compressor
tries to start. It may take up to 8 seconds before the
compressor attempts to start.
Note:
• The inverter has built-in circuit protection to
guard against damage from a failed or shorted
compressor. However, if a failed compressor
is diagnosed, order a new compressor
and inverter. Replace the inverter fi rst. If
the compressor fails to start after inverter
replacement, replace the compressor.
• When servicing the compressor, it is important
to dress the wiring to keep low voltage DC wiring
and 120 VAC wiring separate.
Single-Speed Compressor
The compressor is a reciprocating type. Refer to the
mini-manual for specifi cations.
To verify that the compressor is running:
WARNING: During normal operation, the
temperature of the single-speed compressor may
be hot. Use caution to avoid injury and wear Kevlar
®
gloves or equivalent protection.
Disconnect power from the unit. Wait 3 to 5 minutes
for pressure to equalize. Place a hand on the
chassis, near the compressor. Reconnect power and
feel for a vibration when the compressor tries to
start.
Note: The single-speed compressor will start right
away if pressure is equal.
RUN CAPACITOR
TO CABINET
WIRING
ORANGE
WHITE
ORANGE
BLACK
OVERLOAD
RELAY
GREEN
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