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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 240 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 230 VAC within a range of 57 to 104 Hz.
Note: Certain voltmeters will not be able to read
voltage output or frequency from the inverter.
Compressor wattages at various speeds are:
• LOW - 65 watts
• MED - 100 watts
• HIGH - 150 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.
BROWN
J15-1 J15-2
BLACK
Main
Control
10
Board
10
COMPRESSOR
Compressor speed is based on the
temperature set point in conjunction with the
specific cabinet temperature. Speeds are
selected according to the following cabinet
temperatures, with freezer temperature being
the primary:
• 4°C to 11°C above freezer set point
= high speed.
• 2°C to 4°C above freezer set point
= medium speed.
• 0°C to 2°C above freezer set point
= low speed.
• 0°C to 2.5°F above refrigerator set
point = low speed.
AC
ORANGE
ORANGE
BLACK
WHITE
BLUE
RED
10
BROWN
INVERTER
• 0°C to 1°C above refrigerator set point
- medium speed.
• 1°C to 1°C above refrigerator set point
- high speed.
Note: The compressor will run at medium speed
if the freezer temperature is 10°C or more above
the setpoint.
The use of 3-phase power eliminates the need
for the PTCR 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 configuration is of no
importance. A resistance of 9 ohms to 11 ohms
should be read between any 2 of the 3 pins.
Should an open occur in the compressor wind-
ing or should one of the compressor lead wires
become open or disconnected, the inverter will
stop voltage output to the compressor.
High compressor torque enables the compres-
sor to start against high pressure in the sealed
system. When power has been disconnected
from an operating unit, the high torque will
enable the compressor to start immediately
upon power restoration.
Compressor and sealed system operation is
extremely smooth and cool. The compressor
exterior may be room temperature while
operating; therefore, a running unit may be
difficult to detect.
To verify that the compressor is running:
Disconnect power from the unit and place a
hand on the compressor. Reconnect power and
feel for a vibration when the compressor tries to
start. It may take up to 8 seconds before the
compressor attempts to start.
Note:
When ordering a replacement compressor,
order both the compressor and inverter.
Replace the compressor fi rst. If, after
compressor installation, the compressor fails
to start, replace the inverter.
When servicing the compressor, it is important
to dress the wiring to keep low voltage DC
wiring and 240 VAC wiring separate.
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