Inverter Compressor. GE Consumer & Industrial ZIC360NR, ZICS360NR

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Inverter Compressor. GE Consumer & Industrial ZIC360NR, ZICS360NR | Manualzz

Inverter Compressor

The new inverter compressor is not controlled by 120 VAC output from the main control board, as in previous models. The compressor is controlled by the inverter.

Warning: Disconnecting the 6-pin connector does not disconnect power

(120 VAC) from the inverter. The refrigerator must be unplugged before servicing the inverter or 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 230 VAC within a range of 57 to 104 Hz. Compressor speed is controlled by voltage frequency and pulse width modulation. Increasing frequency from the inverter will produce an increase in compressor speed.

• Frequency of 57 Hz will produce low speed operation at 1710 rpm.

• Frequency of 70 Hz will produce medium speed at 2100 rpm.

• Frequency of 104 Hz will produce 3120 rpm.

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

BTU rating also varies according to operating speed.

Compressor speed is based on the temperature set-point in conjunction with the cabinet temperature.

Speeds are selected according to the following cabinet temperatures:

• 8°F to 19.5°F above set-point = high speed

• 6°F to 8°F above set-point = medium speed

• 3.5°F to 6°F above set-point = low speed

Note: The compressor will run at medium speed if the cabinet temperature is 20°F or more above the set-point.

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

Ω to 11Ω should be read between any 2 of the 3 pins.

Should an open 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.

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High compressor torque enables the compressor to start against high pressure in the sealed system.

When power has been disconnected from an operating unit, the high torque may enable the compressor to start immediately upon power restoration. The compressor, if unable to start after 12 times, will wait for 8 minutes before trying again.

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.

To determine motor rpm:

Measure the frequency of the voltage being applied to the compressor and multiply this number by 30.

For example, a frequency measurement of 70 Hz would show a compressor speed of 2100 rpm (30 x

70 = 2100).

Note: If the compressor fails to start, the inverter will briefly stop voltage output. The inverter will make

12 consecutive attempts to start the compressor (once every 12 seconds). If, after 12 attempts, the compressor has not started, an 8-minute count will occur. After 8 minutes, the inverter will attempt to start the compressor again. If the compressor starts, normal operation will resume. If the compressor fails to start, the process will be repeated. Removing power from the unit will reset the inverter count.

When power is restored, the inverter will attempt to start the compressor within 8 seconds.

Note:

• When ordering a replacement compressor, order both the compressor and inverter. Replace the compressor first. 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

120 VAC wiring separate.

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