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(3) Main parts
1) Digital scroll compressor
The variable capacity compressor shall control the unit capacity from 10% to 100%,
utilizing 19 separate capacity steps.
2) Accumulator
This shall prevent the return of liquid refrigerant to the compressor.
3) Liquid receiver
This shall reduce the unit noise level, and also shall allow control of the flow
of high pressure liquid refrigerant to the individual indoor units.
4) Solenoid valve (PWM)
This valve shall be installed at the top of the digital scroll compressor and shall be
used to provide capacity control of the compressor. When the valve is open
the compressor is in its unloaded state.
5) Solenoid valve (HGBV)
Should the suction pressure in the unit fall this valve shall open. The valve shall also
be used to equalize system pressures upon shut down and assist the compressor in starting.
6) Solenoid valve (LBV)
Should the compressor temperature rise this valve shall open to cool the compressor
and maintain reliable operation.
7) Solenoid valve (VBV)
This valve shall also assist in equalizing the system pressure upon shut down,
reducing the starting load on the compressor.
8) High pressure switch (HPS)
Shall be used to stop the system operation in the event of a high pressure situation occurring.
9) Low pressure switch (LPS)
Shall be used to prevent system operation should the system pressure fall below a preset limit (20 Psig)
10) Condenser outlet sensor (COS)
Shall measure the temperature of the liquid refrigerant leaving the condenser coil.
In the heat pump mode this shall be used for defrost control.
11) Outdoor air temperature sensor (OATS)
Shall be used to measure the outdoor air temperature.
12) Fixed capacity scroll compressor
Shall be used whenever the system load exceeds 50% in a two compressor unit.
4-2.Outdoor unit_TM_E_06890 2/27/03 10:15 AM Page 23
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