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2.6.2 Protection Devices Required
For air-conditioning or heat pump unit, the following protective devices should be installed:
1) Reverse Phase Protector
Scroll compressor will only compress in one rotational direction. This is very important for three phase
compressors since three-phase induction motor will run in either rotational direction equally depending on
phasing of the power. Reverse rotation will result in excessive noise, and no suction / discharge pressure
differential appears as well as no cooling effect in the suction line.
For three phase systems, mechanic device or reverse rotation module in the system control unit is necessary
in preventing three phases compressor from running in the reverse rotational direction.
2) Discharge Gas Thermostat
The discharge temperature will rise rapidly if the compressor is running under the overload conditions or lack
of refrigerant conditions.
The maximum discharge temperature should be maintained by a discharge thermostat .
For the C-SB series, it is located on the discharge line within 100mm(4”) of the compressor shell and must
not exceed 130℃(266F). The discharge thermostat should be installed on top side of the discharge tube, it
should not be attached underneath the tube. It is important that the discharge thermostat should also be well
insulated as below picture.
The C-SC series has a sensor well on the top shell and that temperature must not exceed 135℃(275F).
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