Gree GRS-Cm53/NaA-M - Page 69

Chapter Ⅳ Maintenance（3. Maintenance of Key Parts）
67
4-way valve
It is a device used to change the direction of refrigerant flow
when the circulating type water heater is in defrosting status.
After entering the defrosting status, refrigerant is compressed
by the compressor. Meanwhile, the 4-way valve takes action
and the refrigerant direction will be changed. It will enter the
evaporator directly for heat exchange and defrosting. Then it
will flow into the tube in tube heat exchanger via the expansion
valve. After that, refrigerant is sucked back by the compressor
and repeats its flow again.
Water flow switch
It is used to control the water flow in the water system and
prevent frequent abnormality protection of the unit due to
large/poor flow.
3.2 Removal/Installation of Key Parts
3.2.1 Removal/Installation of GRS-Cm28/NaA-M、GRS-Cm28/NaA1-M main unit
3.2.1.1 Compressor
Removal/ Installation of the compressor
Remarks: Before removing the compressor, make sure there is no refrigerant in unit‟s pipeline
system and power supply is cut off.
Step
Figure
Operation Instructions
1 、 Remove
the front panel,
compressor power
cable and the
electric heating
band.
● First use a screwdriver to
remove the front panel;
● Use a screwdriver to loosen
the power cord fixing screw;
● Then take away
compressor‟s power cord and
remove the electric heating
band;
● Reclaim the refrigerant.