Hoshizaki FM-300AFE-HC, Service Manual

Page: 32 / 69

28
5. REFRIGERATION CIRCUIT
WARNING
This machine contains flammable refrigerant. Do not attempt to break into the
refrigerant circuit unless qualified, competent and authorised to do so.
[a] APPLICABLE PARTS
Refrigerant (R290)
Compressor
Evaporator Casing
Air-cooled Condenser
Air-cooled Condenser Fan Motor
Drier
Thermal Expansion Valve (with MOP)
[b] SERVICE INSTRUCTIONS
Always restore the original bindings after servicing the refrigeration circuit. Otherwise,
vibration may cause overstress and damage to the circuit, resulting in refrigerant leak.
After replacing the Evaporator or Auger, run the icemaker for 30 minutes to produce ice,
check for impurities, and discard.
[c] REFRIGERANT
The HFC-free refrigerant is flammable and sealed in the refrigeration system. Although the
refrigerant does not leak out under normal usage, take utmost care when handling this
icemaker so as not to cause any damages to the system. In the case of accidental damage
to the refrigeration system causing refrigerant leak, do not create a source of ignition in the
area. Do not operate electrical switches or plugs in the area, do not use naked flame.
Immediately ventilate the area by opening doors and/or windows.
[d] COMPRESSOR
The Compressor absorbs the low-pressure refrigerant gas vaporized in the Evaporator (to
reduce the pressure inside the Evaporator), compresses the refrigerant into
high-temperature high-pressure gas, and sends it out to the Condenser.
The hermetic-type Compressor is efficient in refrigeration, and the refrigeration circuit is
designed to endure long hours of operation. The Compressor is mounted on vibration
damping rubber to prevent transmission of vibration. In case of accidental overload, the
Case Thermostat or Overload Relay will shut down the Compressor. The Reset Button
must be pressed to reset the Overload Relay.