Hoshizaki FM-170EE-50-HC, Service Manual

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[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.
[e] EVAPORATOR CASING
The Evaporator Casing is a thin and rigid stainless steel pipe tightly coiled around with a
copper tube and solder finished. The refrigerant flows through a very narrow path in the
Expansion Valve with a sudden drop of pressure and evaporates by absorbing heat of
vaporization from the Evaporator Casing. The water supplied inside the Evaporator
Casing is deprived of heat and forms ice film which will be scraped and moved up by
the Auger.
[f] CONDENSER
The Condenser refrigerates and liquefies the high-temperature high-pressure refrigerant
gas discharged from the Compressor into high-pressure liquid refrigerant. The
Condenser is air-cooled.
A dirty Condenser will significantly reduce the refrigeration efficiency and performance,
and will also shorten the service life of the components (especially refrigeration circuit).
The frequency of cleaning depends on the installation conditions.
a) Air-cooled Condenser (Spiral tube type)
A copper tube is attached on a spiral aluminum plate with high heat conductivity to
promote heat radiation, and a Fan Motor is also provided for forced air cooling.
Use a vacuum cleaner or brush to remove dirt and dust between the spiral fins. Be
careful not to bend the fins.
[g] CONDENSER COOLING FAN MOTOR
The Fan Motor cools the Air-cooled Condenser and sends air to condense refrigerant
gas inside the Condenser.
[h] DRIER
The Drier uses desiccants (molecular activated alumina) to absorb moisture in
the refrigeration circuit. The built-in filter also corrects foreign matter in the refrigeration