Hoshizaki FM-300AFE-HC, Руководство по обслуживанию

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[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 circuit
to prevent troubles with valves clogged with dirt or moisture.
[i] THERMOSTATIC EXPANSION VALVE
The Expansion Valve throttles high-pressure liquid refrigerant into low-temperature
low-pressure state by adiabatic expansion and maintains the proper amount of refrigerant
supply depending on the Evaporator load. The Thermostatic Expansion Valve controls the
valve position to regulate the superheat (difference between evaporating temperature and
suction gas temperature). No superheat control is available from outside.
To check the Expansion Valve for proper operation, remove the Bulb while the Compressor
is running. If the suction pressure rises, the Expansion Valve is working normally.
Note: Do not leave the Bulb removed for a long time while the Compressor is running.
The Compressor may fail due to liquid return.