Hoshizaki TM-500AAE, Руководство по обслуживанию

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[i] CONDENSER COOLING FAN MOTOR
The Fan Motor cools the Air-cooled Condenser and sends air to condense refrigerant gas inside
the Condenser.
[j] 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.
[k] SOLENOID VALVE
The Solenoid Valve is provided for pump down control to prevent refrigerant gas from remaining
inside the Evaporator and causing liquid return at restart.
[l] 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.
[m] ACCESS VALVE
The Access Valve connects the inside and outside of the refrigeration circuit to allow evacuation,
recharge, and pressure measurement.
Note: When replacing (brazing) the Access Valve, remove the valve core to prevent the
rubber part from melting. The valve is sealed by the core only. Always cap the valve while
not in use. Tighten the seal nut to the torque of 9.81 - 12.26Nm to prevent gas leaks.
[n] RECEIVER TANK
The Receiver Tank temporarily stores excess liquid refrigerant which may be caused by a change
in ambient temperature. The Access Valve provided for servicing can also be used to check
the high-side pressure.