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

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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.
2. EVAPORATOR ASSEMBLY
WARNING
This machine contains flammable refrigerant. Do not attempt to disassemble and
service the evaporator assembly unless qualified, competent and authorised to do
so.
If any component of the evaporator assembly requires removal or replacement, please
contact the manufacturer:
HOSHIZAKI EUROPE LIMITED
Telford 70 Stafford Park 7, Telford, Shropshire TF3 3BQ UK
Tel: +44 (0)1952-291777
Fax: +44 (0)1952-292777
[a] APPLICABLE PARTS
See Fig. 16.