[H] Water Regulator; [I] Drier; [J] Thermostatic Expansion Valve - Hoshizaki FM-251AFE Service Manual

[h] WATER REGULATOR - WATER-COOLED MODEL ONLY
The Water Regulator controls the water flow in the Water-cooled Condenser to maintain a
certain level of the discharge pressure. The discharge pressure may rise at startup but
stabilize in 30 minutes.
The Water Regulator is factory-adjusted. No adjustment is required under normal use
except for replacement of the FM-251AWFE(-N) or FM-481AWGE(-N) Water Regulator.
Adjust the Water Regulator, if necessary, using the following procedures:
1) Attach a pressure gauge to the high-side line of the system. Or prepare a thermometer
to check the condenser center temperature.
2) After 5 minutes of ice production, the pressure gauge should read 18 bar or the
thermometer read 38 - 40°C. If the readings are lower, use a flat blade screwdriver to
adjust the screw in a counterclockwise direction. If the readings are higher, adjust in a
clockwise direction. Adjust the screw by a half turn only each time and recheck the
readings before making further adjustments.
3) Check that the pressure or the condenser center temperature remains steady at the
recommended settings before removing the gauge or thermometer.

[i] DRIER

The Drier uses desiccants (molecular sieves + 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.

[j] 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
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