COMPONENT IDENTIFICATION
Liquid line valve(s)
These valves operate to turn the ice making
process on and off.
When the ice level drops in the ice chute, the
ice level sensor will cause the circuit board to
close the liquid line relay, which energizes the
liquid line valve for that side of the system.
The liquid line valve opens, and liquid
refrigerant flows to the thermostatic expansion
valve.
Thermostatic Expansion Valve
The metering device of each system, the
valve(s) sense the temperature of the suction
line and vary the amount of liquid refrigerant
that passes through the valve into the
evaporator, thus maintaining a constant level
of refrigeration. TXV’s are factory set. Do not
adjust unnecessarily.
DO NOT ADJUST THE TXV UNTIL THE EPR
HAS BEEN SET.
The superheat setting is 4-8
0
F. Measure the
temperature of the evaporator outlet at the
TXV bulb, and check the low side pressure at
the EPR valve (about 24 PSIG). Convert the
pressure to temperature (using a temperature
pressure chart) and subtract the amount from
the outlet temperature. The result is the
superheat. Use an electronic thermometer.
EPR: Evaporator Pressure Regulator Valve
This valve maintains a constant pressure on
it’s inlet (evaporators) side regardless of the
pressure on the outlet (suction) side. The EPR
is factory set, adjust only if needed. After
adjusting check TXV superheat.
Evaporators:
Where the water is frozen into ice crystals. As
the water cools, it begins to turn into ice, and
the slowly turning auger lifts the ice, as it is
being made, and forces it up and out of the
"breaker" or spout where the extra water is
compressed out of the ice. The ice then drops
through the chute, into the storage bin.
LIQUID LINE
VALVE
THERMO VALVE
EPR VALVE
THERMO
VALVE
EVAPORATOR
NM1852RH
August 1992
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