COMPONENT IDENTIFICATION
Liquid line valve
This valve operates 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. The liquid line valve opens, and liquid
refrigerant flows to the thermostatic expansion
valve.
Thermostatic Expansion Valve
The metering device of the system, the valve
senses the temperature of the suction line and
varies 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. 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 its
inlet (evaporator) side regardless of the pressure
on the outlet (suction) side. The EPR is factory
set, adjust only if needed. After adjusting, re-check
TXV superheat.
EPR Settings:
RLE1202/952: 25 PSIG + or - 2 PSIG
RLE1200/950: 36 PSIG + or - 2 PSIG
RLE1500/1250: 25 PSIG + or - 2 PSIG
Evaporator:
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
Single System RL
November 1999
Page 7
