Scotsman FME24RLM - Manual (Page 8)

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. 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 (evaporators) 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:
· R-22 models (2402/1852): 25 PSIG
· R-404A models (2404/1854, 3004/2504): 36
PSIG
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.
Double System RL
November 2000
Page 8
LIQUID LINE
VALVE
THERMO VALVE
EPR VALVE THERMO
VALVE
EVAPORATOR