OPERATION: Refrigeration
The remote high side
supplies high pressure
liquid R502 to the liquid
line connection on the
ice machine. After the
sight glass, there are
two separate liquid lines,
each leading to a liquid
line valve. When the
individual ice level
sensor causes the circuit
board to energize the
liquid line valve, the
valve opens, allowing
the liquid refrigerant to
enter that expansion
valve. The thermostatic
expansion valve meters
the liquid refrigerant into
the evaporator, where it
boils off (evaporates)
and absorbs heat. It
then moves through the
ball valve and into the
evaporator pressure
regulator valve, or EPR.
The EPR keeps the
evaporator pressure
above a predetermined
point, even though the
suction line pressure of
the remote high side
system may vary. The
refrigerant, now a low
pressure gas, moves
into the suction line of
the remote high side
system.
LIQUID
LINE
SIGHT GLASS
HAND VALVE
LIQUID LINE
VALVE
THERMO VALVE
EVAPORATORS
BALL VALVES
EPR VALVE
SUCTION LINE
FM2400RH
August 1994
Page 13
