Scotsman NM1850RH Manual page 13

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
SUCTION LINE
LIQUID
SIGHT GLASS
HAND VALVE
LIQUID LINE
VALVE
THERMO VALVE
EVAPORATORS
BALL VALVES
May, 1989
Page 13
NM1850RH
evaporator, where it
boils off (evaporates)
LINE
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.
EPR VALVE