Scotsman NW308 Service Manual page 29

sump to the tee. From there water is
channeled through the vertical PVC tube to
the water distributors, above the evaporator
plate, and from the holes in the distributor tube
water flows to the cells on one side of the
evaporator plate.
Gravity flow returns the unfrozen excess
portion of water to the sump reservoir for
recirculation.
11. Water Purge Solenoid Valve
The Water Outlet Solenoid Valve functions in
conjunction with the water pump to flush-out
the sump assembly as DIP switch #6&#7
setup. This action cleans-up and rinses the
sump during each harvest cycle preventing
dangerous water minerals concentration.
12. Thermostatic Expansion Valve
The Thermostatic Expansion Valve regulates
the flow of refrigerant to the evaporator and
reduces pressure of liquid refrigerant from
condensing pressure to evaporating pressure.
13. Water pump
The water pump primes the water from the
sump to the water distributor tube and through
the distributing holes it cascades down onto
the evaporator cells by gravity so to be frozen
into clear ice cubes. The water pump remains
off during the first 40" seconds of the freezing
cycle (to avoid any cavitations problem).while
it's kept running during as DIP switch #6&#7
setup.
14. Water inlet solenoid valve - 3/4" male
fitting
The Water Inlet Solenoid valve is energized by
the P.C. Board during the beginning of the
freezing cycle till the water reaches the
maximum level into the sump (controlled by
the Water Level Sensor).
After 3 minutes, from the start up of the
freezing cycle, the Water Inlet Valve is
energized again for a short period to re-fill the
sump with water till again to the maximum
level so to minimize any possibility of slush ice
formation
A flow control, fitted into its outlet port, reduces
the pressure of the water flow.
15. Water level sensor
The Water Level Sensor, located on the upper
right side of the water sump, works in
conjunction with the P.C. Board in order to
control the water level at beginning of the
freezing cycle by receiving a low power current
passing through the water. When the current
reaches the PC Board, the water inlet solenoid
valve is de-energized.
In case the PC Board doesn't receive any
signal(current) as DIP switch #4 setup from
the Water Level Sensor, the PC Board trips
OFF the operation of the machine with the
switching ON of the Water Error LEDs.
16. Start up delay PC Board by-pass switch
Located in the back side of the machine allows
to by-pass the delay time controlled by the
delay PC Board.
WARNING: It is IMPERATIVE to by-
pass the delay time only when
sure of proper warm up of
compressor.
17. LED display
28
Located in the upper and right
side of the machine when
remove the front panel.
1 -- Power light (Green)
2 -- Freezing light (Green)
3 -- Bin full light (Yellow)
4 -- Alarm light (Red)
5 -- High pressure alarm light
(Red)
6 -- Clean light (Red)
7 -- Harvest light (Yellow)
B1 -- Mode button
B2 -- CLEAN button