Icematic N 132M, Service Manual, Page: 24 / 30

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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 30" seconds of the
freezing cycle (to avoid any cavitation problem) while
it's kept running during the first 10" of defrost/harvest
cycle to drain out (purge) the remaining water from the
sump (reach in mineral salts).
14. Water inlet solenoid valve - 3/4" male fitting
The Water Inlet Solenoid valve is energised by the P.C.
Board during the beginning of the freezing cycle till the
water reaches the maximum level into the sump (con-
trolled by the Water Level Sensor).
After 3 minutes, from the start up of the freezing cycle,
the Water Inlet Valve is energised again for a short
period to re-fill the sump with water till again to the
max. level so to minimise 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 front 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 pass-
ing through the water.
When the current reaches the PC Board, the water
inlet solenoid valve is de-energised.
In case the PC Board doesn’t receive any signal (cur-
rent) from the Water Level Sensor within the first 3
minutes of the freezing cycle, 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
Located in the back side of the unit it delays the start
up of the entire machine by 90' so to avoid that com-
pressor can start up w/out be pre-heated.
17. 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.
18. Harvest Assist Solenoid
Operated by the controller in parallel with the hot gas
valve. Cycles on and off at the beginning of a restart.
Energized throughout the harvest cycle.
Line voltage coil.
WARNING. It is IMPERATIVE to by-pass the
delay time only when sure of proper warm up
of compressor.