Harvest Cycle - Scotsman NW507 Service Manual

Go straight to the harvest cycle.
9. First freezing time will range between 15 and
20 minutes. Longer time for temperature above
25 ℃
and shorter time required when
temperature are below25℃.Average complete
cycle time is about 22 min.

HARVEST CYCLE

1. During the harvest cycle the components in
operation are:
• Hot Gas valve
• Water Drain/Purge Valve
• Water Pump (According DIP Switch #6&#7)
• Compressor
And both
• Machine under Power
• Machine in Operation
2. After beginning of Harvest Cycle, Purge
Valve will according DIP Switch (#6&#7) setup
to purge water, 20" after the Purge Valve open,
the Water Inlet Solenoid Valve is energized for
10 seconds only in order to have a short flush
of fresh water into the sump while the Water
Pump and Purge valve are still in operation.
3. The Fan Motor remains in OFF mode unless
the Condenser Sensor probe rise up to more
then 38℃ (same set up as per end of freezing
cycle).
4. When the ice plate is falling down from the
evaporator, the magnetic switch is activated for
a while providing the signal to the PC Board to
restart a new freezing cycle.
5. Observe first ice cube harvest and check size
of ice cubes; if an adjustment is required thread
down or out screw NO.1 as shown on below
illustration.
This screw position determines the distance
between the sensor reeds and the egg-crate
evaporator thus keeping the ice cube at a
proper thickness.
NOTE: This type of machine produce an "ICE
PLATE" that breaks when falls down into the
storage bin. Setting the ice thickness sensor in
order to have single ice cubes may cause
malfunction of the machine.
6. Observe second and third cube harvest.
Check if size and shape combination is correct.
In areas where extreme problem water
conditions exist, filtering or purifying equipment
is recommended.
NOTE: If water used is too soft, "demineralized"
the ice thickness sensor might not be able to
sense the water on its reeds, thereby it will not
switch the unit on harvest
A safety system built in the P.C. Board switches
the unit on harvest cycle whenever the freezing
period gets longer than 30' or
NOTE: To assure a correct operation of the
machine the water must have a minimum
electric conductivity of 20μs.
7. Check operation of
controlling it by keeping open the bottom end of
plastic deflector for more than 30 seconds. The
machine must switch off at storage bin full.
Release the plastic deflector. The machine
should restart in the freezing cycle mode within
few seconds going through a 3' delay time.
8. Place again all cabinet panels and screws
previously removed.
9. Thoroughly explain to owner/user the
significant specifications of the ice maker
startup, reset and operation, going through the
procedures in the operating instructions.
Answer all questions about the ice maker by the
owner and inform the owner himself of the
name and telephone number of the authorized
service agency serving him.
19
cycle.
40'.
magnetic switch