Page 21
Page 21
At the end of the defrost cycle, both the hot gas
and the water inlet valves close and the machine
starts again a new freezing cycle.
OPERATION - CONTROL SEQUENCE
At the start of freezing cycle, the evaporator
temperature sensor controls the length of the
first part of the freezing cycle. As it reaches a
predetermined temperature, it supplies a low
voltage current to the P.C. BOARD in order to
activate the electronic timer which, takes over
the control of the freezing cycle for a pre-fixed
time, according to the DIP SWITCH keys setting
(see Tab. B).
NOTE. The evaporator temperature sensor,
factory pre-set, is the same for all the models
and is not adjustable.
Once completed the freezing cycle 2nd phase
the system goes automatically into the defrost
cycle which also has a pre-fixed length that can
slightly change in relation to the ambient tempe-
rature as shown in Table C.
At completion of the defrost cycle the P.C. BOARD
commands the unit to start again a new freezing
cycle.
OPERATION - ELECTRICAL SEQUENCE
The following charts illustrate which switches
and which components are ON or OFF during a
partÌcular phase of the icemaking cycle.
BEGINNIING FREEZE
Electrical components (Loads) . ON OFF
Compressor.................................. •
Fan Motor (Air cooled only) and TRIAC
•
Hot Gas Valve .............................. •
Inlet Water Valve .......................... •
P.C. Board Relay 1 Coil ............... •
P.C. Board Relay 2 & 3 Coil......... •
Water Pump ................................. •
Contactor Coil .............................. •
Electronic Timer ........................... •
Electronic Controls & Sensors .. ON OFF
Evaporator Sensor ....................... •
Condenser Sensor ....................... •
Ambient Sensor............................ •
Ice Level Control .......................... •
TIMED FREEZE
Electrical components (Loads) . ON OFF
Compressor.................................. •
Fan Motor (Air cooled only) and TRIAC
••
Hot Gas Valve .............................. •
Inlet Water Valve .......................... •
P.C. Board Relay 1 Coil ............... •
P.C. Board Relay 2 & 3 Coil ......... •
Water Pump ................................. •
Contactor Coil .............................. •
Electronic Timer ........................... •
Electronic Controls & Sensors . ON OFF
Evaporator Sensor ....................... •
Condenser Sensor ....................... • •
Ambient Sensor............................ •
Ice Level Control .......................... •
HARVEST
Electrical components (Loads) . ON OFF
Compressor.................................. •
Fan Motor (Air cooled only) and TRIAC .
•
Hot Gas Valve .............................. •
Inlet Water Valve .......................... •
P.C. Board Relay 1 & 2 Coil ......... •
P.C. Board Relay 3 Coil ............... •
Water pump.................................. •
Contactor Coil .............................. •
Electronic Timer ........................... •
Electronic Controls & Sensors . ON OFF
Evaporator Sensor ....................... •
Condenser Sensor ....................... •
Ambient Sensor............................ •
Ice Level Control ..........................
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