OPERATION - ELECTRICAL SEQUENCE
The following charts illustrate which switches
and which components are ON or OFF during a
particular phase of the icemaking cycle.
BEGINNING FREEZE (Time T1 and T2)
Electrical components (Loads) ....
ON
OFF
Compressor .....................................
•
Water Pump ....................................
•
Fan Motor (Air cooled only) .............
•
Hot Gas Valve .................................
•
Water Inlet Valve .............................
•
Water drain valve ............................
•
P.C.Board Relay 1 Coil ...................
•
P.C.Board Relay 2 & 3 Coil .............
•
Electronic Timer ..............................
•
Electronic Controls & Sensors ....
ON
OFF
Evaporator Sensor ..........................
•
Ice Level Sensor .............................
•
TIMED FREEZE (Time Ta)
Electrical components (Loads) ....
ON
OFF
Compressor .....................................
•
Water Pump ....................................
•
Fan Motor (Air cooled only) .............
•
Hot Gas Valve .................................
•
Water Inlet Valve .............................
•
Water drain valve ............................
•
P.C.Board Relay 1 Coil ...................
•
P.C.Board Relay 2 & 3 Coil .............
•
Electronic Timer ..............................
•
Electronic Controls & Sensors ....
ON
OFF
Evaporator Sensor ..........................
•
Ice Level Sensor .............................
•
HARVEST
Water Drain Phase
Electrical components (Loads) ....
ON
OFF
Compressor .....................................
•
Water Pump ....................................
•
Fan Motor (Air cooled only) .............
•
Hot Gas Valve .................................
•
Water Inlet Valve .............................
•
Water drain valve ............................
•
P.C.Board Relay 1 & 3 Coil .............
•
P.C.Board Relay 2 Coil ...................
•
Electronic Timer ..............................
•
Electronic Controls & Sensors ....
ON
OFF
Evaporator Sensor ..........................
•
Ice Level Sensor .............................
•
HARVEST
Water Filling Phase
Electrical components (Loads) ....
ON
OFF
Compressor .....................................
•
Water Pump ....................................
•
Fan Motor (Air cooled only) .............
•
Hot Gas Valve .................................
•
Water Inlet Valve .............................
•
Water drain valve ............................
•
P.C.Board Relay 1 & 3 Coil .............
•
P.C.Board Relay 2 Coil ...................
•
Electronic Timer ..............................
•
Electronic Controls & Sensors ....
ON
OFF
Evaporator Sensor ..........................
•
Ice Level Sensor .............................
•
OPERATING CHARACTERISTICS
On air cooled models, during the freezing cycle,
the discharge pressure will slowly decline as the
unit freezes ice and at the same time the suction
pressure will also decline, reaching its lowest
point just before harvest. Compressor amps
experience a similar drop.
On water cooled models, the discharge pressure
is maintened during the freeze cycle between 8
and 10 bar (110
÷
140 psig) by the combination of
a pressure control and a water inlet solenoid
valve. However, suction pressure and compressor
amps will still decline as the machine freezes ice.
Freeze Cycle
Average Discharge Pressure
A/C:
8
÷
10 bar (110
÷
140 psig)
Average Discharge Pressure
W/C:
9 bar (125 psig)
Suction Pressure
End Freeze Cycle:
0
÷
0.1 bar (0
÷
2 psig)
REFRIGERANT METERING DEVICE:
capillary tube
REFRIGERANT CHARGE (R 134a)
Air Cooled
Water Cooled
320 gr (11.5 oz)
280 gr (10 oz)
Page 13
Содержание DX 40
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