Scotsman MC 45 Wartungshandbuch PDF herunterladen (Seite 14)

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Rx Tx

WATER IN VALVE

HOT GAS VALVE

CONTACTOR COIL

FAN MOTOR

WATER PUMP

- EVAPORATOR

- AMBIENT

- CONDENSER

TEMPERATURE SENSORSBINCOMPRESSOR

TRANSF.

DATA

PROCESSOR

ELECTR.

TIMER

DIP

SWITCH

ELECTRONIC CARD

L

N

RELAYS

RELAY

TRIAC

WATER DRAIN VALVE

FIG.2

freezing cycle with the start up of:

COMPRESSOR

WATER PUMP

FAN MOTOR/S (in air cooled version) controlled

by the condensing temperature sensor located

within the condenser fins (Fig.2).

OPERATIONAL CHECKS

F. If necessary install the refrigerant service

gauges on both the high side and low side

Schräder valves to check the compressor head

and suction pressures.

NOTE.

On air cooled models the condenser

temperature sensor, which is located within

the condenser fins, keep the head

(condensing) pressure between 16 and 18

bars (225-250 psig).

In the water cooled models the discharge

pressure is kept constant at the value of 17

bars (240 psig) by means of a water regulating

valve located on the water supply line to the

condenser.

In case of condenser clogging such to prevent

the proper flow of the cooling air on, in case

the fan motor is out of operation or shortage

of water in the water cooled condenser, the

condenser temperature rises and when it

reaches 70

°

C (160

°

F) - for air cooled version

- and 62

°

C (145

°

F) - for water cooled version

- the condenser temperature sensor shuts-

off the ice maker with the consequent light-

up of the RED WARNING LIGHT (Fig. 3).

After having diagnosed the reason of the rise

of temperature and removed its cause, it is

necessary to turn the head of the selector

always using an appropriate scewdriver -

first on the RE-SET position then return it on

previous OPERATION position, thus to put

the machine in condition to initiate a new

freezing cycle.

The machine restarts with the usual 5 minutes

water filling phase in order to provide enough

water into the sump tank.

G. Check to see through the ice discharge

opening that the self propeller spray bar is correctly

rotating and that the water jets uniformely reach

the interior of the inverted mold cups and there is

not excessive water spilling through it.

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