Tetra Pak Hoyer Frigus 600, Manual

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7-41
Tetra Pak
Hoyer
B F60 03 G 04
- low coolant level.
• Insufficient condensation may be caused by:
- insufficient water coming from water
supply:check that all taps (on the line that
conveys water to the freezer) are open and
water is flowing to the freezer properly.
- optional pressure valve setting needs
adjustment: adjust using the knob on its top.
- if the optional water valve is set correctly,
the temperature of the water (flowing out of
the outlet with the system in operation)
should have a temperature of 28/35
°
C.
• If the thermostat valve is faulty, it will stay
closed, stopping the flow of coolant.
• If the line filter is blocked up, it will get
covered with frost which will block the flow
of coolant. Dismantle and replace it. It must
always be replaced whenever the cooling
circuit is opened.
• If the solenoid valve which controls the flow
of hot gas stays open, it will compromise the
performance of the refrigerating plant
considerably. Check the solenoid valve and
replace if necessary.
• The liquid solenoid valve automatically
closes the liquid line every time the
refrigerator compressor stops.
If the valve does not open, the refrigerating
plant will tend to idle, and the vacuum
pressure gauge will drop below -35 ° C. If this
occurs, check that the power is on to the
solenoid valve coil. If so, replace the coil.
• If the electrical system is working properly
and you have checked all the above, poor per-
formance may be due to low coolant level in
the refrigerating plant. This will result in
formation of gas bubbles which may be
detected by the indicator. When the coolant
level is low in the refrigerating plant, identify
the cause of the leakage before adding more
coolant.
CAUTION:
Do not add coolant to the refrigerator circuit
unless absolutely necessary.
The refrigerating plant will not work properly
with too much gas in it.
Periodically check the efficiency of the
pneumatic system and check whether the filters
are obstructed.
- Check that pneumatic connections are tight.
- Check that mix does not flow back from the
pump.
- Check the efficiency of the valves.
- If air flow is insufficient, replace filter
cartridges; if not, refer to the table of work
listed in the section on preventive
maintenance.
7.1.4 Maintenance of the pneumatic system
CAUTION:
Do not open filters, especially the sterilised
filter, unless there are problems with the
pump’s air supply.