9.6.
Running-in Check
It is essential to service the machine after about 10 working days, or earlier if any incident has
occurred.
CHECK:
Water level
Minimum high pressure (fan should stop at 35-37ºC, equivalent to 5.25 bar, 67.5 psi)
By-pass opening at -21ºC ± 0,5ºC during the first few minutes after start-up
Ice dispersion cone is spreading ice uniformly inside the bin.
Refrigerant charge (when fan switches off, bubbles should appear at the sight glass, and
return line to the compressor should be covered in frost right up to the weld). If high-pressure
manometer is connected do not disconnect until you stop the machine and pressures have
stabilised. Check that a large amount of gas has not been lost in connecting/disconnecting
manometers, and use the shortest hoses you can find in H.P.
Any gearbox oil leaks?
NOTE:
Newly installed electromechanical control devices will suffer variations in their adjustment
caused by the machine’s own functioning. Once a second adjustment of these devices is
carried out, this should be good for several years. It is recommended, however, to check these
devices yearly, this is best done between October to April.
SAFETY TRIP (CIRCUIT-BREAKER) IN NEW MACHINES WILL SWITCH OFF THE
MACHINE DUE TO ONE OF THE FOLLOWING:
Ambient temperature is below 5ºC
Water temperature is below 5ºC
Evaporation temperature is below -20ºC
Cooling temperature below +30ºC
Refrigerant charge slightly low
In the first three cases, so long as temperatures do not drop below 3ºC (machine limit), re-adjust
fan pressostat to 42ºC and check that by-pass opens at -21ºC. In the last two cases bypass will
open and close very often. Adjust bypass, fan pressostat and add refrigerant if necessary.
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