Ugolini Mini GEL Manual De Servicio página 20

7 When the quantity of gas indicated on the Information Plate has been decanted, the refrigerator circuit is charged. Close the
"REF" valve and the valve on the charging unit, keeping the compressor running for a further few minutes.
8 Make sure that all the evaporator cylinders are covered with frost.
9 Close the "LOW" valve, disconnect the "LOW" pipe from the compressor charging pipe and screw the cap onto the bottom of the
charging pipe.
As an indication, the temperatures and corresponding evaporation and condensation pressures at which the machines must operate
are indicated below.
These temperatures and pressures must be verified under the following operating conditions:
Ambient temperature: 32 °C
Temperature produced in the tank: 0 °C
In these conditions, the evaporation temperature should be approximately -10 °C and the condensation temperature approximately
50°C.
These temperatures should correspond with the temperatures indicated in the table below, depending on the refrigerant gas used:
Refrigerant gas Evaporation Pressure
R134a 1,00 bar
10 COMPRESSOR FAULTS
To establish if a malfunction has occurred, proceed as follows:
1 Disconnect the machine's plug from the power supply.
2 Disconnect the conductors from the compressor terminals.
3 Using an ohmmeter, measure the isolation between the terminals and the compressor housing. If the instrument indicates
continuity, the compressor has short-circuited.
4 In this situation, the compressor must be replaced using the following method:
5 Collect the gas as described in the paragraph "Discharging the gas".
6 Remove the faulty compressor.
7 Eliminate the cause of the compressor fault (check the conditions of the condenser both when the machine is started up and
when it is operating, and also the condition of the starter relay as possible sources and causes of the fault).
8 Install a new compressor and a new dehydrator filter.
9 Empty and charge the circuit as described above.
Condensation Pressure
12,17 bar
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