Refrigerant charge checking
•A few minutes after start up, working on cooling operating mode, check that condensing temperature, is approximately 15 °C higher than condenser inlet air temperature. Also check that the evaporation temperature is about 5 °C lower than the evaporator outlet temperature.
•When the unit has stabilised, check that the sight glass core shows green: if the core is yellow, moisture is present in the circuit. In this case it is necessary to dehydrate the circuit (qualified personnel only). Check at the sight glass that there are no continuous vapour bubbles present. If so, additional refrigerant charge may be required. (A few vapour bubbles are acceptable).
•Check that refrigerant superheat on the evaporator is about
•Check if refrigerant
Unit switch OFF
Please refer to the microprocessor manual enclosed with the unit.
Caution: For temporary stops (night time, weekend etc.) never switch off the unit by opening the mains
switch: this should only be used to disconnect the unit from the power supply when current is not passing through it, i.e. when the unit is in ‘OFF’ mode. Additionally, with no supply to the crankcase heater, the compressor could be seriously damaged at unit start up.
CONTROL AND SAFETY DEVICE SETTINGS
Control devices - factory settings
CAPACITY STEPS |
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| 2 |
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| 4 |
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CONTROL DEVICE |
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| Differential | Set point |
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| Differential | ||||
Control thermostat (cooling) |
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| °C |
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| 10 |
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| 2 |
| 9 |
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| 3 | ||
Control thermostat (heating) |
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| °C |
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| 42 |
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| 2 |
| 43 |
| 3 | |||
Safety devices - factory settings |
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CONTROL DEVICE |
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| SET POINT |
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| DIFFERENTIAL |
| RESET TYPE | ||||||
°C |
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| 4 |
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| 6 |
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| Manual | |||||
Electric heater thermostat | °C |
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| 4 |
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| 6 |
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| Manual | ||||
High pressure switch | bar |
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| 28 |
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| 7 |
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| Manual | ||||
Low pressure switch | bar |
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| 0,7 |
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| 1 |
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| Manual | ||||
End defrosting pressure | bar |
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| 18 |
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| Automatic | ||||||
Defrosting | bar |
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| 16 |
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| 2 |
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| Automatic | |||||
Water safety valve (Optional) | bar |
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| 6 |
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29 |
