Blue Box KAPPA V 2001, Руководство по эксплуатации, установке и техническому обслуживанию

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5.4 CHECKS DURING OPERATION 5.4 CHECKS DURING OPERATION 5.4 CHECKS DURING OPERATION 5.4 CHECKS DURING OPERATION 5.4 CHECKS DURING OPERATION
- Check that the evaporator input water temperature corresponds to the service thermostat setting;
- On units equipped with pumps, if pump operation is noisy gradually close the delivery valve until normal
operation resumes. This can occur when the system pressure drop is very different from the pump head.
5.5 REFRIGERANT CHARGE CHECK 5.5 REFRIGERANT CHARGE CHECK 5.5 REFRIGERANT CHARGE CHECK 5.5 REFRIGERANT CHARGE CHECK 5.5 REFRIGERANT CHARGE CHECK
- After a few hours of operation, check that the sight glass shows a green colour; a yellow colour indicates
humidity in the circuit. In this case the circuit must be dehumidified by qualified personnel.
- Check the sight glass for bubbles in the circuit. A continuous flow of bubbles may indicate a need to recharge
the circuit. The presence of a small number of bubbles is however no cause for alarm.
- A few minutes after the compressor starts, when operating in summer (cooling) mode, check that the condensation
temperature on the pressure gauge is about 15°C higher than the condenser input air temperature. Also check
that the evaporation temperature on the pressure gauge is about 5°C lower than the evaporator output water
temperature.
- Check that refrigerant overheating is in the range 5 - 7°C as follows:
1) measure the compressor suction line temperature with a contact thermometer;
2) take a suction side pressure gauge temperature reading (saturation temperature corresponding to suction
pressure); for units with R407c refrigerant use the pressure gauge scale marked D.P. (Dew Point).
The difference between the two readings is the overheating value.
- Check that refrigerant sub-cooling is in the range 5 - 7°C as follows:
1) measure the condenser delivery line temperature with a contact thermometer;
2) take a condenser delivery side pressure gauge temperature reading (saturation temperature corresponding to
the condenser delivery side pressure); for units with R407c refrigerant use the pressure gauge scale marked B.P.
(Bubble Point).
The difference between the two readings is the sub-cooling value.