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8.3 REPAIRS TO REFRIGERANT CIRCUIT
8.3 REPAIRS TO REFRIGERANT CIRCUIT
8.3 REPAIRS TO REFRIGERANT CIRCUIT
8.3 REPAIRS TO REFRIGERANT CIRCUIT
8.3 REPAIRS TO REFRIGERANT CIRCUIT
After working on the refrigerant circuit, make the following checks:
- check for leaks;
- discharge and dry the circuit;
- charge with refrigerant.
When discharging the circuit recover the refrigerant with appropriate
When discharging the circuit recover the refrigerant with appropriate
When discharging the circuit recover the refrigerant with appropriate
When discharging the circuit recover the refrigerant with appropriate
When discharging the circuit recover the refrigerant with appropriate
equipment.
equipment.
equipment.
equipment.
equipment.
8.3.1 LEAKAGE CHECK
8.3.1 LEAKAGE CHECK
8.3.1 LEAKAGE CHECK
8.3.1 LEAKAGE CHECK
8.3.1 LEAKAGE CHECK
Charge the system with anhydrous nitrogen from a gas cylinder with pressure reducer valve and bring the pressure
up to 15 bar. Check for leaks using a bubble leak detector. The presence of bubbles or foam indicates a leak.
If any leaks are detected, discharge the circuit and weld with the appropriate alloy.
DO NOT use oxygen instead of nitrogen – danger of explosion.
DO NOT use oxygen instead of nitrogen – danger of explosion.
DO NOT use oxygen instead of nitrogen – danger of explosion.
DO NOT use oxygen instead of nitrogen – danger of explosion.
DO NOT use oxygen instead of nitrogen – danger of explosion.
8.3.2 VACUUM AND DRYING REFRIGERANT CIRCUIT
8.3.2 VACUUM AND DRYING REFRIGERANT CIRCUIT
8.3.2 VACUUM AND DRYING REFRIGERANT CIRCUIT
8.3.2 VACUUM AND DRYING REFRIGERANT CIRCUIT
8.3.2 VACUUM AND DRYING REFRIGERANT CIRCUIT
In order to obtain a high vacuum in the refrigerant circuit, use a high vacuum pump (0.1 mbar) with a capacity of
10m
3
/h. A single cycle at 0.1 mbar is usually sufficient with this type of pump.
If such a pump is not available, or if the circuit has been left open for a lengthy period, three vacuum cycles should
be run. This is also the recommended procedure when humidity is present in the circuit.
Connect the vacuum pump to the charge fittings.
Proceed as follows:
- Create a 35 mbar vacuum in the circuit and charge with nitrogen to 1 bar.
- Repeat.
- Repeat again, this time create the highest vacuum available with the pump in use.
This procedure will extract up to 99% of the impurities in the circuit.
Summary of Contents for KAPPA V 2001
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