Inverter Hybrid Boiler
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● Perform leakage test on joints and connections using a leakage detector or soapy water.
Leakage
detector
Evacuating
Evacuating procedures
Leakage test
①
3-way valve (gas)
②
Needle valve
③
Valve cap
④
Valve needle
⑤
Allen (hex. head)
Wrench
⑥
2-way valve (liquid)
⑦
Flare nut
⑧
Liquid pipe
(small diameter)
⑨
Gas pipe
(large diameter)
⑩
Indoor unit
⑪
Outdoor unit
⑫
Vacuum pump
● Use a vacuum pump to perform evacuating during piping work.
● Do not use the compressor of the product as a vacuum pump.
● Do not use the refrigerant gas of the product to remove the air inside the
connection pipe.
● Additional refrigerant for air purging is not provided.
Caution
①
Remove the cap from the 3-way valve.
②
Generate a vacuum using the vacuum pump connected to the shut-off valve (gas)
on the suction side.
Maintain the shutdown state until the vacuum pressure reaches 50Pa (0.5mbar).
③
Open the liquid-side valve for 3 seconds and close it quickly.
Check whether any leakage is observed.
④
After checking for leakage, open the 3-way valve and the 2-way valve completely.
⑤
Fasten the cap and check the leakage status.
⑥
After completing the connection of all pipes, perform a leakage check using an
HFC refrigerant leakage detector.
⑦
After completing the connection of all pipes, apply soapy water to the pipes to
detect any leakages. Wrap the joint with insulator and finish with a tape.
①
②
④
⑤
⑥
③
①
Copper pipe
②
Copper pipe insulator
③
Fixing tape
④
Pipe
⑤
Pipe insulator
⑥
Fixing tape
Evacuating and leakage test
