LG THERMA V Split Comprehensive Application And Installation Manual page 30

1.1 Piping installation
Are pipings correctly connected?
Items to check
(Water piping, refrigerant piping)
Purpose Check piping connection
Applicants AWHP SPLIT
Check in/outflow of water piping connections
Check connections of refrigerant piping and gas/liquid piping
[Supporter]
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_COMPREHENSIVE APPLICATION AND INSTALLATION MANUAL
Result
In-Water (PT)
1)
Out-Water
(PT 1)
Liquid-Refrigerant
(9.52 mm)
Gas - Refrigerant(15.88 mm)
[Tightening]
1.2 Leakage test
Was the standard airtight test run to check if there is any leakage from
Items to check pipings and the product?
(For R410A: 24-hour test with nitrogen pressure of 38 kg)
Purpose Check for leakage on pipings
Applicants AWHP SPLIT
Connect the manifold valve(with pressure gauges) and dry nitrogen gas cylinder to this service port with
charge hoses.
A Nitrogen gas
B Manifold gauge
C Low pressure cover
D High pressure cover
E Liquid pipe
F Gas pipe
G Service port
Be sure to use a manifold valve for leakage test.
If it is not available, use a stop valve for this purpose.
The "Hi" knob of the manifold valve must always be kept close.
• Pressurize the system to no more than 3.0 Mpa with dry nitrogen gas and close the cylinder valve when
the gauge reading reaches 3.0 Mpa Next, test for leaks with liquid soap.
After the system is found to be free of leaks, relieve the nitrogen pressure by loosening the charge hose
connector at the nitrogen cylinder. When the system pressure is reduced to normal, disconnect the
hose fromthe cylinder.
Result
Indoor unit
Outdoor unit
Manifold valve
Pressure
gauge
Lo Hi
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
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