Installation Manual
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EN
NOTE
Do not connect two or more indoor units to one PMV Kit. Arrange one indoor unit and one PMV Kit set to 1 by 1.
NO GOOD
OK
PMV Kit
PMV Kit
Indoor unit
Indoor unit
Airtight test
Before starting an airtight test, further tighten the spindle valves on the gas side and liquid side.
Pressurize the pipe with nitrogen gas charged from the service port to the design pressure to conduct the airtight test.
After the airtight test is completed, evacuate the nitrogen gas.
• Apply pressure from the service ports of the packed valves (or ball valves) at liquid side and gas side.
• An air tight test can be only performed to the service ports at liquid side and gas side of the outdoor unit.
• Close fully valves at liquid side and gas side. As there is possibility that nitrogen gas enters in the refrigerant cycle,
re-tighten the valve rods before applying pressure.
(Re-tightening of the valve rods are unnecessary for valves at gas side because they are ball valves.)
• For each refrigerant line, apply pressure gradually with steps at liquid side and gas side.
Apply pressure to gas side and liquid side.
REQUIREMENT
Do not use “Oxygen”, “Flammable gas” and “Noxious gas” in an airtight test.
To detect a gross leakage
1. Apply pressure 0.3 MPa (3.0 kg / cm
2
G) for 3 minutes or more.
2. Apply pressure 1.5 MPa (15 kg / cm
2
G) for 3 minutes or more.
To detect a slow leakage
3. Apply pressure 3.73 MPa (38 kg / cm
2
G) for approx. 24 hours.
• Check pressure down.
No pressure down: Accepted
Pressure down: Check the leaked position.
Main pipe
Connected to indoor unit
Low pressure
guage
High pressure
guage
Ball valve fully closed
(Gas side)
Flare connection
Flare connection
Packed valve fully closed
(Liquid side)
Service port
Ø6.4 Copper pipe
Ø6.4 Copper pipe
Nitrogen gas
Reducing
valve
Gauge
manifold
Outdoor unit
Service
port
EN-35
EN-36
