INVENTOR DR2VI32-09WFI Benutzer- & Installationshandbuch Seite 25

Installation Procedure
After finishing connection of refrigerant pipe, it shall perform air tightness test.
●The air tightness test adopts nitrogen tank to give pressure according to the pipe connection mode as the following figure shown.
●The gas and liquid valve are all in close state. In order to prevent the nitrogen entering the circulation system of outdoor unit, tighten
the valve rod before giving pressure (both gas and liquid valve rods).
Indoor
Completely tightened
Completely tightened
Indoor units
1) Pressurize for over 3 minutes at 0.3MPa (3.0 kg/cm
2) Pressurize for over 3 minutes at 1.5MPa (15 kg/cm
large leakage will be found.
3) Pressurize for about 24 hours at 3.0MPa (30 kg/cm
small leakage will be found.
●Check if the pressure drops
If the pressure does not drop, then pass
If the pressure drops, then please check the leaking point.
When pressurizing for 24 hours, a variation of 1'C in the ambient temperature will cause a variation of 0.01MPa(0.1kg/cm2g) in
pressure. It shall be corrected during test.
●Checking the leaking point
In 1) to 3) steps, if the pressure drops, check the leakage in each joint by listening, touching and using soap water etc.to identify the
leaking point. After confirming the leaking point, welding it again or tighten the nut tightly again.
stop valve totally closed
(Gas side)
Outdoor
Flare part
Discharging valve
Flare part
Manholel
Outdoor units
stop valve totally closed
(Liquid side)
2
g).
2
g). A
2
g). A
Sweat joint
Large slip-on connector
Low pressure piezometer
High pressure piezometer
Meter separator
Dropping valve
Nitrogen tank
Line pressure gauge
Tubing bring brazed
Service hose
Air Tightness Test
Cylinder pressure gauge
Cylinder of nitrogem
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