Installation Guide

22
Installation Procedure
Air Tightness Test
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).
Low pressure piezometer
\ High pre~sure piezometer
stop valve totally closed
I
d
I
O
td
(Gas side) ovL VHQ
n oor - - u oor .--- _ _ ______
7
-.,..,............,...., Meter separator
J, --,
,-- - - - -, Completely tightened
I
'
I Flare part
1
I '
' I
I
!
1
,
Completely tightened : 1'
1
Dischar ing valie
'
I I Flare part 1
L ____ _
f Manhole /:.' !Dropping valve
/ • ~:: I
, -- :~.: I
Nitrogen tank
Indoor units
L Oufcfoor units '
stop valve totally closed
(Liquid side)
1) Pressurize for over 3 minutes at 0.3MPa (3.0 kg/cm
2
g).
2) Pressurize for over 3 minutes at 1.5MPa (15 kg/cm
2
g). A large
leakage will be found.
3) Pressurize for about 24 hours at 3.0MPa (30 kg/cm
2
g}. A 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.
Line pressure gauge
··-......_ .
Tubing bring brazed
-✓-
Sweatj6int
\
Large slip-on connector _
Service
hose --- --
When pressurizing for 24 hours, a variation of 1 • C in the ambient temperature will cause a variation of 0.01 MPa(0.1 kg/cm
2
g}
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.