21
Installation Procedure Outdoor Unit
In the first to third test steps, if the pressure drops, check the leakage in each joint use sense of hearing, feeling and
soap water, etc. methods to find the leaking point.
After confirming the leaking point, welding it again or tighten the nut tightly again.
Checking the leaking point
First step: 43.5PSI(3.0kg/cm
2
g) pressurize over 3 minutes.
Second step: 217.5PSI (15kg/cm
2
g) pressurize over 3 minutes.
Large leakage will be found.
Third step: 435PSI (30kg/cm
2
g) pressurize about 24 hours.
Little leakage will be found.
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).
Use vacuum pump to perform vacuumizing. It is strictly forbidden to use the refrigerant to remove the air inside the
system.
After air tightness test and discharging all the nitrogen,
connect the vacuum pump as
the following figure shown.
(4) Air discharging method
From pressurizing to 24 hours later, each 1 difference of
ambient temperature will make 1.45PSI (0.1kg/cm
2
g) pressure
change. It shall be corrected during test.
Check if the pressure drops
The pressure does not drop-passed
The pressure drops-check the leaking point.
Outdoor
Completely tightened
Completely tightened
Flare part
Outdoor units
Manhole
Discharging valve
3-way valve totally closed
(Gas side)
Low pressure peizometer
High pressure peizometer
Meter separator
Dropping valve
3-way valve totally closed
(Liquid side)
Nitrogen tank
VL VH
Indoor units
Indoor
Flare part
Large slip-on
connector
Cylinder of nitrogen
Cylinder pressure gauge
Line pressure gauge
Tubing bring brazed
Service house
Sweat joint
(5) Piping and indoor unit vacuumizing
3-way valve totally closed
(Liquid side)
Indoor units
Indoor Outdoor
Completely tightened
Completely tightened
Outdoor units
Vacuum pump
Discharging valve
3-way valve totally closed
(Gas side)
Low pressure peizometer
High pressure peizometer
Meter separator
VL VH
Flare part
Flare part
P
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