T
o
the unit
To the unit
(Gas side)three-way valve
(Gas side )access hole
Detailed diagram of the
three-way valve
To the gauge
distributor
(Liquid side)access hole
Three-way valve fully closed
liquid side
6.4 Copper pipe
Vacuum pump
Gauge distributor
High-pressure
gauge
Low-pressure
gauge
Three-way valve fully
closed(gas side)
Solder joint
Solder joint
Tightly
closed
Indoor unit
Indoor
Outdoor
Access hole
Solder joint
Tightly
closed
Tightly
closed
Access hole
Outdoor unit
(Liquid side)three-way valve
Field tube
installation
Field tube
installation
P
INSTALLATION MANUAL FOR OUTDOOR UNIT
26
Step 1
:Charge for more than 3 minutes under 0.3MPa(3.0kg/cm
2
g)
Step 2
:Charge for more than 3 minutes under 1.5MPa(15kg/cm
2
g)
-----------Serious leakage may be found.
Step 3
:Charge for more than 24 hours under 3.0MPa(3.0kg/cm
2
g)
----------Small leakage may be found.
Check for pressure decrease
Without pressure decrease-Pass
With pressure decrease-Check for leaage.
There will be a 0.01MPa(0.1kg/cm2g) pressure change for every 1 C ambient temperature change
during the 24-hour pressure charge.It should be corrected during the test.
In the case of pressure decrease during steps 1 to 3 ,check the joints with the ear,hand or soapsuds
for leakage.Repair it by welding or tighten the connecting nut up.
Use vacuum pump to evacuate the air.Never use the refrigerant for the evacuation.
Drain off the nitrogen gas after the leak test and then connect the vacuum pump as shown in the figure
below.
The vacuum pumping must be done from both the liquid and gas inlets.
Check for leakage
Vacuum Pumping
