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Haier AD88NAHAAA Operation And Instruction Manual page 37

Duct type air conditioner
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INSTALLATION MANUAL FOR OUTDOOR UNIT
Step 1:Charge for more than 3 minutes under 0.3MPa(3.0kg/cm
Step 2:Charge for more than 3 minutes under 1.5MPa(15kg/cm
-----------Serious leakage may be found.
Step 3:Charge for more than 24 hours under 3.0MPa(3.0kg/cm
----------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/cm 2 g) pressure change for every 1 C ambient temperature change
during the 24-hour pressure charge.It should be corrected during the test.
Check for leakage
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.
Vacuum Pumping
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.
Indoor
Tightly
closed
Tightly
closed
Indoor unit
To the gauge
distributor
(Liquid side)access hole
(Liquid side)three-way valve
Outdoor
Solder joint
Solder joint
Tightly
Solder joint
closed
Detailed diagram of the
three-way valve
(Gas side )access hole
(Gas side)three-way valve
Field tube
Field tube
installation
installation
g)
2
g)
2
g)
2
Low-pressure
gauge
Three-way valve fully
closed(gas side)
Access hole
Access hole
Outdoor unit
Three-way valve fully closed
liquid side
To the unit
36
High-pressure
gauge
Gauge distributor
6.4 Copper pipe
P
Vacuum pump

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Au88nataaaHdu-88h03/hHdu-88h03