Installation Precedure
Outdoor Unit
6. Leak Test
Leak test must be made after connection of the refrigerant pipe according to the following diagram.
Close all the gas and liquid valves.To prevent nitrogen gas from invading the outdoor circulating system, close the valve tightly before pressure increase,(Both the gas and liquid valves must be tightly closed.)
Every cooling system must be charged slowly from the gas and liquid valves. It must be charged from the gas and liquid valves.
Note:
Never use oxygen, flamable and poisonous gases for the leak test.
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Indoor | Outdoor |
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| VL | VH |
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| Gauge distributor |
Tightly | Solder joint | Solder |
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closed |
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joint | Access hole |
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| Copper pipe |
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Tightly | Solder joint | Tightly |
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closed |
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closed | Access hole | ||||
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Indoor unit |
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Detailed diagram of the | |||||
To the gauge distributor |
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(Liquid side)access hole |
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(Liquid |
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| Field tube | Field tube |
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| installation | installation |
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6.4Relief valve
Copper pipe
Nitrogen bottle
(1)Pressurize for more than 3 minutes under 0.3MPa(3.0kg/cm2g)
(2)Pressurize for more than 3 minutes under 1.5MPa(15kg/cm2g). Serious leakage may be found.
(3)Pressurize for more than 24 hours under 3.0MPa(3.0kg/cm2g). Small leakage may be found.
Check if the pressure decrease
If the pressure does not decrease, then the test passes. If the pressure decrease, check for leakage.
There will be a 0.01MPa(0.1kg/cm2g) pressure change for every 1 C ambient temperature change during the
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.
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