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5 ton High Efficiency A5 Duct Technical Manual
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Use PVC piping as a conduit for all underground installations. Buried lines should be kept as short
as possible to minimize the buildup of liquid refrigerant in the suction line during long periods of
shutdown.
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Pack a sealing material such as perma gum around refrigerant lines where they penetrate a wall
to reduce vibration and to retain some flexibility.
Vacuum
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It will be necessary to evacuate the system to 350 microns or less.
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If a leak is suspected, leak test with dry nitrogen to locate the leak.
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Repair the leak and test again.
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To verify that the system has no leaks, simply close the valve to the vacuum pump suction to
isolate the pump and hold the system under vacuum. Watch the micron gauge for a few minutes.
If the micron gauge indicates a steady and continuous rise, it is an indication of a leak. If the
gauge shows a rise, then levels off after a few minutes and remains fairly constant, its an
indication that the system is leak free but still contains moisture and may require further
evacuation if the reading is above 350 microns.
After vacuum, according to the diameter and length of the connective pipe of liquid side between the
indoor unit and outdoor unit, calculate the refrigerant replenishment quantity. The refrigerant for
replenishment is R410A.
Diameter of liquid-side pipe
Quantity of refrigerant replenished for 1m pipe length
Φ9.52mm
0.0555kg
Notes:
Please check and record the replenished quantity of the air conditioner.
5.
Heat Insulation of Refrigerant Pipe
In order to prevent faults caused by condensate of the refrigerant pipe and drain pipe, perform