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EVACUATING
Air Purge
This air conditioner can be installed up to the connecting pipe length and height difference in the following table.
Max. connecting
pipe length (m)
50
Height difference (m)
Outdoor unit at upper side Outdoor unit at lower side
30 15
Hexagonal wrench size
4 mm
With respect to the preservation of terrestrial environment, adopt “Vacuum pump” for air purge (Evacuate air in
the connecting pipes) when installing the unit.
• Do not discharge the refrigerant gas to the atmosphere to preserve the terrestrial environment.
• Use a vacuum pump to discharge the air (nitrogen, etc.) remained in the set. If the air remains, the capacity
may decrease.
For the vacuum pump, be sure to use one with backflow preventer so that the oil in the pump does not backflow
into the pipe of the air conditioner when the pump stops. (If oil in the vacuum pump is put in an air conditioner
including R410A, it may cause trouble on the refrigeration cycle.)
Vacuum pump
As shown in the right figure, connect the charge hose after the manifold valve are closed completely.
Tighten valve and caps of the charge port surely.
Disconnect the charge hose from the charge port.
Open fully the valve stem or the valve handle. (First, at liquid side, then gas side)
Leave the vacuum pump as it is for 1 or 2 minutes, and check the indicator of the compound pressure gauge does not return.
Turn OFF the vacuum pump.
Close handle Low completely.
Execute vacuuming until the compound pressure gauge indicates –101kPa (–76cmHg). (*1)
Tighten the flare nut again.
Loosen the flare nut of the packed valve (Gas side) a little to check the air passes through. (*2)
Turn ON the vacuum pump (*1)
Open handle Low fully.
Attach the connecting port of the charge hose with a projection to push the valve core (setting pin) to the charge port of the set.