5 EVACUATING
Air Purge
This air conditioner can be installed up to the connecting pipe length and height difference in the following table.
Capacity rank | Max. connecting | Height difference (m) | Hexagonal | ||
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| pipe length (m) | Outdoor unit at upper side | Outdoor unit at lower side | wrench size | |
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SM560 type | 30 | 30 | 15 | 4mm | |
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SM800, SP560, SP800 type | 50 | 30 | 15 | ||
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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.
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.
Open the handle Low fully.
Turn ON the vacuum pump (*1)
Loosen the flare nut of the packed valve (Gas side) a little to check the air passes through. (*2)
Tighten the flare nut again.
Execute vacuuming until the compound pressure gauge indicates
Close handle Low completely.
Turn OFF the vacuum pump.
Leave the vacuum pump as it is for 1 or 2 minutes, and check the indicator of the compound pressure gauge does not return.
Open fully the valve stem or the valve handle. (First, at liquid side, then gas side)
Disconnect the charge hose from the charge port.
Tighten valve and caps of the charge port surely.
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