5.Refrigerant Piping
Use refrigerant R410A in the refrigerant cycle(refer to outdoor nameplate). Do not
charge oxygen, acetylene or other flammable and poisonous gases into the refrigerant cycle
when performing a leakage test or an air-tight test. These types of gases are extremely
dangerous and can cause an explosion. It is recommended that compressed air, nitrogen or
refrigerant be used for these types of tests.
5.1 The Piping Materials
(1) Prepare locally-supplied copper pipes.
(2) Select the piping size from the following table.
(3) Select clean copper pipes. Make sure there is no dust and moisture inside. Blow the inside
of the pipes with nitrogen or dry air, to remove any dust or foreign materials before connecting
pipes.
5.2 The Piping Connection
(1) Position of piping connection is shown in Fig.5.1.(Indoor Unit)
(2) When tightening the flare nut, use two spanners as shown in Fig.5.2.
Installation and Maintenance
20
6.35 20
Liquid pipe connector
Gas pipe connector
Hole for cords and cables
Drain pipe connector
Check water pump here
5
5
12K,18K
24K,36K,42K,48K,60K
φ12.7
6
(mm)
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