Hitachi RCI-1.5UNE1NH - Refrigerant Piping; The Piping Material; The Piping Connection

20
1.5/2.0HP
3.0/4.0/5.0/6.0/6.5HP
Gas pipe (mm) Liquid pipe (mm)
1.5HP
ø9.52 ø6.35
2.0HP ø12.7 ø6.35
3.0HP
ø15.88 ø9.52
4.0/5.0/6.0/6.5 ø19.05 ø9.52
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 type of gases are extremely dangerous
and can cause an explosion. It is recommended that compressed air, nitrogen or refrigerant
be used for these type of tests.
5.1 The Piping Materials
(1) Prepare locally-supplied copper pipes.
Installation and Maintenance
Model
(3) Select clean copper pipes. Make sure there is no dust and moisture inside. Blow the pipes
with nitrogen or dry air to remove dust and foreign materials before connecting pipes.
5.2 The Piping Connection
(1) Position of piping connection is shown in Fig.5.1.(Indoor Unit)
Liquid pipe connector
Gas pipe connector
Hole for cords and cables
Drain pipe connector
Check water pump here
Tightening Torque N.m
Pipe Size(mm)
(2) When tightening the flare nut, use two spanners as shown in Fig.5.2.
6.35 20
φ12.7
60
25 (Liquid Pipe)
18 (Gas Pipe)
840 (Unit)
(mm)
840 (Unit)
180 (Liquid Pipe)
110 (Gas Pipe)
Liquid Pipe Connection
Gas Pipe Connection
(Liquid Pipe Connection)
(Gas Pipe Connection)
127
102
Fig.5.1 Position of Piping Connection
Fig.5.2 Tightening work of Flare Nut