Hitachi RCIM-2.0FSN - 11.2.1. REFRIGERANT PIPING SELECTION; Pipe Size Selection; 11.2.2. CONNECTING FLARE ADAPTER; Flare Adapter Usage

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REFRIGERANT PIPING & REFRIGERANT CHARGE
 The possible combination between Outdoor Unit and Indoor Unit are the following:
Single System
 NOTE:
L are the Length indicated in the chart.
Units Mark
Maximum Piping Length
RAS-2/2.5HVRN1 L
Actual piping length  50m
Equivalent piping length  70m
11.2.1. REFRIGERANT PIPING SELECTION
 Piping connection size of Outdoor Unit and, Indoor Unit
Pipe Size
Outdoor Unit
Gas Pipe Liquid Pipe
2.0~2.5 HP
∅12.70 (1/2) ∅6.35 (1/4)
Indoor Unit Gas piping Size Liquid piping Size
2.0 HP
∅15.88 (5/8) ∅6.35 (1/4)
2.5 HP
∅15.88 (5/8) ∅9.53 (3/8)
11.2.2. CONNECTING FLARE ADAPTER
The piping sizes for indoor unit and outdoor unit are
different. Attach the flare adapter (accessories) at the
indoor piping union part.
Use the adequate flare adapter as follows:
Flare adapter
Indoor unit
Gas pipe Liquid pipe
2.0 HP
Big size
(
∅ 15.88= ∅ 12.70)
-
2.5 HP
Big size
(
∅ 15.88= ∅ 12.70)
Small size
( ∅9 .53= ∅6 .35)
11.3. TIGHTENING FLARE NUTS
The required tightening torque is as follows:
Pipe Size Tightening Torque (Nm)
Ø 6.35 mm 20
Ø 9.53 mm 40
Ø 12.70 mm 60
Ø 15.88 mm 80
Gas line
Flare adapter
(accessories)
Indoor unit
Liquid line
Pipe
(Field
supplied)
Flare Nut
(accessories)
Pipe
(Accessories)