Haier 1UH071N1ERG [139/238] Smart power

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7.4.2 Piping Materials

Types of Copper Pipes (Reference)

Maximum Operation Pressure Applicable Refrigerants

3.4MPa R22, R407C

4.15MPa R410A

• Use pipes that meet the local standards.

Piping Materials/Radial Thickness

Use pipes made of phosphorus deoxidized copper.

Since the operation pressure of the units that use R410A is higher than that of the units for use with R22, use pipes

with at least the radial thickness specied in the chart below. (Pipes with a radial thickness of 0.7mm or less may

not be used.)

Size (mm) Size (inch) Radial Thickness (mm) Type

Ф6.35 1/4'' 0.8t

Type-O pipes

Ф9.52 3/8'' 0.8t

Ф12.7 1/2'' 0.8t

Ф15.88 5/8'' 1.0t

Ф19.05 3/4'' 1.0t Type-1/2H or H pipes

• Although it was possible to use type-O for pipes with a size of up to 19.05 (3/4") with conventional refrigerants,

use type- 1/2H pipes for units that use R410A. (Type-O pipes may be used if the pipe size is 19.05 and the radial

thickness is 1.2t.)

• The table shows the standards in Japan. Using this table as a reference, choose pipes that meet the local

standards.

Flare Machining (type-O and OL only)

The are machining dimensions for units that use R410A is larger than those for units that use R22 in order to

increase air tightness.

Flare Machining Dimension (mm)

External dimension

of pipes

Size

Dimension A

R410A R22

Ф6.35 1/4" 9.1 9.0

Ф9.52 3/8" 13.2 13.0

Ф12.7 1/2" 16.6 16.2

Ф15.88 5/8" 19.7 19.4

Ф19.05 3/4" 24.0 23.3

If a clutch type are tool is used to machine ares on units that use R410A, make the protruding part of the pipe

between 1.0 and 1.5mm. Copper pipe gauge for adjusting the length of pipe protrusion is useful.