Refrigerant Piping; Maximum Pipe Length And Maximum Number Of Bends; Piping Sizes (Flare Connection Type); Piping Connection To The Units - Acson 5CE 35E Installation Manual

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Maximum Pipe Length And Maximum Number Of Bends

•

When the pipe length becomes too long, both the capacity and reliability drop. As the number of bends increases, system

piping resistance to the refrigerant flow increases, thus lowering the cooling capacity, and as the result the front compressor

may become defective. Always choose the shortest path and follow the recommendation as tabulated below:

Indoor

Model

Outdoor

Maximum Length (m)

Maximum Elevation (m)

Maximum No. of Bends

Piping Sizes (Flare Connection Type)

Piping sizes are as follows:

R22

Model

SL35C/CR

Liquid (mm/in)

9.52 / 3/8

Suction (mm/in)

19.05 / 3/4

R410

Model

5SL35C/CR

Liquid (mm/in)

9.52 / 3/8

Suction (mm/in)

15.88 / 5/8

Piping Connection

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Do not use contaminated or damaged copper tubing. If

any piping, evaporator or condenser had been exposed or

had been opened for 15 seconds or more, then vacuum

and purge with field supplied refrigerant. Generally do not

remove plastic, rubber plug and brass nuts from the valves,

fittings, tubing and coils until it is ready to connect suction

or liquid line into valves or fittings.

•

If any brazing work is required, ensure that nitrogen gas is

passed through coil and joints while the brazing work is

being done. This will eliminate soot formation on the inside

wall of copper tubings.

•

Cut the pipe stages by stages, advancing the blade of pipe

cutter slowly. Extra force and a deep cut will cause more

distortion of pipe and therefore extra burr.

•

Remove burrs from cut edges of pipes with a remover.

This will avoid unevenness on the flare face which will

cause gas leak.

•

Align the center of the piping and sufficiently tighten the

flare nut with fingers. Finally, tighten the flare nut with

torque wrench until the wrench clicks.

•

Be sure to execute heat insulation (polyurethane form with

thickness more than 15 mm).

•

Except the outdoor unit which is pre-charge with refrigerant

R22, the indoor unit and the refrigerant connection pipes

must be purged because the air that contain moisture

remaining in the refrigerant cycle may cause malfunction

to the compressor.