Refrigerant Piping - McQuay D Serie Manual De Instalación

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Maximum Pipe Length And Maximum No. Of Bends

When the pipe length becomes too long, both the capacity and reliability will drop and as the no. of bends increases, system piping

resistance to the refrigerant flow increases, thus lowering the capacity. As a result the compressor may fail. Always choose the shortest

path and follow the recommendations as tabulated below:-

Model

Max. Length

Max. Elevation

Max. no. of Bends

Model

Max. Length

Max. Elevation

Max. no. of Bends

Bending must be carefully made so as not to crush the pipe. Use a pipe bender to bend a pipe where possible.

•

Our guarantee on the performance of our air-conditioners is strictly revoked if the height, length and/or no. of bends

of the refrigerant piping system installed is beyond the limit above.

Remark:

For cooling unit SL 60/4SL 60, recommended to add 6 kg, MSS / 4MSS 75 (6 kg) & MSS / 4MSS 100 (10 kg) external

accumulator respectively.

Piping Works & Flaring Technique

•

Do not use contaminated or damaged copper tubing. If any

pipings, 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 plugs and brass nuts from the valves, fittings, tubings

and coils until it is ready to connect suction or liquid line into

valves or fittings.

•

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

passed through coil and joints while the brazing work is being

done. This will eliminate soot formation on the inside walls of

the copper tubings.

•

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

cutter slowly. Extra force and deep cut will cause more

distortion on the pipe and thus extra burr. See figure.

•

Remove burrs from cut edges of the pipes with remover as

shown in the figure. This will avoid unevenness on the flare

faces which will cause gas leak. Hold the end of the pipe

downwards to prevent metal chips from entering the pipe.

•

Insert the flare nuts, mounted on the connection parts of both

the indoor unit and outdoor unit, onto the copper pipes.

•

The exact length of pipe protruding from the face of the flare

die is determined by the flaring tool. See figure. The table shows

the use of an imperial die and rigid die.

•

Fix the pipe firmly on the flare die. Match the centers of both

the flare die and the flaring punch, and then tighten the flaring

punch fully.