Refrigerant Piping - McQuay IM-WMX-0603 Manual De Instalación

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Piping Length & Elevation

If the pipe is too long, both the capacity and reliability of

the unit will drop. As the number of bends increases, resis-

tance to the flow of refrigerant system increases, thus low-

ering cooling capacity. As a result the compressor may be-

come defective. Always choose the shortest path and fol-

low the recommendations as tabulated below:

Model

Max. length, L (m)

Max. elevation, H (m)

Max. number of bends

Liquid pipe size

Gas pipe size

Remark: The refrigerant pre-charged in the outdoor unit is for

piping length up to 7.62m.

Piping Works

•

Do not use contaminated or damaged copper tubing. Do

not remove plastic, rubber plugs and brass nuts from the

valves, fittings, tubings and coils until you are 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 connection pipe with a pipe cutter.

•

Remove burrs from cut edges of the pipes with remover.

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.

•

Flare the pipe with extra length above the flaring tool as

shown in the table.

•

The flared edge must be even and not cracked or

scratched.

Piping Connection To The Units

•

Align the center of the piping and tighten the flare nut

sufficiently with fingers.

•

Finally, tighten the flare nut with the torque wrench

until the wrench clicks.

Pipe Size (mm)

6.35

9.53

12.7

15.88

19.05

Copper tube

Swaging block

Ø Tube, D

Inch

1/4"

6.35

3/8"

9.52

1/2"

12.70

5/8"

15.88

3/4"

19.05