Refrigerant Piping - McQuay CE-C Serie Manual De Instalación

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If the outdoor condensing unit is operated in an atmosphere containing oils (including machine oils), salt (coastal area),

sulfide gas (nearby hot spring or oil refinery plant), such substances may lead to failure of the unit.

Maximum Pipe Length And Maximum Number Of Bends

If the pipe length is too long, both the capacity and the

reliability of the unit will decrease. As the number of bends

increases, resistance of the piping system to the refrigerant

flow increases and thus lowering the capacity, as a result

the compressor may become defective. See Figure N and

Figure O.

Fig. N

Indoor Unit

Outdoor Unit

Piping Works And 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 P.

•

Remove burrs from cut edges of the pipes with remover

as shown in Figure O. 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 R.

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.

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.

•

When tightening the flare nut with the torque wrench,

ensure that the tightening direction follows the arrow

indicated on the wrench.

! Caution