Daikin LREQ5B7Y1 Installation Manual Download

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Installation manual

LREQ5~20B7Y1

Air cooled refrigeration condensing unit

4PW74302-1 – 2012.06

6-2 Protection against contamination when

installing pipes

Protect the piping to prevent moisture, dirt, dust, etc. from entering the
piping.

Note

Exercise special caution to prevent dirt or dust when passing piping
through holes in walls and when passing pipe edges to the exterior.

6-3 Pipe connection

• Be sure to perform nitrogen permutation or nitrogen blow when brazing.

Brazing without performing nitrogen permutation or nitrogen blow
into the piping will create large quantities of oxidized film on the
inside of the pipes, adversely affecting valves and compressors in
the refrigerating system and preventing normal operation.

• The pressure regulator for the nitrogen released when doing the

brazing should be set to 0.02 MPa (about 0.2 kg/cm

:Enough to

feel a slight breeze on your cheek).

Note

Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.

6-4 Drier installation

CAUTION

This product requires that a drier be installed on liquid piping on site.
(Operating the unit without a drier installed may result in equipment
failure.)

Select a drier from the following chart:

• Install the drier in a horizontal orientation wherever possible.
• Install the drier as close to the outdoor unit as possible.
• Remove the drier cap immediately before brazing (to prevent

absorption of airborne moisture).

• Follow instructions in the drier instruction manual concerning drier

brazing.

• Repair any burning of drier paint that occurs during drier brazing.

Contact the manufacturer for more information about paint for
repair use.

• Flow direction is specified for some type of the dryer.

Set the flow direction according to the operation manual of the
dryer.

6-5 Connecting the refrigerant piping

CAUTION

• In addition to gas and liquid shutoff valves, this unit has a

maintenance shutoff valve (see diagram below).

• Do not operate the maintenance shutoff valve*.

(The factory setting for the maintenance shutoff valve is “open.”
During operation, always leave this valve in the open position.
Operating the unit with the valve in the closed position may cause
the compressor to fail.)

Directions to bring out the pipes

The local interunit piping can be connected either forward or to the
sides (taken out through the bottom) as shown in the following
figure.
When passing out through the bottom, use the knock hole in the
bottom frame.

Precautions when knocking out knock holes

• Open knock hole in the base frame by drilling the 4 concave around

it with a 6 mm bit.

• Be sure to avoid damaging the casing
• After knocking out the holes, we recommend you remove any burrs

and paint them using the repair paint to prevent rusting.

• When passing electrical wiring through the knock holes, protect the

wiring with a conduit or bushings, making sure not to damage the
wiring.

Place

Installation period

Protection method

Outdoor

More than a month