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LREQ5~20B7Y1
Air cooled refrigeration condensing unit
4PW74302-1D – 2016.11
Installation manual
8
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
2
: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.)
1.
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
Pinch the pipe
Less than a month
Pinch or tape the pipe
Indoor
Regardless of the period
Model
Required dryer core
(recommended type)
LREQ5
LREQ6
80 g (100% molecular sieve equivalent)
(DML083/DML083S : Danfoss made)
LREQ8
LREQ10
LREQ12
160 g (100% molecular sieve equivalent)
(DML163/DML163S : Danfoss made)
LREQ15
LREQ20
160 g (100% molecular sieve equivalent)
(DML164/DML164S : Danfoss made)
Refrigerant pipe
Regulator
Handy valve
Taping
Nitrogen
Nitrogen
Location to
be brazed
Liquid side shutoff valve
(provided with service port)
Gas side shutoff valve
(provided with service port)
* Maintenance shutoff valve
(Do not operate)
(Do not operate)
* Maintenance shutoff valve
Right-side connection
Front connection
Left-side connection
Knock hole
Concave section
(4 places)
Drill
4PWEN74302-1D.book Page 8 Thursday, April 27, 2017 9:01 PM