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Piping between
branching areas (B, b,
C, c)
Piping between
branching areas and
each unit
6-2 Protection against contamination when
installing pipes
Protect the piping to prevent moisture, dirt, dust, etc. from entering the
piping.
Place
Installation period
More than a month
Outdoor
Less than a month
Indoor
Regardless of the period
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.
Refrigerant pipe
Location to
be brazed
Nitrogen
Taping
Handy valve
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
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.
LREQ15+20B7Y1R
Air cooled refrigeration condensing unit
4P360438-1B – 2014.01
Select the piping from the following table in accordance with the total capacity of indoor units connected
downstream
Total capacity of indoor units after branching
less than 4.0 kW
4.0 kW over and less than 14.0 kW
14.0 kW over and less than 30.0 kW
30.0 kW over and less than 50.0 kW
50.0 kW or over
Total capacity of indoor units after branching
Medium temperature
(–20°C or more)
less than 1.0 kW
1.0 kW over and less than 6.0 kW
6.0 kW over and less than 9.9 kW
9.9 kW over and less than 14.5 kW
14.5 kW over and less than 25.0 kW
25.0 kW over and less than 31.0 kW
31.0 kW or over and less than 40.0 kW
40.0 kW or over
No size after branching can exceed the size of any upstream piping.
Adjust the size of the piping so that it will coincide with the size of piping connecting to the indoor unit
Protection method
Pinch the pipe
Pinch or tape the pipe
Regulator
Nitrogen
2
:Enough to
Low temperature
(–20°C or less)
—
less than 1.5 kW
1.5 kW over and less than 2.5 kW
2.5 kW over and less than 3.8 kW
3.8 kW over and less than 5.9 kW
5.9 kW over and less than 9.8 kW
9.8 kW over and less than 19.0 kW
19.0 kW or over
6-4 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.)
* Maintenance shutoff valve
(Do not operate)
* Maintenance shutoff valve
(Do not operate)
Liquid side shutoff valve
(provided with service port)
Gas side shutoff valve
(provided with service port)
Liquid pipe size
Ø6.4 x 0.8 (O type)
Ø9.5 x 0.8 (O type)
Ø12.7 x 0.8 (O type)
Ø15.9 x 1.0 (O type)
Ø19.1 x 1.0 (O type)
Gas pipe size
Ø9.5 x 0.8 (O type)
Ø12.7 x 0.8 (O type)
Ø15.9 x 1.0 (O type)
Ø19.1 x 1.0 (O type)
Ø22.2 x 1.0
(1/2 H or H type)
Ø28.6 x 1.0
(1/2 H or H type)
Ø34.9 x 1.2
(1/2 H or H type)
Ø41.3 x 1.45
(1/2 H or H type)
Installation manual
8
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