Outdoor Unit; Refrigerant Piping Connections - York RVHC 09-12DS Installation & Owner's Manual

OUTDOOR UNIT

■ Fixing and Piping
• Piping must be performed by qualifi ed personnel ac-
cording to good refrigeration systems practices.
• Piping materials and insulation materials must be of
refrigerant quality.
• Select the pipe diameters according to the size of unit
and cut the pipe to design length by using pipe cut-
ter.
• Install the fl are nuts and fl are the end of the pipes.
• Check that no foreign bodies are inside the piping.
• Align the central of the connecting pipes and tighten
the fl are nut.
• Fix piping with pipe clamps and check that any pipe
vibrations cannot be transmitted to the building struc-
ture.
NOTES
• Connect the pipe correctly.
• Do not apply the excessive torque.
• Use an appropriate bending tool to form curves and
avoid over-tightening the refrigerant tubes.
• To prevent heat loss, the two lines must be insulated
separately.
■ Maximum Piping Length
Unit size
7
(m) 10
The suction line must have a 2% gradient up to the
compressor on horizontal sections.
Where piping lengths are unusually long and include a
large number of oil traps, it may be necessary to adjust
to compressor charge.
10
ENGLISH
J355-EN.indd 10 J355-EN.indd 10
Refrigerant charge to be added per extra meter
of piping length when more than 7.5 meters.

■ Refrigerant piping connections

To avoid alteration of unit capacities, check that piping
lengths and changes in elevation are kept to a strict
minimum.
Before connectiong the refrigerant lines, follow the
procedures below (if pre-charged connection lines are
not supplied):
• Select copper pipe diameters according to the size of
• Install the refrigeration lines, checking that no foreign
• Install the fl are connectors and fl are the ends of the
• Evacuate the piping. This operation, which should last
MODELS
9 12 18
15 18 20
MODELS
Unit size
7 9
g/m 30 30
(FLARE connections)
unit to be installed.
bodies get inside the piping.
pipes.
at least 15 minutes if there are large piping lengths and
changes in elevation, should be followed by a leak test.
12 18
30 30
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