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ENGLISH
YORK INSTALLATION & OWNER’S MANUAL (EN) 035M80090-000
Fixing and piping
• Piping must be performed by qualified personnel
according to good refrigeration system 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
cutter.
• Install the flare nuts and flare the end of the pipes.
• Check that no foreign bodies are inside the piping.
• Align the center of the connection pipes and tighten
the flare nut.
• Fix piping with pipe clamps and check that any pipe
vibrations cannot be transmitted to the building
structure.
NOTE
• 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 18 24 48
(m) 20 20 25
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.
Refrigerant charge to be added per extra
meter of piping length when more than 5
meters.
Unit size
Models
18 24 48
g/m
30 65 90
Prefabricated refrigerant piping is available as an
accessory. If this is not used, piping and insulating
materials employed must be compatible with this type
of installation.
The pre-charged outdoor unit does not require charging
if piping length is 5 m or less. However, the inter-
connecting piping and the indoor unit must be pumped
down before releasing R22 refrigerant into them
from the outdoor unit.
1. Remove the cap from the service valve.
2. Connect the line to a vacuum pump and pump down
to 5 Pa.
3. When pump down is finished, wait 15 minutes to
detect potential circuit leakage. Open service valves
on the outdoor unit.
REFRIGERANT PIPING CONNECTIONS
* Note: The expansion device is located in the outdoor unit.
L
L
H
D
Indoor unit
Gas line
Liquid line
R22
Outdoor unit
Low pressure High pressure
Manifold
Pressure tap
Liquid valve
Gas valve
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