Refrigerant Piping Connection - Pioneer YN-M Series Installation Manual

Refrigerant Piping Connection

Safety Precautions
WARNING
• All field piping must be handled by a
licensed technician and must comply with all
local and national regulations.
• If the air conditioner is installed in a small
room, measures must be taken to prevent the
refrigerant concentration in the room from
exceeding the safety limit in the event of
refrigerant leakage. If the refrigerant leaks,
and its concentration exceeds its allowed limit,
hazards due to lack of oxygen may result.
• When installing the refrigeration system,
ensure that air, dust, moisture, or foreign
substances do not enter the refrigerant circuit.
Contamination in the system may cause poor
operating capacity, high pressure in the
refrigeration cycle, explosion, or injury.
• Ventilate the area immediately if refrigerant
leakage occurs during the installation.
Leaked refrigerant gas is both toxic and
flammable. Ensure there is no refrigerant
leakage after completing the installation work.
Refrigerant Piping Connection Instructions
CAUTION
Always keep the ends of the pipes well-sealed
•
by keeping dust caps on or using tape, so that
no foreign material enters during installation.
DO NOT install the connecting pipe until both
•
indoor and outdoor units have been installed.
Insulate both the gas and liquid piping to
•
prevent condensate water damage.
Step 1: Cut pipes
When preparing refrigerant pipes, take extra
care to cut and flare them properly. This will
ensure efficient operation and minimize the
need for future maintenance.
1. Measure the distance between the indoor
and outdoor units.
2. Using a roller-blade pipe cutter, cut the pipe
a bit longer than the measured distance.
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CAUTION
DO NOT deform the pipe while cutting. Be extra
careful not to damage, kink, or deform the pipe
while cutting. This will drastically reduce the
efficiency and capacity of the unit.
1. Make sure that the pipe is cut at a perfect
90° angle. Refer to Fig. 7.1 for examples of
a good cut versus bad cuts.
90°
Oblique
Fig. 7.1
Step 2: Remove burrs carefully.
Burrs can affect the air-tight seal of a refrigerant
piping connection. They must be completely
removed, or at least totally minimized.
1. Hold the pipe at a downward angle to
prevent burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove
all burrs from the cut section of the pipe.
Point down
Step 3: Flare pipe ends
Proper flaring is essential to achieve a tight seal.
1. After removing burrs from cut pipe, seal
the ends with tape to prevent foreign
materials from entering the pipe.
2. Sheath the pipe with insulating material.
3. Place flare nuts on both ends of pipe.
Make sure they are facing in the right
direction, because you can't put them on
or change their direction after flaring.
See Fig. 7.3
Flare nut
Copper pipe
7
Rough Warped
Pipe
Reamer
Fig. 7.2
Fig. 7.3