Daikin BSVQ36PVJU, Installation Manual

Page: 9 / 19

English 8
6. REFRIGERANT PIPING WORK
• For instruction for installing piping between the outside unit and BS unit, selecting a refrigerant branch kit,
and installing piping between the refrigerant branch kit and the indoor unit, refer to the installation manual
and equipment design materials included with the outside unit.
• Before beginning the work, always check to make sure the type of refrigerant used is R410A. (The unit will
not operate correctly with a different type of refrigerant.)
• Insulate all of the piping including the liquid pipes, HP/LP gas pipes, suction gas pipes, gas pipes, equalizer
pipes (piping between outside units when an outside multi-unit system), and the pipe connections for these.
Not insulting these pipes could result in water leaks or burns. In particular, suction gas flows in the HP/LP
gas piping during full cooling operation, so the same amount of insulation as used for the suction gas piping
is required. In addition, high-pressure gas flows in the HP/LP gas piping and gas piping, so use insulation
that can withstand more than 250°F.
• Reinforce the insulation material when necessary for the installation environment. Refer to the following as
a guideline.
• For 86°F, RH75% to 80%: Thickness at least 9/16 in.
• For 86°F, over RH80%: Thickness at least 13/16 in.
If not reinforced, condensation could form on the surface of the insulation. For details, refer to the Engineer-
ing data book.
NOTES
• This product only uses the new refrigerant (R410A). Be sure to use the special pipe cutters for R410A, dur-
ing installation.
• Make sure that nothing besides the specified refrigerant, such as air, gets into the refrigerant piping.
• If refrigerant gas leaks during the work, ventilate the area. (The outside units are filled with refrigerant.)
6-1 PIPING MATERIAL SELECTION
• Use only pipes which are clean inside and outside and which do not accumulate harmful sulfur, oxidants,
dirt, cutting oils, moisture, or other contamination. (Foreign materials inside pipes including oils for fabrica-
tion must be 9 mg/10 ft or less.)
• Use the following items for the refrigerant piping.
Material : Jointless phosphor-deoxidized copper pipe
Size : See “Example of connection” to determine the correct size.
Thickness : Select a thickness for the refrigerant piping which complies with national and local laws.
For R410A, the design pressure is 478 psi.
• For information regarding the piping allowable maximum length, allowable height difference, and allowable
length after a branch, refer to the installation manual that came with the outside unit or Engineering data book.
• The refrigerant branch kit (sold separately) is required for piping branches. For information on how to select a
refrigerant branch kit, refer to the Installation Manual that came with the outside unit or Engineering data book.
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.
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