Panasonic U-120MF2U9, Technical Data Manual, Page: 73 / 181

Design of 3WAY VRF SYSTEM
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8-4-4. Wiring, Tubing and Heat Insulation
8-4-4-1. Refrigerant tubing
Remove the protection tubes before connection.
Cool the tubes with damp cloth or other means
Remove the protection tubes
when connecting to the left side.
Cool the tubes with damp cloth or other means
when brazing the joint with a torch.
Otherwise, the solenoid valve will be damaged.
Cool even when removing protection tubes.
Cool with damp cloth or other means
when brazing the joint with a torch.
Otherwise, the solenoid valve will be
damaged.
(Only in the case of left side connection)
Discharge tube
Liquid tube
Liquid tube
Suction tube
Gas tube
*
In the case of left side connection, remove
the left side protection tubes and install
supplied protection tubes (3 types)
on the right side(Brazing connection).
NOTE
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When brazing, be sure to perform nitrogen replacement inside the tube so that oxidation coating does not form
inside the tube. Then stop performing when nitrogen replacement is completed. The solenoid valve, however,
will be damaged if nitrogen is applied while brazing.
Heat sensitive components, protect from flame and heat conduction.
Comply with all Local Code Requirements.
Branch tubing from each port has to be in a position with 15~30° upward by 7-7/8” (200 mm) or more.
(same manner as normal branch tubing)
Outdoor
Indoor
Indoor
Indoor
Indoor
Multiple type
solenoid valve kit
Branch tubing from each port has to be in a position
with 15~30° upward by 7-7/8” (200 mm) or more.
(same manner as normal branch tubing)
8-4-4-2. Heat Insulation
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Be sure to insulate the tubing after finishing leakage inspection.
Wrap insulators (field supplied) with the heat resistance of 248°F or more around the discharge tubes and gas
tubes, and 176°F or more around the suction tubes and liquid tubes.
Wrap around the each tube not to make gaps between the thermal insulation.
Failure to conduct shielding gaps and thermal insulation will cause water leakage.
Insulate the protection tubes of outdoor unit side and indoor unit side.
8. Optional Parts
TD831183-00_北米向け3WAY.indb 57 15/12/17 16:05:26