Panasonic U-72MF2U9 Technical Data Manual page 73

8. Optional Parts
8-4-4. Wiring, Tubing and Heat Insulation
8-4-4-1. Refrigerant tubing
Remove the protection tubes
when connecting to the left side.
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)
NOTE
● 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
Multiple type
solenoid valve kit
8-4-4-2. Heat Insulation
● 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.
Liquid tube
Gas tube
Suction tube
Discharge tube
Liquid tube
Indoor
Indoor
Indoor
Indoor
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)
2 - 57
Design of 3WAY VRF SYSTEM
Remove the protection tubes before connection.
Cool the tubes with damp cloth or other means
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.
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).
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