Panasonic U-72MF2U9 Technical Data Manual page 66

8. Optional Parts
How to use the fittings
Suspension hook
1
Install the Suspension hook with supplied 4 screws (L=15/32" (12mm)) taking care of the positioning.
CAUTION
2
8-3-4. Wiring, Tubing and Heat Insulation
8-3-4-1. Refrigerant tubing
3
Liquid tube
4
Gas tube
5
NOTE
● When brazing, be sure to perform nitrogen replacement inside the tube so that oxidation coating does not form
6
inside the tube. Then stop performing when nitrogen replacement is completed. The solenoid valve, however,
will be damaged if nitrogen is applied during while brazing.
● Heat sensitive components, protect from flame and heat conduction.
● Comply with all Local Code Requirements.
8-3-4-2. Heat Insulation
7
● 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.
8
9
Wrong positioning will become unfitted center of gravity position,
causing injuries or product damage.
Cool with damp cloth or other means when brazing the joint with a torch.
Otherwise, the solenoid valve will be damaged.
Suspension bolt (3/8" or M10) (field supplied)
Nut (field supplied) (3/8" or M10)
Washer (supplied)
● Tapping screw (L=15/32"(12mm) : supplied )
● Never use a long screw
other than the accessory screw.
This may bore a hole through
the tube surface, causing
refrigerant leakage.
Liquid tube
2 - 50
Design of 3WAY VRF SYSTEM
Suction tube
Discharge tube