Panasonic U-72MF1U9 Technical Data Manual page 67

7. Optional Parts
How to use the fittings
Suspension hook
Install the hanging hook with supplied 4 screws (M4 X 15/32") taking care of the positioning.
CAUTION
4. Wiring, Tubing, and Heat Insulation
1. Refrigerant tubing
Gas tube
Liquid tube
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 during while brazing.
Heat sensitive components, protect from flame and heat conduction.
Comply with all Local Code Requirements.
Clean base metals throughly.
Use proper ventilation to carry fumes away from the work area.
Use a high quality silver based solder of at least 15% silver.
Heat the base materials broadly and uniformly.
Take precautions not to overheat the device which could damage sensitive internal components.
Insure compliance with all local codes!
2. Heat Insulation
Be sure to insulate the tubing after finishing leakage inspection.
Wrap insulators (field supplied) having a thickness of 25/64" or more with the heat resistance of 248
around the discharge tubes and gas tubes, and 176
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.
Suspension bolt (3/8" or M10) (field supplied)
Washer
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.
Nut (field supplied) (3/8" or M10)
M4 screw (M4 × 15/32")
M4 screw (M4 × 15/32" : supplied )
Never use a long screw
other than the accessory screw.
This may bore a hole through
the tube surface, causing
refrigerant leakage.
Discharge tube
Liquid tube
Suction tube
or more around the suction tubes and liquid tubes.
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Design of 3WAY VRF SYSTEM
or more
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