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12
CAUTION
For local insulation, be sure to insulate local piping all the way into the pipe connections inside the
machine.
Exposed piping may cause condensation or burns on contact.
•
Make absolutely sure to execute heat insulation works on the pipe-connecting section after checking gas
leakage by thoroughly studying the following figure and using the attached heat insulating materials for
fitting (8) and (9). (Fasten both ends with the clamps (4).)
(Refer to Fig. 16)
• Wrap the sealing pad (11) only around the insulation for the joints on the gas piping side.
(Refer to Fig. 16)
• Always ensure that the joins on the insulating materials for fitting (8) and (9) are facing up.
Gas Piping Insulation Procedure
Insulation for fitting (8)
(accessory)
Flare nut connection
Piping insulation
material (main unit)
Attach to base
Wrap over from the
base of the unit to
the top of the flare
nut connection.
Main unit
Clamp (4) (accessory)
Tighten the part other than
the piping insulation material.
Piping insulation
material (Field
supply)
Turn seams up
Sealing pad
medium-1 (11)
(accessory)
Liquid Piping Insulation Procedure
Insulation for fitting (9)
(accessory)
Flare nut connection
Turn seams up
Piping insulation
material (Field
supply)
Tighten the part other than the
piping insulation material.
Sealing pad
medium-2 (12)
(accessory)
Wrap the insulator
around the part
from the root.
Piping insulation
material (main unit)
Attach to base
Main unit
Pipe holding
plate screw
(2 points)
Gas piping
Liquid piping
Fig. 16
• When brazing the refrigerant piping, only begin brazing after having carried out nitrogen
substitution or while inserting nitrogen into the refrigerant piping.
Once this is done, connect the indoor unit with a flared or a flanged connection.
Refrigerant
piping
Part to
bebrazed
Nitrogen
Taping
Hands
valve
Pressure-reducing
valve
Nitrogen
Fig. 17
•
Nitrogen should be set to 0.02MPa with a pressure-reducing valve if brazing while inserting nitrogen into
the piping.
(Refer to Fig. 17)
• Do not use flux when brazing refrigerant piping. Therefore, use the phosphor copper brazing filler metal
(BCuP-2: JIS Z 3264/B-Cu93P-710/795: ISO 3677) which does not require flux. (Flux has extremely
harmful influence on refrigerant piping systems. For instance, if the chlorine based flux is used, it will cause
pipe corrosion or, in particular, if the flux contains fluorine, it will damage the refrigerant oil.)
•
When the airtight test is performed for the indoor unit and inter-unit piping after indoor unit installation, be
sure to refer to the installation manual for the indoor unit or technical guide for airtight pressurization and
refrigerant piping installation.