Precautions To Refrigerant Piping Connection - Daikin RZQ200MY1 Installation Manual

Front Electrode
Compressor sound-proof material
Flames
Electrode
Top view
• Be sure to charge nitrogen into the pipe when brazing.
Be sure to perform nitrogen purge or nitrogen charge when
brazing. Failure to do this will create large quantities of oxide film
on the inside surface of the pipes, which would adversely affect
the valves and compressors in the refrigerating system and
prevent the normal operation.
Note
• When charging nitrogen before brazing, the pressure
regulator must be set to 0.02 MPa (0.2 kg • f/cm
slight breeze on your cheek).
• Do not charge other refrigerant other than the specified one
for the refrigerating system.
• Do not charge the air for the refrigerating system.
CAUTION
Do not use flux when brazing the refrigerant piping.
Use the phosphor copper electrode which does not require flux
(BCu93P-710/795:ISO 3677).
(Flux has extremely harmful influence on refrigerant piping
system. 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 and adversely affect the refrigerant
piping system.)
Refrigerant piping
Location to be brazed
Nitrogen
Packing
• After finishing the piping connection and evacuation, be
sure to open the valves.
Operation with the stop valve closed will result in the
compressor malfunction.
Under some circumstances, the sound of sizzling will not be
heard even the stop valves have been opened. This is not
malfunction.
Welding torch
Right
Welding torch
Gas side
Liquid side
or less: as a
2
Pressure-reducing valve
Manual valve

7-5 Precautions to refrigerant piping connection

• The field piping can be connected in 4 directions.
Front plate screw
Front
Piping cover plate
(front) screw
• While connecting downward, open up round holes (knockout
holes) by drilling through the central parts of the knockout holes
(4 places) with a Ø6mm bit.
Notch
• After drilling through the knockout holes, it is recommended to
coat the notches at the edge and the area around them with
anti-corrosion paint to prevent rusting.
• When leading the electric wires through the knockout hole, wrap
the wires with the protective tape to avoid damage.
Connect the piping forward
Gas side accessory
piping (1)
Gas side piping
(field supply)
Cut the piping to
the required length
Connect the piping backward
Gas side accessory
piping (2)
Gas side accessory
piping (1)
Connect the piping sideward
Gas side accessory
piping (2)
Front plate
Piping cover plate
Back
Side
Bottom
Central part of
Bit
the knockout hole
Knockout hole
Notch
Gas side accessory
piping (2)
Gas side piping
(field supply)
Gas side accessory
piping (1)
Gas side piping
(field supply)
Cut the piping to
the required length
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