Daikin FXVQ125MY1, Installation Manual

Page: 6 / 12

5 English
6-2 HOW TO WORK THE REFRIGERANT
PIPING
Remove the pinched pipings brazed to the end of the internal
piping.
Braze and connect the standard accessory piping.
Connection pipings
Do not directly
flame the pipe
fixing plate.
Do not directly
flame the
solenoid valve and
motor operated valve.
Air filter must
be removed.
Remove the pinched pipings.
Do not directly flame the
drain pan and thermistor.
6-3 PIPING CONNECTION
CAUTION
Do not use anti-oxidants when brazing the piping joints.
Residue can clog pipings and break equipment.
• Be sure to perform a nitrogen blow when brazing
Brazing without performing nitrogen replacement or
releasing nitrogen into the piping will create large
quantities of oxidized film on the inside of the pipings,
adversely affecting valves and compressors in the
refrigerating system and preventing normal operation.
Note
• For nitrogen replacement, refer to the installation work
manual. (Contact the dealer.)
• When brazing pipes while flowing nitrogen, set the nitrogen
pressure to 0.02 MPa or less using a pressure reducing
valve (to the extent that your cheeks feel breeze).
• Do not use a flux when brazing the refrigerant system. Use
phosphor copper brazing (BCup-2: JIS Z 3264/B-Cu93P-710
/795: ISO 3677
) which does not require flux.
Using a chorine flux may cause the pipes to corrode,
and if it contains fluoride, it may cause the refrigerant
lubricant to deteriorate, adversely affecting the
refrigerant piping system.
Refrigerant piping
Manual valve
Location to be brazed
Nitrogen
Taping
Nitrogen
Pressure reducing valve
CAUTION
Do not let any refrigerant other than R410A enter the
refrigerant system.
Ventilate if the refrigerant gas leaks during work.
6-4 PROCESSING METHOD OF CONNECTION
PIPING
• See the following table for the Processing connection
piping.
• For right side piping, replace the partition bush fixed on the
right side panel with the bush for hole fixed on the left side
panel.
Left side piping connection Right side piping connection
Piping
on liquid
side
(125-250
type)
• Pass the piping from
the hole on the left side
into the unit, conduct
sleeve flare process
and brazed connection.
Note)
Inside dia. of Flare
(See the table for
flare part dimensions
)
• Pass the piping from
the hole on the right
side into the unit,
conduct sleeve flare
process and brazed
connection.
Note)
Inside dia. of Flare
(
See the table for flare
part dimensions)
Piping on
liquid side
(400 · 500
type)
Connect the accessory
pipes and bring them
outside of the unit.
Modify the accessory left
side piping and use it for
the right side.
( )
For left side For right side
Cut the
piping
Connection side
inside the unit
Flare the pipe end or
use the fitting and connect
the piping by brazing.
Piping on
gas side
(125-500
type)
6-5 THE TABLE FOR FLARE PART
DIMENSIONS
Refer to the below table for flare part dimensions
(Unit: mm)
Indoor
unit
capacity
Piping
size
Inside dia. of
flare
Allowance of
inserting part
Bend
radius
Flare shape
d0 d1 Tolerance L Tolerance
125 type
φ
9.5
×t0.8 or
more
9.64
+0.1
0
7
+1.5
0
R18
φ
d1
φ
d0
C1220T
L
200 type
250 type
Note
Braze by socket if sleeve flare process cannot be conducted.
CAUTION
Thermal insulation of the field piping must be carried out
including the piping connection parts. Otherwise, it may
cause heat injury by condensation or connecting to the
exposed piping.
• Secure the piping so that it does not touch the wiring.
• Insulation of pipes must be perfectly carried out without
leaving any clearance to avoid condensation.
• When connecting liquid and gas connection pipings,
insulate all the internal pipings with field supplied insulation
material for refrigerant pipings. (See following sketch.)
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01_EN_3P345056-4F.indd 5 9/3/2015 15:00:24