Refrigerant Piping Work - Daikin FXLQ20P2VEB Installation And Operation Manual

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 For FXNQ units only
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X Height to reduce
NOTE When mounting the unit to a wall, operating sound may
become bigger.

Refrigerant piping work

For refrigerant piping of outdoor unit, refer to the installation manual
supplied with the outdoor unit.
Before rigging tubes, check which type of refrigerant is used.
All field piping must be provided by a licensed refrigeration
technician and must comply with the relevant local and
national codes.
Use a pipe cutter and flare suitable for the used refrigerant.

To prevent dust, moisture or other foreign matter from infiltrating

the tube, either pinch the end, or cover it with tape.
Place Installation period
More than a month
Less than a month
Regardless of the period
Installation and operation manual
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Protection method
Pinch the pipe
Pinch or tape the pipe
Use copper alloy seamless pipes (ISO 1337).
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The outdoor unit is charged with refrigerant.
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To prevent water leakage, execute heat insulation work
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completely on both sides of the gas and liquid piping. When
using a heat pump, the temperature of the gas piping can reach
up to approximately 120°C. Use insulation which is sufficiently
heat resistant.
Be sure to use both a spanner and torque wrench together when

connecting or disconnecting pipes to/from the unit.
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Do not mix anything other than the specified refrigerant, such as
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air, etc..., inside the refrigerant circuit.
Flares should not be re-used. New ones should be made in
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order to prevent leaks.
Only use annealed flare nuts included with the unit. Using
different flare nuts may cause the refrigerant to leak.
Refer to the table below for the dimensions of flare nut spaces

and the appropriate tightening torque. (Overtightening may
damage the flare and cause leaks.)
Pipe gauge Tightening
(mm) torque (N•m)
Ø6.4 15~17
Ø9.5 33~39
Ø12.7 50~60
Ø15.9 63~75
When connecting the flare nut, coat the flare inner surface with

ether oil or ester oil and initially tighten 3 or 4 turns by hand
before tightening firmly.
Be sure to insulate local piping all the way into the
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pipe connections inside the unit.
Exposed piping may cause condensation or may
cause burns when touched.
After all piping has been connected, use nitrogen to
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perform a gas leak check. A toxic gas may be
released by the refrigerant gas leaking indoor and
being exposed to flames from an area heater, cooking
stove, etc. If the refrigerant gas leaks during the work,
ventilate the area.
Finally, insulate as shown in the figure below.
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2
3
6
4
1 Insulation for gas pipe (accessory part)
2 Sealing pad (accessory part) (wrapped over union)
3 Clamp (4x accessory part)
4 Gas pipe
5 Insulation for liquid pipe (accessory part)
6 Liquid pipe
Torque wrench
Spanner
Piping union
Flare nut
Flare dimension
A (mm) Flare shape
8.7~9.1
90° ±2
12.8~13.2
A
16.2~16.6
19.3~19.7
FXLQ20~63P2VEB + FXNQ20~63P2VEB
VRV System air conditioners
4P323720-1 – 2012.06
R=0.4~0.8