Refrigerant Piping Work - Daikin FXCQ20MVE Installation Manual

Part to be procured in the field
Tighten
(double nut)
[ Securing the hanger bracket ]
Washer fixing plate
[ Securing the washer ]
[ For new ceilings ]
(2) Refer to the paper pattern for installation for ceiling
opening dimension. Consult the builder or carpenter
for details.
• The center of the ceiling opening is indicated on the
paper pattern for installation.
• After cutting out a slit for the unit in the center of the paper
pattern for installation (accessory), install with the 4
screws (accessory).
• Fold the guide section of paper pattern for installation and
adjust the height of the unit so the notch in the guide is at
the position where you expect the ceiling surface to be.
Paper pattern
for installation
(accessory)
Screws (× 4 accessory)
[ Installation of paper pattern for installation ]
Ceiling
Lower
surface
of the
ceiling
Paper pattern
for installation
(accessory)
[ Unit height adjustment ]
 Ceiling work 
(3) Adjust the unit to the right position for installation.
(Refer to "PREPARATIONS BEFORE INSTALLATION-(1)".)
English
Washer (accessory)
Hanger bracket
Insert
(accessory)
Cut-out section
Guide section (4 corners)
(4) Check the unit is horizontally level.
Level
CAUTION
The indoor unit is equipped with a built-in drain pump
and float switch. At each of the unit's 4 corners, verify
that it is level by using a level or a water-filled vinyl
tube. (If the unit is inclined against condensate flow,
the float switch may malfunction and cause water to
drip.)
(5) Remove the washer fixing plate used for preventing the
washer from falling and tighten the upper nut.
(6) Remove the paper pattern for installation.
[ For existing ceilings ]
(2) Adjust the height of the unit.
Cut out the guide section of the paper pattern for installation
attached, place on the bottom surface of the unit, and adjust
the height of the unit so that the notch of the guide matches
the lower surface of the ceiling.
The unit body
Ceiling
Lower
surface of
the ceiling
[ Unit height adjustment ]
(3) Perform steps (3), (4), (5) in For new ceilings.
6.

REFRIGERANT PIPING WORK

• For the outdoor unit refrigerant piping, refer to the installation
manual attached to the outdoor unit.
• Carry out insulation of both gas and liquid refrigerant piping
securely. If not insulated, it may cause water leakage. For
gas piping, use insulation material of which heat resistant
temperature is not less than 120°C.
For use under high humidity, strengthen the insulation mate-
rial for refrigerant piping. If not strengthened, the surface of
insulation material may sweat.
• Before installation work, make sure that the refrigerant is
R410A. (Unless the refrigerant is R410A, the normal opera-
tion cannot be expected.)
CAUTION
This air conditioner is a dedicated model for new refrig-
erant R410A. Make sure to meet the requirements shown
below and carry out installation work.
• Use dedicated piping cutters and flaring tools for
R410A.
• When making a flare connection, coat the flared inner
surface only with ether oil or ester oil.
• Use only the flare nuts attached to the air conditioner.
If other flare nuts are used, it may cause refrigerant
leakage.
Vinyl tube
The guide portion
5