Refrigerant Piping Work - Daikin FCQ71DV3B Installation Manual

<Ceiling work>
(1-3) Adjust the unit to the right position for installation.
(Refer to "4. PREPARATIONS BEFORE INSTALLATION-(1)".)
(1-4) Check the unit is horizontally level.
CAUTION
• The indoor unit is equipped with a built-in drain pump and float
switch. Verify that it is level by using a level or a water-filled
vinyl tube.
(If the unit is tilted against condensate flow, the float switch may
malfunction and cause water to drip.)
(1-5) Remove the washer fixing plate (7) used for preventing the
washer from falling and tighten the upper nut.
(1-6) Remove the paper pattern for installation (5).
(2) For existing ceilings
(2-1) Install the indoor unit temporarily.
• Attach the hanger bracket to the suspension bolt. Be sure to fix it securely by using nut and washer from
upper/lower sides of hanger bracket. If you use the washer fixing plate (7), it will prevent the falling of
the washer.
Tighten (double nuts)
[Securing the hanger bracket]
(2-2) Adjust the height and position of the unit.
(Refer to "4.PREPARATIONS BEFORE INSTALLATION-(1)".)
(2-3) Perform steps (1-4), (1-5) in (1) For new ceilings.

6. REFRIGERANT PIPING WORK

〈For refrigerant piping of outdoor units, see the installation manual attached to the outdoor unit.〉
〈Execute heat insulation work completely on both sides of the gas piping and the liquid piping. Otherwise, a
water leakage can result sometimes.〉
(When using a heat pump, the temperature of the gas piping can reach up to approximately 120°C, so use
insulation which is sufficiently resistant.)
〈Also, in cases where the temperature and humidity of the refrigerant piping sections might exceed 30°C or
RH80 %, reinforce the refrigerant insulation. (20 mm or thicker) Condensate may form on the surface of the
insulating material.〉
〈Be sure to check the type of R410A refrigerant to be used before doing any work. (Using an incorrect refrig-
erant will prevent normal operation of the unit.)〉
CAUTION
• Use a pipe cutter and flare suitable for the type of refrigerant.
• Apply ester oil or ether oil around the flare section before connecting.
• To prevent dust, moisture or other foreign matter from infiltrating the tube, either pinch the end or cover
it with tape.
• Do not allow anything other than the designated refrigerant to get mixed into the refrigerant circuit, such
as air, etc. If any refrigerant gas leaks while working on the unit, ventilate the room thoroughly right away.
English
Field supply
Washer (3) (attached)
Hanger bracket
Fig. 13
Level
[Maintaining horizontality]
Insert
Washer fixing plate (7)
(attached)
[Securing the washer]
Fig. 14
Vinyl tube
Fig. 12
9