Refrigerant Piping Work - Daikin FCQ18PAVJU Installation Manual

<Ceiling work>
(1-3) Adjust the unit to the right position for installation.
(Refer to "4. PREPARATIONS BEFORE INSTALLATION-(1)".)
• Using the Installation guide (15) allows you to check the positions from the underside of the unit to the
lower ceiling surface.
(1-4) Check the unit is horizontally level.
• 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.
CAUTION
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.
Perform step (1-1) in (1) For new ceilings.
(2-2) Adjust the height and position of the unit.
(Refer to "4. PREPARATIONS BEFORE INSTALLATION-(1)" and (1-3) in (1) For new ceilings.)
(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 250°F, so use
insulation which is sufficiently resistant.)
〈Also, in cases where the temperature and humidity of the refrigerant piping sections might exceed 86°F or
RH80%, reinforce the refrigerant insulation. (13/16in. 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.)〉
10
Apply the short
side of the
cut-out section.
Lower ceiling
surface
Installation guide (15)
(accessory)
Underside of
the unit
Level
[Maintaining horizontality]
Fig. 13
Vinyl tube
English