Refrigerant Piping Work - Daikin FXLQ12MVJU Installation Manual

(4) Perform the following procedure to mount the remote
controller (optional accessory) on the unit if desired.
(FXLQ type only)
• Open the left side lid of control panel and mount the lower
case of the remote controller.
See the installation manual
attached to the remote controller
for instructions on screw fasten-
ing and wiring for the remote con-
troller.
CAUTION
Setting the unit at an angle opposite to the drain piping
might cause leaks.
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. (13/16" or thicker) Con-
densate may form on the surface of the insulating material.
Before refrigerant piping work, check which type of refrig-
erant is used. Proper operation is not possible if the types
of refrigerant are not the same.
NOTE
• Use a pipe cutter and flare suitable for the type of
refrigerant.
• 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.
• The outdoor unit is charged with refrigerant.
• Use copple alloy seamless pipes.
• To prevent flare nut cracking and gas leaks, be sure to use
both a spanner and torque wrench together, as shown in the
drawing, when connecting or disconnecting pipes to / from
the unit.
• Refer to Table 2 for the dimensions of flare.
• When connecting the flare nut, coat the flare section (both
inside and outside) with ester oil or ether oil, rotate three or
four times first, then screw in.
• Refer to the Table 2 for tightening torque.
5
• After inspecting pipe joints for gas leakage, be sure to insu-
late with the accessory joint insulation for fitting (3) (4) while
referring to the figure below.
(Fasten both ends with clamps (6)).
• Wrap only the gas line side with the sealing pad (5). Bend the
pad over the insulation for fitting (union) from above.
Use " Table 3 " as a reference if a torque wrench is not available.
Once work is complete, make sure there is no gas leaking. As
the flare nut is tightened with the wrench, the torque will sud-
denly increase. From that position, tighten the nut to the angle
shown on " Table 3 ".
• Make absolutely sure to execute heat insulation works on the
pipe-connecting section after checking gas leakage by thor-
oughly studying the following figure and using the attached
heat insulating materials for fitting (3) and (4). (Fasten both
ends with the clamps (6) (accessory).) (Refer to Fig. 1)
CAUTION
Be sure to insulate any field piping all the way to the piping
connection inside the unit. Any exposed piping may cause
condensate or burns if touched.