Refrigerant Piping Work - Daikin FTQ18TAVJUA Installation Manual

5.

REFRIGERANT PIPING WORK

Observe the requirements listed below for refrigerant tubing
sizes.
Refer to Figure 7 and 8 for the location of the components
referenced in the following steps.
Drain port labeled (B) in Figure 1 is the primary drain for this
application and condensate drain line must be attached to this
drain port. Drain port (b) is for the secondary drain line (if used).
In applications where the air handler is installed in the horizontal
left position, and the return air environment see humidity levels
above 65% relative humidity coupled with total external static
levels above 0.5" e.s.p., installation may require a field fabricated
or field supplied secondary drain pan under the coil cabinet
enclosure.
Model
FTQ18/24/30/36/42/48
Execute heat insulation work completely on both sides of the
gas piping and the liquid piping or else a water leakage might
result.
Failing to insulate the pipes may cause leaking or burns. Be
sure to use the insulation which can withstand such temperatures
of 250°F (120°C) or more. Reinforce the insulation on the
refrigerant piping according to the installation environment. If
the temperature or humidity in the product installation location
might reach 86°F or 80%, respectively. Condensation may form
on the surface of the insulation.
IMPORTANT NOTE:
Ensure coil slides on the rails along the groove provided
on the drain pan side walls. Failure to do so will result in
improper condensation drainage
COIL INSTALLATION FOR DOWNFLOW
English
Tubing Size
Liquid Gas
3/8" 5/8"
Coil slides on
the downflow bracket
Figure 9
Follow the points at below.
• Use a tube cutter and flaring block suitable for the type or
refrigerant.
• To prevent dust, moisture or other foreign matter from
infiltrating the piping, 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. If any
refrigerant gas leaks while working on the unit immediately
ventilate the room.
1. Cut off the spin closure.
• The outdoor unit is charged with refrigerant.
• This coil contains gas under 150 P.S.I.G.
Release pressure from the gas piping pressure-release device
before initiating piping work.
Sharp object
(2) Push
Detail
Pressure
release device
Gas piping
Liquid piping
• Cut off the pipe end with a tube cutter. (Both liquid line and
gas line.)
Cap
After the work is finished,
try to repair.
(1) Remove
Front panel
Figure 10
9