Daikin RXYQ96PATJ [49/108] Pipe insulation
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Daikin RXYQ96PATJ [49/108] Pipe insulation

Daikin RXYQ96PATJ [49/108] Pipe insulation
Installation EDUS391000-N_a
48 Installation of Outdoor Units
NOTE
• The air-tightness test and
vacuum drying should be
done using the service
ports of equalizer pipe,
gas pipe and liquid pipe
shutoff valve.
See the [R410A] Label
attached to the front plate
of the outside unit for
details on the location of
the service port (see fig-
ure at right)
• See [Shutoff valve operation procedure] in “11-1 Before
working” for details on handling the shutoff valve.
• The refrigerant charge port is connected to unit pipe.
When shipped, the unit contains the refrigerant, so use caution
when attaching the charge hose.
<Air tight test>
Pressurize the liquid pipe, gas pipe, and equalizer pipe from the
service ports of each shutoff valve to 550 psi (do not pressurize
more than 550 psi). If the pressure does not drop within 24 hours,
the system passes the test.
If there is a pressure drop, check for leaks, make repairs and
perform the airtight test again.
NOTE
<Vacuum drying> Do not energize the indoor unit before
performing the vacuum drying.
A triple evacuation is recommended; note that this is basic
refrigeration best practice and not specific to Daikin. The refrigerant
gauges should be connected to the liquid and suction gas pipes* and
a triple evacuation performed. Break the first and second vacuum with
dry nitrogen. The final evacuation should be to below
500 microns and
a rise test conducted; the system should hold below
500 microns for
at least one hour.
*On manifold systems, the equalizer lines must be evacuated
separately.
10. PIPE INSULATION
• Insulation of pipes should be done after performing “8. AIR TIGHT
TEST AND VACUUM DRYING”.
• Always insulate the liquid piping, the gas piping, the equalizer pipe
(between the outside units for the outdoor multi system) and these
pipe connections.
Failing to insulate the pipes may cause leaking or burns.
Be sure to use insulation that is designed for use with HVAC
systems.
• Reinforce the insulation on the refrigerant piping according to the
installation environment. Condensation might form on the surface
of the insulation. Refer to the below.
Ambient temperature : 86°F, humidity : 75% to 80% RH : min.
thickness : 9/16 in..
If the ambient temperature exceeds 86°F and the humidity 80%
RH, then the min. thickness is 3/4 in..
See the Engineering data book for detail.
• If there is a possibility that condensation on the shutoff valve might
drip down into the indoor unit through gaps in the insulation and
piping because the outside unit is located higher than the indoor
unit, etc., this must be prevented by caulking the connections, etc.
(Refer to figure 26)
• The piping lead-out hole lid should be attached after opening a
knock hole. (Refer to figure 27)
• If small animals and the like might enter the unit through the piping
lead-out hole, close the hole with blocking material (procured on
site) after completion of “11. ADDITIONAL REFRIGERANT
CHARGE AND CHECK OPERATION”. (Refer to figure 30)
(Refer to figure 26)
1. Insulation material
2. Caulking, etc.
(Refer to figure 27)
1. Piping lead-out hole lid
2. Open a knock hole at “ ”.
3. Block “ ”.
NOTE
• After knocking out the holes, we recommend you remove burrs in
the knock holes (See figure 27) and paint the edges and areas
around the edges using the repair paint.
11. CHECKING OF DEVICE AND
INSTALLATION CONDITIONS
Be sure to check the followings.
For those doing electrical work
1. Make sure there is no faulty transmission wiring or loosing of a nut.
See “7-4 Transmission Wiring Connection Procedure”.
2.
Make sure there is no faulty power wiring or loosing of a nut.
See “7-5 Power Wiring Connection Procedure”.
3. Has the insulation of the main power circuit deteriorated?
Measure the insulation and check the insulation is above regular
value in accordance with relevant local and national regulations.
For those doing pipe work
1. Make sure piping size is correct.
See “
6-1 Selection of piping material and Refrigerant branching
kit
”
.
2. Make sure insulation work is done.
See “9. PIPE INSULATION”.
3. Make sure there is no faulty refrigerant piping.
See “6. REFRIGERANT PIPING”.
12. ADDITIONAL REFRIGERANT CHARGE
AND CHECK OPERATION
The outside unit is charged with refrigerant when shipped from the
factory, but depending on the size and length of the piping when
installed, it may require additional charging.
For charging the additional refrigerant, follow the procedure in this
chapter.
And then carry out the check operation.
[R410A] Label

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