Daikin VRV III REMQ72PBYD, Инженерные данные, Страница: 105 / 130

EDUS391004-N Installation
Installation of Outdoor Units 105
13. Valve B
14. Valve C
15. Outdoor unit
16. To Branch Selector (or indoor) unit
17. Shutoff valve
18. Service port
19. Field piping
20. Gas flow
NOTE
• The air-tightness test and vacuum drying
should be done using the service ports of
equalizer pipe, HP/LP gas pipe, suction gas
pipe and liquid pipe shutoff valve.
See the [R410A] Label attached to the front
plate of the outdoor unit for details on the
location of the service port (see figure 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, suction gas pipe, HP/LP 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.
<Vacuum drying>
Evacuate the system from the liquid pipe, suction gas pipe, HP/LP
gas pipe and equalizer pipe shutoff valve service ports by using a
vacuum pump for more than 2 hours and bring the system to
–14.6 psi or less. After keeping the system under that condition for
more than 1 hour, check if the vacuum gauge rises or not. If it rises,
the system may either contain moisture inside or have leaks.
NOTE
If moisture might enter the piping, follow belows.
(I.e., if doing work during the rainy season, if the actual work
takes long enough that condensation may form on the inside of
the pipes, if rain might enter the pipes during work, etc.)
After evacuating the system for 2 hours, pressurize the system to 7.25
psi (vacuum break) with nitrogen gas and evacuate the system again
using the vacuum pump for 1 hour to –14.6 psi or less (vacuum
drying). If the system cannot be evacuated to –14.6 psi within 2 hours,
repeat the operation of vacuum break and vacuum drying.
Then, after leaving the system in vacuum for 1 hour, confirm that the
vacuum gauge does not rise.
9. PIPE INSULATION
• Insulation of pipes should be done after performing “ 8. AIR TIGHT
TEST AND VACUUM DRYING ”.
• Always insulate the liquid piping, the HP/LP gas piping, the gas
piping, the equalizer pipe (between the outdoor units for the
outdoor multi system) and these pipe connections.
Failing to insulate the pipes may cause leaking or burns.
Especially, be sure to insulate the HP/LP gas piping as
withstanding as the suction pipe because the suction gas follows in
the HP/LP gas piping when the system is whole cooling mode.
And be sure to use the insulation which can withstand such
temperatures of 248°F or more for the HP/LP gas piping, the
equalizer pipe and the gas piping because the HP/LP gas follows
in these pipings.
• 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 outdoor 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.
10. 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 ”.
[R410A] Label
3P215731-11R