Daikin RXYSA8AMY1B handleiding
Handleiding
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15 Piping installation
Installation and operation manual
34
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752781-1C – 2024.10
15.2.5 To connect the refrigerant branching kit
For installation of the refrigerant branching kit, refer to the installation
manual delivered with the kit.
▪ Mount the refnet joint so that it branches either horizontally or
vertically.
▪ Mount the refnet header so that it branches horizontally.
A
B
±
3
0
°
a
b
c
d
a
a Horizontal surface
b Refnet joint mounted vertically
c Refnet joint mounted horizontally
d Header
15.3 Checking the refrigerant piping
15.3.1 Checking refrigerant piping: Setup
p
<
p
>
C
b c e
a
g
f
d
A B
R32
N
2
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R32 tank (siphon system)
e Vacuum pump
f Liquid line stop valve
g Gas line stop valve
A Valve A
B Valve B
C Valve C
Valve Status
Valve A Open
Valve B Open
Valve C Open
Liquid line stop valve Close
Gas line stop valve Close
NOTICE
Indoor units should also be leak and vacuum tested. Keep
any possible (field supplied) field piping valves open as
well.
15.3.2 To perform a leak test
The leak test must satisfy the specifications of EN378‑2.
Vacuum leak test
1 Evacuate the system from the liquid and gas piping to a gauge
pressure of –100.7kPa (–1.007bar) for more than 2 hours.
2 Once reached, turn off the vacuum pump and check that the
pressure does not rise for at least 1 minute.
3 Should the pressure rise, the system may either contain
moisture (see vacuum drying below) or have leaks.
Pressure leak test
1 Break the vacuum by pressurising with nitrogen gas to a
minimum gauge pressure of 0.2 MPa (2 bar). Never set the
gauge pressure higher than the maximum operation pressure of
the unit, i.e. 4.0MPa (40bar).
2 Test for leaks by applying a bubble test solution to all piping
connections.
3 Discharge all nitrogen gas.
NOTICE
ALWAYS use a recommended bubble test solution from
your wholesaler.
NEVER use soap water:
▪ Soap water may cause cracking of components, such
as flare nuts or stop valve caps.
▪ Soap water may contain salt, which absorbs moisture
that will freeze when the piping gets cold.
▪ Soap water contains ammonia which may lead to
corrosion of flared joints (between the brass flare nut
and the copper flare).
15.3.3 To perform vacuum drying
To remove all moisture from the system, proceed as follows:
1 Evacuate the system for at least 2 hours to a target vacuum of
–100.7kPa (–1.007bar)(5Torr absolute).
2 Check that, with the vacuum pump turned off, the target
vacuum is maintained for at least 1hour.
3 Should you fail to reach the target vacuum within 2 hours or
maintain the vacuum for 1 hour, the system may contain too
much moisture. In that case, break the vacuum by pressurising
with nitrogen gas to a gauge pressure of 0.05 MPa (0.5 bar)
and repeat steps 1 to 3 until all moisture has been removed.
4 Depending on whether you want to immediately charge
refrigerant through the refrigerant charge port or first pre-charge
a portion of refrigerant through the liquid line, either open the
outdoor unit stop valves, or keep them closed. See "16.3 To
charge refrigerant"[436] for more information.
15.3.4 To insulate the refrigerant piping
After finishing the leak test and vacuum drying, the piping must be
insulated. Take into account the following points:
▪ Make sure to insulate the connection piping and refrigerant branch
kits entirely.
▪ Be sure to insulate the liquid and gas piping (for all units).
▪ Use heat resistant polyethylene foam which can withstand a
temperature of 70°C for liquid piping and polyethylene foam which
can withstand a temperature of 120°C for gas piping.
▪ Reinforce the insulation on the refrigerant piping according to the
installation environment.
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Productinformatie
| Merk | Daikin |
| Model | RXYSA8AMY1B |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 9612 MB |
