Daikin REYA28A7Y1B handleiding
Handleiding
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15 Piping installation
Installation and operation manual
30
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P684060-1C – 2024.10
NOTICE
Make sure that all indoor units and BS units connected to
the outdoor unit are powered on.
NOTICE
Wait to apply setting [2‑21] until the outdoor unit has
finished the initialisation.
Leak test and vacuum drying
Checking the refrigerant piping involves:
▪ Checking for any leakages in the refrigerant piping.
▪ Performing vacuum drying to remove all moisture, air or nitrogen
in the refrigerant piping.
If there is a possibility of moisture being present in the refrigerant
piping (for example, water may have entered the piping), first carry
out the vacuum drying procedure below until all moisture has been
removed.
All piping inside the unit has been factory tested for leaks.
Only field installed refrigerant piping needs to be checked.
Therefore, make sure that all the outdoor unit stop valves are firmly
closed before performing leak test or vacuum drying.
NOTICE
Make sure that all (field supplied) field piping valves are
OPEN (not outdoor unit stop valves!) before you start leak
test and vacuuming.
For more information on the state of the valves, refer to
"15.3.3Checking refrigerant piping: Setup"[430].
15.3.2 Checking refrigerant piping: General
guidelines
Connect the vacuum pump through a manifold to the service port of
all stop valves to increase efficiency (refer to "15.3.3 Checking
refrigerant piping: Setup"[430]).
NOTICE
Use a 2-stage vacuum pump with a non-return valve or a
solenoid valve that can evacuate to a gauge pressure of
–100.7kPa (−1.007bar).
NOTICE
Make sure the pump oil does not flow oppositely into the
system while the pump is not working.
NOTICE
Do NOT purge the air with refrigerants. Use a vacuum
pump to evacuate the installation.
15.3.3 Checking refrigerant piping: Setup
p
<
p
>
R32
N
2
C D
b c e
a
g
h
f
d
A B
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
h High pressure/low pressure gas line stop valve
A Valve A
B Valve B
C Valve C
D Valve D
Valve Status
Valve A Open
Valve B Open
Valve C Open
Valve D Open
Liquid line stop valve Close
Gas line stop valve Close
High pressure/low pressure gas line stop valve Close
NOTICE
The connections to the indoor units and all indoor units
should also be leak and vacuum tested. Keep any possible
(field supplied) field piping valves open as well.
Refer to the indoor unit installation manual for more details.
Leak test and vacuum drying should be done before the
power supply is set to the unit. If not, see also the flow
chart earlier described in this chapter (see "15.3.1 About
checking the refrigerant piping"[429]).
15.3.4 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).
15.3.5 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.
Bekijk gratis de handleiding van Daikin REYA28A7Y1B, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Daikin |
| Model | REYA28A7Y1B |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 10147 MB |
