Daikin RXYQ6BRY16 Installation Manual page 31

10.4.1 General guidelines
Use a 2-stage vacuum pump with a non-return valve
•
which can evacuate to a gauge pressure of
–100.7 kPa (5 Torr absolute, –755 mm Hg).
Connect the vacuum pump to the service port of all
•
3 stop valves to increase efficiency
(see "10.4.4 Setup").
NOTICE
Do not purge the air with refrigerants.
Use a vacuum pump to evacuate the installation.
10.4.2 Installation of refrigerant piping, leak test,
vacuuming before electrical installation is
done (regular installation method)
When all piping work is complete, it is necessary to:
Check for any leakages in the refrigerant piping by
•
use nitrogen gas.
Perform 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, rainwater may have
entered the piping), 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.
10.4.3 Installation of refrigerant piping, leak test,
vacuuming after electrical installation is
done on any indoor or outdoor unit
Apply outdoor unit setting [2-21]=1 before starting leak
test and vacuuming.
This setting will open field expansion valves to
guarantee a R410A piping pathway.
NOTICE
Make sure that all (field supplied) field piping
•
valves are OPEN (not outdoor unit stop valves!)
before you start leak test and vacuuming.
Make sure that all indoor units connected to
•
the outdoor unit are powered on.
Wait until the outdoor unit has finished the
•
initialisation to apply setting [2-21].
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When all piping work is complete, it is necessary to:
Check for any leakages in the refrigerant piping by
•
use nitrogen gas.
Perform 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, rainwater 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 stop valves
are firmly closed before performing leak test or vacuum
drying.
10.4.4 Setup
6
8
1
7
A
4
B
2 3 5
C
1 Gauge manifold
2 Dry Nitrogen
3 Measuring instrument
4 Refrigerant R410A tank (siphon system)
5 Vacuum pump
6 Charge hose
7 Gas pipe stop valve
8 Liquid pipe stop valve
9 Refrigerant auto charge valve (needle valve)
10 Valve
11 Field piping
12 Gas flow
13 Stop valve service port
A Valve A
B Valve B
C Valve C
Which valves?
Valve A Open
Valve B Open
Valve C Close (before connect needle valve)
Liquid pipe stop valve Close
Gas pipe stop valve Close
CAUTION
In order to prevent refrigerant from leaking past
valve C, close valve C before connecting to the
needle valve and keep it closed while conducting
a leak test and vaccum drying.
It might cause frostbite if touched directly by
refrigerant that has leaked.
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13
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State of valve
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