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NOTICE
Make sure to use a recommended bubble test solution
from your wholesaler. Do not use soap water, which may
cause cracking of flare nuts (soap water may contain salt,
which absorbs moisture that will freeze when the piping
gets cold), and/or lead to corrosion of flared joints (soap
water may contain ammonia which causes a corrosive
effect between the brass flare nut and the copper flare).
1 Charge the system with nitrogen gas up to a gauge pressure of
at least 200 kPa (2 bar). It is recommended to pressurize to
3000 kPa (30 bar) in order to detect small leaks.
2 Check for leaks by applying the bubble test solution to all
connections.
3 Discharge all nitrogen gas.
6.5.5
To perform vacuum drying
NOTICE
▪ Connect the vacuum pump to both the service port of
the gas stop valve and the service port of the liquid
stop valve to increase efficiency.
▪ Make sure that the gas stop valve and liquid stop valve
are firmly closed before performing the leak test or
vacuum drying.
1 Vacuum the system until the pressure on the manifold indicates
−0.1 MPa (−1 bar).
2 Leave as is for 4-5 minutes and check the pressure:
If the pressure...
Does not change
Increases
3 Evacuate for at least 2 hours to a pressure on the manifold of
−0.1 MPa (−1 bar).
4 After turning OFF the pump, check the pressure for at least
1 hour.
5 If you do NOT reach the target vacuum or cannot maintain the
vacuum for 1 hour, do the following:
▪ Check for leaks again.
▪ Perform vacuum drying again.
NOTICE
Make sure to open the stop valves after installing the
refrigerant piping and performing vacuum drying. Running
the system with the stop valves closed may break the
compressor.
INFORMATION
After opening the stop valve, it is possible that the pressure
in the refrigerant piping does NOT increase. This might be
caused by e.g. the closed state of the expansion valve in
the outdoor unit circuit, but does NOT present any problem
for correct operation of the unit.
6.6
Charging refrigerant
6.6.1
About charging refrigerant
The outdoor unit is factory charged with refrigerant, but in some
cases the following might be necessary:
RZASG71~140M_V1+Y1
Sky Air Advance-series
4P486047-1 – 2017.04
Then...
There is no moisture in the
system. This procedure is
finished.
There is moisture in the
system. Go to the next step.
What
Charging additional refrigerant
Completely recharging refrigerant Example:
Charging additional refrigerant
Before charging additional refrigerant, make sure the outdoor unit's
external refrigerant piping is checked (leak test, vacuum drying).
INFORMATION
Depending on the units and/or the installation conditions, it
might be necessary to connect electrical wiring before you
can charge refrigerant.
Typical workflow – Charging additional refrigerant typically consists
of the following stages:
1 Determining if and how much you have to charge additionally.
2 If necessary, charging additional refrigerant.
3 Filling in the fluorinated greenhouse gases label, and fixing it to
the inside of the outdoor unit.
Completely recharging refrigerant
Before completely recharging refrigerant, make sure the following is
done:
1 All refrigerant is recovered from the system.
2 The outdoor unit's external refrigerant piping is checked (leak
test, vacuum drying).
3 Vacuum drying on the outdoor unit's internal refrigerant piping is
performed.
NOTICE
Before completely recharging, perform vacuum drying on
the outdoor unit's internal refrigerant piping as well.
NOTICE
To perform vacuum drying or a complete recharge of the
outdoor unit's internal refrigerant piping it is necessary to
activate the vacuum mode (see
deactivate the vacuum mode field setting" on page
which will open required valves in the refrigerant circuit so
the vacuuming process or recharge of refrigerant can be
done properly.
▪ Before vacuum drying or recharging, activate field
setting "vacuum mode".
▪ After finishing vacuum drying or recharging, deactivate
field setting "vacuum mode".
WARNING
Some sections of the refrigerant circuit may be isolated
from other sections caused by components with specific
functions (e.g. valves). The refrigerant circuit therefore
features additional service ports for vacuuming, pressure
relief or pressurizing the circuit.
In case it is required to perform brazing on the unit, ensure
that there is no pressure remaining inside the unit. Internal
pressures need to be released with ALL the service ports
indicated on the figures below opened. The location is
depending on model type.
Location of service ports:
6 Installation
When
When the total liquid piping
length is more than specified
(see later).
▪ When relocating the system.
▪ After a leak.
"6.6.9 To activate/
19)
Installer reference guide
17
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