Checking The Refrigerant Piping; Checking Refrigerant Piping: Setup; To Perform A Leak Test; To Perform Vacuum Drying - Daikin Sky Air Advance Series Installation Manual

6 Electrical installation

5.2

Checking the refrigerant piping

5.2.1

Checking refrigerant piping: Setup

a
A
c
R32
b d e
a
B
c
R32
b d e
A Setup in case of pair
B Setup in case of twin
a Pressure gauge
b Nitrogen
c Refrigerant
d Weighing scale
e Vacuum pump
f Stop valve
g Main piping
h Refrigerant branch kit
i Branch piping
5.2.2

To perform a leak test

The leak test must satisfy the specifications of EN378‑2.
Pressure leak test
NOTICE
Do NOT exceed the unit's maximum working pressure (see
"PS High" on the unit name plate).
1 Charge the system with nitrogen gas up to a gauge pressure of
at least 0.2 MPa (2 bar). It is recommended to pressurize to
3.0 MPa (30 bar) in order to detect small leaks.
2 Check for leaks by applying the bubble test solution to all
connections.
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).
3 Discharge all nitrogen gas.
Installation manual
10
f
f
i
g
h
5.2.3

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 Vacuum the system for at least 2 hours to a manifold pressure
of −0.1 MPa (−1 bar).
4 After turning the pump OFF, 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.
6 Electrical installation
DANGER: RISK OF ELECTROCUTION
WARNING
The appliance MUST be installed in accordance with
national wiring regulations.
WARNING
ALWAYS use multicore cable for power supply cables.
WARNING
If the supply cord is damaged, it MUST be replaced by the
manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard.
CAUTION
Do NOT push or place redundant cable length into the unit.
CAUTION
For use of units in applications with temperature alarm
settings it is recommended to foresee a delay of 10
minutes for signalling the alarm in case the alarm
temperature is exceeded. The unit may stop for several
minutes during normal operation for "defrosting the unit", or
when in "thermostat stop" operation.
Then...
There is no moisture in the
system. This procedure is
finished.
There is moisture in the
system. Go to the next step.
RZASG100~140MUV/Y
Sky Air Advance-series
4P734658-1 – 2023.08