6 Installation
Installer reference guide
16
AZAS71~Y1
Sky Air Active-series
4P486048-1A – 2017.08
NOTICE
Do not block the air vents. This could affect air circulation
inside the unit.
WARNING
Provide adequate measures to prevent that the unit can be
used as a shelter by small animals. Small animals that
make contact with electrical parts can cause malfunctions,
smoke or fire.
NOTICE
Precautions when making knockout holes:
▪ Avoid damaging the casing.
▪ After making the knockout holes, we recommend you
remove the burrs and paint the edges and areas
around the edges using repair paint to prevent rusting.
▪ When passing electrical wiring through the knockout
holes, wrap the wiring with protective tape to prevent
damage.
b
c
a
a
Knockout hole
b
Burr
c
Sealant etc.
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.
6.5
Checking the refrigerant piping
6.5.1
About checking the refrigerant piping
The outdoor unit's
internal
refrigerant piping has been factory tested
for leaks. You only have to check the outdoor unit's
external
refrigerant piping.
Before checking the refrigerant piping
Make sure the refrigerant piping is connected between the outdoor
unit and the indoor unit.
Typical workflow
Checking the refrigerant piping typically consists of the following
stages:
1
Checking for leaks in the refrigerant piping.
2
Performing vacuum drying to remove all moisture, air or
nitrogen from 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.
6.5.2
Precautions when checking the
refrigerant piping
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
NOTICE
Use a 2-stage vacuum pump with a non-return valve that
can evacuate to a gauge pressure of −100.7 kPa
(−1.007 bar)(5 Torr absolute). Make sure the pump oil
does not flow oppositely into the system while the pump is
not working.
NOTICE
Use this vacuum pump for R32 exclusively. Using the
same pump for other refrigerants may damage the pump
and the unit.
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.
6.5.3
Checking refrigerant piping: Setup
R32
a
c
f
b
d
e
a
Pressure gauge
b
Nitrogen
c
Refrigerant
d
Weighing machine
e
Vacuum pump
f
Stop valve
6.5.4
To check for leaks
NOTICE
Do NOT exceed the unit's maximum working pressure (see
"PS High" on the unit name plate).
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.
