Installation
Installer reference guide
18
RZAG71~Y1
Sky Air Alpha-series
4P573381-1 – 2019.04
a
b
4
Do the following:
▪ Insulate the liquid piping (a) and the gas piping (b).
▪ Wind heat insulation around the curves, and then cover it
with vinyl tape (c).
▪ Make sure the field piping does not touch any compressor
components.
▪ Seal the insulation ends (sealant etc.) (d).
▪ Wrap the field piping with vinyl tape (e) to protect it against
sharp edges
b
a
c
d
f
e
5
If the outdoor unit is installed above the indoor unit, cover the
stop valves (f, see above) with sealing material to prevent
condensed water on the stop valves from moving to the indoor
unit.
NOTICE
Any exposed piping might cause condensation.
6
Reattach the service cover and the piping intake plate.
7
Seal all gaps (example: a) to prevent snow and small animals
from entering the system.
a
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
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.
