7 | Installation
Installer reference guide
47
RZAG71~140N
Sky Air Alpha-series
4P695307-1A – 2024.02
7.5.2 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 −100.7kPa (−1.007bar)(5Torr 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.
7.5.3 Checking refrigerant piping: Setup
a
c
f
c
f
b d e h
g
i
a
b
A
B
d e
R32
R32
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
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