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Piping installation
Installer reference guide
72
ERLA EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596821-1B – 2021.10
8.3.2 Precautions when checking the refrigerant piping
INFORMATION
Also read the precautions and requirements in the following chapters:
▪
"2 General safety precautions"
▪
"8.1 Preparing refrigerant piping"
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 the service port of the gas stop valve.
▪
Make sure that the gas stop valve and liquid stop valve are firmly closed before
performing the leak test or vacuum drying.
8.3.3 Checking refrigerant piping: Setup
R32
N
2
a
c
f
b
d
e
a
Pressure gauge
b
Nitrogen
c
Refrigerant
d
Weighing scale
e
Vacuum pump
f
Stop valve
8.3.4 To check for leaks
NOTICE
Do NOT exceed the unit's maximum working pressure (see "PS High" on the unit
name plate).
