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8
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Piping installation
8.3.2 Precautions when checking the refrigerant piping
8.3.3 Checking refrigerant piping: Setup
Installer reference guide
104
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.
INFORMATION
Also read the precautions and requirements in the following chapters:
▪
"2 General safety
▪
"8.1 Preparing refrigerant
NOTICE
Use a 2-stage vacuum pump with a non-return valve that can evacuate to a gauge
pressure of − 1 00.7 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.
a
c
R32
N 2
b
d
a Pressure gauge
b Nitrogen
c Refrigerant
d Weighing scale
e Vacuum pump
f Stop valve
precautions" [
4
10]
4
piping" [
95]
f
e
ERRA08~12E + ELVH/X12S18+23E
Daikin Altherma 3 R MT F
4P708474-1 – 2023.05
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