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18
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Piping installation
Installer and user reference guide
83
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10
▪
Use heat resistant polyethylene foam which can withstand a temperature of 70°C
for liquid piping and polyethylene foam which can withstand a temperature of
120°C for gas piping.
▪
Reinforce the insulation on the refrigerant piping according to the installation
environment.
▪
If there is a possibility that condensation on the stop valve might drip down into
the indoor unit through gaps in the insulation and piping because the outdoor
unit is located higher than the indoor unit, this must be prevented by sealing up
the connections. See below figure.
a
b
a
Insulation material
b
Caulking etc.
18.4 Charging refrigerant
18.4.1 About charging refrigerant
The outdoor unit is factory charged with refrigerant, but depending on the field
piping you have to charge additional refrigerant.
Before charging refrigerant
Make sure the outdoor unit's
external
refrigerant piping is checked (leak test,
vacuum drying).
Typical workflow
Charging additional refrigerant typically consists of the following stages:
1
Determining how much you have to charge additionally.
2
Charging additional refrigerant (pre-charging and/or charging).
3
Filling in the fluorinated greenhouse gases label, and fixing it to the inside of
the outdoor unit.
18.4.2 Precautions when charging refrigerant
INFORMATION
Also read the precautions and requirements in the following chapters:
▪
General safety precautions
▪
Preparation
WARNING
▪
ONLY use R410A as refrigerant. Other substances may cause explosions and
accidents.
▪
R410A contains fluorinated greenhouse gases. Its global warming potential (GWP)
value is 2087.5. Do NOT vent these gases into the atmosphere.
▪
When charging refrigerant, ALWAYS use protective gloves and safety glasses.