Refrigerant - In Case Of R744 - Daikin CO2 Conveni-pack LRYEN10A7Y1 Installer And User Reference Manual

2 | General safety precautions
2.2.3 Refrigerant — in case of R744
Installer and user reference guide
10
See the installation manual or installer reference guide of your application for
more information.
NOTICE
Make sure refrigerant piping installation complies with applicable legislation. In
Europe, EN378 is the applicable standard.
NOTICE
Make sure the field piping and connections are NOT subjected to stress.
WARNING
During tests, NEVER pressurize the product with a pressure higher than the
maximum allowable pressure (as indicated on the nameplate of the unit).
WARNING
Take sufficient precautions in case of refrigerant leakage. If refrigerant gas leaks,
ventilate the area immediately. Possible risks:
▪
Carbon dioxide poisoning
▪
Asphyxiation
NOTICE
After all the piping has been connected, make sure there is no gas leak. Use nitrogen
to perform a gas leak detection.
NOTICE
▪
To avoid compressor breakdown, do NOT charge more than the specified amount
of refrigerant.
▪
When the refrigerant system is to be opened, refrigerant MUST be treated
according to the applicable legislation.
WARNING
Make sure there is no oxygen in the system. Refrigerant may only be charged after
performing the leak test and the vacuum drying.
Possible consequence: Self-combustion and explosion of the compressor because of
oxygen going into the operating compressor.
CAUTION
A vacuumed system will be under triple point. To avoid solid ice, ALWAYS start
charging with R744 in vapour state. When the triple point is reached (5.2 bar
absolute pressure or 4.2 bar gauge pressure), you may continue charging with R744
in liquid state.
▪ In case recharge is required, see the nameplate of the unit. It states the type of
refrigerant and necessary amount.
▪ The unit is factory charged with refrigerant and depending on pipe sizes and pipe
lengths some systems require additional charging of refrigerant.
▪ Only use R744 (CO ) as refrigerant. Other substances may cause explosions and
2
accidents.
LRYEN10A7Y1+LRNUN5A7Y1
CO₂ Conveni-Pack outdoor unit
4P605460-1 – 2020.08