About The Refrigerant - Daikin LREN8A7Y1B Installer And User Manual

17.3 About the refrigerant

LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
CAUTION
Do NOT charge liquid refrigerant directly from a gas line. Liquid compression could
cause compressor operation failure.
NOTICE
If the power of some units is turned off, the charging procedure cannot be finished
properly.
NOTICE
Only when charging the unit for the first time, turn ON the power 6 hours before
operation in order to have power running to the crankcase heater and to protect the
compressor.
NOTICE
Before starting charging procedures, check if the 7‑LEDs display is as normal (see
"19.1.4 To access mode 1 or
"23.3 Solving problems based on error
NOTICE
Close the front panel before any refrigerant charge operation is executed. Without
the front panel attached the unit cannot judge correctly whether it is operating
properly or not.
NOTICE
Do NOT fully close the stop valve for field piping after the refrigerant has been
charged into the unit.
NOTICE
Do NOT fully close the liquid stop valve while the unit is stopping. The field liquid
piping might burst because of liquid seal. Furthermore, continuously keep a
connection between the safety valve and the field liquid piping to avoid bursting of
the piping (if pressure increases too much).
INFORMATION
Also read the precautions and requirements in the following chapters:
▪
General safety precautions
▪
Preparation
INFORMATION
For the operation method of the stop valves, refer to
service ports" [
This product contains refrigerant gases.
Refrigerant type: R744 (CO
4
2" [ 126]). If a malfunction code is present, see
codes" [
4
78].
)
2
17 Charging refrigerant
|
4
139].
"15.2 Using stop valves and
Installer and user reference guide
117