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Charging refrigerant
Installer and user reference guide
103
LRYELRNUN5A7Y1
CO₂ Conveni-Pack outdoor unit
4P605460-1 – 2020.08
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.
INFORMATION
For the operation method of the stop valves, refer to
71].
WARNING
▪
ONLY use R744 (CO
2
) as refrigerant. Other substances may cause explosions and
accidents.
▪
When installing, charging refrigerant, maintaining or performing service, ALWAYS
use personal protective equipment, such as safety shoes, safety gloves and safety
glasses.
▪
If the unit is installed indoors (for example, in a machine room), ALWAYS use a
portable CO
2
detector.
▪
If the front panel is open, ALWAYS beware of the rotating fan. The fan will
continue rotating for a while, even after the power switch has been turned off.
WARNING
The unit is already filled with a certain amount of R744. Do NOT open liquid and gas
stop valves until all checks from the
"21.3 Checklist before commissioning"
are completed.
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
Be sure to 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
"20.2.4 To access mode 1 or 2"
110]). If a malfunction code is present, see
"24.3 Solving problems based on error codes"
123].
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.
