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Specific installer safety instructions
Installer and user reference guide
16
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
WARNING
NEVER remove the spun piping by brazing.
Any gas or oil remaining inside the stop valve may blow off the spun piping.
WARNING
When stop valves are closed during service, the pressure of the closed circuit will
increase due to high ambient temperature. Make sure the pressure is kept below the
design pressure.
WARNING
ONLY connect the outdoor unit to showcases or blower coils with a design pressure:
▪
At the high pressure side (liquid side) of 90 bar gauge.
▪
At the low pressure side (gas side) of 60 bar gauge (is possible with safety valve at
field gas piping).
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
▪
Use K65 or equivalent piping for high-pressure applications with a working
pressure of 90 bar gauge.
▪
Use K65 or equivalent unions and fittings approved for a working pressure of
90 bar gauge.
▪
ONLY brazing is allowed to connect pipes. No other types of connections are
allowed.
▪
Expanding pipes is NOT allowed.
WARNING
Serious injury and/or damage can result from the blow-off of the liquid receiver
safety valve (see
"25.2 Piping diagram: Outdoor unit"
148]):
▪
NEVER service the unit when the pressure at the liquid receiver is higher than the
set pressure of the liquid receiver safety valve (90 bar gauge ±3%). If this safety
valve releases refrigerant, it can cause serious injury and/or damage.
▪
If the pressure > set pressure, ALWAYS discharge from pressure relief devices
before servicing.
▪
It is recommended to install and secure blow-off piping to the safety valve.
▪
ONLY alter the safety valve if the refrigerant has been removed.
