4 About the system
Installation and operation manual
10
LREN8~12A7 + LRNUN5A7
CO
₂
ZEAS outdoor unit and capacity up unit
4P704141-1B – 2022.12
4
About the system
WARNING
Do NOT modify, disassemble, remove, reinstall or repair
the unit yourself as incorrect dismantling or installation may
cause an electrical shock or fire. Contact your dealer.
NOTICE
Do NOT use the system for other purposes. In order to
avoid any quality deterioration, do NOT use the unit for
cooling precision instruments or works of art.
NOTICE
Do NOT use the system for cooling water. It may freeze.
NOTICE
For future modifications or expansions of your system:
A full overview of allowable combinations (for future
system extensions) is available in technical engineering
data and should be consulted. Contact your installer to
receive more information and professional advice.
NOTICE
Do NOT place objects that should NOT get wet below the
unit. Condensation on the unit or refrigerant pipes, or drain
blockage may cause dripping.
Possible consequence:
Objects under the unit can get dirty or damaged.
4.1
System layout
INFORMATION
The following figure is an example and may NOT
completely match your system layout
a
b
d
d
e
g
h
i
j
k
l
f
c
a
Main outdoor unit (LREN*)
b
Capacity up unit (LRNUN5*): only in combination with
LREN12*
c
Safety valve (accessory bag)
d
Indoor unit for refrigeration (showcase) (field supply)
e
Indoor unit for refrigeration (blower coil) (field supply)
f
Safety valve (field supply)
g
Communication box (BRR9B1V1)
h
CO
2
control panel (field supply)
i
CO
2
detector (field supply)
j
CO
2
alarm (field supply)
k
CO
2
ventilator (field supply)
l
Shut off valve (field supply)
5
Operation
5.1
Operation modes
The system allows for only one operation mode: refrigeration.
5.2
Operation range
Use the system in the following temperature ranges for safe and
effective operation.
Temperature type
Temperature range
Outdoor temperature
(a)
–20~43°C DB
Evaporation
temperature
Low temperature
–40~–20°C DB
Medium temperature
–20~5°C DB
(a)
For low load restrictions, see 'Constraints for refrigeration' in the
Installer and user reference guide.
5.3
Field piping pressure
Always keep the following field piping pressure in mind:
Piping
Field piping pressure
Gas
90 bar gauge
Liquid
90 bar gauge
6
Maintenance and service
WARNING
NEVER replace a fuse with a fuse of a wrong ampere
ratings or other wires when a fuse blows out. Use of wire
or copper wire may cause the unit to break down or cause
a fire.
CAUTION: Pay attention to the fan!
It is dangerous to inspect the unit while the fan is running.
Make sure to turn OFF the main switch before executing
any maintenance task.
CAUTION
Do NOT insert fingers, rods or other objects into the air
inlet or outlet. Do NOT remove the fan guard. When the
fan is rotating at high speed, it will cause injury.
CAUTION
After a long use, check the unit stand and fitting for
damage. If damaged, the unit may fall and result in injury.
NOTICE
NEVER inspect or service the unit by yourself. Ask a
qualified service person to perform this work.
NOTICE
Do NOT wipe the controller operation panel with benzine,
thinner, chemical dust cloth, etc. The panel may get
discoloured or the coating peeled off. If it is heavily dirty,
soak a cloth in water-diluted neutral detergent, squeeze it
well and wipe the panel clean. Wipe it with another dry
cloth.
6.1
About the refrigerant
This product contains refrigerant gases.
Refrigerant type: R744 (CO
2
)
