17 Commissioning
Installation and operation manual
41
LREN8~12A7 + LRNUN5A7
CO
₂
ZEAS outdoor unit and capacity up unit
4P704141-1B – 2022.12
Field wiring
Check that that the field wiring has been carried out
according to the instructions described in the chapter
30], according to the wiring
diagrams and according to the applicable national wiring
regulations.
Power supply voltage
Check the power supply voltage on the local supply panel.
The voltage MUST correspond to the voltage on the
nameplate of the unit.
Earth wiring
Be sure that the earth wires have been connected
properly and that the earth terminals are tightened.
Insulation test of the main power circuit
Using a megatester for 500 V, check that the insulation
resistance of 2 MΩ or more is attained by applying a
voltage of 500 V DC between power terminals and earth.
NEVER use the megatester for the transmission wiring.
Fuses, circuit breakers, or protection devices
Check that the fuses, circuit breakers, or the locally
installed protection devices are of the size and type
specified in the chapter
30].
Be sure that no fuse or protection device is bypassed.
Internal wiring
Visually check the electrical component box and the
inside of the unit for loose connections or damaged
electrical components.
Safety valve (field supply)
Check that the safety valve (field supply) has been
installed correctly according to standards EN378-2 and
EN13136.
Safety valve (accessory)
Check that the safety valve (accessory) has been installed
correctly according to standards EN378-2 and EN13136.
Pipe size and pipe insulation
Be sure that correct pipe sizes are installed and that the
insulation work is properly executed.
Stop valves
Be sure that the stop valves (2 in total) are open on the
liquid and gas side between the outdoor unit and indoor
unit.
Damaged equipment
Check the inside of the unit for damaged components or
squeezed pipes.
Refrigerant leak
Check the inside of the unit on refrigerant leakage. If there
is a refrigerant leak, try to repair the leak. If the repair is
unsuccessful, call your local dealer. Do not touch any
refrigerant which has leaked out from refrigerant piping
connections. This may result in frostbite.
Oil leak
Check the compressor for oil leakage. If there is an oil
leak, try to repair the leak. If the repairing is unsuccessful,
call your local dealer.
Air inlet/outlet
Check that the air inlet and outlet of the unit is NOT
obstructed by paper sheets, cardboard, or any other
material.
Refrigerant charge
The amount of refrigerant to be added to the unit shall be
written in the logbook.
Add the total amount of refrigerant to the refrigerant
charge label.
Installation of indoor units
Check that the units are properly installed.
Installation of capacity up unit
Check that the unit is properly installed, if applicable.
Installation date and field setting
Be sure to keep record of the installation date in the
logbook.
17.3
About the test run
Make sure to carry out the system test operation after the first
installation.
The procedure below describes the test operation of the complete
system.
NOTICE
If a capacity up unit is installed, conduct its test run AFTER
the test run of the outdoor unit.
17.4
To perform a test run (7-segment
display)
To perform a test run of the outdoor unit
Applicable for LREN*
1
Check that all the stop valves between the outdoor unit and
indoor unit are fully open: gas and liquid stop valves.
2
Check that all electrical components and refrigerant piping is
installed correctly, for the indoor units, outdoor unit, and (if
applicable) capacity up unit.
3
Turn ON the power supply of all units: the indoor units, outdoor
unit and (if applicable) the capacity up unit.
4
Wait for about 10 minutes until the communication between the
outdoor unit and indoor units is confirmed. The 7-segment
display is blinking during the communication test:
▪ If communication is confirmed, the display will be OFF.
▪ If communication is not confirmed, an error code will be
displayed on the remote controller of the indoor units. See
"18.1.1 Error codes: Overview"
5
Turn ON the operation switch of the outdoor unit. The
compressors and fan motors start to operate.
6
Check that the unit functions without error codes. See
7
Check that the showcases and blower coils cool correctly.
To perform a test run of the capacity up unit
Applicable for LRNUN5*.
Prerequisite:
The refrigeration circuit of the outdoor unit is operating
in a stable condition.
1
Turn ON the operation switch of the capacity up unit.
2
Wait for about 10 minutes (after power supply ON) until the
communication between the outdoor unit and the capacity up
unit is confirmed. The 7-segment display on the PCB of the
capacity up unit is blinking during the communication test:
