13 Piping installation
Installation and operation manual
26
LREN8~12A7 + LRNUN5A7
CO
₂
ZEAS outdoor unit and capacity up unit
4P704141-1B – 2022.12
a
4×
b
a
Screw
b
Side plate
3
Dispose of the plate and its screws.
4
Remove the knockout in the bottom plate of the outdoor unit
and, if applicable, the one of the capacity up unit. For more
information, see
"14.3 Guidelines when knocking out knockout
2×
b
c
a
a
Knockout plate
b
Drill (Ø6 mm)
c
Drill here
5
Cut off the spun pipe ends. See
"13.3.1 To cut off the spun pipe
6
Connect the accessory gas and liquid pipes for bottom
connection to the outdoor unit.
b
a
A
B
A
Stop valve (gas)
B
Stop valve (liquid)
a
Gas pipe (accessory)
b
Liquid pipe (accessory)
7
Connect the accessory pipes to the field piping and if
applicable, to the capacity up unit.
13.3.3
Guidelines to connect T-joints
INFORMATION
Piping joints and fittings shall comply with the requirements
of EN 14276-2.
CAUTION
ALWAYS use K65 T-joints for refrigerant branching.
K65 T-joints are field supplied.
Liquid piping
Always branch horizontally when connecting the branch piping.
To prevent uneven refrigerant flow, always branch downwards when
using a header.
a
b
a
b
a
Coming from the outdoor units
b
Going to the indoor units
Gas piping
Always branch horizontally when connecting the branch piping.
To prevent refrigerant oil flowing into the indoor units, always set the
branch piping above the main piping.
c
a
b
c
a
a
b
d
a
Coming from the indoor units
b
Going to the outdoor units
c
Main refrigerant pipe
d
Slanting downwards
NOTICE
Where joints are used on piping, avoid damage caused by
freezing or vibration.
13.3.4
Guidelines to install a dryer
NOTICE
Do NOT operate the unit without a dryer installed on the
liquid pipe.
Possible consequence:
Without dryer,
operating the unit may cause a choked expansion valve,
hydrolysis of the refrigerant oil and copper plating of the
compressor.
Install a dryer on the liquid piping:
Dryer type
Drops of R744 water capacity at 60°C: 200
Recommended dryer for use with transcritical
CO
2
:
For LREN10* : CO-085-S (by Sporlan)
