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Piping installation
Installer and user reference guide
95
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
6
It is recommended to apply 20 PTFE tape windings onto the thread of the
threaded piece.
7
It is recommended to screw the safety valve onto the threaded piece and
tighten it between 35 and 60 N•m. The safety valve has to be installed
vertically so water cannot enter the blow-off hole.
About changeover valves
In a configuration with 1 safety valve, it is necessary to evacuate the refrigerant if
the safety valve has to be replaced.
If you do not want to evacuate the refrigerant, we suggest you install a changeover
valve and use 2 safety valves.
System layout
d
a a
b
c
a
Safety valve (1 acc 1 field supplied)
b
Changeover valve (field supplied)
c
Threaded piece (accessory)
d
Outdoor unit
Safety valve reference information
Take the folllowing safety valve reference information into account.
Maximum piping length
The allowed length of the safety valve piping is limited by the following elements:
▪
the pipe's diameter
▪
the number of elbows in the piping
▪
the presence of a changeover valve and its kv value. For more information on
changeover valves, see
95].
Changeover
valve's kV
value
Maximum piping length (m) for Ø19.1 mm
(a)
8
elbows
9
elbows
10
elbows
11
elbows
12
elbows
0
(b)
21
20
20
19
18
3-3,49
14
13
12
12
11
3,5-4,49
15
15
14
14
13
4,5-4,99
17
17
16
16
15
5-7,99
18
17
17
16
16
(a)
K65 or equivalent piping
(b)
0 = There is no changeover valve present
