12 Unit installation
Installation and operation manual
14
LRYELRNUN5A7Y1
CO
₂
Conveni-Pack outdoor unit and capacity up unit
4P605461-1B – 2020.08
INFORMATION
For more information regarding allowable refrigerant
charge and space volume calculations see the reference
guide of the indoor unit.
Appropriate measures
INFORMATION
Appropriate measures are field supply. Choose and install
all required appropriate measures in accordance with
EN 378-3:2016.
▪ (natural or mechanical) ventilation
▪ safety shut-off valves
▪ safety alarm, in combination with a CO
2
refrigerant leak detector (a
safety alarm alone is NOT considered an appropriate measure
where occupants are restricted in their movements)
▪ CO
2
refrigerant leak detector
WARNING
Install the unit only in locations where the doors of the
occupied space are not tight fitting.
WARNING
When using safety shut-off valves, make sure to install
measures such as a bypassing piping with a pressure relief
valve (from liquid pipe to gas pipe). When the safety shut-
off valves close and no measures are installed, increased
pressure may damage the liquid piping.
To determine the minimum number of appropriate
measures
For occupancies other than on the lowest underground floor of
the building
If the total refrigerant charge
(kg) divided by the room
volume
(a)
(m
3
) is…
…the number of appropriate
measures must be at least…
<QLMV
0
>QLMV and <QLAV
1
>QLAV
2
(a)
For occupied spaces with a floor area exceeding 250 m
2
, use
250 m
2
as the floor area for determination of the room volume
(
Example:
even if the room area is 300 m
2
and the room height
is 2.5 m, calculate the room volume as 250 m
2
×2.5 m=625 m
3
)
Example:
Total refrigerant charge in the system is 45 kg and room
volume is 300 m
3
. 45/300=0.15, which is >QLMV (0.074) and
<QLAV (0.18), therefore install at least 1 appropriate measure in the
room.
A (kg)
B (m³)
0
0
100 150
50
200 250
300
350
450
550
400
500
600 650 700 750 800 850 900 950 1000
5
10
15
20
25
30
35
40
45
50
55
60
65
70
c
b
a
QLMV
QLAV
12‒1 Example graph for calculation
A
Refrigerant charge
B
Room volume
a
2 appropriate measures required
b
1 appropriate measure required
c
No measure required
For occupancies on the lowest underground floor of the
building
If the total refrigerant charge
(kg) divided by the room
volume
(a)
(m
3
) is…
…the number of appropriate
measures must be at least…
<RCL
0
>RCL and ≤QLMV
1
>QLMV and <QLAV
2
>QLAV
Value CANNOT be exceeded!
(a)
For occupied spaces with a floor area exceeding 250 m
2
, use
250 m
2
as the floor area for determination of the room volume
(
Example:
even if the room area is 300 m
2
and the room height
is 2.5 m, calculate the room volume as 250 m
2
×2.5 m=625 m
3
)
Example:
Total refrigerant change in the system is 45 kg and room
volume is 300 m
3
. 45/300=0.15, which is >RCL (0.072) and <QLAV
(0.18), therefore install at least 2 appropriate measures in the room.
A (kg)
B (m³)
0
0
100 150
50
200 250
300
350
450
550
400
500
600 650 700 750 800 850 900 950 1000
5
10
15
20
25
30
35
40
45
50
55
60
65
70
d
b
a
RCL
QLAV
QLMV
c
12‒2 Example graph for calculation
A
Refrigerant charge limit
B
Room volume
a
Installation is not allowed
b
2 appropriate measures required
c
1 appropriate measure required
d
No measure required
INFORMATION
Even if there is no refrigerating system on the lowest floor,
where the largest system charge (kg) in the building
divided by total volume of the lowest floor (m
3
) exceed the
value for QLMV, provide a mechanical ventilation in
accordance with EN 378-3:2016.
12.2
Opening and closing the unit
12.2.1
To open the outdoor unit
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING/SCALDING
To gain access to the unit, front plates need to be opened as follows:
1
Remove the screws of the small front plates.
