Daikin FXFN50A2VEB, Installation And Operation Manual, Page: 14 / 28

12 Unit installation
Installation and operation manual
14
FXFN50~112A2VEB
CO ₂ Conveni-Pack: indoor unit
3P672850-1A – 2021.07
▪ A: Minimum distance to the wall . Depends on the air flow
directions towards the wall.
≥1500 ≥500 ≥200
a
A A A
b c
a Air outlet and corners open
b Air outlet closed, corners open (optional blocking pad kit
required)
c Air outlet and corners closed (optional blocking pad kit
required)
▪ B: Minimum and maximum distance to the floor :
▪ Minimum: 2.7 m to avoid accidental touching.
▪ Maximum: Depends on the airflow directions and the capacity
class. See "16.1 Field setting" [
4
22].
INFORMATION
Maximum distance to the floor for the 3-way and the 4-way
airflow (which require an optional blocking pad kit) may
differ. See the installation manual of the optional blocking
pad kit.
INFORMATION
Some options may require additional service space. Refer
to the installation manual of the used option before
installation.
12.1.2 Additional installation site requirements
for CO
₂ refrigerant
WARNING
In case of mechanical ventilation, take care the ventilated
air is exhausted to the outdoor space and NOT into
another closed area.
Refrigerant basic characteristics
Refrigerant R744
RCL (refrigerant concentration limit) 0.072 kg/m
3
QLMV (quantity limit with minimum ventilation) 0.074 kg/m
3
QLAV (quantity limit with additional ventilation) 0.18 kg/m
3
Toxicity limit 0.1 kg/m
3
Safety class A1
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.
Example: Install the bypass piping ( e ) with a pressure relief valve
( g ) leading from the liquid piping between indoor unit and the shut off
valve ( c2 ) to the gas piping between outdoor unit and the shut off
valve ( d1 ).
a
b
f
f
h
g
b c1
c1
c2 c2
d1 d1
d2 d2
ee
ee
Ø12.7 mm Ø9.52 mm
12‒1 Installation layout example
a Outdoor unit
b Stop valve on the outdoor unit
c1 Liquid piping between outdoor unit and the shut off valve
c2 Liquid piping between indoor unit and the shut off valve
d1 Gas piping between outdoor unit and the shut off valve
d2 Gas piping between indoor unit and the shut off valve
e Bypassing piping
f Safety shut off valve
g Pressure relief valve
h Indoor unit
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.