3 User safety instructions
Installation and operation manual
8
EKVDX32~100A2VEB
VRV system air conditioner
4P555815-1A – 2021.08
Step 4
– determine the total amount of allowable refrigerant charge
in the system based on the above curves.
Step 5
– the total refrigerant charge in the system must be less than
the maximum allowable total refrigerant charge value derived from
step 4. If not:
1
Change the installation. Do one of the following:
▪ Increase the area of smallest room.
▪ Decrease the piping length by changing the system layout (if
practical).
▪ Increase the total floor area of the VAM+EKVDX system.
▪ Add additional countermeasures as described in the applicable
legislation.
2
Repeat all of the above steps.
Example
VRV system with an EKVDX and ceiling mounted indoor units
serving 4 rooms. The total room area of all 4 rooms is 80 m², the
smallest room with an indoor unit has an area of 16 m². No
underground floor in the building.
▪ To check the maximum allowable charge for the total room area of
80 m² with an EKVDX unit in the system, use curve (a) (see
8]).
Result:
27 kg.
▪ To check the maximum allowable charge, for a room of 16 m² with
a ceiling mounted unit, see the outdoor unit manual section on
charge limitations.
Result:
10.4 kg.
Charge in system
10.4 kg
Factory charge
3.4 kg
Maximum field piping charge
7.0 kg
0
2
4
6
8
10
18
22
12
16
27
14.4
24
28
30
31
10 20
40
60
80
85
100
50
30
70
90
m (kg)
A
tot
(m
2
)
(a)
(b)
2‒1 Example
Case 2: VAM+ EKVDX only
Step 1
– determine A
4
: the total area of all the rooms which the
EKVDX unit is discharging air into. See
Step 2
– (see step 2 of case 1)
Step 3
– in case the EKVDX:
▪ is not discharging into any room in the lowest underground floor,
refer to curve (a).
▪ can discharge to a combination of rooms in the lowest
underground floor and other floors, refer to curve (b).
Step 4
– (see step 4 of case 1)
Step 5
– (see step 5 of case 1)
Example
VRV system with an EKVDX serving 5 rooms. The total room area is
85 m², the smallest room with a ceiling mounted indoor unit on other
floors has an area of 14 m². There are multiple underground floors in
the building and the smallest room with an indoor unit in the lowest
underground floor has an area of 24 m².
▪ To check the maximum allowable charge for a total room area of
85 m² with an EKVDX unit in the system, use curve (b) (see
Result:
14.4 kg.
▪ To check the maximum allowable charge, see the outdoor unit
manual for the following calculations:
▪ for a room of 14 m² with a ceiling mounted unit not in the lowest
underground floor.
Result:
9.3 kg.
▪ for the smallest room of 24m² of the lowest underground floor
with a wall mounted indoor unit.
Result:
8.1 kg.
8.1<9.3<14.4 kg, therefore the maximum allowable refrigerant
charge is 8.1 kg (smallest value).
Charge in system
8.1 kg
Factory charge
3.4 kg
Maximum field piping charge
4.7 kg
2.1.3
To determine the floor area
Follow these rules to determine the room area:
▪ Determine the room area by projecting the walls, doors and
partitions to the floor and calculating the enclosed area.
▪ Do not consider spaces connected by only false ceilings, ductwork
or similar connections as a single space.
▪ If the partition between 2 rooms on the same floor meets certain
requirements, the rooms are considered as one room and the
areas of the rooms may be added up. This way it is possible to
increase the room area value used to calculate the maximum
allowed charge.
When considering the smallest single room (for other indoor units
only, NOT for EKVDX), one of the following 2 requirements MUST
be followed:
▪ Rooms on the same floor that are connected with a permanent
opening that extends to the floor and is intended for people to
walk through can be considered as one room.
▪ Rooms on the same floor connected with openings that fulfil
certain requirements (see the installation and operation manual of
the outdoor unit) can be considered as a single room. The
opening must consist out of at least 2 parts to allow for air
circulation.
For the user
3
User safety instructions
Always observe the following safety instructions and regulations.
3.1
General
WARNING
If you are NOT sure how to operate the
unit, contact your installer.
