Daikin EKVDX-A Installer And User Manual page 21

EKVDX32~100A2VEB
VRV system air conditioner
4P664010-1 – 2021.08
WARNING
For VAM+EKVDX, only consider rooms that are continuously served. E.g. In case of
zonal dampers in the duct between EKVDX and a room, this room cannot be
considered as part of the total room area. Only exception are zonal dampers only
used for fire safety.
Use A , A and A in the following steps to determine the maximum allowable total
1 2 3
charge of the system.
Step 2 – see the installation manual of the outdoor unit for choosing the correct
curve depending on the installation height of the indoor unit. For EKVDX units,
installation height should always be ≥2.2 m.
Step 3 – in case there are underground floors, determine the maximum allowable
charge limit in the system for each area (A
▪ For the room with the smallest area containing an indoor unit not on the lowest
underground floor/on the lowest underground floor: see the outdoor unit
installation manual on R32 charge limitations.
▪ For the total room area for the VAM+EKVDX system when it contains:
- no room in the lowest underground floor, refer to curve (a).
- at least one room in the lowest underground floor, refer to curve (b).
Once the maximum allowable charge has been calculated for all applicable
scenarios, use the lowest value as the upper limit.
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
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
Factory charge
Maximum field piping charge
3 Specific installer safety instructions
|
, A and A ):
1 2 3
" 3‒1 Example" [
4
22]). Result:
10.4 kg
3.4 kg
7.0 kg
Installer and user reference guide
21