15 Configuration
Installation and operation manual
21
EKVDX32~100A2VEB
VRV system air conditioner
4P555815-1A – 2021.08
System example
P
1
P
2
P
1
P
2
F
1
F
2
T
1
T
2
N L
c
TO OUT/D
TO IN/D
a
L N
P
2
P
1
L N
P
2
P
1
L
N
b
d
P
1
P
2
P
1
P
2
F
1
F
2
T
1
T
2
N L
c
L
N
b
d
P
1
P
2
P
1
P
2
F
1
F
2
T
1
T
2
N L
c
L
N
e
a
Outdoor unit
b
Heat reclaim ventilation unit (VAM)
c
User interface
d
EKVDX indoor unit
e
Normal VRV indoor unit
14.3
To connect the external outputs
The applied current of the external device MUST be less or equal
than 1 A. Install a fuse ≤1 A to protect the internal PCB contact.
If the applied current of the external device is more than 1 A, the use
of a field supplied external relay is mandatory to limit the current in
the internal PCB contact. See the example diagram below:
X1M
(I≤1A)
240 V AC
240 V AC
a
b
c
f
d
e
g
a
Relay PCB output terminal
b
AC power supply for relay
c
Fuse ≤1 A
d
Relay (field supply)
e
Relay PCB
f
AC power supply for external device
g
External device (e.g. external alarm)
In case of R32 refrigerant, the user interface built-in alarm MUST be
15 dB louder than the background noise of the room. If this is not the
case:
1
Mount an external alarm (field supply) in every EKVDX.
2
Connect the external alarm to the relay PCB of each EKVDX or
to the SVS output channel of the outdoor unit.
3
Turn off the user interface built-in alarm if the external alarm is
installed in the same space as the user interface.
Note:
The refrigerant leakage alarm MUST be set to ON. The user
interface will generate a visible and audible warning sign in case of
R32 refrigerant leakage detection or sensor failure/disconnection.
INFORMATION
Sound data about the refrigerant leakage alarm are
available in the technical data sheet of the user interface.
E.g. the BRC1H52* controller generates an alarm of 65 dB
(sound pressure, measured at 1 m distance from the
alarm).
14.4
To connect the external input
INFORMATION
For details about the different user interface modes and
how to set up, refer to the installation and operation
manual delivered with the user interface.
WARNING
In case of R32 refrigerant, terminal connections T1/T2 are
for fire alarm input ONLY. Fire alarm has a higher priority
than R32 safety and shuts the entire system down.
T1
T2
X1M
a
a
Fire alarm
NOTICE
The user interface has to be in fully functional mode or in
alarm only mode.
15
Configuration
NOTICE
In case an EKVDX indoor unit is installed, extreme
setpoints can result in constant thermostat ON behaviour.
To prevent this, slightly increase (decrease) the respective
cooling (heating) setpoint.
INFORMATION
In case combined with EKVDX, on VAM, mode numbers
17, 18 and 19 CANNOT be used. Use 27, 28, 29.
Field settings via user interface: for EKVDX, choose indoor
unit 0. For VAM, choose indoor unit 1.
15.1
To set the discharge temperature
correction factor
The setpoint on the user interface of the EKVDX is related to the
target discharge temperature (Th4c), not to the target room
temperature. Therefore, the measured air temperature is not an
accurate representation of the room temperature. Set a correction
factor 'c' to compensate for heat transfer in the duct between the
EKVDX and the room.
Formula:
'c'=ducting length×
0.10
°C
Example:
For 10 m of duct: c=1°C.
15.2
To deactivate the R32 safety
system
During a test run of the system and during maintenance, deactivate
the R32 safety system (active by default):
1
Set VAM setting 19(29)‑15-01
2
Set one of the two EKVDX settings: 15(25)‑13-3 (=OFF for 24
hours) OR 15(25)‑13-1 (=OFF)
After completion of test run or maintenance, activate the R32 safety
system again:
3
Set VAM setting 19(29)‑15-02
4
Set EKVDX setting 15(25)‑13-02
