![Carel kVent Manual Download Page 25](http://html1.mh-extra.com/html/carel/kvent/kvent_manual_2557421025.webp)
kVent – rel 3.1 – 22/06/2018
25
When the unit is turned ON the sequence to start, can be set
through the setting menu (H022). The two options available
are “Start fans before the regulation” or “start the regulation
before the fans”
“Start fans before the regulation”
1.
Damper ON
2.
Supply and return fans start after their own delay
3.
Supply and return keep idle speed
4.
Regulation
“Start the regulation before the fans”
1.
Damper ON
2.
Regulation
3.
Supply and return fans start after their own delay
4.
Supply and return keep idle speed
When the unit is turned OFF the sequence to stop is enabled:
1.
Keep supply and return fans ON for their own delay
2.
Close damper
The sequence is described by the graphs below:
Note: Fans will slow down to minimum speed (D029) in
case of:
1.
Recovery defrost active
2.
Supply temperature below minimum threshold
5.10 Mixing chamber control
Mixing chamber saves energy in case of air quality is fine
inside the room.
Acccording to CO
2
value, if present, a PID will calculate the
request for the mixing chamber. If the PID is higher, then the
mixing chamber will close more and more. The greater request
between CO
2
request and freecooling/freeheating, will actuate
the damper.
It’s possible to activate the mixing chamber at startup to reach
setpoint temperature quickly. When setpoint is reached, the
mixing chamber comes to regulate according to CO
2
.
5.11 CO
2
Regulation
A signal is split and has a direct impact on the degree of
participation of outside air and provides a correction signal to
drive the VFD. VFD correction signal is limited to the MAX
allowable adjustments.
5.12 Boost function
This function tourn on to a certain percentage the heating and
cooling request (A070; B021; C63) in the unit is in the mode
(confort-preconfort or economy).
From the board the function can be enable from the mode
menu (X00b), or by TH-Tune pressing thogheter the buttons
“Clock+Mode” for 3s.
The maximum Boost time is settable on the “Setting menu”,
through the parameter H023.
5.13 Minor functions
Antistack procedure
5.13.1
In case of pumps or steam configured, kVent checks if the
pumps stayed OFF for a long time. After a settable time of
pump off, it has to start in any condition to avoid the risk of
stack. The valve stays closed. Time is not saved in permanent
memory.
Fire alarm
5.13.2
In case of fire alarm by digital input or in case of exhaust
temperature > 70°C, the fire alarm procedure is activated.
All the devices are stop, but the fan can run according to
service parameter.
Filter alarm
5.13.3
When the dirty filter alarm is active, it is possible to increment
the fans speed of a settable percentage (D041).
NFC
5.13.4
kVent manages Near Field Comunication of the controller. The
application publics in NFC tag the following parameters:
•
Supply setpoint in ECONOMY
•
Supply setpoint in PRECOMFORT
•
Supply setpoint in COMFORT
•
Room setpoint in ECONOMY
•
Room setpoint in PRECOMFORT
•
Room setpoint in COMFORT
•
Working mode
With NFC app in the smartphone is possible to read those
values and write them, even with controller not powered.
5.14 Import/Export parameters
This function is available from the menu F: Unit cfg.
Here below the parameters and their descriptions present on
the mask:
•
I013: Imp/Exp, is possible to set if the user want
import or export the parameters from the kVent+
•
I014: Memory, it is the parameter to chose where
store or take the file, the possibility are: from
internal memory or from a USB key
•
I015: Name: is possible to set the file name to
import or export the name must be write
“EXPORT_XX” where XX can go from 00 to 99
•
I016:Confirm, it is to run the import or export
Fans
Supply
Exhaust
ON delay
D022
Unit ON
Idle time
D028
Idle time
D023
Damper
OFF
Delay
D025
OFF delay
D026
Unit OFF
Idle power
D024
Idle power
D029
ON delay
D027
CO2 [ppm]
Set
Fan set
D034
D035
100%
0%
Mixing
E026
E027
Max compensation
D036