Carel k.Air, User Manual, Page: 99 / 192

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Functions k.air +030220981 rel. 1.2 - 01.12.2020
9.29 V D I 6022-1 management
k.air provides a function, based on the VDI 6022-1 standard, to improve system hygiene. Both operational and maintenance
functions are provided.
VDI management, enabled on screen Ac86, includes:
1. A specifi c menu used to fi nely calibrate the active control logic for scheduled maintenance.
2. Requirement to install a supply humidity probe if a humidifi er is used. If no probe is installed, humidifi cation is interlocked and
an incorrect confi guration alarm is shown (AL242). The maximum supply limit cannot exceed 90%. See maximum supply
humidity management under “Humidifi cation”
3. Startup due to inactivity. If the unit remains off for longer than 48 hours (Ja01, settable), a forced start-up procedure will be
activated for 5 minutes (Ja01, settable) before returning to the previous status or remaining active if, in the meantime, a re-
quest has been received to switch the unit on. This logic allows cyclical ventilation so as to avoid the formation of stagnant
condensate.
4. Startup with saturation probe. This function can be enabled on screen Ac86 and requires the installation of a saturation tem-
perature probe (downstream of the main coil). If when the unit is switched on, the saturation probe measures a humidity
higher than 80% (modifi able, with the corresponding diff erential, on screen Ja01), a drying phase is activated, keeping the
humidifi er and the coil cooling off , irrespective of the request may be. The unit status on main screen is shown as “Rh startup”.
This startup phase ends when reaching a threshold minus a diff erential.
5. Confi gurable, scheduled maintenance based on 29 counters, taken from the main checks to be carried out on the unit as per
VDI 6022-1.
Scheduled maintenance
Scheduled maintenance uses 29 counters that are started when the unit is fi rst switched ON. The time is then counted conti-
nuously, independently of the unit being switched off or any power failures. Each counter can be customised in three ways:
enabled or disabled, programmed control threshold - either 1, 3, 6, 12, 24 or 36 months, and the possibility to select whether
the deadline will be signal- only or an alarm with unit shutdown. The 29 counters refer to an extract of the checks to be carried
out as per VDI 6022. Not all 29 counters may be present, as some are disabled if the corresponding device is not fi tted on the
unit (e.g. checks the heat recovery exchanger).
Here is the extract of the checks to be carried out:
I D D escription A vailability A ction
Expiry
(months)
0.0 Hygiene inspection Check 24
1.1 Outdoor- air inlets. Check for contamination, damage and
corrosion Check, clean and repair 12
3.1 Dehumidifi er. Check for contamination, damage and
corrosion Cooling coil Check, clean 3
3.2 Dehumidifi er. Functional check of drain and trap Cooling coil Check, clean and repair 3
3.3 Dehumidifi er. Clean wet cooler, mist collector and conden-
sate tray Cooling coil Check 6
4.1 Air handling unit housing. Check for contamination, dama-
ge and corrosion on the air side Check, clean and repair 12
4.2 Air handling unit housing. Check for water precipitation Check, clean 6
4.3 Air handling unit housing. Check empty housings for
contamination, damage, and corrosion Check, clean and repair 12
6.2.1 Air humidifi er operating without recirculating water.
Check for contamination, damage, microbial growth and
corrosion Humidifi er Check, clean and repair 3
6.2.2 Air humidifi er operating without recirculating water. Check
for condensate precipitation in thehumidifi er chamber Humidifi er Check, clean and repair 1
6.2.3 Air humidifi er operating without recirculating water. Check
steam distribution system for deposits Isothermal humidifi er Check, clean 6
6.2.4 Air humidifi er operating without recirculating water. Check
spray nozzle for deposits Adiabatic humidifi er Check, clean or replace
nozzles 1
6.2.5 Air humidifi er operating without recirculating water Check
drain Humidifi er Check, clean 3
6.2.6 Air humidifi er operating without recirculating water Deter-
mine number of CFU in the humidifi er water Adiabatic humidifi er Measure bacterial colonies
in the water, if > 1000 CFU/
ml proceed with disin-
fection, clean and rinse in
general. 6
6.2.7 Air humidifi er operating without recirculating water Fun-
ctional check of control valve Humidifi er Check, clean and repair 6
6.2.8 Air humidifi er operating without recirculating water. Check
humidity limiter Humidifi er Check, clean and repair 6
8.1 Air fi lters. Check for unacceptable contamination, damage
(leakage) and odours Check, clean and if neces-
sary replace fi lters 3
8.2 Air fi lters. Check diff erential pressure Replace fi lters if necessary 6
8.3 Air fi lters. Maximum interval until fi rst fi lter stage is to be
changed Replace fi lters 12
8.4 Air fi lters. Maximum interval until second fi lter stage is to
be changed Second supply fi lter Replace fi lters 24