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Functions k.air +030220981 rel. 1.2 - 01.12.2020
9.8 S et point compensation with outside air probe
The control set point can be adjusted according to the temperature read by the outside air probe, adding or subtracting an
off set. The off set is proportional to the deviation of the outside temperature from the start compensation threshold. The confi -
guration parameters are diff erent for heating and cooling mode.
The fi gure shows an example of a compensation in cooling mode with supply temperature control.
30220980_161_R01
Max_comp_offs
0%
Cool_thr
Ext_T
Supply set offset
delta
Key
Supply set off set Supply set point off set
Max_comp_off s Maximum compensation off set
Ext_T Outside temperature
Cool_thr Cooling threshold
delta Diff erential
Fig. 9.q
Note:
the function requires an outside air temperature probe: if there is an alarm on this probe, the function is disabled.
R if D escription D ev Min Max UoM D ir Modbus BAC net
U N IT
Aa84 Enable setpoint compensation by external temperature FALSE 0 1 - R/W CS195 BV195
Aa87 Cooling: external temperature compensation threshold 25.0 -50.0 90.0 °C R/W HR1179 AV2689
Cooling: external temperature compensation delta 7.0 -30.0 30.0 °C R/W HR1180 AV2690
Cooling: maximum compensation off set 2.0 -20.0 10.0 °C R/W HR1181 AV2691
Aa90 Heating: external temperature compensation threshold 0.0 -50.0 90.0 °C R/W HR1182 AV2692
Heating: external temperature compensation delta -8.0 -30.0 30.0 °C R/W HR1183 AV2693
Heating: maximum compensation off set -2.0 -20.0 10.0 °C R/W HR1184 AV2694
Tab. 9.p
9.9 C oils
k.air can manage up to three coils, called preheating, main and reheating. Each of these has diff erent characteristics and requi-
rements. The table below summarises the main features, while the details are described in the chapters corresponding to each
control function.
C oil Mode Type C ontrol
Preheating Heating only 1. Modulating water coil • Main temperature control in heating mode
• Frost
protection
• Minimum temperature limit for adiabatic humidifi cation
2. Progressive steps
3. Binary steps
4. Capacity modulation
(multi-stage)
5. Modulating water coil, 3 position
Main Heating only
Cooling only
Mixed (reverse cycle) 1. Modulating water coil • Main temperature control in cooling mode as the only active
device
• Main temperature control in heating mode as stage after prehe-
ating, where featured.
• Dehumidifi cation control
• Frost protection
• Minimum temperature limit for adiabatic humidifi cation
2. Progressive steps
3. Binary steps
4. Capacity modulation
(multi-stage)
5. Modulating water coil, 3 position
6. Integrated direct expansion
7. Direct expansion with μChiller
Reheating Heating only 1. Modulanti ad acqua • Main temperature control in heating mode as the last stage
• Reheating during dehumidifi cation
• Frost
protection
• Minimum temperature limit for adiabatic humidifi cation
2. Step progressivi
3. Step binari
4. Modulazione di potenza
(multistadio)
5. Modulanti ad acqua 3 punti
Tab. 9.q
R if D escription D ev Min Max UoM D ir Modbus BAC net
U N IT
Ac08
PreHeating coil type 0 0 5 - R/W HR1296 PIV2804
Main coil type 0 0 7 - R/W HR1297 PIV2805
PostHeating coil type 0 0 5 - R/W HR1298 PIV2806
Tab. 9.r