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3. In order to activate the 0–10 V demand control mode for the external BMS, remove the jumper
(JP1) between terminals "M2-5" and "M2-6 (FREE)" on the AHU kit's terminal connector of
section F. Make sure that all other jumpers remain intact.
4. For advanced version only:
On the AHU kit's terminal connector of section F, disconnect the white wire from terminal "M2-1"
and the red wire from terminal "M2-2".
For medium version: Proceed with step 5.
5. In 0–10 V demand control mode, in order to achieve the default relation of voltage versus
capacity as shown in step 7, adapt the wiring on the AHU Kit's terminal connector of section F
as follows (see also →
For advanced version: Remove the jumpers from M2-1, M2-2 to M2-3 and M2-4 and connect
the positive pole ("+") to "M2-3" and the negative pole ("–") to "M2-4".
For medium version: Connect the positive pole ("+") to "M2-3" and the negative pole ("–") to
"M2-4".
6. Close the AHU Kit enclosure again (see →
p.
49).
7. Via the signal wiring from the external BMS, select the 0–10 V demand control functionality as
follows:
Input
Voltage* (V)
Demand (% of
nominal current)
Indoor unit start /
stop
1 No cut/Stop: AHU system / indoor unit is completely switched off.
2 No Limit: No restrictions applied by BMS to AHU system / indoor unit performance (equivalent to "full-load operation" of AHU system / indoor unit).
Note:
The control system is based on the rule that the last command within a sequence always takes
precedence over the previous commands. In order to avoid unexpected control behaviour in a
system where both 0-10 V demand control signals and digital input signals are being used, it is
very important to ensure that the DI signals are applied BEFORE applying the demand control
signals.
7.2.4 Error Codes
Error Code
HHH
LLL
7.2.5 Maintenance and Service
In normal operation, the thermostat is maintenance-free.
To prolong its lifecycle, the following precautions should be observed:
● Protect the electronic components from condensation moisture.
● Avoid touching the buttons with fingernails or other pointed objects to prevent damage
or premature wear of the touch-senstive buttons.
● Prevent excessive dust formation on the controller.
● Occasionally clean the front side of the controller with a damp cloth while the controller
is switched off.
AHU Kit – Installation Instructions – 11/2021
5.3 Terminal board layout, p.
0
1.0
1.5
2.0
2.5
3.0
3.5
No cut
40
45
50
55
60
1
Stop
1
66).
4.1.1 Installation of AHU Kit – MAH2/PAH2 – step 6,
4.0
4.5
5.0
5.5
6.0
6.5
65
70
75
80
85
90
95
Start
Meaning
Sensor breakage or polarity inversion.
Measured value is above the valid upper limit.
Sensor short-circuit or polarity inversion.
Measured value is below the valid lower limit.
Control
7.0
7.5
8.0
8.5
9.0
9.5
No limit / Full
100
105
110
115
120
capacity
111
2
7
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