HR MANUAL OPERATION VIA MODBUS
Manual version 4.1 (26-07-2018)
en-55
en
4.1.4 Automatic CO
2
control
The unit automatically adjusts the fan speed (and any recircula-
tion damper) to the CO
2
level.
The CO
2
level is supplied by the building management system
(BMS) or, if this information is not available, by a CO
2
sensor
(accessory) on X377 (via connection X3).
n If no CO
2
sensor is detected, the device will operate
in fan setting 1 (ventilation).
Fan speeds with stepped controls
REGISTER
ADDRESS
DESCRIPTION VALUE
275 (1) Select modes 2 = allowed: automatic
3 = allowed: manual, automatic
425 (0.6) Automatic or manual control 1 = automatic
CO
2
LEVEL FAN
SPEED
< 1 without recirculation module 0 (off)
with recirculation module 1 (recirculation)
< 2 1 (ventilation)
< 3 2 (ventilation)
> 3
3 (ventilation)
REGISTER
ADDRESS
DESCRIPTION RO
/RW* UNIT MINIMUM MAXIMUM DEFAULT
351 (62.2) CO
2
level 1 rw ppm 200 2000 800
352 (62.3) CO
2
level 2 rw ppm 200 2000 1000
353 (62.4) CO
2
level 3 rw ppm 200 2000 1200
432 CO
2
level from BMS rw ppm 0 2000 0
151 Input voltage, analogue input X377 ro 0.01 V - - -
*ro = read only (read only)
*rw = read & write (read and write)
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