Biddle HR 25 - Page 56

OPERATION VIA MODBUS HEAT RECOVERY UNIT
en-56
en
4.1.5 Ventilation/Recirculation/Night cooling
426 Mode: ventilation/recirculation/night
cooling
The unit is designed to use heat recovery on ventilation air.
Depending on the type and the settings, the unit can also
recirculate or supply ventilation air without heat recovery
from extracted air (night cooling).
Note:
n Register address 301 must have the value 1 (default)
(100% recirculation/ventilation).
4.1.6 Alarm functions
In emergencies, the unit can emit an alarm signal or even
actively deal with the problem by functioning in a special
mode.
This special operation replaces the normal operation of the
unit (during the day and at night time) until the signal is no
longer active (435 is 0 again).
REGISTER
ADDRESS
DESCRIPTION RO
/RW* UNIT MINIMUM MAXIMUM DEFAULT
426 Mode: ventilation/recirculation/
night cooling
rw - 0 10 0
*ro = read only (read only)
*rw = read & write (read and write)
VALUE DESCRIPTION
UNIT
FUNCTION ON
(DAYTIME)
UNIT FUNCTION OFF
(NIGHT TIME)
0recirculation
(only functional in the case of units
with a recirculation module and in
manual control)
recirculation
(no heat recovery)
off
2 ventilation
(only functional in manual control)
ventilation
(heat recovery from the
extracted air)
off
10 ventilation with night cooling ventilation
(heat recovery from the
extracted air)
ventilation (fan speed 2)
(cooling with fresh air via by-
pass, no heat recovery)