O
PERATION
OF
THE
BUILDING
MANAGEMENT
SYSTEM
(BMS)
H
EAT
RECOVERY
UNIT
en-52
en
337 Alarm functions
4.1.7 Reading out current errors
The current operation of the unit can be read out in register
address 221.
V
ALUE
O
PTION
D
ESCRIPTION
30
Smoke extraction
When the contact is closed:
• air is extracted (maximum fan speed).
• no air is supplied.
• an alarm signal (smoke) is sent to the building manage-
ment system.
31
Fire mode
When the contact is closed:
• the unit is switched off.
• any air dampers are closed.
• an alarm signal (fire) is sent to the building management
system.
40
Smoke alarm
When the contact is closed:
• an alarm signal (smoke) is sent to the building manage-
ment system.
41
Fire alarm
When the contact is closed:
• an alarm signal (fire) is sent to the building management
system.
REGISTER
ADDRESS
DESCRIPTION
RO
/
RW
*
CONTROL
UNIT
MINI
-
MUM
MAXI
-
MUM
DEFAULT
221
Current mode operation
ro
-
01
51
-
*ro = read only (read only)
*rw = read & write (read and write)
