Buderus Logamatic 4323 - FM442 Function Module (Accessory)

Modules and their functions
9
Logamatic 4323 - Subject to technical modifications.
70
9.3 FM442 function module (accessory)
The FM442 module regulates two independent heating
circuits with mixer.
Several FM442 modules can be utilised in your control
unit.
The manual switches on the module are only provided
for service and maintenance functions.
If the manual switches are not set to automatic,
a
corresponding message is displayed on the MEC2
programming unit, and the fault indicator
illuminates.
Heating circuit function
Manual heating circuit switch e.g. for heating
circuit 1 or 2
Positions 0 and
3
(manual mode) are special settings
reserved for installers only.
Current functions are indicated by LEDs.
Fig. 25 FM442 function module
1 Heating circuit x
2 Heating circuit y
1
2
Display General fault, e.g. on-site fault,
sensor fault, external faults,
wiring fault, internal module
fault, manual mode.
The fault messages are
displayed as plain text on the
MEC2 programming unit.
LEDs for the following functions:
Display "Mixer opens" (hotter)
Display "Mixer closes" (colder)
Display Heating circuit in summer
mode
Display Heating circuit pump
operational
USER NOTE
Never use the manual switches to switch
off the system when you have to
temporarily leave the installation.
Use the holiday function for this purpose
(Æ
Chapter 7.16).
USER NOTE
The manual switch should normally be set
to "AUT".
3: The heating circuit pump is switched on.
The mixer is switched volt-free and can be
manually operated.
AUT:
The heating circuit operates in automatic
mode.
0:
The heating circuit pump is switched off.
The mixer is switched volt-free. The control
functions continue to be active.