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Modules and their functions
9
Logamatic 4121, 4122 and 4126 - Subject to technical modifications.
74
9.3 FM442 function module (accessory)
The FM442 module regulates two independent heating
circuits with mixer. Several of these modules can be
used in one control unit.
The switches on the module only have service and
maintenance functions and only affect 230 V outputs.
If the switches are not set to automatic, a corresponding
message appears on the MEC2 programming unit, and
the fault indicator
illuminates.
The control functions remain operational in manual
mode.
Heating circuit function
Heating circuit switch
e.g. for heating circuits 1 and 2
The positions 0 and (manual mode) are
special settings reserved for heating contractors only.
Current functions are indicated by LEDs.
The switches on the modules only have service and
maintenance functions, and affect only the 230 V
outputs.
If the switches are not set to automatic, a message to
this effect appears on the MEC2 programming unit and
fault indicator
0 illuminates.
Fig. 23 FM442
1 Heating circuit x
2 Heating circuit y
1
2
Display General fault, e.g. on-site faults,
sensor faults, external faults, wiring
faults, internal module faults, manual
mode. Fault messages appear 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 INFORMATION
Never use the switches to shut down the
heating system during temporary absence.
Use the holiday function for this purpose
(Æ operating instructions for Logamatic
412x control unit).
USER INFORMATION
In standard mode, the switches should be
set to "AUT".
: 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
remain active.
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