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Modules and their functions
9
Logamatic 4321/4322 - Subject to technical modifications.
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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 switches on the module are only provided for
service and maintenance functions.
If the switches are not set to automatic, a corresponding
message appears on the MEC2 programming unit, and
the fault indicator
illuminates.
Heating circuit function
Heating circuit switch e.g. for heating circuit 1
or 2.
The positions 0 and
3
(manual mode) are special
settings reserved for qualified personnel only.
Current functions are indicated by LEDs.
Fig. 24 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 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 switch off the
system when you have to temporarily
leave the installation.
Use the holiday function for this purpose
(Æ Chapter 7.16).
USER INFORMATION
The 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.
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