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Modules and their functions
9
Logamatic 4121, 4122 and 4126 - Subject to technical modifications.
75
9.4 FM445 function module (Logamatic 4126)
The FM445 module controls DHW heating via a primary
system.
Plug it into the r.h. slot (slot 2) of the control unit; this
ensures the power supply to all other modules. Only use
this module if no other FM441 has already been installed
in the control unit.
The switches on the module are for service and
maintenance purposes and only affect 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.
The control functions remain operational in manual
mode.
Fig. 24 FM445
Display 0 General fault,
e.g. on-site faults,
sensor faults, external faults,
wiring faults, internal
module faults, manual mode.
The fault messages appear as plain text on
the MEC2 programming unit.
LEDs for the following functions:
Display X DHW is/remains below the set temperature in
setback (night) mode
Display U "Mixer opens" (hotter)
Display V "Mixer closes" (colder)
Display 8– P Cylinder primary pump operational
Display 8– S Cylinder secondary pump operational
Display 8– Z DHW circulation pump operational
Display Z Thermal disinfection
Display } Anti-scaling protection enabled,
secondary pump cycles
USER INFORMATION
Never use the switches to shut down the
heating system during temporary absence.
Use the holiday function for this purpose
(Æ
chapter Chapter 7.16).
75


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