Buderus Logamatic 4321, Operating Instructions Manual

Page: 69 / 80

Modules and their functions 9
Logamatic 4321/4322 - Technical specifications are subject to change without prior notice. 69
9.3 FM442 function module (accessory)
The FM442 module controls two independent heating
zones with mixing valve.
Several FM442 modules can be used in your control
panel.
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 appears on the MEC2 remote
control, and the fault indicator
lights up.
Heating zone function
Manual heating zone switch e.g. for heating
zone 1 or 2
Positions 0 and
3
(manual mode) are special settings
reserved for contractors only.
Current functions are indicated by LEDs.
Fig. 24 FM442 function module
1 Heating zone x
2 Heating zone 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 remote control.
LEDs for the functions
Display "Mixing valve opening" (hotter)
Display "Mixing valve closing" (colder)
Display Heating zone in summer mode
Display Heating pump in operation
USER NOTE
Do not use the manual switches to shut off
the installation for temporary absence.
Use the vacation function for this purpose
(
Æ
Chapter 7.16).
USER NOTE
The manual switch should normally be set
to "AUT".
3
:
The heating pump is switched on.
The mixing valve is switched to zero volt
and can be manually operated.
AUT:
The heating zone is operating in automatic
mode.
0:
The heating pump is switched off.
The mixing valve is switched to zero volt.
The control functions continue to operate.