Modules and their functions
9
Logamatic 4321/4322 - Technical specifications are subject to change without prior notice.
65
9.1
ZM434 burner and boiler circuit module (standard equipment)
The ZM434 module is part of the standard equipment
level of the Logamatic 4321 and 4322 control panels.
The manual switches on the module are only provided
for service and maintenance functions.
If the manual switches are not in automatic position, the
MEC2 shows a message to this effect and the
0
fault
display lights.
The control functions continue to operate in manual
mode.
Burner function
Manual burner switch
]
The
0, manual
and
max I + II
positions are special
settings reserved for use by technicians in case of faults.
The burner can be controlled directly with the manual
switch. The control continues to operate.
Fig. 21
ZM434
Display
0
General fault,
e.g. on-site fault, sensor fault,
external faults, wiring faults,
internal module faults,
manual operation.
The fault messages are shown
as plain text in the
MEC2 remote control.
LEDs for burner functions
Display
9
Burner fault
Display
A
Burner operational
Display
U
Modulation output is increased/
stage 2 operational
Display
V
Modulation output is reduced
LEDs for boiler circuit functions
Display
1
Boiler in summer mode
Display
8
Boiler pump operating
Display
U
Mixing valve opens towards boiler
Display
V
Mixing valve opens towards heating zone
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".
