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5.3.1 Burner function
Flue gas test
B Press and hold button Flue gas test (
few seconds.
The heating control unit operates for 30 minutes at a higher flow
temperature.
During the flue gas test, the indicators Fault and Summer mode flash
alternately.
To terminate the flue gas test:
B Press button Flue gas test again.
Manual burner switch
In normal operation, the manual switch is set to AUT.
Positions 0, Manual and max I + II of the burner's manual switch are
special settings (
fig. 11, [7], page 10) reserved for contractors.
The burner may be directly controlled with the manual switch.
Current functions are indicated by LEDs.
Position
Function
As base load, only the first stage will be
AUT
0
enabled for single and two stage burners. The
second stage is at zero volts. The burner
max
I+II
servomotor cannot be reversed. For
modulating burners, the burner output can be
increased using
The burner operates in automatic mode.
AUT
0
max
I+II
The burner is switched OFF. Except when the
AUT
0
burner emergency switch is set to Manual.
max
I+II
The burner operates continuously at maximum
AUT
0
output.
max
I+II
Table 8 Burner functions ZM422
5.3.2 Heating circuit and DHW functions
In normal operation, the manual switch is set to AUT.
Positions 0 and Manual are special settings of the manual switch for the
heating circuit and DHW (
fig. 11, [6], page 10) reserved to
contractors.
Current functions are indicated by LEDs.
CFB 840
fig. 11, [11], page 10) for a
and reduced using
.
Position
Function
The heating circuit 0 pump or boiler pump and
the cylinder primary pump are switched on.
Heating circuit 0 pump or the boiler circuit and
DHW circuit operate in automatic mode.
Heating circuit 0 pump or boiler pump, the
cylinder primary pump and DHW circulation
pump are switched off. The control functions
remain active.
Table 9 Heating circuit and DHW functions ZM422
5.4
FM442/CMM 920 function module (accessory)
The FM442/CMM 920 module regulates two independent heating
circuits with optional mixing valves. Several of these modules can be
used in one control unit.
The manual switches on the module only have service and maintenance
functions and only affect 230 V outputs.
If the manual switches are not set to automatic, a corresponding
message appears on the programming unit, and the corresponding
indicator Fault illuminates.
Never use the manual switch to shut down the heating
system during temporary absence. Use the holiday
function for this purpose (
for control units).
The control functions remain operational in manual mode without any
restrictions.
Fig. 12 FM442/CMM 920
[1]
General fault,
e.g. on-site faults, sensor faults, external faults, wiring faults,
internal module faults, manual mode. The error messages appear
as plain text in the programming unit.
[2]
Heating circuit in summer mode
[3]
Heating circuit pump operational
[4]
"Mixing valve opens" (hotter)
[5]
"Mixing valve closes" (colder)
[6]
Manual heating circuit switch
e.g. for heating circuit 1 and 2
Modules and their function | 11
see operating instructions
1
2
3
4
5
6
6 720 803 703-13.1T
6 720 802 836 (2012/05)
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