16
Weather-compensated control unit
Constant temperature control unit
Service menu
1. Press
OK
and
å
simultaneously for approx. 4 s.
2.
"Service functions"
3.
"Max. output"
4.
"Change?"
Select
"Yes"
.
A value is shown on the display (e.g.
"85"
). In the
delivered condition, this value is 100 % of the rated
heating output.
5. Set the required value.
Service menu
1. Press
OK
and
å
simultaneously for approx. 4 s.
2. Select
"
3
"
using
Ú
. Confirm with
OK
.
The display shows
"FL"
and
"ON"
flashes.
3. Confirm with
OK
.
4. The display shows the set heating output (e.g.
"85"
)
and
"
A
"
. In the delivered condition, this value is
100 % of the rated heating output.
5. Set the required value. Confirm with
OK
.
Checking the combustion chamber pressure switch
The combustion chamber pressure switch responds in
the event of deflagration, blocks the burner and pre-
vents flue gas escaping if the flue system is damaged.
Check whether the combustion chamber pressure switch has responded
4
3
2
1
Fig. 5
Measure the resistance across terminals 1 and 3. If the
resistance is > 0
Ω
, the pressure switch has respon-
ded.
If the combustion chamber pressure switch has
responded, check the following components and
replace if necessary:
■
Electrodes
■
Burner gauze assembly
■
Ignition transformer and ignition cables
■
Check the flue system for damage and leaks.
Checking the function of the pressure switch
A
B
C
Fig. 6
A
Reset button
B
Connection hose connecting point
C
Plug-in connection
1.
Remove connection hose.
Check function of combustion chamber pressure
switch at connection hose connecting point
B
using a pressure tester.
2.
Determine the switching point. Switching point
100
±
10 mbar. If the value measured differs from
this, replace the combustion chamber pressure
switch.
Commissioning, inspection, maintenance
Setting the maximum heating output
(cont.)
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