Weishaupt thermo condens WTC 15-A, Installation And Operating Instructions Manual, Page: 35 / 94

35
5
Procedure
1. Select parameter 39 in the heating engineer level
and call up the entry mode by pressing the key,
the unit carries out a calibration (duration
approx. 60 sec). This calibration creates a new
SCOT
®
base value.
Fine tuning the O
2
value
Fine tuning the O
2
value is included in an automatic
function sequence with 3 steps.
This sequence allows the combustion to be optimised on
site using parameters P39 and P72.
60 sec.
2. Following the calibration, the O
2
value can be adjusted,
whereby the value displayed is almost equal to the
percentage value of the O
2
adjustment.
The new value can be saved by pressing the
key.
3. The WTC now modulates to the minimum rating, where
possible deviations in the lower ratings range can be
equalised by adjusting P72.
The entry is carried out, as for P39, as O
2
adjustment
value.
Note Following an adjustment with P39 (adjustment
effective across the total modulating range)
and/or P72 (adjustment effective across mini-
mum load range of 33–50% rating) the O
2
content at maximum and minimum rating must
be checked.
5,4
5,3
5,2
5,1
5,0
4,9
4,8
4,7
O
2
fine tuning with P39
Min. load Nominal load
O
2
content flue gas [%]
O
2
value after calibration
O
2
value after adjustment with P3
9
5,4
5,3
5,2
5,1
5,0
4,9
4,8
4,7
O
2
fine tuning with P72
Min. load Nominal load
O
2
content flue gas [%]
O
2
value after adjustment with P72
O
2
value after adjustment with P3
9