DeDietrich C 330 Series Installation, User And Service Manual page 53

Fig.60
AUTO => PMIN
0 2 4 6 8 10 12 14
GENE :
BOILER TEMP.
E 1
CURRENT
2 WIND SPEED
1
D
2
bar
# F  !
% $
AUTO
J I
STD
Fig.61 Adjusting screw B
3
B
2.5
B
7600532 - v.11 - 13122018
16 18 20 22 24
PMIN
68°C
10µA
1850 tr/min
:
<
C002348-F-04
AD-0000493-01
3. Confirm the selection.
The boiler is now set to low load.
Checking/setting values for O
1. Measure the percentage of O
2. Compare the measured value with the checking values in the table.
Tab.38 Checking and setting values for O
gas)
Values at low load for G20 (H gas)
C 330 ECO
C 630 ECO
(1) Nominal value
Caution
The O values at low load must be higher than the O
2
full load.
3. If the measured value is outside of the values given in the table,
correct the gas/air ratio.
4. Using the adjusting screw B, set the percentage of O
being used to the nominal value. This should always be inside the
highest and lowest setting limit. The direction in which the adjusting
screw must be turned to increase or decrease the gas flow is
indicated on the gas valve unit.
Important
The 5- to 9-section boilers are supplied with a different gas valve
unit from the 10-section boiler. See drawing for the position of
adjusting screw B for full load.
5. Check the flame through the inspection window.
Important
The flame must not blow off.
6. Repeat the full load test and the low load test as often as necessary
until the correct values are obtained.
7. Set the boiler back to the normal operating status.
7 Commissioning
at low load
2
in the flue gases.
2
at low load for G20 (H
2
O
4.8
4.8
2
for the gas type
2
(%)
(1)
2
- 5.4
(1)
- 5.4
(1)
values at
53