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• Setting at PMIN* :
= Adjustment MIN.VENT.
(see table below)
a) Turn the rotary button to select PMIN:
The boiler runs at minimum speed PMIN or low load.
b) Check that the fan speed displayed corresponds to the value indicated in the table below depending on the gas
type and the boiler model:
(Settings for France. For the other countries: Refer to the instruction manual delivered with the boiler)
Values at low load
PMIN
(For France)
MCA 10
5.9
MCA 15
5.9
MCA 25
5.9
MCA 25/28 MI
5.9
MCA 25/28 BIC
5.9
MCA 35
5.5
Nominal value
(1)
c) If necessary, adjust the fan speed parameters :
For France: See APPENDIX hereafter.
For other countries: Refer to the instruction manual delivered with the boiler.
d) Mesure the O
2
e) If this rate does not match the required value:
•
correct the gas/air ratio using the adjustment screw B on the gas valve unit :
Turn the screw B clockwise to increase the O
•
Check the flame through the flame inspection window: The flame must be stable and blue in colour with
orange particles around the edge of the burner.
f) Repeat the high speed test at PMAX and the low speed test at PMIN as often as necessary until the O2
values are in the indicated range.
*Remark: In the case of the previous gas valve type VK4115V E1311, only the setting at PMIN is possible.
Q
C002348-E-01
Gas H (G20)
MIN.VENT.
O
(%)
2
rpm
(1)
1800
- 6.3
(1)
1800
- 6.3
(1)
1800
- 6.3
(1)
1800
- 6.3
(1)
1800
- 6.3
(1)
1700
- 5.9
Value at
PMIN
value at PMIN (Front panel removed):
Gas L (G25)
MIN.VENT.
O
(%)
2
rpm
(1)
1800
5.7
- 6.1
(1)
1800
5.7
- 6.1
(1)
1800
5.7
- 6.1
(1)
1800
5.9
- 6.3
(1)
1800
5.7
- 6.1
(1)
1700
5.3
- 5.7
Value at
PMIN
value and anti-clockwise to decrease the value.
2
3/7
B
B
Propane (G31)
MIN.VENT.
O
(%)
2
rpm
(1)
2200
5.8
- 6.1
(1)
2200
5.8
- 6.1
(1)
1800
5.8
- 6.1
(1)
1800
5.8
- 6.1
(1)
1800
5.8
- 6.1
(1)
1700
5.8
- 6.1
Value at
PMIN
IT2652C-en
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