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3. Check the combustion settings O
a) Connect the flue gas analyser. Ensure that the opening around the sensor is perfectly sealed when
taking measurements.
b) In the main display, press key
• Setting at PMAX* :
MAX.VENT setting.
=
(See table below)
c) Turn the button and select PMAX : the boiler runs at PMAX maximum speed or full load.
d) Check that the fan speed displayed corresponds to the value indicated in the table below:
(Settings for France. For other countries: Refer to the instruction manual delivered with the boiler)
Values at full load
PMAX
O
2
(For France)
MCA 10
4.7 - 5.2
MCA 15
4.7 - 5.2
MCA 25
4.7 - 5.2
MCA 25/28 MI
4.7 - 5.2
MCA 25/28 BIC
4.7 - 5.2
MCA 35
4.3 - 4,8
Nominal value
(1)
Fit the diaphragm for
(2)
propane into the
gas valve
e) If necessary, adjust the fan speed parameters.
For France: See APPENDIX hereafter
For other countries: Refer to the instruction manual delivered with the boiler.
f) Mesure the O
2
If this rate does not match the required value:
correct the gas/air ratio using the adjustment screw A on the gas valve unit:
•
The screw A is a worm screw, which adjusts the restrictor A'.
Depending on the position of the restrictor A', the O
•
Check the flame through the flame inspection window: The flame must not be detached.
*Remark: Note: In the case of the previous gas valve type VK4115V E1311, only the setting at PMIN is possible.
Q
at PMAX and PMIN, to do so:
2
: the menu EMISSION MEASURMENTS is displayed
Gas H (G20)
MAX.VENT.BOIL
(%)
rpm
(1)
3300
(1)
4500
(1)
5600
(1)
4600
(1)
4600
(1)
6200
Value at
PMAX
rate at PMAX (Front panel removed)
Gas L (G25)
MAX.VENT. BOIL
O
(%)
2
rpm
(1)
3300
4.4 - 4.9
(1)
4500
4.4 - 4.9
(1)
5600
4.4 - 4.9
(1)
4600
4.4 - 4.9
(1)
4600
4.4 - 4.9
(1)
6200
4.1 - 4.6
Value at
PMAX
level decreases or increases.
2
2/7
A'
A
Propane (G31)
MAX.VENT. BOIL
Diaphragm
O
(%)
2
rpm
Ø mm
(1)(2)
(2)
4.7 - 5.2
3.00
(1)(2)
(2)
4.7 - 5.2
3.00
(1)(2)
(2)
4.7 - 5.2
4.00
(1)(2)
(2)
4.7 - 5.2
4.00
(1)(2)
(2)
4.7 - 5.2
4.00
(1)
-
4.7 - 5.2
3200
4400
5300
4300
4300
6200
Value at
PMAX
IT2652C-en
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