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7. Checking and maintenance
7.4 Standard inspection and maintenance operations
CAUTION
•
During inspection and maintenance operations,
always replace all gaskets on the parts removed.
•
During inspection and maintenance operations
always protect all electrical components from
water (dripping, sprying, etc.).
•
If connected: Inspection of LWCO and flushing
float pipes.
7.4.1. Checking the system pressure
The system pressure must reach a minimum of 11.6
psig/0.8 bar. If the water pressure is too low, the
symbol u5
14 will appear.
:
i
If necessary, top up the water level in the
heating system (recommended system
pressure between 22 - 30 psig/1.5 - 2 bar ).
7.4.2. Checking the ionization current
Check the ionization current at full load and low load.
The value is stable after 1 minute. If the value is less
than 4 μA, clean or replace the ignition electrode.
See chapter: "Reading the various current values",
page 72.
7.4.3. Checking the tightness of the flue gas
venting and air inlet connections
•
Check the tightness of the flue gases evacuation
and air inlet connections.
•
Check the condition of the vent system. Carry out a
visual check for the presence of any damages and/
or corrosion.
90
7.4.4. Checking combustion
The check on combustion is done by measuring the
percentage of O
do this, proceed as follows:
1. Unscrew the plug of the flue gas measurement
point.
2. Connect the flue gas analyser.
CAUTION
Ensure that the opening around the combustion
analyzer probe is completely sealed when taking
measurements.
3. Set the boiler to full load. Press the two buttons
simultaneously.
The symbol is visible on the menu bar and h3
appears in the display. The boiler is now operating
at full load.
4. Measure the percentage of CO
value with the checking values given.
See chapter: "Setting the air/gas ratio (Full
load)", page 69.
5. Set the boiler to part load. Press the [-] buttons
several times until l3 is displayed on the screen.
The boiler is now operating on part load.
6. Measure the percentage of CO
value with the checking values given.
See chapter: "Setting the air/gas ratio (Part
load)", page 70.
MCA Pro 45/65/90/115
/CO
in the flue gas discharge flue. To
2
2
and compare this
2
and compare this
2
MCA-Pro ISM Rv.4.1 2/2017
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