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Maintenance
6720813171 (2016/05)52
13.2.7 Cleaning the heat exchanger
Check the bottom and top sides of the heat exchanger for dirt.
Clean the heat exchanger with compressed air or a soft brush.
Fig. 117 Cleaning the heat exchanger
Refit the condensate collector.
Connect the flexible condensate drain hose to the condensate
collector.
Re-install the condensate trap.
Rinse the heat exchanger with clean water.
Reassemble all boiler components in reverse order:
Burner with burner seal
Burner cover with fan and gas valve
Gas valve
Glow ignitor and ionisation electrode.
Start up the boiler ( chapter 10 “Commissioning”, page 37).
13.3 Checking and adjusting the gas/air-ratio
See section 10.2.7 “Checking and adjusting the gas/air-ratio”, page 41.
13.4 Function check in operating conditions
Slowly open the gas valve by pushing on the gas valve and turning it
¼ rotation in an anticlockwise direction ( fig. 79, page 39).
Switch on the heating system by pressing the mains switch of the
BC10 basic controller [1].
Set the maximum CH flow temperature dial [8] and the DHW
temperature dial [10] to the maximum temperatures.
Enter a heat demand via the control unit and check that the boiler
starts the heating mode.
Open a hot water tap and check that the boiler starts the DHW mode.
Set the maximum CH flow temperature dial [8] and the DHW
temperature dial [10] to the required temperatures.
Fig. 118 BC10 basic controller
13.5 Service record log book
Complete the log book while carrying out needs-oriented maintenance.
Enter your signature and the date after completing the maintenance
activities.
CAUTION: Damage to the installation.
Do not use metal brushes or similar hard cleaning
tools.
CAUTION: Damage to the installation due to faulty glow
ignitor.
The glow ignitor is made from fragile ceramic material.
Do not damage the glow ignitor.
CAUTION: Damage to the installation due to dirt
particles.
Cover up the boiler interior, e. g. using a blanket or a
cover.
CAUTION: Damage to the installation due to undesired
flue gas or condensate leakage.
When installing the condensate collector, make sure
that the 2 snap closures close smoothly. If this is not
the case, the seal between the condensate collector
and the flue pipe at the back of the heat exchanger
may be leak.
6 720 648 726-118.1TD
888
1
10
9
8
7
6
5432
1
6 720 648 726-069.1TD
11
Needs-oriented maintenance activities Page
Date:
_____________
Date:
_____________
Date:
_____________
Date:
________
Date:
________
1. Cleaning the burner, heat exchanger and condensate
trap after shutting down the heating system.
49

2. Checking and adjusting the gas/air ratio:
•CO
2
content at full load
•CO
2
content at part load.
41 __________ Pa
__________ %
__________ %
__________ Pa
__________ %
__________ %
__________ Pa
__________ %
__________ %
__________ Pa
__________ %
__________ %
__________ Pa
__________ %
__________ %
3. Function testing. 52

4. Confirming proper maintenance.
Company stamp/
signature/date
Company stamp/
signature/date
Company stamp/
signature/date
Company stamp/
signature/date
Company stamp/
signature/date
Table 21
52


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