Appendix
0020209591_01 ecoTEC plus Installation and maintenance instructions 57
6 Circulation pump remote control
7 Power coding resistor
8 Return temperature sensor
9 Flow temperature sensor
10 Fan
11 Contact thermostat/burner off
12 24 V DC room thermostat
13 Bus connection (digital room thermostat/controller)
14 Diverter valve
15 Water pressure sensor
16 Impeller sensor
17 Warm start sensor
18 Hot water sensor
19 Gas group coding resistor
20 Auxiliary relay (select via D.026)
21 Internal pump
22 Ignition electrode
* Depending on product type
F Inspection and maintenance work – Overview
The table below lists the manufacturer requirements with respect to minimum inspection and maintenance intervals. If na-
tional regulations and directives require shorter inspection and maintenance intervals, you should observe these instead of
the intervals listed in the table.
No. Work
Inspection
(annual)
Mainten-
ance
(must be
carried out
at regular
intervals)
1
Check the air/flue pipe for leak-tightness and to ensure that it is fastened correctly. Make sure
that it is not blocked or damaged and has been installed in accordance with the relevant Installa-
tion Manual.
X X
2
Check the general condition of the product. Remove dirt from the product and from the vacuum
chamber.
X X
3
Visually inspect the general condition of the Thermoblock. In doing so, pay particular attention
to signs of corrosion, rust and other defects. If you notice any damage, carry out maintenance
work.
X X
4
Check the gas flow pressure at maximum heat input. If the gas flow pressure is not within the
correct range, carry out maintenance work.
X X
5
Check the CO₂ content (the air ratio) of the product and, if necessary, adjust it. Keep a record of
this.
X X
6
Disconnect the product from the power mains. Check that the electrical plug connections and
other connections are seated correctly and correct these if necessary.
X X
7
Close the gas isolator cock and the service valves.
X
8
Drain the product on the water side (observe the pressure gauge). Check the pre-charge pres-
sure of the expansion vessel, and top up the vessel if necessary (approx. 0.03 MPa/0.3 bar un-
der the system filling pressure).
X
9
Remove the compact thermal module.
X
10
Check the insulating mats in the combustion area. If you notice any damage, replace the insu-
lating mats. Replace the burner flange seal each time it is opened and accordingly each time
maintenance work is carried out.
X
11
Clean the heat exchanger.
X
12
Check the burner for damage and replace it if necessary.
X
13
Check the condensate trap in the product, clean and fill this, if required.
X X
14
Install the compact thermal module. Caution: Replace the seals.
X
15
Products with integrated hot water generation only: If the volume of water is insufficient or the
outlet temperature is not reached, replace the secondary heat exchanger if necessary.
X
16
Products with integrated hot water generation only: Clean the filter in the cold water inlet. Re-
place the filter if impurities can no longer be removed or if the filter is damaged. In this case, also
check the impeller sensor for dirt and damage, clean the sensor (do not use compressed air for
this) and replace the sensor if it is damaged.
X
17
Open the gas isolator cock, reconnect the product to the power mains and switch the product on.
X X
18
Open the service valves, fill up the product/heating installation to 0.1-0.2 MPa/1.0-2.0 bar (de-
pending on the static height of the heating installation) and start the purging programme P.00.
X
19
Perform a test operation of the product and heating installation, including hot water generation,
and purge the system once more if necessary.
X X
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