Inspection and maintenance
Installation and maintenance instructions ecoTEC plus 0020116700_01 61
12
12.2 Inspection and maintenance work steps
No. Activity
Column 1
Inspection must
be carried out
each year
Column 2
Maintenance
must be carried
out at regular
intervals – but
no longer than
5 years
1
Check the air flue gas installation for leaks and for proper fixation and ensure it is not blocked
or damaged and is fitted correctly, complying with the relevant installation instructions.
xx
2 Carry out a general inspection of the boiler for dirt and dust and clean as necessary. x x
3
Visually inspect the complete heat engine for its general condition and for signs of corrosion,
sooting or other forms of damage. If damage is evident proceed to column 2.
xx
4
Measure the gas flow rate during operation with maximum load (¬section10.11.3). If the gas
flow rate complies to the ¬table10.2 continue with column 1, if not proceed to column 2.
xx
5
Check the gas inlet working pressure (¬section10.11.4) operation with maximum load. If the
gas inlet working pressure complies to the ¬table10.3 continue with column 1, if not proceed
to column 2.
xx
6
Check combustion by measuring CO, CO
2
and CO/CO
2
. If the values are outside the
tole rances of ¬table12 proceed to maintenance column 2. You must not proceed with the
maintenance if a new burner door seal kit is not available.
x
7
Isolate the boiler from the power mains. Check whether the electrical plug connections and
the other electrical connections are fitted tightly and correct them if necessary.
xx
8 Close the gas isolation valve and the service valves. x
9
Drain the pressure in the boiler on the water side (observe pressure gauge) and check the
charge pressure of the expansion vessel. Top up if necessary.
x
10
Only with VUW boilers with actoSTOR: Check the charge pressure in the expansion vessel of
the layered storage tank. Correct the pressure if necessary.
xx
11 Remove the compact thermal module. x
12
Check the integrity of all combustion circuit seals, especially the burner door seal. Ensure any
damage found is repaired before proceeding.
x
13 Clean the heat exchanger (¬section12.4.2). x
14 Check whether the burner is dirty and clean it if necessary. x
15
Check the condensate siphon in the boiler, clean and fill. Flush through all discharge pipe work
(ensure route and termination are correct and it is unlikely to freeze up in severe weather).
xx
16 Install the compact thermal module. Caution: Use new seals and nuts! x
17
For VUW boilers:
Replace the hot water heat exchanger if the volume of water is insufficient or the output tem-
perature is not reached
x
18
For VUW boilers:
Remove the impeller sensor, clean the filter in the cold water inlet of the sensor and refit the
sensor.
x
19 Service the domestic hot water cylinder (see note below).* x x
20
Open the gas isolation valve, reconnect the boiler with the power mains and switch on the
boiler.
xx
21
Open the service valves and fill up the boiler/appliance to approximately 0,1 - 0,2MPa (1,0 - 2,0
bar) (depending on the static height of the system). Start the purging program P.00.
x
22
Perform a test operation of the boiler and heating installation, including hot water generation
and purge again if necessary.
xx
23 Perform the gas family check (¬section12.1.5). x
24 Check visually the ignition and burner performance. x x
25
Check the boiler for leaks of any kind (gas, flue gas, water, condensate) and rectify as neces-
sary.
xx
26
If you had problems with the CO, CO
2
, CO/CO
2
-values in Step 6 before the maintenance, check
them again now (¬table 12.1). If they are outside of the tolerances of ¬table 12.1 make an
adjustment, see ¬section12.1.4.
x
27 Complete the gas commission checklist (benchmark book). x x
12.3 Inspection and maintenance steps
* Additional checks and procedures will be required where the
boiler is used with a cylinder or solar thermal system. These are
not covered in this manual.
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