0020308121_04 Installation and maintenance instructions 63
# Maintenance work Interval
6 Check that the condensate pipe is in good condition, that it is leak-tight
and that the drain is correct
Annually
7 Check whether all of the externally routed condensate pipes are dimen-
sioned correctly and have been insulated sufficiently (frost protection)
Annually
8 Check whether the gas flow rate corresponds with the specifications on
the data plate and lies within the tolerances specified in these instructions
Annually
9 If the gas flow rate lies outside of the tolerances specified in these in-
structions, eliminate the fault in accordance with the regulations and the
current technology
Annually
10 Check the general condition of the product and, if required, eliminate any
faults that are found
Annually
11 Checking the control electrode using the O
2
content Annually
12 Carry out the combustion analysis: Measure the CO content, O₂ content
and the CO/O₂ ratio.
Annually
13 Check the product's recirculation at the supply air test point on the air/flue
pipe. If required, inspect the entire air/flue system and, if necessary, cor-
rect the fault
Annually
14 Disconnect the product from the electrical installation Annually
15 Check and, if required, correct the electrical installation Annually
16 Removing dirt from the product and the vacuum chamber Annually
17 Visually checking the condition of the heat cell, checking for corrosion,
rust or damage
Annually
18 Check that the gas isolator cock and service valves function correctly Annually
19 Check the quality of the heating water: Clarity (clouding), correct inhibitor
and pH value
Annually
20 Removing the compact thermal module At regular intervals
46
21 Check the burner for damage At regular intervals
22 Replacing the control electrode If required, at least every
5 years or 20,000 operating
hours (whichever comes first) 59
23 Checking the insulating mats in the combustion area and replacing dam-
aged insulating mats
At regular intervals
24 Cleaning the heat exchanger At regular intervals
48
25 Cleaning the condensate siphon Annually
49
26 Filling the condensate siphon Annually
37
27 Installing the compact thermal module At regular intervals
47
28 Checking and, if required, supplementing the pre-charge pressure for the
internal expansion vessel
At regular intervals
49
29 Checking the pre-charge pressure in the shift-load cylinder expansion
vessel
Annually
30 Cleaning the strainer in the cold water inlet At regular intervals
50
31 Check the impeller sensor for dirt/damage At regular intervals
32 If the water volume is insufficient (domestic hot water) or the outlet tem-
perature is insufficient, check the secondary heat exchanger
At regular intervals
33 Reassemble the product After each time maintenance
work is carried out
34 Opening the service valves Annually
35 Filling the heating installation At regular intervals
36
36 Run the test operation on the product/heating installation including hot
water generation (if available) and, if required, purge the product/heating
installation
Annually
37 Cleaning the protection kit, if available Annually
38 Completing inspection and maintenance work Annually
50
39 Re-checking the O₂ content (the air ratio) If required, at least every
2 years
40 Check the product for gas, flue gas, water and condensate leaks Annually
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