Vaillant ecoTEC plus VUI Series Installation And Maintenance Instructions Manual page 63

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