Vaillant ecoTEC plus 937 Service Manual download pdf (Page 52)

52 Installation and maintenance instructions ecoTEC plus 937 0020031552_06

8.1.5 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

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 instruc-

tions.

2 Carry out a general inspection of the boiler for dirt and dust and clean as necessary. x x

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.

Measure the gas flow rate during operation with maximum load (section 5.9.2). If the gas flow

rate complies to the Table 5.1 continue with column 1, if not proceed to column 2.

Check the gas inlet working pressure (section 5.9.3) operation with maximum load. If the gas

inlet working pressure complies to the Table 5.2 continue with column 1, if not proceed to col-

umn 2.

Check combustion by measuring CO, CO

and CO/CO

. If the values are outside the

tole rances of Table 7.1 proceed to maintenance column 2. You must not proceed with the

maintenance if a new burner door seal kit is not available.

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.

8 Close the gas isolation valve and the service valves. x

Dump the pressure in the boiler on the water side (observe pressure gauge) and check the

charge pressure of the expansion vessel of the boiler. Top up if necessary.

Check the charge pressure of the expansion vessel of the shift load storage tank. If required,

correct the pressure.

11 Remove the compact thermal module. x

Check the integrity of all combustion circuit seals, especially the burner door seal. If there are

any damages repair them before proceeding.

13 Clean the heat exchanger. 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 if necessary. x x

16 Check the condensate ducts in the boiler and clean if necessary. x x

17 Install the compact thermal module. Caution: Use new seals and nuts! x

Open the service valves and fill up the boiler/appliance to approximately 1.0 - 2.0 bar

(depending on the static height of the system). Start the bleeding program P.0.

Open the gas isolation valve, reconnect the boiler with the power mains and switch on the

boiler.

Perform a test operation of the boiler and heating installation, including water heating and

bleed again if necessary.

21 Check visually the ignition and burner performance. x x

Check the boiler for leaks of any kind (gas, flue gas, water, condensate) and rectify as neces-

sary.

If you had problems with the CO, CO

, CO/CO

-values in Step 6 before the maintenance, check

them again now (see Table 7.1). If they are outside of the tolerances of Table 7.1 make an

adjustment, see section 7.1.4.

24 Complete the gas commission checklist (benchmark book). x x

Table 8.2 Inspection and maintenance steps

8 Inspection and maintenance

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 79 80

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Vaillant ecoTEC plus 937 Service Manual Page 52

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