Overview Of The Maintenance Tasks; Functional Check Of Boiler Operation; Servicing The Compact Thermal Module; Dismantling The Compact Thermal Module - Vaillant ecoTEC PLUS SERIES Installation And Maintenance Manual

7 Inspection and maintenance

7.1.4 Overview of the maintenance tasks

No. Activity
Disconnect the device from the mains supply, close the gas supply and maintenance taps, depressurise the
1
device (observe the manometer)
2 Dismantle compact thermal module
3 Clean integral condensation heat
4 Check whether the burner is dirty
5 Install compact thermal module. Caution: Replace gasket! (ET 981 046)
For 800 series appliances:
6 Dismantle, decalcify and re-assemble the hot water heat exchanger (for this connect cold water inlet valve
to appliance)
For 800 series appliances:
7 Dismantle aqua-sensor, clean filter in the cold water inlet of the sensor and reinstall sensor (for this con-
nect cold water inlet valve to appliance)
Check whether the electrical plug connections and other connections are fitted tightly and make adjust-
8
ments, if necessary.
9 Check the primary pressure at the expansion tank and adjust it, if necessary.
Open the maintenance taps, fill up the appliance/system up to approx. 1.0 - 2.0 bar (depending on the static
10
height of the system)
11 Check appliance generally, check for dust on the applianceand remove in the low-pressure chamber
12 Check the condensation water siphon in the device and clean it and fill it, if necessary.
13 Clean the condensation waterways in the device
14 Open the gas supply and switch on the device
Perform a test operation of the appliance and heating system, including water heating and evacuate, if
15
necessary
16 Check ignition and burning performance
17 Check whether the device is leaking flue gas, water or condensation water
18 Check the air/flue gas system for leaks, check its fastening and make adjustments, if necessary
19 Check appliance gas setting, reset and record if necessary.
20 Keep a log of the inspection/maintenance carried out
Table 7.1 Maintenance steps

7.1.5 Functional check of boiler operation

• Carry out a functional check of the boiler operation as
previously detailed.
• Remove the appliance casing as detailed and operate
the boiler.
• Inspect the burner operation through the viewing win-
dow.
• Check that the flames are evenly covering the surface
of the burner.
• Inspect for signs of excessive flame lift or sooting.
7.2

Servicing the compact thermal module

7.2.1 Dismantling the compact thermal module

The compact thermal module consists of a speed-con-
trolled fan, combined gas/air fittings, the gas supply
(mixer tube) for the fan of the pre-mixing burner and the
pre-mixing burner itself. These four components make
up the complete assembly, the compact thermal module.
Danger!
Danger of explosion through gas leakage!
The mixer tube between the gas control unit
and burner must not be opened. It can only be
guaranteed that this component is gas-proof
after it has been checked at the factory.
40
Danger!
There is danger of being injured or scalded at
the compact thermal module and at all compo-
nents carrying water. Only carry out work on
these components once they have cooled down.
Proceed as follows to remove it:
• Turn off the boiler
• Isolate the electrical supply to the boiler.
• Remove boiler bottom cover by releasing the two
spring retaining lugs and lowering the rear of the bot-
tom cover.
• Gently pull the bottom cover backwards to remove
from the appliance.
• Turn off the gas service valve.
• Turn off the boiler CH service valves.
• Loosen screw, release the front case spring retaining
clips located beneath the front edge of the appliance.
• Remove the front casing by easing forward the bottom
edge and gently lifting.
• Lower electronic control box.
carry out for:
inspection
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