Checking The Expansion Vessel; Recommissioning The Boiler; Test Operation - Vaillant ecoTEC SERIES Instructions For Installation And Servicing

7 Inspection and maintenance
• Clean the siphon part section by rinsing it out with
water.
• Fill the lower part with water until about 10 mm below
the upper edge.
• Fasten the lower part again on the condensate siphon.
7.4

Checking the expansion vessel

Fig. 7.11 Checking expansion vessel admission pressure
Note
It is not necessary to perform this check every
year – a check every three years is sufficient.
• Ensure the boiler CH service valves are closed.
• Release the pressure from the boiler.
• Remove valve cap from expansion vessel charge point.
• Check that the internal charge pressure of the
expansion vessel is between 0.75 and 0.9 bar.
If the pressure is lower than this the vessel should be
repressurised using an air pump.
• Refit the valve cap.
• Repressurise boiler and heating system.
7.5

Recommissioning the boiler

• Carry out electrical safety checks.
• Turn on the electrical supply.
• Open the boiler CH service valves.
• Carry out function checks of boiler operation as
previously detailed.
• Check gas flow rate as previously detailed.
• Check for water leaks.
• Refit case, ensuring that a good seal is obtained.
48
7.6

Test operation

Always perform the following checks after completing
any maintenance task:
• Commission the appliance according to the relevant
operating manual.
• Check the appliance for gas and water leaks.
• Check the air/flue gas installation for leaks, check its
fastening.
• Check for ignition and an even flame on the burner.
• Check that the heating system and the water heating
is working (combination boilers only).
• Fill out the Benchmark gas boiler commissioning
checklist at the rear of this guide.
1
Fig. 7.12 Function check
Instructions for installation and servicing ecoTEC 839592_12