Vaillant ecoTEC plus 618 Spécifications télécharger pdf (Page 40)

40 Instructions for installation and servicing ecoTEC

7.4 Checking the expansion vessel

Fig. 7.10 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 expan-

sion 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 previ-

ously detailed.

• Check gas rate as previously detailed.

• Check for water leaks.

• Refit case, ensuring that a good seal is obtained.

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 system for leaks, check its fas-

tening

• 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.

Fig. 7.11 Function check

8 Troubleshooting

8.1 Logical fault finding procedure

These checks must be carried out before attempting to

use the fault finding guide.

1. Carry out electrical safety checks (see section

‘Preliminary Electrical Checks’).

2. Check that the external electricity supply to the boiler

is on, and a supply of 230 V~ is present between boiler

terminals ‘L’ and ‘N’.

3. Check that the gas supply to the boiler is on, that it

has been correctly purged and that an inlet pressure

of 20 mbar is available at the gas valve. (See section

‘Gas Supply’).

4. Ensure the heating system is full of water and charged

to between 1 and 1.5 bar. If not, refill and vent the sys-

tem. (See section ‘Filling the heating system’). Ensure

boiler flow and return service valves are open.

5. Check that the main on/off control is set to the ‘on’

position.

6. Set the central heating temperature to maximum.

7. Set the domestic hot water temperature to maximum

(combination boilers only).

8. Check that all external controls are on and calling for

heat (if no external controls are fitted, boiler terminals

3 and 4 must be linked). Check that the boiler anti–

cycling economiser is not engaged.

7 Inspection and maintenance

8 Troubleshooting

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