Vaillant ecoMAX 646 Service Manual download pdf (Page 22)

fig. 31

GW 610/0

5. Commissioning

5.1 Preliminary electrical checks

Check the electrical installation by

carrying out short circuit, earth

continuity and resistance to earth tests

and a check for correct polarity.

5.2 Gas supply

The complete gas installation

including the gas meter must be

inspected, tested for soundness and

purged in accordance with BS 6891.

The gas supply to the boiler can be

purged by slackening the gas service

valve beneath the boiler (1, fig. 31).

Ensure that there is adequate

ventilation, extinguish naked flames

and do not smoke whilst purging.

After purging, the gas service valve

connection must be re-tightened and

tested for soundness.

(The boiler itself does not require

purging as this will be done by the

automatic burner sequence control).

5.3 Water supply

Open all domestic hot water taps

supplied by the boiler, turn on the

mains water supply to the boiler and

open the mains water isolating valve

below the boiler (2, fig. 31).

Water will now flow through the

boiler to the hot taps. Starting with the

lowest tap supplied, turn the hot taps

off one at a time until the hot water

pipework is purged of air.

Check all hot and cold pipework for

leaks.

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Vaillant ecoMAX 646 Service Manual Page 22