Vaillant ecoMAX 646 Service Manual download pdf (Page 11)

11

fig. 6

GW 400/0

3.7.2 Filling and make up

The system should be filled with water

via a separate filling point fitted at a

convenient position on the heating

circuit. Where local Water Authority

Regulation allows, a temporary

connection to the mains may be used

(fig. 6). The connection must be

removed when filling is completed.

Where local Water Authority

Regulation does not allow temporary

connection, a sealed system filler

pump with break tank must be used.

The heating system will not be filled

automatically from the domestic hot

water side.

(Alternative methods of filling sealed

systems are given in BS 5449).

3.7.3 Pressure relief valve

A pressure relief valve is provided

ready assembled within the boiler

(5, fig. 7). This safety device is

required on all sealed C.H. systems

and is pre-set at 3 bar and provided

with a 3/4 in. BSP connection for a

discharge pipe, which must be of no

less than 15mm diameter.

3.7.4 Pressure and temperature gauge

This is factory fitted to the boiler and

indicates the primary circuit pressure

to facilitate filling and testing, as well

as showing the temperature of the

central heating system water.

Heating

circuit

return

Double check

valve assembly

Stop

valve

Test

valve

Hose

unions

Mains

water

supply

Temporary

Hose

fig. 7

GW 609/0

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