0 system details – Baxi Potterton Gold HE A Range User Manual

Page 14

6.0 System Details

6.8

Domestic Hot Water Circuit (Fig. 7)

1. All DHW circuits, connections, fittings, etc. should be fully

in accordance with relevant standards and water supply

regulations.

2. Your attention is drawn to:

for GB: Guidance G17 to G24 and recommendation R17 to

R24 of the Water Regulations Guide.

for IE: the current edition of I.S. 813 “Domestic Gas

Installations”.

3. A single check valve must be fitted as shown in Fig. 7 to

prevent backflow to the supply pipe and to ensure the

efficient operation of the expansion vessel which is required

to accommodate the thermal expansion of the water.

4. When the domestic water system includes any device

which prevents water expanding back towards the supply

(check valve, loose jumpered stopcock, water meter, water

treatment device) then an expansion vessel must be fitted

(eg. Zilmet 160ml, R

15bar).

5. If the hot water expansion is not provided for, then high

pressures can develop which may result in damage to fittings

and devices on the system.

6. The boiler’s maximum working mains pressure is 8 bar,

therefore all pipework, connections, fittings, etc. should be

suitable for pressures in excess of 8 bar. A pressure reducing

valve must be fitted for pressures in excess of 8 bar. The

manufacturer of any outlet fittings, such as a shower valve,

may require a lower maximum pressure. The pressure

reduction must take account of all fittings connected to the

DHW system.

6.9

Showers

1. If a shower control is supplied from the appliance it

should be of the thermostatic or pressure balanced type.

Thermostatic type shower valves provide the best comfort

and guard against water at too high a temperature. Existing

controls may not be suitable - refer to the shower valve

manufacturer.

6.10

Hard Water Areas

1. If the area of the installation is recognised as a HARD

WATER AREA then a suitable device should be fitted to

treat the mains water supply to the boiler. Contact your

Water Distribution Company for advice on suitable devices.

Boiler

Other Tap
Outlets

Expansion
Vessel

To Hot
Taps

Check
Valve

Pressure Reducer
Valve

Stop Tap

Fig. 7