Manual Worcester-Bosch Greenstar Danesmoor Utility Regular - Utility System (page 14 of 64) (English)

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Pre-Installation

Greenstar Danesmoor Utility 2022+ and Utility System 2022+ - 6 721 846 263 (2022/01)14

Fig. 9 Regular boiler, open vent layout

[A] Regular appliance

[A1] System appliance

[B] Expansion vessel*

[C] Automatic bypass valve

[D] Drain cock

[E] Feed and expansion cistern

[F] Open vent 22mmØ min.

[G] Pressure gauge*

[H] Feed and expansion 15mmØ min.

[J] Circulating pump*

[K] Zone valves

[K1] Three port valve

[L] Lockshield valve

[M] Hot water cylinder

[N] Automatic air vent

[P] Pressure relief valve*

[P1] Pressure relief discharge*

[R] Radiators

[T] Thermostatic radiator valve TRV

[U] To filling system

[NOTE] * Components included in the System boiler

Fully pumped sealed primary system:

• A pressure relief valve (P), spring loaded safety valve set to operate

at 3bar, must be fitted to the heating flow pipe as close as possible to

the boiler or onto one of the boiler top 1” BSP outlets.

• An expansion vessel (B) must be fitted to the heating return pipe as

close as possible to the boiler and pressurised for the system volume

according to the instructions supplied with the vessel.

• A pressure gauge (G), 3 bar minimum, must be fitted to the heating

flow pipe or one of the boiler 1” BSP outlets.

• An automatic air vent (N) must be fitted.

Fig. 10 Regular boiler, system layout

Fig. 11 System boiler system layout

Filling primary sealed systems

• Where the system volume is more than 180 litres at 0.5 bar or

exceeds 2.65 bar at maximum heating temperature an extra

expansion vessel (B) must be fitted as close as possible to the

appliance in the central heating return.

• Pressurise the extra expansion vessel (B) to the same figure as the

expansion vessel built into the appliance (system boilers).

• Filling the system must comply with one of the methods shown in the

figure below.

• The filling point must be at low level and must never be a permanent

connection to the mains water supply.

• Filling loops must be WRAS approved.

Fig. 12

[SV] Stop valve

[CV] Check valve

6720808218-07.1Wo

NOTICE: FILLING THE SYSTEM

▶ The system must not be filled with salt based

softened water.

6720808218-08.1Wo

6720808218-109.1Wo

SYSTEM FILL

SV SV

Test point

Temporary hose

Hose union CV

Heating

return

Mains

supply

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Worcester-Bosch Greenstar Danesmoor Utility Regular - Utility System Manual

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