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
NOTICE: FILLING THE SYSTEM
▶ The system must not be filled with salt based
softened water.
6720808218-08.1Wo
K1
SYSTEM FILL
SV SV
Test point
Temporary hose
Hose union
CV
CV
Heating
return
Mains
supply
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