Bosch Worcester Greenstar Danesmoor 12/18 Installation, Commissioning And Servicing Instruction Manual page 12

Pre-Installation
Open vent primary system (Regular only)
• The open vent pipe (F) and feed and expansion pipe (H) must rise
continuously from the appliance.
• The feed and expansion cistern (E) must be positioned to provide a
static head (S) of at least 1 metre above the highest point in the
heating system to the water level in the feed and expansion cistern.
• Ensure adequate space is left in the expansion cistern for expansion
of the system water.
• No valve shall be fitted in the open vent pipe (H) or the feed and
expansion pipe (H).
• The open vent pipe (F) must be at least 22mmØ.
Fig. 5 Regular boiler, open vent system 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.
12
Fig. 6
Fig. 7
6720808218-07.1Wo
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.
K1
Regular boiler system layout
A1
P1
K1
System boiler system layout
NOTICE: FILLING THE SYSTEM
▶ The system must not be filled with artificially
softened water.
SYSTEM FILL
Heating
return
Hose union
SV
Temporary hose
AA = Auto Air vent
CV = Check Valve
CV = Check Valve
SV = Stop Valve
SYSTEM MAKE UP
Make up
Heating
vessel
AA
return
CV
SV
Fill point
6 720 808218 (2013/10) Danesmoor Kitchen and Kitchen System
6720808218-08.1Wo
6720808218-109.1Wo
Mains
supply
CV CV
SV
Test point
1000 mm (39 in)
above the highest
point of the system.