Bosch WORCESTER GREENSTAR Ri ErP Series Installation, Commissioning And Servicing Instructions page 12

PRE-INSTALLATION
SEALED PRIMARY SYSTEM:
NOTICE: Artificially softened water must not be used to
fill the central heating system.
• The CH sealed system must be filled using a WRAS approved filling
loop or comply with figure 2 for system fill.
• An expansion vessel, of a size suitable for the system, must be fitted
as close as possible to the appliance in the central heating return.
• Also fit a pressure gauge, a 3 bar pressure relief valve and stop cock
(fixed cylinder type or sealed system approved connection).
• Do not use galvanised pipes or radiators.
SYSTEM FILL
SYSTEM FILL
Heating
return
Hose union
SV
Temporary hose
CV = Check Valve
SV = Stop Valve
SYSTEM MAKE UP
Heating
AA
return
SV
Fig. 2 System fill/System make-up
S AND Y PLAN SYSTEMS:
NOTICE: Bypass
▶ Generally a bypass is not necessary on a Y plan system
as one of the ports is open to flow.
1 Static head -
Minimum static head 250mm measured from the highest
point in the heating system (top surface of the appliance or
the highest point in the heating system) to the water level in
the feed and expansion tank
2 Heating vent (22mm minimum)
3 Primary cold feed (15mm minimum)
4 Diverter/Zone valve
5 Pump, maximum power 90 Watts
6 Automatic bypass
7 Radiator valve (Flow)
8 Lock shield valve (Return)
9 Expansion vessel
10 Pressure gauge
11 3 bar pressure relief valve
12 Stop cock
Table 8 Key to figures 3, 4 & 5
NOTICE: A drain cock should be fitted at the lowest
point of the heating circuit and beneath the appliance.
12
Mains
supply
CV CV
SV
Test point
AA = Auto Air vent
CV = Check Valve
Make up
vessel
CV
1000 mm (39 in)
above the highest
point of the system.
FULLY PUMPED SEALED SYSTEM:
The central heating sealed system must be filled using a WRAS approved
filling loop or comply with figure 2 for System fill.
S PLAN LAYOUT
3
2
150 mm
max
5
reset max
6
Fig. 3 S plan
Y PLAN LAYOUT
3
2
150 mm
max
4
M
5
reset max
Fig. 4 Y plan
SEALED SYSTEM Y PLAN LAYOUT
4
M
5
reset max
12
MCW
11
10
9
Fig. 5 Sealed system
Greenstar Ri
1
7
4
M
6720644744-03.1Wo
1
7
6720644744-04.1Wo
7
6720644744-05.1Wo
ErP - 6 720 813 283 (2016/07)
8
8
8