Worcester GREENSTAR 30CDi Installation, Commissioning And Servicing Instructions page 9

S AND Y PLAN SYSTEM:
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 4 Key to figures 6, 7, 8 & 9
NOTICE: A drain cock should be fitted at the lowest
point of the heating circuit and beneath the appliance.
SYSTEM LAYOUT:
S PLAN LAYOUT
3
2
150 mm
max
5
6
Fig. 5 S plan
Y PLAN LAYOUT
3
2
150 mm
max
4
M
5
Fig. 6 Y plan
6 720 806 548 (2013/02)
S PLAN LAYOUT
1
7
4
M
6720648547-40.1Wo
Y PLAN LAYOUT
1
7
6720648547-41.1Wo
SEALED SYSTEM LAYOUT
12
MCW
10
Fig. 7 Sealed system
NEW BUILD SYSTEM LAYOUTS
The latest Part L1a regulation for new installations require separate zone
controls for the central heating.
Open vent with two heat zones
3
2
150 mm
max
5
8
6
Fig. 8 Open vent with two heating zones
Sealed system with two heat zones
5
8
12
6
MCW
10
Fig. 9 Sealed system with two heating zones
PRE-INSTALLATION
SEALED SYSTEM LAYOUT
7
4
M
5
11
6720648547-42.1Wo
9
OPEN VENT LAYOUT
1
7
4
6720648547-27.1Wo
SEALED SYSTEM LAYOUT
7
4
11
6720648547-28.1Wo
9
8
8
8
9