PRE-INSTALLATION
6 720 821 670 (2018/06) 15
SYSTEM FILL
Fig. 3 System fill/System make-up
S AND Y PLAN SYSTEMS:
SYSTEM LAYOUTS EXAMPLES:
S PLAN LAYOUT - OPEN VENT
Fig. 4 S plan open vent
Y PLAN LAYOUT - OPEN VENT
Fig. 5 Y plan open vent
NOTICE: Bypass considerations
▶ Appliances fitted with a modulating pump may not
require a system bypass.
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 9 Key to figures 4, 5, 6, 7 & 8
NOTICE: A drain cock should be fitted at the lowest
point of the heating circuit and beneath the appliance.
SYSTEM FILL
CV = Check Valve
SV = Stop Valve
SV SV
Test point
Temporary hose
Hose union
CV
CV
Heating
return
Mains
supply
SYSTEM MAKE UP
AA = Auto Air vent
CV = Check Valve
SV
CV
AA
Make up
vessel
Heating
return
1000 mm (39 in)
above the highest
point of the system.
6720644743-08.2Wo
S PLAN LAYOUT
8
7
1
3
2
4
6
5
150 mm
max
M
M
reset max
6720644744-03.1Wo
Y PLAN LAYOUT
8
7
1
3
2
4
5
150 mm
max
reset max
M
6720644744-04.1Wo
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