gledhill TORRENT DIRECT Design, Installation & Servicing Instructions page 31

HEATING SYSTEM DESIGN
Torrent Direct
Maximum
height : 6m
3
1
Flow
Return
1 ; Boiler pump
2 : Central heating pump
3 : Store thermostat
Boiler
Figure 4.3 Torrent Indirect OV: Typical open vented heating system using twin pump control arrangement
Highest point
Must comply with the
of system
Boiler manufacturers
250mm minimum
minimum head
requirements
1
2
1
Flow
Boiler
Return
Figure 4.4 Torrent Indirect OV: Boiler with dipped fl ow and return ans 'S' plan heating system controls
250mm minimum
Feed and vent pipes
must be fitted
by the installer
2
7
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1 : Auto air vent
2 : Pressure relief valve
3 : Automatic bypass valve
4 : Heating zone valve
5 : System pump
6 : Hot water zone valve
7 : Store thermostat
1
4
Heating flow
5
6
3
Heating return