Saunier Duval Themaclassic F30E SB Instructions For Use Installation And Servicing page 13

3.1 Bypass
•The boiler is fitted with an adjustable automatic bypass.
Ensure that under no circumstances does the flow rate drop
below the figure specified, see Table 1.
• A system bypass is not required on the central heating circuit
unless the system controls will not ensure a minimum water
flow rate.
• Where a bypass has to be fitted, the bypass must be place
at least 1.5 metres away from the appliance, see diagram 3.1.
3.2 Filling the system F30E-F35E
A filling device is fitted to the boiler to initially fill the system
and replace water lost during servicing, see the relevant
parts of diagram 2 controls and lighting and diagram 3.1.
Boiler
Domestic
Filling device
water
Bypass
Drain
valve
point
Control
'A'
valve
Drain
point
Heating
circuit
F30E - F35E
Boiler
Bypass
valve
*
Control
'A'
valve
Drain
point
Heating
circuit
F30E SB
3 Heating System Design
Additional
expansion
vessel
(if required)
* Additional
Bypass valve
*
(if required)
Additional
expansion
vessel
(if required)
Additional
*
Bypass valve
(if required)
Diagram 3.2
3.3 Filling the system F30E SB
• Provision for filling the system must be made. The methods
are shown in diagram 3.2. There must be no permanent
connection to the mains water supply, even through a non-
return valve.
Note: It is important that fittings used for connection to
potable water comply with the water undertakings
requirements.
TABLE 1. FLOW RATE
Model Minimum flow rate
F30E
F30E SB
F35E
This is equal to 20°C differential at maximum
heat input
BOILER
FLOW RETURN
HEATING
CONTROL
CIRCUIT
DRAIN
POINT
Method 1
BOILER
FLOW RETURN
CONTROL
VALVE
HEATING
CIRCUIT
DRAIN
POINT
Method 2
13
21.26 litres per minute
21.26 litres per minute
24,98 litres per minute
SUPPLY
PIPE
CONTROL
VALVE
DOUBLE
CHECK
VALVE
HOSE
UNION
TEMPORARY
HOSE
CONNECTION
VALVE UNION
TYPE CA BACKFLOW
PREVENTION DEVICE
CONTROL
VALVE
AIR GAP
TUNDISH
Diagram 3.3
4000123924-2
SUPPLY
PIPE