Technical data

13
4000123924-2
TEMPORARY
CONNECTION
HOSE
UNION
HOSE
UNION
SUPPLY
PIPE
CONTROL
VALVE
CONTROL
VALVE
DOUBLE
CHECK
VALVE
BOILER
RETURNFLOW
HEATING
CIRCUIT
DRAIN
POINT
SUPPLY
PIPE
AIR GAP
TUNDISH
CONTROL
VALVE
CONTROL
VALVE
TYPE CA BACKFLOW
PREVENTION DEVICE
BOILER
RETURNFLOW
HEATING
CIRCUIT
DRAIN
POINT
Method 1
Method 2
Control
valve
Flow
Drain
point
Bypass
valve
D
omestic
water
Heating
circuit
Return
Additiona
l
expansion
vessel
(if require
d)
Hot water out
Cold supply in
Drain
point
Boiler
Filling device
3 Heating System Design
Additional
Bypass valve
(if required)
*
Control
valve
Flow
D
rain
p
oint
Bypass
valve
Heating
circuit
Return
Additiona
l
expansion
vessel
(if require
d)
Boiler
Diagram 3.3
11593
10157
F30E - F35E
F30E SB
9898
*
'A'
Additional
Bypass valve
(if required)
*
*
'A'
Diagram 3.2
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.
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 21.26 litres per minute
F30E SB 21.26 litres per minute
F35E 24,98 litres per minute
This is equal to 20°C differential at maximum
heat input