Supplied By www.heating spares.co Tel. 0161 620 6677
14
4000123434-2
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
Domestic
water
Heating
circuit
Return
Additional
expansion
vessel
(if required)
Hot water out
Cold supply in
Drain
point
Boiler
Filling device
3 Heating System Design
Additional
Bypass valve
(if required)
*
Control
valve
Flow
Drain
point
Bypass
valve
Heating
circuit
Return
Additional
expansion
vessel
(if required)
Boiler
Diagram 3.3
11593
10157
30ci
30si
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 30ci
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 30si
• 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
30ci 21.26 litres per minute
30si 21.26 litres per minute
This is equal to 20°C differential at maximum
heat input
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