Technical data

17
2000225294A
Diagram 3.3
FILLING LOOP
12211
TAP (a)
EXTENSION
TAP (b)
EXTENSION
Diagram 3.4
12253
3 Heating System Design
4 (F24e & F28e ONLY) Domestic Hot Water System Design
All domestic hot water circuits, connections, fittings must be in
accordance with the relevant standards and water supply
regulations.
For GB: Refer to the current addition of the Water Regulations
Guide.
For IE: The current edition of I.S.813 "Domestic Gas Installations".
- Copper tubing or plastic Hep
2
0 may be used for the domestic
hot water system. Unnecessary pressure losses should be
avoided.
- Provision shall be made for a drain valve at the lowest point of
the system.
- The boiler will operate with a supply pressure of 0,6 bar, but
under reduced flow rate. In these circumstances the filling loop
will not pressurise the boiler.
Best operating comfort will be obtained from a supply pressure
of 1 bar.
4.1 Hard Water Areas
In areas where the water is 'hard', more than 200mg/litre, it is
recommended that a proprietary scale reducer is fitted in the
cold water supply to the boiler.
(F24e & F28e ONLY)
Control
valve
Flow
Drain
point
Bypass
(if required)
Heating
circuit
Return
Additional
expansion
vessel
(if required)
Boiler
'A'
Diagram 3.2a
10157
TYPE CA