Domestic Hot Water System Design - Saunier Duval Themaclassic F24E PLUS Instructions For Use Installation And Servicing

1
Bypass fully shut
2
Open 1/4 turn
3
Open 1/2 turn
4
Open 1 turn
5
Open 2 turns
Additional
expansion
vessel
(if required)
* Bypass
(If required)
• Copper tubing or plastic Hep
hot water system. Unecessary pressure losses should be
avoided.
• Provision shall be made for a drain valve at the lowest points
of the system.
• The flow restrictor must be fitted limiting the flow through the
boiler to a maximum of 12 l/min (F30E Plus)
10 l/min (F24E Plus).
4000121771-2
3 Heating System Design
(10 kPa = 1 m WG)
Boiler
Domestic
Filling device
water
*
Bypass
Drain
valve
point
Control
'A'
valve
Drain
point
Heating
circuit
Diagram 3.2

4 Domestic Hot Water System Design

0 may be used for the domestic
2
the product manufacturers for specific details.
3.1 Bypass
•The boiler is fitted with an adjustable automatic bypass.
TABLE 1. FLOW RATE
Model Minimum flow rate
F 24 E plus ?
F 30 E plus 21.26 litres per minute
This is equal to 20°C differential at maximum heat input
Ensure that under no circumstances does the flow rate drop
below the figure specified, see Table 1.
• A bypass is not required on the central heating circuit unless
the system controls could allow the boiler to operate when
there is no flow.
• Where a bypass has to be fitted, the bypass must be placed
at least 1.5 metres from the appliance, see diagram 3.2.
3.2 Filling the system
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 3.2.
• The boiler will operate with a minimum supply pressure of 0,5
bar, at reduced flow rate.
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.
12
Diagram 3.1