SP-MAN-INSTALL-01
Revision 2 21-12-21
10.0
Sealed System Installation
The EOGB Sapphire boiler is suitable for use with sealed systems complying with the requirements of BS 5449. The maximum temperature
of the central heating water is 75°C. The system must also be provided with the following item
(Not supplied with the boiler)
• Diaphragm expansion vessel complying with BS 4814.
• Pressure gauge.
• A
3 Bar
Pressure Relief Valve.
• Approved method for filling the system.
Ensure that the expansion vessel used is of sufficient size for the system volume. Refer to The Domestic Heating Design Guide for sizing the
required vessel.
The air pressure in the vessel must be checked annually.
The air charge pressure may be checked using a tyre pressure gauge on the expansion vessel Schrader valve. The vessel may be re-pres-
surised using a suitable supply of Nitrogen gas, When checking the air pressure the water in the heating system must be cold and the
system pressure reduced to zero.
10.1
Heating System Design Considerations
To achieve the maximum efficiency possible from the EOGB Sapphire boiler, the new heating systems should be designed to the following
parameters:
Radiators:-
•
Flow temperature 70°C
•
Return temperature 50°C
•
Differential 20°C
Underfloor
•
Flow temperature 50°C
•
Return temperature 40°C
•
Differential 10°C
For additional guidance please refer to the Domestic Heating Design Guide published by CIBSE.
10.2
Before you fill the system
To avoid the danger of dirt and foreign matter entering the boiler the complete heating system
MUST
be thoroughly flushed, cleaned and
treated out - before the boiler is connected and then again after the system has been heated and is still hot. This is especially important
where the boiler is to be connected to an old system.
For optimum performance after installation, this boiler and its associated heating system must be flushed in accordance with the guide-
lines given in BS 7593 “Treatment of water in domestic hot water central heating systems”.
Failure to implement these guidelines will invalidate the warranty.
10.3
Magnetic Filtration
EOGB requires that at the time of installing this appliance to also install a effective magnetic filter on the return pipework after the last
radiator on the heating system. This will maintain maximum operational efficiency and provide protection from damaging long-term
effects of “Magnetite” (Black Iron Sludge). It is essential that the filter is sized similar to the return pipework (i.e. 22mm (¾”)).
In all circumstances, an effective magnetic filter must be installed in accordance to the manufacturer’s instruction
Failure to implement these guidelines will invalidate the warranty.
22
WARNING
WARNING
Sealed Systems
WARNING
