User manual

Page 15
Always install isolating valves, so the boiler can be isolated from the heating system, when
needed. Make sure that the safety valve is mounted between the boiler and the isolation valves.
The pressure relief valve/ safety valve must always be installed in such a way that it cannot be
isolated from the boiler by a valve. The specifications and size of the safety valve should be
determined by the installer and must comply with all applicable regulations and boiler capacity.
By-pass
The boiler has no internal bypass. For UK low loss headers must be used. See page 19
The boiler flow will also be influenced when any pipe of the heating system is frozen / blocked.
Make sure all heating pipes are free from the risk of frost by using adequate controls and
insulation.
Pump functionality
The internal ON/OFF pump has a speed regulator, which is adjusted to the highest setting: Do
not change this setting! The boiler has an internal pump switch that has a programmable delay
before it turns off (also for hot water supply this delay is programmable).
The pump starts running in case of a heat demand. When heat demand stops, the pump will
continue to run for a programmed time period and after it will stop. The internal pump and (when
installed) the three-way valve or hot water pump for the calorifier can be activated every 24 hours
(for a programmable time period). This 24-hour cycle starts as soon as the power supply of the
boiler is connected.
Frost protection
The boiler has built-in frost protection, that is automatically activating the central heating pump (if
wired to the Boiler if not other frost protection is required) when the boiler return (water)
temperature drops below the 5°C (programmable). When the boiler return temperature drops
below the 3°C (programmable), the burner is also ignited. The pump and/or burner will shut down
as soon as the return temperature has reached the 10°C (programmable) this function protects
the Boiler. The stated temperatures are related to the temperatures measured by the RETURN
sensor of the boiler. This frost protection function will not fire up the boiler in case of a “general
blocking” of the burner
REMINDER: This “Frost Protection” function is only useable for the boiler and not for the whole
central heating system. A boiler or system damaged by frost is not covered under warranty.
Installing a strainer and/or dirt separator
Always install a strainer (water filter) and/or a dirt separator in the return pipe system side of the
low loss header in such a way that the water going to the boiler is free of any debris/particles.
When using a water strainer always check a week after installation to determine the strainer
cleaning interval. Mount valves before and after the strainer, including an air bleed valve, so the
strainer can be isolated from the heating circuit for service operations. Clean water is very
important, blocked and/or polluted heat exchangers, including failures and/or damages caused
by this blockage are not covered by the warranty. On old or very dirty systems consider the
hydraulics as shown in pages 23 & 24
All lines/piping must be mounted free of tension. The weight of all the installation com-
ponents should be supported separately from the boiler so there will be no standing
force on the connections.
This could influence the mounting position of the boiler.