Slant/Fin VHG-100-CH, Installation And Service Manual

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E93.1901EN032 Installation and Service Manual SlantFin VGH-CH / CO
Frost protection
The boiler has a built-in frost protection that automatically activates the boiler circulator when the boiler return
(water) temperature drops below 50 °F/ 10 °C (programmable). When the boiler return temperature drops below
the 41 °F/ 5 °C (programmable), the boiler is also ignited. The circulator and/or boiler will shut down as soon as
the return temperature has reached the 59 °F/ 15 °C (programmable). The mentioned 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 boiler demand.
Installing a strainer and/or
dirt separator
Always install a Y strainer and/or a dirt
separator in the return pipe of the boiler; in
such a way that the water going to the boiler
is free of any debris/particles. When using a Y
strainer always check a week after installation
to determine the strainer cleaning interval.
Advice is to mount valves before and after the
strainer, including an air bleed valve, thus
isolating the strainer 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. In existing systems
when replacing a cast iron boiler or when
installing in a system with cast iron radiators
or cast-iron piping, a magnetic dirt separator
must be installed.
See Figure 7.12
It is advised to place pressure measuring
gauges before and after the strainer. Clean
the strainer (water filter) when the maximum
delta P exceeds the value prescribed by the
strainer manufacturer.
This “Frost Protection” function is only useable for the boiler and not for the whole central
heating system. Because it concerns a programmable setting, a boiler damaged by frost is
not covered under warranty.
Figure 7.12
NOTICE