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- The two heating (item no. 2) and d.h.w. (item
no. 1) potentiometers of the LGMs become inac-
tive.
- The Summer/Winter potentiometer (item no. 3) of
the LGMs remains active and must always be in
the Winter position:
• Summer/Winter switching is automatically car-
ried out by the RVA regulators and the LGMs.
. if the average outdoor temperature is lower
than 19 °C (Average temperature calculated
by the regulator and visible in parameter
e
of the RVA 47), the boiler ensures the
heating and d.h.w. functions,
. if the average outdoor temperature is above
19 °C, the boiler only ensures the d.h.w.
function (the heating function is automatical-
ly halted).
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The master LGM differs from the slave LGM. The
master LGM receives the temperature setting from
the RVA 47 and converts it into power. If this power
reaches 75 % of a 50 kW module’s maximum pow-
er, the second module is selected and both modules
set themselves at 50 % of the requested power.
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- Check d.h.w. operation by creating a domestic
hot water request via the regulator or the LGMs
and check the correct operation of the pumps or
selector valves and the storage temperature.
- Check the LGM selection operation by creating a
heating request via the RVA 47 or the QAA 70
room sensor.
- Check the LGM deselection operation by reduc-
ing the heating request.
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The slave LGM is selected as late as possible and
is deselected as late as possible. This equates to
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3
2
1
3
2
1
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75%
37,5%
37,5%
75%
100%
75%
100%
50%
25%
OFF
25%
25%
)LJ
= Power increase
= Power reduction
= Selection
= Deselection
