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Siemens Building Technologies
Basic Documentation RVL471
CE1P2524E
HVAC Products
22 Function block "Multi-functional relay"
23.10.2002
With plant types that do not have their own heating circuit (4–x, 5–x, and 6–x), the set-
ting "Occupancy or non-occupancy time according to the heating program" makes no
sense, since these types of plant have no heating program. In that case, the multifunc-
tional relay is always de-energized.
22.2.3
ON / OFF according to the time switch
The multifunctional relay is energized and deenergized according to the time switch
entered on operating line 146.
With the plant types that do not have their own heating circuit ( 4–x, 5–x, and 6–x), the
setting "According to the heating program" makes no sense, since these types of plant
have no heating program. In that case, the multifunctional relay is always de-energized.
22.2.4
Relay energized in the event of fault
If, at the RVL471, a fault status message is present, either from the controller itself or
from the data bus (LCD displays
ERROR
), the multifunctional relay will be energized.
Switching on takes place with a delay of two minutes. When the fault is corrected, that
is, when the fault status is no longer present, the relay will be de-energized with no
delay.
22.2.5
Relay energized during occupancy time
If the own heating circuit is maintained at operational level
– independent of the
operating mode – the multifunctional relay is energized. In operating mode
, no
consideration is given to optimum start / stop control.
With the plant types that do not have their own heating circuit (4–x, 5–x, and 6–x), the
setting "Relay energized during occupancy time" makes no sense. In that case, the
multifunctional relay is always de-energized.
22.2.6
Relay energized during occupancy time (including op-
timizations)
If the own heating circuit is maintained at operational level
– independent of the
operating mode – the multi-functional relay is energized (LCD displays
). In operat-
ing mode
, consideration is given to optimum start / stop control.
With the plant types that do not have their own heating circuit (4–x, 5–x, and 6–x), the
setting "Relay energized during occupancy time" makes no sense. In that case, the
multifunctional relay is always de-energized.
22.2.7
Relay energized, if there is demand for heat
If the own heating circuit or the d.h.w. circuit calls for heat, the multi-functional relay will
be energized. In interconnected plants, the relay is energized when the controller re-
ceives a demand for heat.
22.2.8
Manually ON / OFF
On operating line 142, the multifunctional relay can be manually energized and de-ener-
gized with the setting buttons.
Press button
Effect
Multifunctional relay will be energized
Multifunctional relay will be de-energized