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Siemens Building Technologies
Basic Documentation LMU54... / LMU64...
CC1P7494en
HVAC Products
3 Functions
07.11.2002
Parameterization to be made by the installer
Configuration byte for setting the control strategy of the modulating pump. For the
∆
T
supervision, only Bits 0 through 5 are relevant.
Heating circuit pump or maximum limitation of the flow temperature (first stage).
XXXX XXX0
: Multispeed pump is activated; the following Bits 1 through 5 have no
meaning
XXXX XXX1
: Modulating pump is activated and thus maximum limitation of the flow
temperature also
∆
T limitation (second stage)
XXXX XX0X
:
∆
T limitation is inactive
XXXX XX1X
:
∆
T limitation is active; maximum limitation of the flow temperature
remains active also
∆
T supervision (third stage)
XXXX X0XX
:
∆
T supervision is inactive
XXXX X1XX
:
∆
T supervision is active; maximum limitation of the flow temperature
remains active also
∆
T supervision in reduced operation
XX0X XXXX
: The activated stage of
∆
T supervision is inactive in reduced operation
In reduced operation, the pump will then generally operate at the minimum speed
«NqmodMin». When running at minimum speed in reduced operation, the house might
cool down excessively if poorly insulated.
In the case of better insulated houses, this function is an additional savings function in
terms of electric pumping power, since the pump runs at a lower speed, thus saving
electrical energy.
XX1X XXXX
: In reduced operation (night setback), the selected
∆
T supervision is
active, depending on the activated stage
Not relevant for
∆
T supervision.
Activation of PWM pump
via a configuration byte
Bit 0
Bit 1
Bit 2
Bit 5
Bit 6 and Bit 7
