Siemens RVS41.813 User Manual page 187

Siemens Switzerland Ltd
HVAC Products
When the compressor is started, no consideration is given to overload protection for 3
seconds.
Overload source
Takes the overload message delivered by the source pump / fan. As soon as the
contact is closed, the controller switches the heat pump off. For the heat pump to
resume operation, the minimum off time must have elapsed.
If, within the preset "Duration error repetition", "Overload source" responds several
times, the controller locks the heat pump. Operation can only be resumed by making a
reset.
Pressure switch source
Takes the signal delivered by pressure switch source. If, during source pump operation,
the contact closes for at least 3 seconds, and preselected monitoring (always or in
heating mode only) is active, and the prerun time has elapsed, the heat pump is shut
down.
On completion of "Min off time", the heat pump is switched on again. If the pressure
switch trips again within "Duration error repetition", the heat pump initiates lockout and
operation can only be resumed by making a reset.
Flow switch source
Takes the signal delivered by flow switch source. If, during source pump operation, the
contact closes for at least the preset delay time (2895), and preselected monitoring
(always or in heating mode only) is active, and the prerun time has elapsed, the heat
pump is shut down and operation can only be resumed by making a reset.
On completion of "Min off time", the heat pump is switched on again. If the flow switch
trips again within "Duration error repetition", the heat pump initiates lockout.
Flow switch consumers
Takes the signal delivered by flow switch consumers.
The flow switch is active only when the condenser pump runs and the prerun time has
elapsed. The compressor is not switched on when, on completion of the prerun time
and the preset delay time (2895), the flow switch signal is present.
On completion of "Min off time", the heat pump is switched on again. If the flow switch
trips again within "Duration error repetition", the heat pump initiates lockout. Operation
can only be resumed by making a reset.
Defrost manual
Manual defrost is triggered by activating the appropriately defined Ex input.
134: Common fault HP
Takes a common fault and sets the heat pump to the fault state.
For the heat pump to be switched on again, the common fault must disappear and "Min
off time" (2843) must have elapsed.
Fault soft starter
Takes the fault status signal delivered by an external compressor soft starter.
In the event of an active fault, the controller switches off both compressors.
When the fault status message is no longer present, the heat pump is released again.
User manual RVS61.843, RVS41.813
6 The settings in detail
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CE1U2355en_02
28. September 2009