Siemens RVS41.813 User Manual page 151

Switching differential Off
Lock time
Siemens Switzerland Ltd
HVAC Products
Through generation of the temperature-time integral, it is not only the period of time that
is considered, but
the extent of the deviation also. This means that when the crossing is significant, the
supplementary source is released earlier, or locked earlier, than with minor crossings.
TVxSch
TVwSch
Int
-
K27
K32
TVx Actual value of the flow temperature
TVw Flow temperature setpoint
+ Int Excess integral
- Int Deficit integral
t1, t2 Overrun time
K27 Release output K27
K32 Control K32
If the common flow temperature exceeds the flow temperature setpoint by the amount
of the switch-off differential, switching off takes place immediately, independent of the
switching integral of the supplementary source (K32), and the request for heat (K27) is
aborted on completion of the overrun time.
The locking time enables the heat pump to reach a stable operating state before the
supplementary source is allowed to switch on.
The supplementary source is released only when the locking time has elapsed. The
locking time starts as soon as a valid flow temperature setpoint is available. Calculation
of the release integral starts only when the locking time has elapsed.
TVwSch
TVxSch
t
A
K27
TVxSch Actual value of the common flow temperature
TVwSch Setpoint of the common flow temperature
A Request
K27 Release output K27
No consideration is given to the locking time, if the heat pump malfunctions or is locked,
or if the supplementary source must end DHW charging.
The function can be deactivated.
User manual RVS61.843, RVS41.813
6 The settings in detail
+ Int
t1 t2
CE1U2355en_02
28. September 2009
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