General Parameters - Siemens RVS41.813 User Manual

General parameters

Only RVS61..
compensation heat deficit
Siemens Switzerland Ltd
HVAC Products
Line no. Operating line
2886
compensation heat deficit
Off ¦ On ¦ Only with floor curing fct
2893
Number: DHW charging attempts
2894
Delay 3-ph current error
2895
Delay flow switch
2910
Release above OT
2911
For forced buffer storage tank charging
2912
Full charging of buffer storage tank
This function compensates for excess heat and heat deficits.
These can occur in the following situations:
•
Minimum compressor on and off times
•
In the case of low temperature requests, the flow temperature can lie below the
required setpoint, but the return temperature may not drop below the switch-on
point for a longer period of time. In this situation, the heat pump must be
switched on to prevent heat deficits
The controller compares continuously the flow temperature setpoint with the actual
value and integrates excess heat and heat deficits. Differences are compensated for by
extending the compressor on and off times.
If the compressor is not switched on or off due to excess heat / heat deficits, the
controller displays an appropriate status message.
The function can only be used when control is based on the return temperature. In the
case of plants with buffer or combi storage tanks, the setting (on / off) has no impact.
"Compensation heat deficit" only acts in heating mode. The parameter is inactive in
cooling mode.
The maximum switch-off temperature is given priority over the compensation function.
In the case of sudden setpoint changes, both integrals will be deleted.
Behavior in connection with the floor curing function
When activating the floor curing function, the integral is set to a level representing 1.5
times the predefined value (default setting). If the actual temperature lies at least 2 K
below the required setpoint, the heat pump will immediately be switched on.
If compensation of excess heat / heat deficits shall act only when the floor curing
function is active, the respective setting is to be selected. This means that the
parameter is deactivated in normal heating mode.
Calculation of integral
If a flow sensor (B21) is connected and the heating curve is set to the flow temperature
setpoint, the controller uses the actual flow temperature and the flow temperature
setpoint for computing the integrals.
If sensor B21 is not present and the compressor does not operate, the temperature at
the return sensor (B71) is used and, when the compressor runs, the temperature at
B71 plus parameter "Req temp diff condenser" (2805).
If the heating curves are set to the return (BZ5810), the return temperture sensor (B71)
and the return setpoint are used for calculating the integral.
If that is not the case, the return sensor (B71) and the return temperature setpoint are
used.
User manual RVS61.843, RVS41.813
6 The settings in detail
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CE1U2355en_02
28. September 2009