Siemens RVS41.813 User Manual page 125

Locking time electric flow
Release integral
electric flow
Siemens Switzerland Ltd
HVAC Products
If the flow switch on the consumer side responds, or if the water pressure is too low, the
electric immersion heater will be switched off.
The electric immersion heater may be switched on only when the locking time after the
compressor start set here has elapsed. If there are 2 compressors, the locking time
starts to run after startup of the second compressor.
The lock out period is considered only if the electric immersion heater is used as a
"Complement to HP operation" (2880). It is not taken into consideration when using the
"Substitute" setting.
When using a 2- or 3-stage electric immersion heater, the stages are released in
accordance with the release and the reset integral (2882 and 2883).
Release integral with "Substitute" setting (2880)
After release of the electric immersion heater's first stage (K25), the controller
compares the actual temperature value with the switch-on point and generates an
integral based on the heat deficit, if there is any. As soon as the value of the integral
reaches the set maximum value (2882), the second stage is released (K25 off, K26
controls).
The controller continues to compare the actual value of the temperature with the
switch-on point and calculates again the heat deficit in the release integral.
When the release integral reaches the set value (2882), the third stage of the electric
immersion heater is released (K25 fixed on, and K26 controls).
Release integral for setting 2880 "Complementary operation, HC, DHW,
HC+DHW"
On completion of "Locking time electric flow", the controller starts calculating the heat
deficit, if there is any. The first stage of the electric immersion heater (K25) is released
only when the heat deficit has reached the level set here.
For the second and third stage of the electric immersion heater, the locking time is not
taken into consideration, but the release integral must again reach the set value.
Tw
SD TRL
2881
1
Verd1
0
1
K25
0
1
K26
0
SD TRL Switching differential return temperature
Verd1 Compressor 1
K25 Electric immersion heater relay K25
K26 Electric immersion heater relay K26
T w Temperature setpoint (switch-on point)
Tx Actual value of temperature
2881 Locking time electric flow
2882 Release integr electric flow
T Time
User manual RVS61.843, RVS41.813
6 The settings in detail
2882
2882 2882
Tx
t
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CE1U2355en_02
28. September 2009