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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
If there is no control sensor (B21, B10, B71), the electric immersion heater is locked
when controlling to the return temperature sensor and can only be activated via
emergency operation.
Substitute and complement to heat pump operation
In the following cases, setting “Use electric flow” has no impact on the use of the
electric immersion heater:
• With frost protection
• With air-to-water heat pumps during the defrost process
• During active limitation due to too low source temperature (see “Time limit source
temp min” for water-to-water heat pumps (2822))
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 locking time 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 with setting “Complement HP operation“ (2880)
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.
Locking time electric flow
Release integral
electric flow
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