Electric Immersion Heater In The Flow - Siemens Albatros2 User Manual
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Electric immersion heater in the flow
Use electric flow
Siemens Switzerland Ltd
HVAC Products
Relays K25 and K26 are intended for using an electric immersion heater in the flow.
They are controlled by 2 appropriately configured multifunctional relay outputs QX1 –
QX6.
If both relays are present, the electric immersion heater is controlled in 3 stages (1st
stage K25, 2nd stage K26, and 3rd stage K25 and K26).
If a flow temperature sensor (B21) is connected, it is used for control to the flow
temperature setpoint. The switching differential is 1 °C.
If the flow temperature sensor is missing, but a common flow temperature sensor (B10)
is available, that sensor is used for conrol.
If no flow temperature sensor is present, the electric immersion heater is controlled
based on the return temperature (B71) and the return temperature setpoint. The
switching differential is set with parameter "Switching diff return temp" (2840).
Line no.
Operating line
2880
Use electric flow
2881
Locking time electric flow
2882
Release integr electric flow
2883
Reset integr electric flow
2884
Release el flow below OT
Control of the electric immersion heater is dependent on the selected kind of use.
Substitute
The electric immersion heater is only used in emergency operation (7141 and 7142).
When activating emergency operation (manually or automatically), the electric
immersion heater is immediately released to ensure control to the current setpoint. No
consideration is given to "Locking time electric flow" (2881) and to "Release electric
flow below OT" (2884).
If there is no control sensor (B21, B10, B71), the electric immersion heater is switched
on in emergency operation when there is a valid temperature request. In the case of a
3-stage electric immersion heater, both stages (K25 and K26) are switched on at the
same time.
Control of the electric immersion heater must take place by an external thermostat.
With DHW charging: If the heat pump is not capable of completing DHW charging, the
electric immersion heater is not switched on and DHW charging will be aborted.
Complement to heat pump operation
With this setting, the electric immersion heater is used as described under "Substitute",
and in cases where the heat pump is not capable of satisfying the demand for heat.
In the case of DHW charging, the electric immersion heater is locked, however, except
when the compressor had to be switched off due to the maximum switch-off
temperature, high-pressure or hot-gas problems. In these cases, the electric immersion
heater is released for DHW charging when the maximum permissible number of
charging attempts (2893) has been reached.
With DHW charging: If the heat pump is not capable of completing DHW charging, it will
be completed by the electric immersion heater. In that case, the current DHW charging
temperature is saved when switching to the electric immersion heater occurs.
When making the diagnostics, the saved temperature appears as "Curr DHW charg
temp HP" (7093).
User manual RVS61.843
6 The settings in detail
111/221
CE1U2355en_02
23. November 2007
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