4.3 Additional heating, space heating
Device settings → Service → Heating → Additional heating
An electric immersion heater (in-line heater) provides heating in the same way as the compressor and
uses the same setpoint values. The heater switches on and off (and transitions between higher and lower
power stages) with a delay.
Start delay with
compressor
The electric heater’s start delay in space heating. Once the delay has elapsed, the
first power stage will switch on.
●
Typical setting: 120–600
● Increase the delay to move forward the point at which the heater is switched on
(and starts to supplement the compressor).
The delay is based on degree minutes, and it applies when the compressor
is running and the flow temperature is below its setpoint. Once the measured
temperature is above the setpoint, the delay will be reset.
● Delay calculation: flow setpoint – measured flow temperature.
● The following power stages are governed by the
Power increase delay
.
Power increase
delay
Whe the first power stage is activated, the
Power increase delay
takes effect. After
the delay, the next power stage will switch on.
●
Typical setting: 40–120
● Increase the delay to move forward the point at which the next power stages will
be switched on to provide supplementary heating (for the compressor and the
first stage).
The delay is based on degree minutes, and it applies when the compressor is
running, the electric heater’s first power stage is active, and the flow temperature is
below its setpoint. Once the measured temperature is above the setpoint, the delay
will be reset.
● Delay calculation: flow setpoint – measured flow temperature.
Power decrease
delay
The stages are switched off one by one, with the Power decrease delay in between.
The stage that was switched on last will be switched off first.
●
Typical setting: 0–2
● Decrease the delay to have the power stages switch off earlier after the flow
temperature exceeds its setpoint.
● If the delay is greater than 0, the heater power stages will remain switched on
even after the flow temperature has exceeded the setpoint.
● For a more stable flow temperature, use a setting slightly above zero.
The delay is based on degree minutes, and it applies when the compressor is
running, the electric heater is active, and the flow temperature is above its setpoint.
Once the measured temperature is below the setpoint, the delay will be reset.
● Delay calculation: flow setpoint – measured flow temperature.
Mode for heating:
operating mode
selection for space
heating
Freezing protection only
The electric heater will be switched on only when heating water temperature falls
below +5 °C. The freezing protection function monitors the temperature in the
condenser, buffer tank, and the heating circuits. Once the temperature exceeds
+10 °C, the electric heater will be switched off. In freezing protection, space heating
has priority over domestic hot water heating.
●
If this option is selected, the electric heater won’t be switched on during a
fault unless the temperature falls below the Freezing protection limit.
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