4.8 Additional heating, hot water
Additional heating, hot water
If one of the settings below is selected, the system can switch on the electric heater
when the compressor reaches its operating limits and switches off (or the legionella
function is active). The setting influences DHW heating only.
Freezing protection only
The electric heater will switch on only when DHW tank temperature falls below +5 °C
(freezing protection). Once the temperature in the DHW tank e10 °C, the
heater will switch 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.
● The highest setpoint for domestic hot water is lower than the setpoints for the
operating modes in which the system can use the heater.
Backup use only
The electric heater will switch on if:
1. DHW tank temperature is below +5 °C (freezing protection).
2. An alarm prevents the compressor from starting (backup operation).
In backup use, space heating has priority over domestic hot water heating. The
highest setpoint for domestic hot water is lower than the setpoints for the operating
modes in which the system can use the heater.
After compressor
The electric heater will switch on if:
1. DHW tank temperature is below +5 °C (freezing protection).
2. An alarm prevents the compressor from starting (backup operation).
3. The target temperature for the DHW tank is not reached, and the compressor
reaches its operating limits and switches off.
There is a short delay between switching off the compressor and switching on the
heater.
Select this option, if the fuse for the heat pump power supply is not to run both the
compressor and the heater at the same time.
Mode for hot
water: operating
mode selection for
domestic hot water
heating
With compressor (parallel operation)
The electric heater will switch on if:
1. DHW tank temperature is below +5 °C (freezing protection).
2. An alarm prevents the compressor from starting (backup operation).
3. The target temperature for the DHW tank is not reached, and the compressor
reaches its operating limits and switches off.
4. The target temperature for the DHW tank has not been reached, and the start
delay for the electric heater has elapsed.
There is a short delay between switching off the compressor and switching on the
heater.
Select this option, if the fuse for the heat pump power supply is rated to run both the
compressor and the heater at the same time.
4.9 Brine circuit and brine pump settings
Brine circuit
Freezing protection
limit
The minimum permissible brine circuit temperature.
● If the temperature in the brine circuit falls below this limit, the compressor will be
switched off and the unit’s electric immersion heater (if available) will provide the
necessary heating.
● Once the circuit’s temperature increases above the setpoint, the compressor will
start again.
M8006 2314EN
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