3.6
Auxiliary heating
If the heat demand is greater than the heat pump’s compressor capacity, the immersion heater engages auto-
matically in operating mode AUTO. The electrical heater is made up of an electric heating element on the sup-
ply line that has two outputs, AUX. HEAT 1 and AUX. HEAT 2, and can be controlled in three steps. Atria
Optimum
has
three outputs, AUX. HEAT 1, AUX. HEAT 2 and AUX. HEAT 3 and output can be controlled in five steps.
Diplomat, Diplomat Duo, Comfort
Atria
Optimum
230V
400V
230V
400V
Step 1
1.5
3
1.5
3
Step 2
3
6
3
6
Step 3
4.5
9
4.5
9
Step 4
12
Step 5
15
Step +4
12
Step +5
15
Tab. 1: Immersion heater output in kW
The two power steps, step 4 and step 5 for Atria
Optimum
cannot be activated when the compressor is running.
Immersion heater step: +4 and +5 can be connected when the compressor is running and must only be selected on
the condition that the building where the heat pump is installed has a large heating demand and the building’s
electric installation is suitable for high current consumption. In the event of an alarm, the immersion heater
engages automatically on the condition that operating mode AUTO is selected and that at least one additional
step is permitted.
User Guide
Domestic heat pumps
VUGFD202
Thermia Värmepumpar
10
