8 - WATER CONNECTIONS
8.6 - Auxiliary electrical heaters
To compensate for the reduction in the heat pump's output at low ambient temperatures, which changes significantly as shown in
the graph below, it is possible to install on the water outlet auxiliary electrical heaters of sufficient power to offset the heat pump
capacity drop.
These heaters can be controlled via the dedicated option.
Four outputs are available to control the contactors (not supplied on the plate) on the heaters, thereby enabling gradual compensation
of the heat pump output reduction.
These outputs are configurable to allow for two, three or four stages as required. The last stage is only activated in case of shut-
down due to a fault on the heat pump (emergency).
In the graph below, the power of the four heaters equals the capacity of the heat pump at an outdoor air temperature of 7°C.
Example of additional electric heaters
Outdoor temperature (°C)
Pump output (%)
Operating range for which the heat pump output is less than the building thermal load
Operating range for which the heat pump output is greater than the building thermal load
1
Stage 1
2
Stage 2
3
Stage 3
4
Stage 4 (safety)
A
Variation of the heat pump output with air temperature
B
Building thermal load
C
Point of equilibrium between the heat pump output and the building thermal load
EN-35
AQUACIAT
POWER
ILD
