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Example 3: operation in series - control on water
outlet for a combination of units
1
Key
Master unit
1
Slave unit
2
Electrical boxes for Master and Slave units
Water inlet
Water outlet
Water pumps for each unit (included in units with hydraulic module)
Additional sensors for the control of the leaving water temperature to be
T
connected on channel 1 of the slave boards of each Master and Slave unit
CCN communication bus
Connection of two additional sensors
Non-return valve
7.7 - Auxiliary electric 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 auxiliary electric heaters on the unit's water outlet.
These heaters (not supplied) can be controlled via option 156.
Four outputs are available to control the switches (not supplied) on the auxiliary electric heaters, allowing 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.
34
Example of additional electric heaters
120
100
1
80
2
1
2
60
2
3
4
40
20
0
-15
-10
-5
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
A
1
C
B
0
5
10
15
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