42
To permit staging of the capacity reduction of the heat pump
at low ambient temperatures, as shown in the diagram below,
it is possible to install supplementary electric heaters in the
leaving water line. Their capacity can compensate for the
capacity drop of the heat pump.
These heaters can be controlled via an electronic card
mounted on a board (option).
Four outputs are available to control the heater contactors
(not supplied with the board), permitting gradual
compensation of the heat pump capacity reduction.
These outputs are congurable to obtain a choice of two,
three or four stages. The last stage will only be activated after
a shut-down of the heat pump following a fault con-dition
(safety device).
In the diagram below “example of additional electric heaters”
the capacity of the four heaters is the same as the capacity
of the heat pump at 7°C outdoor air temperature.
This requires only a 400 V-3 ph-50 Hz power supply source,
as well as a connection to the unit via a communication bus.
For the required conguration of the stages consult the 30RB/
RQ Touch Pilot Junior Control IOM.
1 Electric heater power supply 400 V-3 ph-50 Hz
4 Heater stage control contactors
5 Power supply for additional heaters
6 Supplementary electric resistance heaters
1 Stage 1
2 Stage 2
3 Stage 3
4 Stage 4
A Heat pump capacity variation as a function of the air temperature
B Building thermal load
Outdoor air temperature, °C
Pump capacity, %
1
A
2
3
4
B
120
100
80
60
40
20
0
-15 -10 -5 05 10 15
1
1
2
C
1
2
3
4
5
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