Supplementary Electric Resistance Heaters - Carrier AQUASNAP 30RQ Installation, Operation And Maintenance Instructions

30RQ with configuration: leaving water control
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1 Master unit
2 Slave unit
Control boxes of the master and slave units
Water inlet
Water outlet
Water pumps for each unit (included as standard for units with hydronic
module)
Additional sensors for leaving water control, to be connected to channel
1 of the slave boards of each master and slave unit
CCN communication bus
Connection of two additional sensors

8.6 - supplementary electric resistance heaters

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 (accessory).
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 configurable 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 condition (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 configuration of the stages consult the 30RB/
RQ Pro-Dialog Plus Control IOM.
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1 Electric heater power supply 400 V-3 ph-50 Hz
2 Accessory control board for four additional electric heaters
3 Internal communication bus
4 Heater stage control contactors
5 Power supply for additional heaters
6 Supplementary electric resistance heaters
Typical accessory installation diagram
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