Room Sensor (Accessory) Qaa55; Room Unit (Accessory) Qaa75; External Heating Circulation Pump / Pump For Heating Circuit 2 (Accessory); Heating Control Group 2 (Accessory) - Gebwell Qi Series Installation, Operation And Maintenance Manual

control unit and the sensor head. The sensor is equipped
with a 15m cable.
The outdoor temperature sensor is already wired to the
control centre. Position the sensor in a shaded location on
the north or north-east wall. Do not place the sensor near
windows or doors.
7.5

Room sensor (accessory) QAA55

For connection refer to the electrical diagram and the
instructions delivered with the room sensor.
The room sensor is connected to the connector X152,
BSB/M of the control centre.
7.6

Room unit (accessory) QAA75

Room unit QAA74.611 functions as a user interface for
the heat pump. The QAA unit is connected to connector
X86, BSB/M/G+ on the control centre. The room unit
contains an inbuilt room temperature sensor.
7.7 External heating circulation pump /
pump for heating circuit 2 (accessory)
External heating circulation pump (X9) is equipped with
a plug connector, and F4 line protection. Once the plug
(X9) is connected to the designated point on the control
centre, the pump is ready for operation. The pump can be
started from the line protection switch F4. The pump is
not connected to the heat pump's control system.
24
7.8

Heating control group 2 (accessory)

Mixing valve (X1) for heating circuit 2 and flow sensor
B12 (X2) are equipped with a connector. Heating circuit
2 must be commissioned in controller's menu. In
commissioning of the heating circuit 2, site-specific
setting should be taken into account.
7.9

Electric heater (SV1) power

As factory delivery, the output of the ground source heat
pump's electric heater is 6 kW at maximum. The
controller switches the resistors on and off in 2 phases
depending on the power required. If the resistor power
needs to be increased, the resistor control method must be
changed to 3-phase control.. The heat pump's fuse size
must be selected according to the power of the electrical
resistor. The correct fuse size is listed in the device's
technical table.
Resistor phase 1: 3 kW (K25)
Resistor phase 2: 6 kW (K26)
Resistor phase 3: 9 kW (K25+K26)
If the resistor power must be increased to 3-phase, see
instructions in the manual, section "Heat pump settings >
Settings for the electric resistor (SV1)".
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