Potterton Sirius FS 50 Installation, Operation & Maintenance Manual page 27

Boiler heating performance according to the voltage on the connector (with voltage above 5V).
NB: Demand active = 10
Demand inactive = 0
12.5 connecting the qaa73 rooM teMperature regulator
The SIEMENS model QAA73 room temperature regulator, if required (optional accessory) must be connected
to terminals 1-2 of terminal block M2 in figure 12.
The link across terminals 3-4, provided for connection of a room temperature thermostat, must be removed.
The settings of the domestic hot water temperature and domestic hot water production schedule must be made
using this device.
The timed program of the central heating circuit must be set on the QAA73 if there is a single zone, or in relation
to the zone controlled by the QAA73 device.
The timed program for the central heating circuit of the other zones can be set directly on the boiler control
panel.
See the instructions provided with the QAA73 temperature regulator for the user parameter programming
procedure.
QAA73: parameters which can be set by the installer (service)
By pressing the two PROG buttons together for at least three seconds it is possible to access the list of para-
meters that the installer can display and/or set.
Press either of these buttons to change the parameter to display or change.
Press the [+] or [-] key to change the value displayed.
Press either of the PROG buttons again to save the change.
Press the information button (i) to quit programming.
Here follows a list of the most commonly used parameters:
InstructIons pertaInInG to the InstaLLer
Voltage (VDc)
27
912.822.1 - GB