Potterton Sirius FS 50 Installation, Operation & Maintenance Manual page 26

12.4 description oF the electrical connections to the boiler
Turn the control box downward to access terminal blocks M1 and M2 used for the electrical connections by
removing the two protective covers (see figure 10).
Terminals 1-2: connections for the optional SIEMENS QAA73 (optional extra) room temperature regulator.
These connections do not have any specific polarity.
Remove the bridge between terminals 1-2 "TA" on terminal
Read the instructions provided with the temperature regulator to ensure correct installation and program-
ming.
Terminals 3-4: room temperature thermostat "TA". Thermostats with integral accelerator resistor must not be
used. Check that there is no voltage across the ends of the two thermostat connection wires.
Terminals 5-6: external safety contact (commercially available device).
Terminals 7-8: connections for the optional SIEMENS QAC34 outdoor temperature sensor supplied with the
boiler. Read the instructions provided with the outdoor temperature sensor to ensure correct installation.
Terminals 9-10: connections for the optional domestic hot water priority sensor, for connecting single system
boilers to external DHW boilers.
cLIp-In aGu 2.511
terminals 3-4 L-n out: connection to signal lamp (230 V - 0,5 A max) for lockout alarm.
terminals 5-6 L-n out: connection to signal lamp (230 V - 0,5 A max) for run mode.
terminals X51 (1-2):
For low voltage signal lamp remove the internal wiring and feed with an external low voltage power supply.
Electronic board parameter settings
1 Hold down buttons s t on the boiler panel for at least 6 seconds until the display indicates "-----";
2 Press buttons t s +-+ in sequence: attention, this procedure accesses the "manufacturer" parame-
ters. Do not modify any parameters apart from those shown below.
3 Press button s to select the parameters in ascending order; press button t to select the parameters in
descending order. Press +/- to modify the display parameter;
The parameters to modify are h618 = 5; h623 = 50;
The changes are automatically saved when a new parameter is selected;
4 Press to save and exit the programming level.
Parameter
KonFIGeInGanr:
618
Setting for programmable clip-in input
panFoeXtechWeLLe:
Threshold of the analogue signal from which the
623
external heat demand is accepted (percentage
of the maximum value of the analogue signal)
InstructIons pertaInInG to the InstaLLer
connection to external power input 0÷10 V.
pin 1: positive power input
pin 2: negative power input
12.4.1 connecting external signal (0÷10v)
LIst oF paraMeters
Description of parameters
block M1.
Range
0 ÷ 8
5 ÷ 95
26
Default Required
setting setting
0 5
5 50
912.822.1 - GB