Description Of The Sensor Terminal Block; Filling The Installation; Filling The Heating System - Potterton SIRIUS THREE FS 70 Installation Manual

Caution
All connections are made to the terminal blocks provided for that purpose in the boiler connection box. The output
available per outlet is 180 W (1 A, with cos ϕ = 0.8) and the inrush current must be less that 5 A. If the load
exceeds either of these values, the control must be relayed using a contactor that must not be installed in the
control panel under any circumstances.
The sum of the currents from all outlets must not exceed 4 A.
Fig.62
1 Auxiliary sensor 1 - BX3: flow sensor + cascade
return connection
2 Auxiliary sensor 2 - BX2: heating circuits collector
flow sensor connection
3 Outside sensor
7.8

Filling the installation

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1 3
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1
7.7.5

Description of the sensor terminal block

4
5
3 2 1
1
4 Domestic hot water sensor
5 Room temperature sensor 1
6 Room temperature sensor 2
7 Room temperature sensor 3
8 Boiler pump modulation (PWM)
7.8.1

Filling the heating system

Before filling the heating system, rinse it thoroughly.
In many cases, the heating circuits can be filled with mains water, without
treating the water.
1. Fill the heating system until you reach a pressure of between 0.15 and
0.2 MPa (1.5 and 2 bar).
2. Check the tightness of the hydraulic connections.
3. Completely vent the heating circuit for optimum running.
For more information, see
Water treatment, page 27
Flushing new installations and installations less than 6 months
old
Before filling the heating installation, it is essential to remove any debris
(copper, caulking, soldering flux) from the installation.
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7 Installation
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