Heatrae Sadia ELECTROMAX SOLAR Installation & Servicing Instructions Manual page 35

4.3 COMMISSIONING – CENTRAL HEATING PRIMARY SYSTEM
4.3.1 FILLING THE SEALED SYSTEM PRIMARY CIRCUIT
FIGURE21: CENTRAL HEATING COMMISIONING
AUTOMATIC
BYPASS VALVE
CENTRAL HEATING
FLOW CHECK VALVE
CENTRAL HEATING
RETURN CHECK VALVE
1. Ensure all power supplies are switched off.
2. Ensure the domestic hot water system has been commissioned (see section 4.2 page 34)
and the mains water supply is on.
3. Check the central heating filling loop is connected and connections are tight.
4. Check the central heating expansion vessel charge pressure is set to 0.1 MPa (1bar) and
modify if necessary. Pressure is checked using a car tyre pressure gauge. The valve is
located at the opposite end of the water connection.
5. Open all radiator valves, and the central heating flow and return check valves.
6. Flush the central heating primary system in accordance with BS 7593 and the manufac-
turer's instructions supplied with the flushing agent selected.
7. Add Inhibitor to the central heating primary system.
8. To fill the primary circuit open the central heating filling loop isolating valves and allow
primary system to fill until the central heating pressure gauge on the Electromax Solar
control panel reads 0.2 Mpa (2.0 bar)
9. Purge air from all radiators and air vent points in the central heating system.
10. Check the central heating system pressure. This should be between 0.1 MPa and 0.15
MPa (1.0 and 1.5 bar). If lower, open the filling loop isolating valves until gauge reads 0.2
MPa (2.0 bar). Repeat air purging operation. This sequence may need to be repeated
several times to ensure all air is purged from the system.
CENTRAL HEATING
FILLING LOOP
FILING LOOP
ISOLATION VALVES
DOMESTIC COLD
WATER INLET
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