Heatrae Sadia ELECTROMAX SOLAR Installation & Servicing Instructions Manual page 41

7. Continue to fill the solar primary circuit until the system pressure reaches 0.2 MPa (2.0
bar).
At this point the pump should be vented. If the system pressure drops, repressurise as
explained above.
8. After checking that the system pressure is correct, close the fill and drain valve on the flow
meter
9. Turn on the power to the solar controller. This should display the information screen
10. Key the left button once to enter the main menu screen. The 'i' icon will flash.
11. Press the right button twice to select the manual operation menu. Press the down button
and the 'pump' symbol and the 'switch output 1' symbols should now be seen with a 'zero'
displayed. Changing the 'zero' to a 'one' will operate the pump. To do this, press the right
button and the 'zero' will flash.
12. Press either the up or down button to manually activate the pump, then key right to accept
the setting.
13. Leave the pump running for sufficient time to allow any residual air to collect in the air
separator
14. With the pump running, open the air bleed screw slowly to purge air from the system. Close
the valve when heat transfer fluid starts to flow out.
15. Allow the pump to run for a short period of time and re-open the bleed screw.
16. Repeat step 15 until all air has been purged. Use the flow meter window as a visible
indicator of the air bubbles. The reading should be stable. NOTE: During this time the
system may be checked for leaks.
17. Stop the pump using the button procedure described above.
18. The system pressure and flow rate can now be set.
4.7.4 SETTING THE SYSTEM PRESSURE AND FLOW RATE
1. It is likely that system pressure will have been lost during the air bleeding process.
2. With the filling pump still connected to the flow metre fill point, open the fill valve and pump
heat transfer fluid into the system until the system pressure reaches the level calculated
in section 4.7.1. NOTE: The system pressure should be set when the system is cold
(20°C).
3. Close the fill valve. Remove the fill and drain hoses and replace the sealing caps on the
fill and drain valves. NOTE: Take care not to spill heat transfer fluid onto the immersion
heaters below.
4. The solar controller will automatically regulate the speed of the solar circulting pump.
5. Ensure the flow meter adjustment screw is fully opened (the slot should be vertical).
6. Set the solar pump speed selector to 3. The switch to adjust the pump speed is located
on the top of the pump housing. You will need to lift the central heating expansion vessel
to gain access to the switch.
7. Manually operate the solar pump (section 4.7.3 steps 9 - 12).
8. The float in the flow meter will indicate the circulation flow rate through the flow meter
sight glass.
9. Ensure the float is stable when the pump is running.
10. Stop the pump using the button procedure described in section 4.7.3 steps 10 - 12.
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