Electrical Connection; Filling And Flushing The Solar Thermal System; Filling The System - Grundfos Solar 15-80 130 Installation And Operation Instruction Manual

9. Electrical connection

The electrical connection should be carried out by an authorised electrician in accordance with local
regulations.
Warning
The pump must be connected to earth
The pump must be connected to an external mains switch with a minimum contact gap of 3mm
in all poles
Before removing the terminal box cover, make sure that the power supply has been switched
off and that it cannot be accidently switched on.
The motor required no external motor protection.
•
Check that the supply voltage and frequency correspond to the values stated on the
•
pump.
Connect the pump to the mains with the 2m cable supplied with the pump.
•
The user is to consider whether it is necessary to install an emergency stop switch.

10. Filling and flushing the solar thermal system

Warning
The system should not be filled or drained during periods of strong sunshine as
The pumped liquid may be scalding hot and under high pressure!
It is recommended only to use water & glycol solution (50% max) as solar fluid to fill and flush
the solar thermal system.

10.1 Filling the system

1. Ensure the monobloc ball valves (blue & red) are completely open (turning in the anti-clockwise
direction).
2. Connect the hose/pipe to the filling connections on the flow regulator.
3. Connect the hose/pipe to the discharge connection on the flow regulator.
4. Position the valve in the centre of the flow meter in the fill in/flush direction (see 8. Flow meter).
5. Open the fill and discharge ball valve on the flow regulator (see 8. Flow meter).
6. Flush the solar thermal system continuously, until fluid comes out of the discharge connection, for
approximately 15 minutes to remove air from the system.
7. Also during flushing, bleed the system by opening the vent screw on the air-separator (see 7. Air-
separator).
8. Close the valve on the discharge connection and allow the pressure to rise until the desired pressure
is reached.
9. Close the valve on the filling connection.
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