24
6.2 F
LUSHING AND
F
ILLING THE
S
YSTEM USING GLYCOL
To remove any contaminants, the solar system has to be flushed with heat
transfer fluid or water prior to final filling, for water flush see 6:3.
Flushing and filling with glycol is done using a suitable electric pump or
hand pump which should be able to provide pressure up to 3.5 bar.
Flushing Procedure using glycol - refer fig. 6.2A
1.
Carry out the pre-fill check - see 6.1.
2.
Remove pump group cover.
3.
Connect fluid flow pipe to fill connection A.
4.
Connect return flushing pipe to connection B.
5.
Open valves C then D.
6.
Open non-return valve shut off E.
7.
Check the flow shut off valve with integral temperature guage F is
open, the red housing should be vertical (90°CW) as shown.
8.
Check the return shut off valve with integral temperature guage G is
open, the blue housing should be vertical (90°CW) as shown.
9.
Set Flow Rate to maximum H (slot vertical) - see 5.16.
10. Close air bleed valve J.
11. Open the air vent(s) at the system high point(s).
12. Start pumping fluid through the system. As the pumped fluid will
take the route of less resistance it will flow through the pump and
then return to the container.
13. After a short period close the ball valve G by turning the blue
thermometer housing (CCW). This will divert the flow in the normal
direction of the system.
14. When flushing is complete close valve C (flush return). The system
will now start to fill. Fill the system slowly to encourage air to escape.
15. Raise the system pressure to 3.5 Bar to improve air removal and to
check all connections are sound.
16. Switch off filling pump, close valve D and remove filling pipe.
17. Check air bleed valve J for air.
18. Check system for leaks.
19. Return system pressure to the required ‘system fill pressure’ as
shown on chart 6.5.
20. Ensure the non-return valves, flow limiter, all ball valves and other
shut off devices are returned to their correct position.
21. When all air has been evacuated from the system close the automatic
air vent and associated isolation valves.
22. Set Flow Rate at H to 1l/min - see 5.16.
23. Refit pump group cover.
24. Replace all thermal insulation and ensure all external and internal
pipework and fittings are suitably insulated - see 5.4.
IMPORTANT
The indirect cylinder MUST be fully
filled before filling the solar circuit.
Failure to do so may result in
irreparable damage to the cylinder.
IMPORTANT
Tyfocor LS heat transfer fluid is pre-
mixed and must not be further
diluted.