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6.4 F
T
ILLING AND
OPPING UP THE
S
G
YSTEM WITH
LYCOL
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
After the system has been flushed
with water it must be completely
drained of water before filling with
glycol to ensure the glycol fill is of
the correct concentration.
IMPORTANT
Tyfocor LS heat transfer fluid is pre-
mixed and must not be further
diluted.
28
To remove any contaminants the solar system must be flushed with heat
transfer fluid (glycol) or water prior to final filling. For glycol flushing and
filling see 6:2, for water flushing see 6.3.
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.
Filling and Topping Up Procedure - refer fig. 6.4A
1.
Connect fluid flow pipe to fill connection A.
2.
Remove pump group cover.
3.
Open valve B.
4.
Check non-return valve shut off is open C.
5.
Check the flow shut off valve with integral temperature guage D is
open, the red housing should be vertical (90°CW) as shown.
6.
Check the return shut off valve with integral temperature guage is
open, the blue housing E should be vertical (90°CW) as shown.
7.
Set Flow Rate to maximum F (slot vertical)- see 5.16.
8.
Close air bleed valve G.
9.
Open the air vent(s) at the system high point(s).
10. Start pumping fluid into system, fill the system slowly to encourage
air to escape.
11. Raise the system pressure to 3.5 Bar to improve air removal and to
check all connections are sound.
12. Switch off filling pump, close valve B and remove filling pipe.
13. Check air bleed valve G for air.
14. Check system for leaks.
15. Return system pressure to the required 'system fill pressure' as shown
on chart 6.5.
16. Ensure the non-return valves, flow limiter, all ball valves and other
shut off devices are returned to their correct position.
17. When all air has been evacuated from the system close the automatic
air vent and associated isolation valves.
18. Set Flow Rate at F - see 5.16.
19. Refit pump group cover.
20. Replace all thermal insulation and ensure all external and internal
pipework and fittings are suitably insulated - see 5.4.
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