Cleaning and treating an existing central heating system using quality products from Fernox.

1. Cleaning and treating an existing central
heating system – Silver Clean
Procedure
1. Identify and rectify mechanical faults. 11. Repeat step 10 on all radiators.
2. Dump system water to a foul drain and refill 12. Use a Fernox TDS Meter to ensure that the
with fresh plain water. Install a Fernox TF1 total dissolved solids have been satisfactorily
Total Filter or TF1 Compact. removed. The system can be regarded as
3. Add Fernox Cleaner F3 or Cleaner F5 at being thoroughly flushed when the system
the recommended dose through a radiator, water value is within 10% of the mains water.
the TF1 or filling loop. Differences over 10% mean that significant
cleaner residues have been left in the system
4. Turn on the boiler and circulate the Cleaner F3 and further flushing is required.
for a minimum of one hour.
13. Add Fernox Protector F1 500ml or Express
5. Turn off the boiler and close the flow valve to at the recommended dose.
the TF1. Remove the TF1 magnet and open
the drain valve. Drain contents into a suitable 14. efit the magnet assembly in the TF1 Filter.
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container until the water runs clearer. Close the 15. he retreatment sticker provided with all
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drain valve, open the flow valve and re-insert Fernox Protectors should be correctly
the TF1 magnet. Switch on the boiler. completed and applied to the boiler casing.
6. Isolate all radiators by closing the wheel-head Note: For continual protection Fernox
valves or TRVs except that furthest away from recommend Protector levels are checked
the boiler. Circulate the cleaner through the annually (usually during the service) or
radiator for five minutes or until efficiency is sooner if the system content is drained down.
restored. Check using a ‘touch test’. If the This should be carried out using a Fernox
radiator remains cold at the bottom in the Protector Test Kit.
centre, rolling a Fernox MaxMag upwards
from the bottom of the radiator can help to If you are unsure of dose rates or require further
dislodge any persistent sludge in the base. advice, contact Fernox Technical Services on
Close the flow to the radiator. +44 (0)870 870 0362 or visit www.fernox.com
7. Repeat step 5.
NB: Motorised valves should be manually opened
8. Repeat steps 6 and 7 for all radiators in during the flushing process and any anti-gravity
the system. valves should be by-passed or removed
9. Turn off the boiler, remove the magnet from the temporarily. If it is necessary to cap off the open
TF1 and open all radiators. Purge the system vent during the mains flush to prevent overflow
water to drain whilst at the same time introduce ensure the cap is removed prior to restarting
fresh water via the feed and expansion cistern the appliance.
or via the filling loop. Flush through until the
water runs clear.
10. solate all radiators except that furthest away
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from the boiler, and continue to purge for
five minutes.
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