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

1. Cleaning and treating an existing central
heating system – Gold Clean
Equipment needed
• Fernox Powerflow Flushing Machine MKIII the Powerflushing Filter regularly. During this
• Fernox Powerflushing Filter time, check each radiator is emitting heat
• Fernox Protector F1 correctly with a ‘touch test’. If the radiator
remains cold at the bottom in the centre,
• Fernox Cleaner F3
rolling the Fernox MaxMag upwards from the
• Fernox MaxMag bottom of the radiator can help to dislodge any
persistent sludge in the base. Turn off the boiler.
1. Turn off all electrical controls and electrically
11. lose off the flow to all of the radiator valves
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isolate the system.
except one by closing the wheel-head valve
2. Fully open all wheel-head valves and TRVs or TRV. Allow the unit to pump through this
to ensure maximum flow through the valve. radiator and out to drain for two to five minutes
(Note the setting of each valve, so that the whilst maintaining the water level by adding
system can be re-instated after flushing.) fresh water to the tank. Reverse the flow during
this time.
3. Set diverter or zone valves to manual.
12. lose the flow on the radiator and then move
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4. Anti-gravity valves (non-return valves) if fitted
to the next radiator. Open the valves and repeat
should be bridged, by-passed or temporarily
radiator flush. Continue until all of the radiators
removed.
have been individually flushed. Open up the
5. open-vented systems, cap-off or temporarily
For valves on all radiators and dynamically flush for
join together the open-vent and cold-feed to the a further ten minutes or until the difference in
filling and expansion tank. TDS measurements between the mains and
6. Connect the Powerflushing Machine MKIII the drain agree to within 10%.
to the heating system using either a Powerflow 13. lose the mains water supply and switch off
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Pump Head Adapter or a TF1 Flushing the Powerflushing Machine MKIII. Close
Adapter. Connect the Powerflushing Filter the system circulator isolation valves and
on the return to the Powerflushing Machine disconnect the Powerflushing Machine
MKIII. MKIII and Powerflushing Filter from the
7. Open the flow and return valves and allow heating system.
the unit to run for ten minutes with the system 14. rain down the system as necessary and install
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operational and all radiator valves open. a filter from the Fernox TF1 range and protect
Reverse the flow and check and clean the by adding Fernox Protector F1 either via a
Powerflushing Filter regularly. radiator, the TF1 or filling loop.
8. the water remains dirty, dump the dirty water
If
to drain whilst adding clean water to the Re-commissioning the system
reservoir tank until the water appears clearer. Re-connect the system circulator and restore
9. Add Fernox Cleaner F3 or Cleaner F5 to the the electrical supply. Remove any temporary
Powerflushing Machine MKIII via the chemical connections or caps and reset the valves to their
addition port. operational positions.
10. llow the unit to run for a minimum of one hour
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reversing the flow and checking and cleaning
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