this stage is the chemical added so that it can then work
specifically to disturb, loosen and dissolve more stubborn
accumulations of debris.The chemical can then work
specifically to disturb, loosen, and dissolve more stubborn
accumulations of debris.
Either remove the tank filler cap or leave it loosely on the tank
neck if there is some splashing whilst flushing.
Set both valves in the closed position.
Plug the pump into a power supply and switch supply on.
The flow reverser lever has
two positions, LEFT, and
RIGHT.
If the lever is to the left, water
will flow into the heating
system through the left hand
side hose, and water will
return to the tank along the
right hand hose. Pushing the
lever to the right reverses the
direction of flow and return.
The exact direction of flow is not of any great importance until
you wish to ‘dump’ the system water.
Switch the pump on and make sure that the water level in the
tank remains at least 10 cm above the minimum mark, adding
more water if necessary.
Check all hoses and connections for leaks, and repair before
continuing.
Run the pump for ten minutes, reversing the direction of flow
regularly by moving the lever from left to right, and vice versa.
When ‘dumping’,
the water level
in the tank will
fall as dirty
water is diverted
down the drain,
and does not
return into the
pump tank.
Switch the pump
on and operate
the correct
dump valve
depending upon
the direction of
flow. If the flow
reverser lever
is to the left, twist the right-hand dump valve through 180
o
to show the word ‘dump’, ensuring that the left-hand valve
remains in the ‘circulation’ position.
If the flow reverser lever is to the right, twist the left-hand dump
valve through 180
o
to show the word ‘dump’, ensuring that the
right-hand valve remains in the ‘circulation’ position.
Open the orange water inlet valve and adjust to allow fresh
water to enter the tank at the same rate as water is exiting the
dump hose. Make sure that the tank water level remains at
least 10 cm above the minimum mark, and continue dumping
until the waste water runs relatively clear.
Turn the valve which is in ‘dump’ mode through 180
o
to restore
full circulation through the pump and the system. Close the
water supply inlet valve once the water level in the tank has
stabilised between minimum and maximum marks.
Bleed all radiators to expel any air.
This stage is carried out once the initial brief circulation and
discharge of the worst of the debris has been carried out.
Switch the pump on so that water is re-circulating through the
heating system. Remove the tank filler cap and carefully pour
either PowerFlush FX2 or Hyper-Flush liquid into the tank.
Keep the pump running for 15 minutes, regularly reversing the
direction of flow.
With the Clearflow pump still running, close all radiator valves
to enable the cylinder coil (if present) to be thoroughly flushed,
reversing the flow regularly.
Next close any diverter / zone valves to direct the flow through
the heating circuit, in preparation to flush each radiator.
Starting on the ground floor radiators, fully open both radiator
valves on the nearest radiator. Alternatively, start with the worst
radiator first, so that the strongest concentration of chemical is
directed at the worst areas of the system.
Flush the radiator, reversing the flow regularly until it is cleared.
Once cleared close both valves and move to the next radiator.
Open both radiator valves, and repeat the procedure.
Work through the remaining radiators in turn, until every
radiator in the system has been flushed individually.
Having flushed each radiator individually, then closed their
valves, set the pump into dumping mode. With only the last
radiator valves open, operate the pump until the water leaving
the dump hose is completely clear. Reverse the direction
of flow and the isolating / dump valves accordingly so that
dumping is performed in both directions.
Once the dumped water from both directions is clear, close
both radiator valves.
Repeat this process on each individual radiator until all have
been cleared.
If the system has a hot water cylinder, open the diverter valve
and flush the coil, dumping in both directions.
Finally, flush the boiler, dumping in both directions.
If you have used PowerFlush FX2 flushing liquid, which is
acidic, it must be neutralised to prevent long term corrosion.
Set the Clearflow pump to normal recirculation mode then
open all radiator and diverter valves. With the pump running,
add 100gm of Neutralising Crystals to the tank. If the water
foams, add a few drops of Foambreaker antifoam chemical.
Continue circulating in both directions for fifteen minutes, then
set to dump mode and dump for at least ten minutes to clear
all chemicals. Check the water leaving the dump hose with pH
paper. Continue dumping until the paper shows a pH of 7 or
the same pH reading as the property’s main water supply.
Set the Clearflow to normal re-circulation mode.
The heating system has now been fully flushed and is full of
fresh clean water. You should now add a good quality corrosion
inhibitor, such as SystemSafe-DM. First open the dump valve
to reduce the water level in the tank to 5cm (2”) above the
minimum line.
Flow
reverser
lever
Water
inlet
valve
Motor
switch
Page 3
Commencing the power flush
What happens when dumping
Addition of power flushing chemicals
Dumping the heating system water
Use of stronger power flushing chemicals
On completion of the power flush
