A power flush should only be carried out by a suitably trained
person familiar with all aspects of heating systems.
This pump may be used with any commercially available flushing
and descaling chemical.
Connect each hose to its connection point (see diagram), ensuring
that there is a seal in each brass hose connector. Turn the brass
connectors clockwise until hand tight.
The following is a brief guide to the procedure and may NOT
be correct for all systems.
Turn on the heating system and identify problem flow areas,
cold radiators, or those with cold spots, then switch the
system off. Make a note of the location of each radiator and its
condition.
Carefully record how many turns are required to shut off
the radiator and lock shield valves. This will enable you to
‘balance’ the system quickly once you have finished. Open all
valves fully (both ends of radiator).
Thermostatic radiator valves must be set to the fully open
position. Remove the heads and check that the plunger pin
moves freely. Check that diverter or zone valves are in the fully
open position, setting manually if necessary.
If an anti-gravity / check valve is present, this must be by-
passed or bridged to allow the flow reversing action to be
used. Tie up the ball cock or turn of the mains water supply by
another means.
Drain enough water from the system to empty the F&E tank.
This can be drained into the Clearflow tank once the pump is
connected.
You will need to either cap off, or loop together, the expansion
and cold feed pipes to avoid filling and overflowing the
expansion tank. Looping the feed and expansion pipes
together may enable them to be flushed during the cleansing
process if they are not close coupled in the heating system, or
connected via an air separator.
The hose between the two pipes should incorporate a valve
so that the circuit can be closed off when flushing individual
radiators and should be removed after the power flush.
Position the unit in a room with
a suitable drain point and a
mains water supply.
Set both isolation valves to the
closed position.
Run the drain hose and
overflow hose to a suitable
drain.
Connect the mains water supply
hose to a suitable fresh water supply. Open the orange valve
and fill the tank with water to a level between the Minimum
and Maximum marks.
The normal precautions during work on any heating system
should be taken, place a drip tray or waterproof groundsheet
underneath the pump and surrounding area.
Connect the flow and return hoses to the heating system at
the selected point.
Alternative options are:
Connection to the circulator pump fittings.......
Close the circulator pump isolating
valves. Remove the complete
pump. Screw the two 1.1/2” BSP
male ended hose adaptors on
to the end of the standard flow
and return hoses, and connect on to the circulator pump
isolating valves. Only open the isolating valves once the unit is
connected.
Connection onto radiator pipe ‘tails’...
Across the “tails” to a radiator (having drained and
disconnected this radiator) using appropriate 1/2” or 3/4” BSP
female adaptors to connect to the valve bodies. The radiator
valves should be closed to isolate the flushing pump from the
system until power flushing is commenced.
Connection to flow and return pipework to boiler...
Across the flow and return connections at the boiler isolating
the boiler itself.
Connection across cold feed and expansion pipes...
By connecting across the cold feed and expansion pipes when
not adjacent to each other in the same pipe run. Isolate the
water supply to the F&E tank prior to fitting.
First use the Clearflow pump alone to loosen and mobilise
sludge and debris into the fast moving system water, and
discharge the worst of the loose debris to waste. Only after
Preparation of heating system
Connecting the pump to heating system
Pump location and preparatory work
Flow &
return hoses
Dump
hose
Water inlet
hose
Overflow
hose
Brass hose
connector
Combination Boiler Systems........
The above connection method is generally used when
power flushing a system with a combination boiler, when
the system circulator pump is located in the boiler casing,
and is difficult to access. Alternatively, use a Kamco CP2
pump head adaptor.
Additional advice relating to combination boiler
systems......
During power flushing, there is no circulation through the
secondary heat exchanger of combination boilers.
To minimise the possibility of debris being pushed into the
secondary heat exchanger circuit, close the boiler isolation valves
during this first stage of the power flushing process.
GETTING STARTED
Power flushing procedure
Page 2
Vented systems
