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SECTION B – USING THE CLEARFLOW PUMP FOR POWER FLUSHING
INTRODUCTION
Clearflow pumps are designed to power flush heating
systems with minimal dismantling, by circulating water
and flushing chemicals at high velocity, and then purging
the dirty water from the system with a high flow of fresh,
clean, water. Radiators may be individually flushed
without removing or disconnecting them from the
system.
SYSTEM INSPECTION AND PREPARATION
1. Turn on heating system in order to identify problem
flow areas, cold radiators, or those with cold spots,
etc. Switch off system.
2. Note how many turns are required to shut off radiator
and lock shield valves so that settings may be re-
instated after flushing to avoid system balancing. Use
a copy of the chart provided to record the number of
turns.
Open all (both sides of radiator) valves fully.
3. Set any thermostatic radiator valves 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.
4. If an anti-gravity / check valve is present, this must be
by-passed or bridged to allow the flow reversing
action to be used. It may be possible to dissemble the
anti-gravity valve, and remove internal components.
5. Tie up the ball cock or turn off the mains water supply
by another means.
6. Drain enough water from the system to empty the F&E
tank. This can be drained into the Clearflow tank if it
has already been connected (connection details are in
the next section).
7. With vented systems, it is necessary to cap off, or loop
together, the expansion and cold feed pipes in order
to avoid the flushing pump filling and overflowing the
expansion tank.
The F&E pipes may be capped with push fit end caps,
such as Speedfit, Prestek, or Hep
compression fitting gate valve.
Issue: May 2023
Pumps with 230 volt motors are single phase, for use on a
standard domestic supply. A 5 ampere fuse should be
fitted in the plug top. We recommend the use of a
residual current circuit breaker plug or adapter for extra
protection.
NOTE 1: This will only be effective when the F&E pipes
NOTE 2: The looping connection may be made with any
ENGINEER'S TIP: Don't drain water from the system to
O, or a temporary
2
Section B – Using the Clearflow pump
Depending on the configuration of the heating
system looping the feed and expansion pipes
together may enable these pipes to be flushed during
the cleansing process, which can be beneficial when
the cold feed pipe contains corrosion deposits.
are not close coupled, or connected via an air
separator, and may not remove deposits which have
hardened over a long period of time.
sturdy flexible tubing, such as Kamco hose, or Hep2O,
but should incorporate a valve in the loop to close the
circuit when flushing individual radiators.
Capping or looping together the F&E pipes are only
temporary measures, which must be removed after
the flushing process.
lower the water level in the F&E tank until after the
flushing pump has been connected into the system.
Tie up the f & e tank ballcock or otherwise turn off
the cold water feed, and return to the flushing pump.
Open both the isolating valves, without switching on
the electric motor. The head of water in the house
means that heating system water will run down the
flow and return hoses and into the tank. Let the
water run until the tank is half full, and close both
isolating valves.
You should now have emptied the f & e tank
sufficiently to carry out the necessary valving or
capping off of the cold feed.
NOTE: If there is a large amount of sludge or slime
present in the f & e tank it must be cleaned manually
and not drained into the
system.
Page B.1
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