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Installation Testing & Repair
The pump system is designed not to require maintenance. If
the pump runs but water builds up in the tray, first establish
the nature of the problem by following the following procedure.
This must only be carried out by a qualified contractor.
TEST PUMP SUCTION - Remove the pump inlet coupling
and press the test button to start the pump. Place a
finger in the inlet hole and sense how much the pump is
sucking. If strong suction is felt, examine the installation
and clear the blockage or check for air leaks as follows.
RODDING PIPEWORK - When a blockage is apparent,
disconnect the pump from the waste pipe, insert and attempt
to push the blockage through the pipe with a separate piece
of pipe size smaller than that installed. For example, to rod a
15mm pipe use a 10mm pipe as your rod to clear blockage,
and likewise for a 22mm pipe use a 15mm rod. This is an
effective way of ensuring any blockage is removed from the
waste pipe run. An alternative option for a rod is a 6mm drain
rodding spring if one is available.
EXTERNAL PIPEWORK TEST - Make up external pipe work
from the pump directly across the bathroom floor and elbow
into the gulley. Use elbows as required and up to 3m of pipe.
See Fig1.7. Turn the shower on. If water is removed from the
tray, then the issue exists in the pipework between the gulley
and the pump.
AIR LEAK TEST - Run a clear tube from the discharge to the
sink. If water builds up and fills the gulley, yet air is seen in the
clear tube on discharge, then the air must be coming from the
pipe work. Check and secure all above floor fittings. If these
are eliminated investigate the underfloor pipe work by lifting the
floor/tray. See Fig 1.7
FLOW RATE TESTING - A convenient way to measure the
flow rate is to get a 2ltr plastic jug and mark the 2ltr level in
black pen. Turn the shower on to where the customer
normally uses it - often maximum setting.
Put the jug under the shower head and measure how long it
takes for the jug to fill to the 2ltr line.
Longer than 20 seconds indicates flow rate of less than 6ltrs
per minute - typical for electric showers.
Shorter than 15 seconds indicates a flow rate of more than
8ltrs per minute - normal for mixers.
CHECK TRICUSPID VALVE - Remove the tricuspid valve
holder screwed onto the pump discharge. Remove the rubber
valve and assess its condition. If it is worn or stiff then change
and re-test. It is good practice to replace the tricuspid valve
when doing any routine service.
CHECK INSIDE PUMP HEAD - Remove the clamping ring
and pump head carefully so as not to disturb the seating of
the diaphragm. Check that the valves in the pump head are
clear of debris. Remove any debris and rinse out the pump
head before refitting the pump head and clamping ring.
Ensure that the diaphragm bead is not pinched, as this will
cause poor pump performance.
If the diaphragm has become unseated, disconnect one low
voltage lead at the pump, press the test button and briefly
touch the disconnected leads together. This will change the
position of the diaphragm. Do this until the diaphragm is at its
lowest position. The diaphragm bead will now push easily into
the groove on the pump body and the head will also fit easily
onto the diaphragm bead without pinching it. Then refit and
tighten clamping ring. Check for leaks whilst pump is running.
Spare parts and accessories are listed on Page 22.
Fig 1.7
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