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FAULTS AND THEIR CAUSES
Any fault in the system design or malfunction of system components will generate
customer complaints. These can be grouped into the following three main
categories:-
• The system is noisy
• Hot water service is unsatisfactory
• Space heating service is unsatisfactory
CAUSES OF A 'NOISY' SYSTEM
Noisy heating pump operation:-
• Check the pressure in the system, which should not be less than 1.0 bar when
cold and vent if necessary.
• Check the pump speed setting of the heating system pump - reduce if necessary
but ensure that the temperature difference is about 11°C.
• If the system is noisy when in heating mode only - check and adjust if necessary
the system bypass (if fitted).
Noisy electric flow boiler operation:-
• Check the flow rate through the integral electric boiler when switched on by
measuring the temperature rise across the boiler. If the temperature rise is greater
than 11°C, then increase the pump speed.
• Check the pressure in the system which should not be less than 1.0 bar when
cold and vent if necessary.
Noise when hot water is opened:-
• If the pump is noisy when the hot water tap is opened, then check the system
pressure which should not be less than 1.0 bar and vent the pump if necessary.
• Water hammer - loose pipework and/or tap washers.
CAUSES OF 'UNSATISFACTORY HOT WATER
SERVICE'
1. Check the pressure in the system which should not be less than 1.0 bar.
2. Check that the electric flow boiler is working normally.
3. Check that the 3 port mixing valve is set to maximum i.e. setting '4' .
4. Check that the store is being charged to the correct set point temperatures
for the on/off peak supply as shown on page 32.
5. Check that the hot water plate heat exchanger pump starts when the hot water
tap is opened and stops shortly after the tap is closed.
6. Check that the plate heat exchanger pump is set at maximum speed.
7. Check that the hot water outlet temperature does not change significantly when
the hot water flow rate is increased from say 5 litres/min to 15 litres/min.
8. Check that the space heating load is not greater than specified for the unit and
that the occupant knows how to use the programmable room thermostat.
3.0 SERVICING
3.4 FAULT FINDING
9. If 1 to 8 are correct then it is likely that
the performance of the heat exchanger is
impaired by scale. In this case the hot water
flow rate will be noticeably less than the
cold. Replace it with a factory exchange unit
and re-check hot water performance.
CAUSES OF
'UNSATISFACTORY
SPACE HEATING'
1. Check the pressure in the system which
should not be less than 1.0 bar.
2. Check that the 3 port mixing valve is set to
maximum i.e. setting '4' .
3. Check that the electric flow boiler is
working.
4. Check that the space heating load is not
greater than specified for the unit.
5. Check that the flow temperature is at least
70°C. If not check functioning of the 3
port mixing valve - adjust or replace if
necessary.
6. Check the operation and the settings of the
programmable room thermostat.
7. If some rooms are not being heated
properly, then increase the pump speed
to establish a temperature difference of
11°C and if necessary balance the system/
check the operation of any TRV's.
POWERFLUSHING/
CLEANING OF THE
HEATING SYSTEM
If it is proposed to 'powerflush' the heating
system we would recommend that the
ElectraMate appliance is isolated from the
heating system being cleaned. Failure to do
this could seriously damage the appliance.
When carrying out the work always comply
fully with the manufacturers instructions for
the powerflushing equipment being used.
If in any doubt please consult our Technical
Helpline.
Page 30
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