© MHG Heating Ltd
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MHG Heating Ltd Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey KT20 5LR
Telephone 08456 448802 Fax 08456 448803 Email
Web www.mhgheating.co.uk
140116
copious amounts of fresh water.
ProCon Combustion Chamber Cleaning Granules
are available from MHG
Heating Ltd Spares Department.
A STEEL OR PVC BRUSH MUST NOT BE USED TO CLEAN THE HEAT EXCHANGER.
i)
Following the cleaning of the Heat Exchangers, the condensate syphon must be flushed to ensure that all mineral
deposits/debris that has been washed from the heat exchanger surface is correctly removed. Open the syphon
cleaning point cap at the base of the boiler, with a suitable receptacle directly below to collect the syphon
contents. Safely dispose of the contents of the syphon. Replace the receptacle below the cleaning point and
poor 2 litres of clean tap water into the heat exchanger, which will drain through the cleaning point. Refit the
cleaning point cap and poor half a litre of clean tap water into the heat exchanger to ensure the syphon is re-
flooded. Check the cleaning point cap for leaks.
j)
Visually check the burner surface for signs of damage and debris build-up. Remove any debris build up with
compressed air. If excessive debris build-up is identified, the burner lance should be removed and the inner metal
surface should be washed and cleaned.
A BRUSH, OF ANY KIND, MUST NOT BE USED TO CLEAN THE
BURNER SURFACE.
If damage has occurred to the burner surface, the burner MUST be replaced.
k)
To ensure that the rectification circuit operates correctly the resistance between the burner and burner door must
be check with a multi-meter to ensure that it is less than 1 Ohm (<1 Ohm.)
l)
Clean with abrasive material and inspect the ignition electrode. Replace if necessary. Adjust the spark gap to
4mm.
m)
Check the combustion fan blades for debris build-up. Remove any debris with a soft bristle brush or preferably
compressed air.
DO NOT TOUCH, OR SPIN, THE FAN BLADES WITH YOUR FINGERS AS THIS COULD
AFFECT THE BALANCING OF THE FAN BLADES.
n)
Re-fit the Burners, in the reverse order of dismantling, ensure that all electrical connections are correctly and
securely connected.
o)
Inspect all water joints. Any joints found to be leaking MUST be replaced. It is also advisable when replacing
water joints to also change any adjacent joints at the same time.
p)
Inspect all gas joints with a suitable leak detection method. Any joints found to be leaking MUST be replaced. It is
also advisable when replacing gas joints to also change any adjacent joints at the same time.
q)
Via the tappings on the boiler connector elbow or straight a flue gas recirculation check must be undertaken when
the boiler is operating on high and low fire modes.
r)
With the use of a suitable Flue Gas Analyser, check and adjust the combustion settings, as detailed in Section
13.2.
s)
Inspect the general condition of the flue system, including the termination, repair as necessary or advise on any
remedial action as required.
t)
service message with the following three operating lines are reset:
Expert
maintenance / special mode
7041 Burner run hours since maintenance
Expert
maintenance / special mode
7043 Burner starts since maintenance
Expert
maintenance / special mode
7045 Time since maintenance
Confirm the selection with the OK button
The display "Reset" Flashes Select YES using the rotary knob.
Confirm the selection with the OK button
The counter starts again at zero
Repeat steps for the operating line 7043
