Delta MCS-1800 Service Manual download pdf (Page 49)

MHG Heating Ltd Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey KT20 5LR

Telephone 08456 448802 Fax 08456 448803 Email info@mhgheating.co.uk Web www.mhgheating.co.uk

020315 Draft

Routine Cleaning & Maintenance

As part of the Routine Service Inspection, certain areas of the boiler need to the checked and cleaned as necessary.

a) Turn the boiler OFF at the ON/OFF switch and electrically isolate the boiler by removing the plug or fuse from

the boiler supply.

b) Turn off the gas at the boiler isolation tap, fitted by the installer, adjacent to the appliance.

c) Remove the electrical connections, Gas valve balancing pipe and air inlet duct from the units fan assemble.

d) Disconnect the earth lead, HT cap and Lead from the ignition electrodes.

e) Loosen and disconnect the inlet gas supply form the gas valve. (Inspect and clean the inlet filter of the gas

valve.)

f) Disassemble the burner by removing the six M6 nuts around the burner door, using a 10mm Spanner. Pull the

burner forward and remove from the heat exchanger. Gently put to one side.

g) Once access has been gained to the combustion chamber and lower heat exchanger, visually inspect the heat

exchanger coils.

It is usually only necessary to clean the lower section of the heat exchanger. If server deposits are found, the

upper section of the heat exchanger should also be checked and cleaned, which may necessitate the removal

of the heat exchanger from the boiler.

If any coils appear to be significantly dis-coloured, then a blockage of either scale, magnetite, or general

system debris has occurred which will have allowed excessive overheating to have occurred within the coil. If

dis-colouration has occurred, then specialist de-scaling of the heat exchanger will be required, however,

stress cracking may have occurred, and the heat exchanger may become porous following the de-scale

works.

h) If the heat exchanger has not suffered from dis-colouration, as ‘Item g’ above, then a Standard Service can be

undertaken. Using a natural bristled brush ONLY, remove the worst of the mineral/debris build up. With the

use of the dissolved

ProCon Combustion Chamber Cleaning Granules

, spray the solution onto the heat

exchanger surface and leave for approximately 5 minutes. This will help to remove any stubborn mineral

deposits and clear the condensate drain connections. Finally brush the heat exchanger whilst rinsing

thoroughly with 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 one 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.)

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Delta MCS-1800 Service Manual Page 49

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