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SECTION 5
PAGE 28
BOILER MAINTENANCE
Before starting work a risk assessment should be
carried out on the boiler house to determine the safety
of the working environment.
It is essential for efficient and trouble free operation
that the boiler plant is regularly maintained. This must
be carried out by qualified and experienced engineers
and in the case of gas fired appliances attention is
drawn to the mandatory requirement of CORGI
registration of personnel undertaking work on these
appliances. This facility is available from Potterton
Commercial Division service department, details are
available on the rear of this manual.
Before commencing servicing of a boiler a combustion
test must be taken.
Boilers should be serviced and re-commissioned as a
minimum on an annual basis for gas and twice a year
for oil.
It is strongly advised that a maintenance contract
be
entered
into with
Division to ensure that the boiler/burner unit is
correctly and properly maintained.
WARNING: Isolate the electrical and fuel supplies
before attempting any maintenance work.
Cleaning of Flue Surfaces
The boilers are supplied with a set of cleaning tools
comprising of flueway brushes and extension rods for
routine cleaning. Boilers may require periodic cleaning
with specialist mechanical equipment dependent on
boiler conditions, fuel type, etc.
Cleaning of the boiler requires opening of the door
and removal of the flue covers, front and rear under
the flue cover.
Frequency of boiler cleaning varies and is dependent
on site conditions, fuel type, heat load, design of
controls and running conditions.
For maximum efficiency and economy in running, it is
essential that the combustion chamber and flueway
surfaces should be kept clean and free from deposits.
Deposits should be disposed of in a manner not to
cause inconvenience to any persons.
A layer of deposits 1.5mm thick will reduce the heat
transfer through the tube wall by up to 10%. Not only
does this waste fuel but the higher flue gas
temperatures that result will increase the thermal
stress within the boiler and may lead to joint leakage
or in extreme cases section failure.
POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
Potterton
Commercial
Natural Gas & LPG Fired Boilers
We recommend brushing out, twice a year, of the
combustion chamber and flueways and the removal of
the rear clean out covers to check for deposits in the
flue box.
Class 'D' Fuel Oil & Class 'C2' Kerosene
The boilers should be brushed out thoroughly at least
bi-monthly for Class D (35 second) and Class 2 (28
second) during the heating season but more frequent
attention may be necessary dependant on the
operating conditions to prevent the formation of hard
adherent scale on the tube surfaces.
It is essential to ensure that cleaning is carried out
throughout the full length of the flue tube passes and
that the rear clean out covers are taken off to allow for
removal of deposits brushed through into the flue box.
Regular cleaning is essential, as a build up of hard
deposits can be extremely difficult to remove.
Sludge Gas
Maintenance of boilers running on these fuels will be
required at more frequent intervals, possibly on a
weekly basis or even a daily basis dependent on fuel
type and quality.
Boiler Ancillaries
Check the sealing rope on the boiler door is in place
and sealing the combustion chamber. Keep a regular
check on the condition of the door refractory around
the burner draught tube. If there is any deterioration
this must be made good immediately to prevent
damage to the boiler and burner.
Boiler Controls
The operation of boiler controls including control
thermostat,
high/low
thermostat must be checked every visit.
Safety Interlocks
The operation of safety interlocks such as flow proving
on mechanical flue/ventilation systems must be
checked to ensure that operation of the boiler is
prevented on a fault.
FOLLOWING MAINTENANCE THE BOILERS MUST
BE RECOMMISSIONED.
NXR4
thermostat
and
overheat
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