dunphy TAD4, Operating Manual

Page: 78 / 165

Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 78 of 165 TD/TAD4 Manual Rev 4
8.2 Minor Maintenance
(a) Check the operation of the flame failure system daily by deliberately locking out the burner.
This can be achieved by either removing the UV cell, or on burners fitted with ionisation
probes isolating the gas supply to the burner.
(b) Where fitted, check and regularly clean the UV cell window with a soft cloth.
(c) Inspect the burner control cabinet to ensure that all indicator lamps are serviceable.
(d) Make a general check for cleanliness and security.
(e) As convenient, make an inspection of the combustion head components for cleanliness,
security and serviceability.
(f) Check the main gas valves for external hydraulic fluid leaks.
(g) Confirm the security of all linkages, locking nuts and any component parts fitted to the
burner
(h) Where a micro-ammeter is fitted make regular checks to confirm that the UV cell output
does not significantly deteriorate.
8.3 Major Maintenance
Take adequate safety precautions against the small amount of gas which escapes when gas train
components are removed.
Carry out all of the maintenance tasks listed above, plus the following:
(a) Remove the upstream pilot valve and determine the amount of dust etc. which is present. If
a substantial quantity is found, remove the upstream main gas valves from the burner and
clean the seats (Unibloc only, see 'Unibloc' section of this manual for actuator removal).
The Siemens valve is a sealed unit – any unauthorised opening will invalidate warranty.
(b) Check and clean any gas filters in the site pipework if significant quantities of dust or scale
are found. Make a request to the gas region for similar work on the service filter which
protects the meter
(c) Confirm correct operation of electrical components, e.g. control boxes, motor starters etc
and check tighten all electrical terminals.
(d) The nominal life of a U/V cell is 10,000 hours, subject to regular checks of the cell output
as registered on the micro-ammeter (which might indicate an earlier deterioration) the cell
should be changed every third year.
(e) Disconnect the air shutter linkage at the shutter spigot. Move the shutter by hand to confirm
freedom of movement. Clean as necessary (the PTFE bearing surfaces need no lubrication
but will require replacement when worn)
(f) Inspect the refractory of the burner mounting plate. Make good any defects in refractory or
sealing
(g) Ensure that boiler furnace sight glasses are clean and that their sealing is flue gas-tight.
(h) When the inspection and any rectification work has been completed on the burner/boiler,
bring the unit up to working temperature (slowly).
(i) With the boiler on line, confirm that the fuel throughput and combustion efficiency are
equal to the 'commissioned' figures.