BS EN 298:2012 pdf download

BS EN 298:2012 pdf download.Automatic burner control systems for burners and appliances burning gaseous or liquid fuels.
3.118
running position
position of the system in which the burner is in normal operation under the supervision of the programming unit and its flame detector device
3.119
Controlled shut-down
process by whioh the power to the shut-off valve(s) is removed before any other action takes place as a result of the action ala controlling function
3.120
safety-shut-down
process which is effected immediately following the response of a protection device or the detection of a fault wi the automatic burner control system and puts tne burner out of operation
Note 1 to ently The mesulbng state of the system Is de?ned by deactivated termnnals for the shut-of? valves and the ignition device
3.121
lock-out
Note ito ontrlr Lock-out can mean non-volatile lock-t or volatile lock-out
3121.1
non-volatile lock-out
safely-shut-down condition of the system, where a restart can only be accomplished by the manual reset of the system and by no other means
3121.2
volatile lock-out
safety-shut-down condition of the system, where a restart can only be aocon’iphshed by either the manual reset of the system, or an interruption of the main power and its subsequent restoration
3.122
Ignition restoration
spark restoration
process by which. fofloatng loss of flame snal, the ignition device is switched on again without total interruption of the fuel supply
3.123
recycling
process by wNdi. after a safety-shut-down, a full start-up sequence Is autorrialically repeated
3124
timings
3.124,1
waiting lime
for burners without fans, interval between the start signal being given and the energizabon of the ignition device or shut-off valves, whichever comes first
Note 1 to entry During this time natural ventilation of the combustion chamber and the flue passages can take aoe.
3124.2
waiting time
interval between the start signal being given (and aw registers in purge position. if applicable) and the energizabon of the ignition device
Note 1 to entry: During this tine natural ventilation of the combustion chamber and the Itue passages takes place.
3124.3
pre-purge tame
period during Which purging takes place at the proven air rate prior to the enorgizahon of the ignition device or shut-off valves, whichever comes fast
3124.4
pre-purge time
period preceding the signal to open the shut-off valve during wNch the combustion chamber is compulsorily ventilated
3,124.5
post-purge time
period during which purging takes place at the proven air rate between any shut-down and the moment the fan is switched off
3,124.6
post-purg. time
penod following the signal to close the shut-off valve during which the combustion chamber is compulsorily ventiLated
3.1247
Inter-purge time
period during which purging of the combustion chamber takes place at the proven air rate after unsuccessful ignition and prior to the next recycle attempt
3,124.8
inter-waiting time
period during which natural ventilation of the combustion chamber takes place after unsuccessful ignition and prior to the next recycle attempt
3,125
sequences
3125.1
start-up sequence
sequence of actions executed by the system which brings the burner from the start position to the running
3,1252
first stage
part of the start-up sequence which allows the release of start fuel into the combustion chamber
3.1253
second stage
part of the start-up sequence which allows the release of further fuel into the combustion chamber
3,126
system for permanent operation
system that is designed to remain in the running position for longer than 24 h without interruption
3.127
system for non-permanent operation
system that is designed to remain in the running position for less than 24 h.
3.128
self-checking function of the flame detector device
automatic intermal function of the system which checks the operation of the flame detector device
3.129
air flow simulation
condition which occurs when the air flow sensor indicates the presence of air flow when in reality no air flow is
present
3.130
spark supervision
process of monitoring the ignition spark
3.131
pilot or start fuel flame proving period
interval between the end of the first safety time and the beginning of the second safety time which is used to
prove that the pilot or start fuel flame is stable
3.132
intermittent first stage
first stage that is ignited prior to ignition of the main flame and is shut off simultaneously with the main flame
3.133
interrupted first stage
first stage that is ignited each time the burner is started up and which is extinguished at the end of the second
safety time
3.134
burner ignition systems
3.134.1
ignition by supervised gas-fired pilot burner
system which releases the main fuel when the ignition burner flame is present
3.134.2
ignition by non-supervised gas-fired pilot burner
system in which the release of the main fuel is not prevented by the absence of the flame o the piliot burner.