Mack MRU - Page 21

INSTRUMENTSANDCONTROLS17
1PowerOnIndicator(Green)—ThisgreenLEDshouldalwaysbeon.Nopower
on/offswitchisprovidedforthisunitasitshouldbeonatalltimes.
Note:Whenthebatteryisdisconnected,themethanedetector/alarmsystemwill
notoperatesothegreenlightwillnotbeon.Themethanedetector/alarmsystemis
poweredbythebatteryandisactiveatalltimesunlessthebatteryisdisconnected
orthefuseisblown.Hand-heldmethanedetector/alarmdevicesshouldbeused
whenworkingonnaturalgasvehicleswithanon-functioningordisconnected
methanedetector/alarmsystemandwherenoauxiliarymethanedector/alarm
systemisinstalled.
DANGER
WHENAPPROACHINGTHECABTOENTER:
DonotopenthevehicledoorsiftheREDLAMPISON!Donotopenthe
vehicledoorsiftheALARMISSOUNDING!Donotopenthevehicledoorsif
theGREENLAMPisNOTON!
IftheindicatorlampisRED,ifthealarmissoundingorifthegreenlampis
NOTON,itisunsafetoopenthevehicledoorsbecauseevenstaticelectricity
canigniteconcentratedmethanefumesinanenclosedarea.Immediately
implementthefollowingprocedure:*
Removeallpersonnelfromthearea.
Turnoffelectricalcircuitsandsourcesofignitionintheimmediatearea.
ManuallyturnofftheFuelShut-OffV alveoneachfueltanktopreventfurther
gasleakage.Waituntilthegashasdissipatedandthealarmsituationhas
cleared.Itisnowsafetoopenthevehicledoorsandwindowstoventthevehicle.
Donotoperatethevehicleuntilthesourceoftheleakhasbeenrepaired.
*Dependingonlocalordinancesorcompanypolicy,itmayberecommendedthat
emergencypersonnelbecontactedtoimplementtheseprocedures
DANGER
theeventofanalarmwhileoperatingthevehicle,immediatelyopenthecab
windows,safelystopthevehicle,shutdowntheengineandturnofftheignition.
Exitthecabandleavethedoorsandwindowsopentoventthevehicle.Manually
turnofftheFuelShut-OffV alveoneachfueltanktopreventfurthergasleakage.
Waituntilthegashasdissipatedandthealarmsituationhascleared.Donot
operatethevehicleuntilthesourceoftheleakhasbeenrepaired.
2SignicantSensorAlarmIndicators(Red)—IlluminationoftheredLED
for"Zone1"(cabcompartment)or"Zone2"(enginecompartment)indicates
thesystemhasdetectedgasfumesinconcentrationsabove50%oftheLower
ExplosiveLimit(LEL)andanaudiblehornwillsound.