Case 621G - Page 234

7-MAINTENANCE
CleanUpCatalyst(CUC)
TheCleanUpCatalyst(CUC)islocatedattheendofthe
SCRcatalyst.TheCUCconvertstheammonia(NH
3
)slip
tonitrogen(N
2
)andwatervapor(H
2
O).TheCUCensures
thattheammoniasliptoambientisminimal.
LEIL14WHL0450AA6
621G
LEIL13WHL0308AA7
721G
Exhaustap
Theexhaustapisadevicelocatedbetweentheturbine
andtheexhaustsystem.Theexhaustapisequipped
withathrottlevalvewhichmanagestherateandthe“light
off”temperatureoftheexhaustgas.
The“lightoff”temperatureindicatesthetemperatureat
whichthecatalyticprocessisinitiated.
LEIL13WHL0312AB8
7-26