IBC SL 35-199 Operating Instructions Manual page 47

Combustion air intake riser
Removing combustion air intake riser
Removing combustion air intake riser
Removing vent stack
MAINTENANCE
SL 35-199, SL 45-260 MODULATING GAS BOILERS
Vent temperature sensor bracket
Water temperature high limit switch
Upper vessel high limit switch
Outlet (supply) water temperature sensor
Inlet (return) water temperature sensor
Removing vent stack test port plug
Water pressure sensor
Control Module disconnection
4-5