IBC SL 28-160 Installation And Operating Instructions Manual page 49

Combustion air intake riser
Removing combustion air intake riser
Removing combustion air intake riser
Removing vent stack
MAINTENANCE
SL 28-160 MODULATING GAS BOILER
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
Ignition electrode/flame sensor
Control Module disconnection
4-5