IBC HC Series Installation And Operating Instructions Manual page 51

WARNING
Fan Outlet Orifice (25mm)
must be installed in the DC
23-84 model. If the fan is
being replaced the orifice
must be reinstalled in the new
fan.
Back Flow Insert
WARNING
When converting a Natural
Gas boiler to Propane,
the Back Flow Flapper
must be replaced with the
Propane Back Flow Flapper
(see instructions in fuel
conversion kit). Failure to
replace the Flapper may
result in damage to the boiler,
serious injury or death.
STARTUP AND COMMISSIONING
HC SERIES BOILERS HC 13-50, HC 23-84, HC 29-106, HC 20-125, HC 33-160
Figure 35: Blower and Gas Valve Assembly
Figure 36: Orifice and O-ring
3-5