3-5
STARTUP AND COMMISSIONING
HC SERIES BOILERS
HC 13-50, HC 15-95, HC 15-96, HC 20-125, HC 33-160
Back Flow Insert.
Note NG-only
flappers shown.
Dual-fuel flapper is
black.
Figure 35A: Blower (Torin) and Gas Valve Assembly (all models
except HC/DC 15-95)
Figure 36: Orifice and O-ring
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
use the Propane Flapper may
result in damage to the boiler,
serious injury or death.
3.5.1 Gaining access to combustion chamber, burner
removal instructions
DIS-ASSEMBLY
1.
Turn off the main power switch to the boiler.
2.
Turn off the gas supply valve to the boiler.
3.
There is no need to drain the boiler’s water unless the boiler will be subject to
freezing conditions while the boiler is off.
4.
Remove the front cover and allow the boiler to cool.
Figure 35B: Blower (EBM) and Gas Valve Assembly (HC/DC
15-95 only)