3-5
STARTUP AND COMMISSIONING
SFC COMBI BOILERS SFC-99, SFC-125
Figure 43: Back Flow Valve
Figure 44: Blower and Gas Valve Assembly
WARNING
Each SFC series unit is
equipped with a back ow
valve installed at the outlet of
the fan. Inspect the back ow
apper annually.
3.4.1 Gaining access to combustion chamber, burner
removal instructions
DISASSEMBLY
1. Turn off the main power switch to the unit.
2. Turn off the gas supply valve to the unit.
There is no need to drain the unit unless the unit will be exposed to freezing
conditions while off.
3. Remove the front cover, and allow the unit to cool.
4. Unplug the electrical connector at the gas valve and fan.
5. Loosen the lower gas valve connection nut.
NOTE: There is an O-ring in the lower gas connection and an O-ring and
orice in the upper gas valve connection. Place these in a safe location to
be used for reassembly. Cover the gas piping connections to prevent debris
from entering the gas piping.
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