6 About the Boiler
2.2 Parts of the Boiler
2.2.1 Front View
Exhaust
Gas Vent
Combustion
Air Intake
2.2.2 Bottom View
2.6” (67 mm)
9.7” (247 mm)
5.2” (131 mm)
8.5” (215 mm)
10.6“ (269 mm)
3.3” (85 mm)
5.4” (136.6 mm)
2” (53 mm)
3.4” (87 mm)
# Description
A Heating Supply
B Hot Water Outlet (DHW)
C Cold Water Inlet (DHW)
D Auto Feeder Inlet (Make-up Water)
E Heating Return
F Gas Connection
G Condensate Outlet
2.1 Description of the Boiler
The Navien NFC boiler is available in 2 models: NFC-175 and
NFC-200.
The main features are as follows:
●
Power Interruption: When the power is restored after a power
failure, the boiler will automatically start and return to normal
operation. A manual reset is not required.
●
Freeze Protection: A sensor inside the boiler automatically
detects the temperature and, if necessary, initiates a safety
heating cycle to prevent internal equipment damage due to
freezing temperatures.
●
Short-Circuit Protection: Any short-circuit occurring in the
boiler’s electrical circuit immediately blows the internal glass
fuses and automatically cuts off the gas supply.
●
Lightning Protection: Each boiler is specially grounded, both
internally and externally, to protect against lightning strikes.
●
Carbon Monoxide Protection: The boiler is designed to maintain
a safe air-to-gas ratio and combustion rate. This function is
continuously monitored by the boiler’s air ratio control module.
●
Auto Fan Detection: The rotation of the fan is automatically
detected and controlled. Fan failure will stop the operation of
the boiler.
●
Boiling Prevention: Excessive temperatures will automatically
stop the boiler.
2. About the Boiler
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