About The Boiler; Description Of The Boiler; Parts Of The Boiler - Navien NFC Series User's Information Manual

2. About the Boiler

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.
6 About the Boiler

2.2 Parts of the Boiler

2.2.1 Front View
Combustion
Air Intake
2.2.2 Bottom View
A B
3.4" (87 mm) 3.3" (85 mm)
2" (53 mm)
14.6" (370 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
Exhaust
Gas Vent
C D E F G
5.4" (136.6 mm)