6 About the Boiler
2.2 Parts of the Boiler
Front View
Exhaust
Gas Vent
Combustion
Air Intake
Bottom View
# Description
a Pump Drain Plug
b Space Heating Strainer
c Space Heating Supply Connection
d Space Heating Return Connection
e DHW Hot Water Outlet Connection
f Gas Connection
g Cold Water Inlet Filter
h Condensate Water Outlet
i Auto Feeder Connection
j Cold Water Inlet Connection
2.1 Description of the Boiler
The Navien NCB boiler is available in 3 models: NCB-180, NCB-210,
and NCB-240.
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.
●
Automatic Water Fill: Should the water level in the system fall too
low, a sensor will automatically activate the refill circuit.
●
Freeze Protection: A sensor inside the boiler automatically
detects the temperature and, if necessary, initiate 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.
●
Thermostat Control Failure: Should the thermostat fail to
function properly, the boiler’s gas supply will be shut off
automatically as a safeguard.
●
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
a
b
c
d
e
f
g
h
i
j
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