Connecting The Power Supply - Navien NCB-150E Installation & Operation Manual

8. Connecting the Power Supply

WARNING
Improperly connecting the power supply can result in electrical
shock and electrocution. Follow all applicable electrical codes
of the local authority having jurisdiction. In the absence of
such requirements, follow the latest edition of the National
Electrical Code (NFPA 70) in the USA or the latest edition
of CSA C22.1 Canadian Electrical Code Part 1 in Canada.
Connecting the power supply should be performed only by a
licensed professional.
When connecting the power supply, follow these guidelines:
Do not connect the electric supply until all plumbing and gas
piping is complete and the boiler has been filled with water.
Do not connect the boiler to a 220-240V AC power supply. Doing
so will damage the boiler and void the warranty.
All the Navien NCB-E boilers come with a factory-installed,
3-pronged (grounded) plug. The boiler can be plugged into any
grounded electrical outlet nearby, as it requires only 2 Amps. It is
not necessary to run a dedicated electrical line to the boiler.
If local codes require the boiler to be wired directly, remove
and discard the factory-installed plug. Install a power switch
between the breaker and the boiler to facilitate end-user
maintenance and servicing. Connect the boiler to a 110-120V AC
at 60 Hz with a maximum of 2A.
The boiler must be electrically grounded. If using the power
plug, ensure that the electrical outlet you connect the boiler
to is properly grounded. If wiring the boiler directly to a power
supply, do not attach the ground wire to either the gas or the
water piping as plastic pipe or dielectric unions may prevent
proper grounding.
Connecting the Power Supply
50
We recommend using a surge protector to protect the boiler
from power surges.
If there is a power failure in cold weather areas, the freeze
prevention system in the boiler will not operate and may
result in freezing of the heat exchanger. In cold weather areas
where power failures are common, you must completely drain
the boiler to prevent damage if the power will be off for any
extended period of time. A battery back-up (available at most
computer retailers) may be used to supply hot water during
periods of power outages. Damage caused by freezing is not
covered under warranty.
CAUTION
Label all wires before disconnecting them when you work on
the controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.