Connecting The Power Supply - Navien NFC-250/175H Installation Manual

7. 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 water
●
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 NFC-H boilers are supplied with a
●
factory-installed, 3-pronged (grounded) plug. The
boiler's current rating is 12 A and can be plugged
into any grounded electrical outlet adjacent
to the boiler. A dedicated power supply is not
required.
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 15 A.
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 gas or water pipes
as plastic pipe or dielectric unions may prevent
proper grounding.
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 the heat exchanger
freezing. In cold areas where power failures are
common, you must completely drain the boiler to
prevent damage if power cuts last for extended
periods. A battery back-up (available at most
computer retailers) may be used to supply hot
water during power outages. Damage caused by
freezing is not covered under warranty.
If you are not using your boiler for a long period of
time:
1. Completely drain the water out of the boiler.
2. Disconnect the power supply to the boiler.
This prevents your boiler from freezing and being
damaged.
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.
Connecting the Power Supply 81