62 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 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.
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.
7. Connecting the Power Supply
Summary of Contents for NFC-175
Page 122: ...Memo...
Page 123: ...Memo...
