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7. Connecting the Power Supply
WARNING
Electric Shock Hazard
To prevent serious injury or death:
ALWAYS 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.
ONLY licensed professionals should connect
●
the power supply.
ALWAYS label all wires before disconnecting
●
them when you work on the controls.
Wiring errors can cause improper and
●
dangerous operation.
ALWAYS verify proper operation after
●
servicing.
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.
The boiler must be connected to a dedicated
●
110-120V AC power supply with circuit breaker.
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 NHB-H boilers are supplied
●
with a factory-installed 5 ft (1.5 m), 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.
70
Connecting the Power Supply
CAUTION
Ensure that the power supply to the boiler is
disconnected to prevent injury due to electrical
shock.
If local codes require the boiler to be wired directly,
remove and discard the factory-installed plug. See
below for recommended procedures:
Cut the existing power cord about 2" below the
●
bottom of the cabinet. Dispose the power cord.
Open the front cover by unlocking the 4
●
provided latches to access the inside of the
boiler.
From inside the case, locate the BLACK (hot),
●
WHITE (neutral), and GREEN (wires) that are
connected to the disposed power cord. Cut
these wires as close as possible to the end of the
power cord where it is uninsulated.
These wires can be directly spliced with an
●
external power supply. Strip approximately 1/2"
of sheathing from each wire to expose the bare
wire.
Connect 110-120V AC power directly to the
●
exposed wiring using field supplied twist-on
wire connectors (or wire nuts).
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.
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