Navien NCB-24LSWE, Service Manual

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8 NCB Service Manual Version 1.0
DANGER
IMPORTANT SAFETY PREAUTIONS

Read the safety information before
operating or servicing Navien
boilers.

Confirm the location of the gas
shut-off valve. During servicing,
close the manual shut-off valve if
the boiler overheats or is subjected
to fire, flood, physical damage or
other similar conditions.

DO NOT turn on the boiler unless
the water and gas supplies are
connected and supplied.

DO NOT turn on the boiler if the
main water supply valve is closed.

Ensure the boiler’s power supply is
isolated before removing the front
cover.

Label all wires prior to
disconnection. Wiring errors can
cause improper and dangerous
operation. Test and verify that the
boiler operates safely and correctly
after it is serviced or repaired.

Incorrect adjustments,
modifications, servicing or
maintenance can cause property
damage, personal injury, or death.

To prevent scalding, always check
the hot water temperature when
servicing is completed.

DO NOT change the water
temperature while the boiler is in
use.

DO NOT use parts other than those
specified for the boiler.

DO NOT allow children to operate
or handle the unit.
WARNING
GAS TYPE and POWER SUPPLY

This default gas supply
configuration for this boiler is
Natural Gas. If it is converted to
Propane Gas, the conversion kit
supplied with the boiler must be
used.

The power supply must be 230
VAC, 50 Hz. Voltages that are
abnormally high or low may affect
operation and reduce the life of the
boiler.
If the gas or power supplies do not
match the specifications do not
connect the boiler. Contact Navien
for assistance.