Combination Water Heater / Heating Boiler - Navien CH-180 Installation Manual

Wiring:
The unit must be in OFF position before connecting the electrical wires.
Make sure the circuit breaker on the distribution panel is OFF or ON/OFF switch in
the Navien Combination Water Heater / Heating Boiler is OFF.
From the bottom of Navien combination combination Water Heater / Heating Boiler,
connect the 120 VAC.
When Room Thermostat needs external 24 VAC power, Navien Combination
Water Heater / Heating Boiler provides 24 VAC power for your convenience or
having external 24 VAC transformer.
Terminal for connecting Thermostat R and W not required any power.
It works as contact point.
It is advised that main supply voltage fluctuations are not to exceed 10 percent
of the nominal supply voltage.
It is specified that a switch or circuit-breaker shall be included in the building
installation, it shall be in close proximity to the equipment, and it shall be
marked as the disconnecting device for the equipment.
It is required to have insulation for external circuits to conform to the
requirements for protection against electric shock.
It is required to have over current protection devices when installed indoors.
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