46 Installing the Water Heater
●
The water heater must be electrically grounded.
If using the power plug, ensure that the electrical
outlet you connect the water heater to is properly
grounded. If wiring the water heater directly to
a power supply, do not attach the ground wire
to either the gas or the water piping as plastic
pipe or dielectric unions may prevent proper
grounding.
●
We recommend using a surge protector to
protect the water heater from power surges.
●
If there is a power failure in cold weather areas,
the freeze prevention system in the water heater
will not operate and may result in freezing of
the heat exchanger. In cold weather areas where
power failures are common, you must completely
drain the water heater to prevent damage if the
power will be off for any extended period of time.
A battery back-up (available at most computer
retailers) may be used to supply hot water during
periods of power outages.
Damage caused by
freezing temperatures due to power loss is not
covered under warranty
.
If you are not using your water heater for an
extended period:
1. Completely drain the water out of the water
heater.
2. Disconnect the power supply to the water
heater. This prevents your water heater from
freezing and being damaged.
WARNING
Electric Shock Hazard
To prevent serious injury or death:
●
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.
Disconnect Switch (Outdoor Models
Only)
On outdoor models, there must be a disconnect
switch installed for the incoming 120 V AC power.
It should be designed to be suitable for outdoor
use. Make sure that you are in compliance with the
National Electrical Code, ANSI/NFPA 70, and your
local codes to ensure that you are using a proper
switch type for your area.
3.7 Setting the DIP Switches
The water heater has two DIP switch locations: on
the main circuit board (PCB) and on the front panel.
Each location has two sets of DIP switches that
control the functionality of the water heater. Set the
DIP switches appropriately, based on the installation
environment.
3.7.1 Circuit Board DIP Switches
The two sets of DIP switches on the circuit board
configure the water heater’s model settings. These
configurations are set at the factory and should not
be changed.
Summary of Contents for NHW700
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