Installation Guide
INSTALLATION
14 • Electric Tankless Water Heater
model. (See “Wiring Diagrams” on
page 29.)
If you marked the board and con-
nector during earlier steps, align
the marks when plugging the con-
nector in.
NOTICE: The plug must be ori-
ented correctly. If you plug it in
backwards, it will not cause dam-
age, but the display will not work.
If the display does not work a er
you have completed installa on,
follow these steps:
A.) Disconnect power at all
branch circuits.
B.) Disconnect the plug.
C.) Rotate the plug 180 degrees,
then plug it back in.
8. Reinstall the water heater’s cover.
WARNING! Be sure the cover is
secured to reduce the risk of fi re
and electric shock.
9. Turn on power to the water heater.
10. Verify proper operation.
(ampacity) and circuit breaker
ra ng/type are correct for this
water heater.
NOTICE: The electrical
requirements for your model are
listed in “Electrical Requirements”
which starts on page 8.
4. Connect the electrical service
as described in “Electrical
Requirements” (starting on page
8
).
There is a wiring diagram label on
the inside of your water heater’s
protective cover. See also “Wiring
Diagrams” on page 29 of this
manual.
5. Do the following:
□ Check all electrical
connections to make sure that
they are correct and secure.
□ Make sure that the
supply voltage, wiring
size (ampacity), circuit
breaker rating and type are
correct. (Refer to “Electrical
Requirements” which starts
on page 8).
□ Label all breakers/connections
to the water heater.
6. Ensure that all air has been
purged from the water lines by
opening several hot water fixtures
near the water heater. Run water
through the water heater until all
air is purged from the lines.
7. Two- and four-chamber models
only: Plug the connector end
of the cover’s ribbon cable into
the control board. See Figure 5.
(Plug it in where you see two rows
of header pins close together, five
pins in each row.) If necessary,
refer to the “DISPLAY” callout
in the wiring diagram for your
Operating instructions are listed
on page 15.
5
Test Water
Heater Operation
1. At nearby hot water faucets, turn
water on medium-low.
□ You should hear a “click” as
the heater’s relays engage.
□ You may hear a hissing or
crackling noise from the heat
exchanger after the unit begins
to heat water. This is normal.
2. Check water at the fixtures to
make sure that the water is being
heated.
NOTICE:
Your water heater includes on-board
self diagnos cs. If an error occurs, the
system’s feedback will help you iden fy
the issue. See “Troubleshoo ng” for
more informa on (page 17 or 19).
Ribbon Cable
Red Band
“TX” Label
on Board
NOTICE:
When plugging the display
(User Interface Module)
into the control board,
orient it as shown in this
graphic.
Ribbon Cable
Connector
Control Board
Figure 5.
Two- and four-chamber models only: