Installation Guide

SERVICE
28 • Electric Tankless Water Heater
Replacement” (page 22).
G.) Reinstall the inlet and outlet water
lines to the water heater.
H.) Go to step 7.
6
Two- or four-chamber water
heaters only:
Drain the two- or four-chamber water
heater:
A.) Remove all six screws that secure
the access plate beneath the
element (at the bottom of the
water heater). See Figure 26.
B.) Remove the access plate and allow
the water to drain into the bucket.
C.) Clean the access plate and both
seals.
D.) Make sure that both seals are
seated properly, then reinstall the
access plate. (Use all six screws
that you removed earlier.)
E.) Repeat steps A through D for each
access plate.
F.) Go to step 7.
Figure 26.
Access Plates:
Two- or Four-Chamber models only
ĐĐĞƐƐWůĂƚĞ;ďŽƩŽŵŽĨŚĞĂƚĞƌͿ
ͻ dǁŽͲĐŚĂŵďĞƌŵŽĚĞůƐ͗
one access plate
ͻ &ŽƵƌͲĐŚĂŵďĞƌŵŽĚĞůƐ͗
two access plates
Returning the Water Heater to
Service
7
When you are ready to return
the water heater to service,
turn on the WATER supply to
the heater.
8
Turn on a nearby hot water fau-
cet to fill the heater with water.
Continue until all air has been
expelled from the heater and pipes. If a
T&P valve is installed, operate it
manually several times to allow any
trapped air to escape.
9
Check for water leaks. Correct
any leaks that are found.
NOTICE: Do not restore power until
the circuit board and components are
completely dry. If water has dripped
anywhere inside the heater, dry it with
a hair dryer or compressed air. Be sure
to dry behind the circuit board.
10
If there are no water leaks,
complete these steps:
A.) Two- or four-chamber models
only: Take the connector end of
the cover’s ribbon cable and plug
it into the control board. (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
model. (See “Wiring Diagrams” on
page 29).
NOTICE: If you have a two- or four-
chamber model, you must orient
the plug as shown in Figure 5, page
14. If you plug it in backwards,
it will not cause damage, but
the display will not work. If the
display does not work a er you
have completed installa on, 1.)
disconnect power at all branch
circuits, 2.) disconnect the plug, 3.)
rotate it 180-degrees, then 4.) plug
it back in.
B.) Reinstall the water heater’s cover.
WARNING! Be sure the cover is
reinstalled and secured to reduce
the risk of fire and electric shock.
C.) Restore power to the water
heater. Verify proper operation.
Replacement Parts
The following parts may be ordered
through your retailer or local plumbing
wholesaler:
• Heating Elements
• Thermistors
(temperature sensors)
When ordering replacement parts,
please be ready to provide your water
heater model and serial number.