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MAINTENANCE
• A replacement ECO (available by
calling the number in the "REPAIR
PARTS LIST" on page 33). A busi-
ness card to check the gap between
the ECO and tank.
• Tape and a permanent marker to
mark the wires
• A flat blade and a Phillips screw-
driver
Steps for Replacing the
ECO:
Turn the power OFF at the
1
circuit breaker or remove
fuses.
NOTICE: It is not necessary to drain the
tank to replace an ECO.
Open the electrical junc on box
2
the side of the water heater.
Using a non-contact circuit
tester, check the power wires to make
certain the power is OFF.
Junction Box
Green Ground Screw
Green
Ground
Wire
Black Wire
Red Wire
Figure 43 - Non-Contact Circuit Tester
Remove the upper access
3
panel on the water heater and
carefully fold back the
insula on and plas c element/ECO
cover (see Figure 40).
Make sure the replacement
4
ECO matches the original ECO.
Mark the wires with tape so
5
you'll know how to put them
back on.
Disconnect the wires from the
6
bad ECO and remove the ECO
from the metal moun ng clip.
Install the new ECO in the
7
metal moun ng clip.
Make sure the new ECO fi ts
8
snuggly against the tank. You
should NOT be able to slip a
business card between the ECO and
the tank. If you can, bend the ECO
moun ng clip un l the ECO fi ts ghtly
against the tank.
A ach the wires following the
9
wiring diagram on the water
heater's label. Make sure all
wire connec ons are ght.
Replace the plas c element/
10
ECO cover, insula on, and
access panel.
Replace the cover on the
11
electrical junc on box.
Restore power to the water
12
heater. It may take two hours
1/2" Conduit
for the tank to heat up.
Opening
Power Supply
Connector
Figure 44 - Element Access Panel/ECO
Compartment
Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide • 31
T&P Relief Valve Main-
tenance
Read and follow the opera ng and
annual maintenance instruc ons
provided by the manufacturer of the
T&P Relief Valve (yellow label a ached
to T&P Relief Valve). Minerals in the
water can form deposits that cause
the valve to s ck or create blocked
passages, making the T&P Relief Valve
inopera ve. Follow these guidelines:
• At least annually, operate the T&P
Relief Valve manually to ensure the
waterways are clear and the valve
mechanism moves freely (above).
Before operating the valve manu-
ally, check that it will discharge in a
place for secure disposal. If water
does not flow freely from the end
of the discharge pipe, turn OFF the
power to the water heater. Call a
qualified person to determine the
cause.
WARNING! Hot water will be
released. Before opera ng the T&P
relief valve manually, check that it
will discharge in a safe place. If water
does not fl ow freely from the end of
the discharge pipe, turn the power to
the water heater OFF. Call a qualifi ed
person to determine the cause.
T&P Relief Valve
Figure 45 -
• At least every five years, have a
qualified person inspect the T&P
Relief Valve and discharge pipe.
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