Commercial Electric Water Heater Use and Care Guide • 27
3
Remove the plastic element/
thermostat cover. O
pen the
lower access panel on the
water heater if replacing the lower
thermostat. Fold back the insulation
and remove the plastic element/
thermostat cover.
4
Make sure the replacement
thermostat matches the
original thermostat.
5
Mark the wires with tape so
you’ll know how to put them
back on.
6
Disconnect the wires from the
bad thermostat and remove
the thermostat from the metal
mounting clip.
7
Install the new thermostat in
the metal mounting clip.
8
Make sure the new thermostat
fits snuggly against the tank.
You should NOT be able to slip
a business card between the
thermostat and the tank. If you can,
bend the thermostat mounting clip
until the thermostat fits tightly against
the tank.
9
Attach the wires following the
wiring diagram on the water
heater’s label. Make sure all
wire connections are tight.
10
Replace the plastic element/
thermostat cover, insulation,
and access panel.
11
Close the upper access panel
to the electrical junction box.
12
Restore power to the water
heater. It may take two hours
for the tank to heat up.
T&P Relief Valve Maintenance
Read and follow the operating and
annual maintenance instructions
provided by the manufacturer of the
T&P Relief Valve (yellow label attached
to T&P Relief Valve). Minerals in the
water can form deposits that cause
the valve to stick or create blocked
passages, making the T&P Relief Valve
inoperative. 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 manually, 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.
•
After manually operating T&P
Relief Valve, remove any water in
the drain and wipe away any water
from the heater.
WARNING! Hot water will be
released.
Before operating the T&P
relief valve manually, check that it will
discharge in a safe place. If water does
not flow freely from the end of the
discharge pipe, turn the power to the
water heater OFF. Call a qualified
person to determine the cause.
Figure 38 -
T&P Relief Valve
• At least every five years, have a
qualified person inspect the T&P
Relief Valve and discharge pipe.
Damage caused by corrosive water
conditions, mineral deposits, or other
problems can only be determined
when a qualified person removes
and inspects the valve and its
components.
• Note that a dripping T&P Relief
Valve is usually caused by the water
pressure being too high or the lack of
a Thermal Expansion Tank. If your T&P
Relief Valve drips, see page 23.
MAINTENANCE
