Natco ANSI Z 21.10.3, Service Manual

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DOMESTIC WATER CONNECTION
The domestic water connections must be installed in accordance to all local and national plumbing codes, or any applicable standard
which prevails. The inlet and outlet ports of the Super-E are 1" on 45 gallon models. On the 80 and 119 gallon models, the inlet and
outlet ports are 1 ½". On the cold inlet, (bottom left), install a 1" brass tee on 45 gallon models, or a 1 ½" tee on 80 and 119 gallon
models. On the run of the 1" brass tee, install with pipe sealant compound, a 1" brass drain cock or equivalent. Into the branch of the
1" or a 1 ½" brass tee, install a copper male adapter to match your copper plumbing system. For convenience, you may install a sweat
shut off valve and a union in the cold inlet piping to ease servicing in the future. If there is a back flow preventer, or any type of a no
return valve in the system, then you must install an additional tee here for a suitable potable hot water expansion tank. In the hot out-
let, (top left), install a suitable adapter to match the copper tubing of the plumbing system. A thermal trap or heat trap loop may be
installed here, to provide additional energy savings and prevent the thermal siphoning of domestic hot water. Refer to
pages 22 to 26
for typical installations.
NEW LOW WATER CUT-OFF
NORMAL OPERATION
A low water cut-off switch has been added to the Super-E to stop the possibility of dry firing the water heater and damaging the
internal heat exchanger. The low water cut-off switch will be activated when the water heater is completely filled and the LED light
becomes illuminated on the ECO/Vent Switch located on the front of the water heater.
FAULT CONDITIONS
STEP 1: Check for low water condition in tank.
If the water heater is not completely filled, the low water switch will not activate the water heater. During a low water fault, the control
board three digit LED display will show LOC and the ECO/Vent Switch LED light will begin to flash. It could take as long as 5 minutes
before the water heater will physically lock out during the water heater operation.
Remedy: Low water condition in tank.
Turn off the electric supply, make sure that the cold water supply is turned on and the water heater is completely filled with water.
Verify this by opening a hot water faucet, allowing the water to flow until all the air is removed and clear water is present. Turn the elec-
tric supply back on and manually reset the control.
STEP 2:
If the ECO/Vent Switch LED light is still flashing after step 1, check the low water cut-off switch for possible damage.
Remedy: Low water cut-off switch damage.
Make sure the low water cut-off is operating correctly by checking the voltage with an electric meter. You should see 24 volts AC
across the red and black lead of the connector from the wire harness. If the electric meter reads 24 volts indicating there is power to
the switch, the next step is to put a jumper across the two green leads of the connector. If the ECO/Vent Switch LED illuminates and
the water temperature LED is on, then the low water cut-off switch needs to be replaced.
STEP 3:
If the ECO/Vent Switch LED light is still flashing check the low water cut-off wire harness for possible damage or disconnected.
Remedy: Low water cut-off wire harness damage or disconnected.
Make sure that all the wire connections are connected properly, reference the water heater control diagrams in the Installation Manual
on page 18 and 19, make sure that the wire harness is not damaged. If the wire harness is damaged, replace the wiring harness (Part
Number 7000-857).
After completing steps 1 through 3 and the ECO/Vent Switch LED light is still flashing it will be required to trouble shoot the ECO switch
(see page 16 in the Installation Manual).
PAGE: 4
WARNING
DO NOT ALLOW THE WATER HEATERTO OPERATE WITH THE JUMPER IN PLACE. PERMANENT
DAMAGE TO THEHEATEXCHANGER COULD RESULT AND WARRANTYWILL BE VOID.
CAUTION
NEVER USE DIELECTRIC UNIONS OR GALVANIZED STEEL FITTINGS ON ANY DOMESTIC WATER
CONNECTIONS. USE ONLY COPPER OR BRASS FITTINGS. TEFLON THREAD SEALANT MUST BE
USED ON ALLCONNECTIONS.