Maintenance Instructions; Maintenance - A.O. Smith HPI-40D User Manual

Maintenance instructions

Declaration
Before using the water heater, ensure it is filled with water and that the power plug has been
connected properly.
Warning
Electric shock: before repairing the water heater, be sure to disconnect the water heater from the
power source.
Declaration
Prior to repair works, please refer to the troubleshooting chart.

Maintenance

If the water heater needs to be serviced, close the water inlet valve, then open the drain valve. Rotate the
handle of the relief valve, release the nut connected to the water outlet joint of the inner tank and drain
the water from the discharge pipe.
It is recommended that the tank be flushed to remove sediments which may have built up during
operation. Specific operating procedures are as follows:
1. Disconnect the power.
2. Screw off the relief valve and remove the internal water inlet pipe of the water heater.
3. Connect the water outlet pipe connection of the water heater to the tap water pipeline and fill water
from this end. The water inlet pipe connection is connected to floor drain by pipes. Discharge water
from this end.
4. Open the water inlet valve to get the maximum tap water flow and flush the tank till the drained water
from the tank becomes clean.
5. Connect the water inlet and outlet pipes again and put the water heater to use after a leakage test.
Caution
The water in the tank might be very hot and may scald.
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