Heat-Flo 115-D, Installation, Operating And Servicing Instructions, Page: 24 / 32

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ABOVE ALL, DO NOT PLUG THE TEMPERATURE AND PRESSURE RELIEF VALVE. THIS IS NOT A
SOLUTION AND CAN CREATE A HAZARDOUS SITUATION.
3. Sediment (Annual except where harsh water quality may require more frequent service)
•
Depending on water conditions, a varying amount of sediment may collect in the tank.
Levels requiring service are indicated by a small temperature difference between the
boiler supply and return lines, and a reduced recovery rate. Repeated flushing usually
clears such material. As a preventive measure, water should be drawn from the drain
valve until it runs clear and the installation of a water filter should be considered.
4. Scale (Annual)
•
Hard water may cause scale buildup on the outside of the heating coil inside the tank. A
water softener will prevent this problem. Symptoms are identical to sediment buildup. If
repeated flushing does not resolve the problem, chemical cleaning may be required.
Proceed as follows:
CHEMICAL CLEANING OF THE HEATING COIL
1. To avoid water damage, shut off the cold water supply to the water heater.
2. Make a note of the temperature control setting on the water heater, and turn off the
power to the water heater.
3. Relieve the water pressure in the tank by opening a hot water faucet. This will reduce
the risk of scalding.
4. Remove the relief valve from the water heater.
5. Drain the water heater until the water is at a level equal to 3” above the thermostat
well. This level will cover the coil and the thermostat.
6. Using a funnel, pour one gallon of commercial ice maker cleaning solution into the
tank through the relief valve opening. Follow the instructions, cautions, and warnings
supplied with the cleaning solution.
7. Turn on the power to the water heater, and allow the boiler to heat the water until
the tank thermostat is satisfied. The boiler may cycle on its high limit several times
during this period. If the tank thermostat is not satisfied after 45 minutes of boiler
operation, turn the thermostat to its lowest setting.
8. Allow the heated solution to set in the tank 30 minutes.
9. Drain the tank completely using fittings and hoses, as required, to reach a drain.
10. Fill the water heater tank with fresh, cold, water and drain it completely. Repeat filling
and draining at least three (3) times to flush all of the cleaning solution from the tank.
11. Reinstall the relief valve and the drain piping.
12. Open the cold water supply and fill the tank with water. Purge the air from the tank
and the piping by opening the cold and hot water faucets in the house.
5. Inspect Anode (annual)
•
The purpose of the magnesium anode is to reduce the damaging effects of aggressive
water on the water heater. Aggressive water will cause the anode(s) to erode. The
anode(s) must be inspected at least annually to determine whether a new anode should
be installed. Use anode replacement parts supplied by Heat-­‐Flo only. Heat-­‐Flo anodes
are 1-­‐1/4 NPT and are made with magnesium, brass, and stainless steel. There is no steel
in a Heat-­‐Flo anode. Severe or rapid deterioration of the anode indicates very aggressive
water. If this occurs, have the water tested to verify whether it is within the limits