GSW JW727 JWF657 Draining, Flushing and Sediment Removal, Cathodic Protection, Hot Water Odour

Temperature and Pressure

Relief Valve

Manual Relief Valve

Discharge line to drain

Figure 12 T&P VALVE TEST.

WARNING! The temperature and pressure relief valve must be manually operated at least once a year. Caution should be taken to ensure that:

1.No one is in front of or around the outlet of the temper- ature and pressure relief valve discharge line.

2.The water manually discharged will not cause any bod- ily injury or property damage. The water may be

extremely hot.

If, after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water supply valve, drain the tank as directed in the “Draining and Flushing” section, and replace the tempera- ture and pressure relief valve with a new one. Failure to install and maintain an approved temperature and pressure relief valve will release the manufacturer from any claim that might result from excessive temperature or pressure.

Draining, Flushing and Sediment Removal

Some maintenance and service procedures require that the heater be drained and empty. The water heater should also be drained if being shut down for an extended period of time. Water may contain fine particles of soil and sand which set- tle to the bottom of a tank and thus form a layer of sediment. The action of the anode may also help to form sediment. If not removed, the heater could develop a tendency to pound, gurgle, or thump when heating up. It is recommended that the tank be drained and flushed on a regular basis to remove any sediment that may buildup during operation. To drain the tank and remove the sediment:

1.Turn "OFF" the electrical supply to the water heater.

2.Close the cold water supply valve.

3.Attach a hose to the drain valve and route to an adequate drain.

CAUTION! The water being drained can be extremely hot! The drain hose should be rated for at least 93°C (200°F). If the drain hose does not have this rating, open the cold water supply valve and a nearby hot water faucet served by the system until the water flow is no longer hot. Close the cold water supply valve and resume.

4.Open the drain valve using a flat-blade screwdriver. A nearby hot water faucet must be opened to allow the tank to be fully drained.

5.Open the cold water supply valve and flush the tank as needed to remove sediment and any other foreign mat-

ter that may have entered the system. Close the cold water supply valve when clean water flows.

6.If the heater is to remain empty for an extended period of time, it is suggested the drain valve be left open. When draining is complete, the hose may be removed.

7.Perform any other servicing as required.

8.Close the drain valve and disconnect hose.

9.Follow instructions for “Filling the Water Heater” and “Startup” when heater is ready to be put back into ser- vice.

Cathodic Protection

Your water heater has been equipped with one or more anodes that protect the glass-lined tank from corrosion and prolong the life of the water heater. Over time, as the anode(s) works, it slowly dissolves, exposing the steel inner core. Once the anode(s) is depleted, the tank will start to corrode, eventually developing a leak. Depending on water conditions, an anode(s) can last from one to ten years. Many localities treat their water and this can have a significant effect on the life of your heater. Water conditioning, such as over-softening, can accelerate the rate at which the anode(s) is consumed. As with any water heater, it is good practice to check the anode(s) annually to see if it needs replacing. Do not remove this anode(s) permanently as it will void any warranties, stated or implied. Rapid deple- tion or failure to maintain the anode can leave a heater unprotected and may result in premature failure of the heater due to corrosion and leaks.

This series of oil fired water heaters are factory equipped with 1 or 2 anodes, depending on the model. The JW717/ JW727 models are equipped with one heavy duty anode. Under normal circumstances, these anodes should last the life of the tank and need not be replaced.

Hot Water Odour

On occasion, and depending on your location, hot water may develop a strong odour. This can be especially prob- lematic in regions where the water contains sulphur, which results in hot water having a "rotten egg" odour. If this occurs, drain the system completely, flush thoroughly and refill the tank. If the water odour or discoloration persists, the anode(s) may need to be changed from magnesium to one made of aluminum. Aluminum anodes may reduce, but not eliminate, water odour problems. The water supply system may require special filtration equipment from a water condi- tioning company to successfully eliminate all water odour problems. In certain cases chlorinating and flushing of the water heater may be required. Contact your dealer or water supplier.

Discoloured Water

•Water rich in iron or other minerals can produce red or brown staining. Heating water generally worsens this sit- uation.

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