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GSW 73992 User Manual

Page 19

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General

Do not attempt to repair water heater. Call your authorized

dealer for service. Shut off the electric power whenever the

water supply is turned off. Before calling for service, check

that:

1. The heater is properly filled.

2. The electrical supply has not been interrupted.

Draining,

Flushing and Sediment

Removal

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.

If not removed, the sediment could reach the heating ele-

ments and cause them to fail. It is recommended that the

tank be drained and flushed on a regular basis to remove

any sediment that may buildup during operation. 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.

To drain and remove the sediment from the tank:

1. Turn the electrical supply to the heater “OFF”.

2. Close the cold water supply valve.

3. Attach 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, disconnect hose.

9. Follow instructions for “Filling the Water Heater” and

“Startup” when heater is ready to be put back into serv-

ice.

NOTE: If the water heater is going to be shut down for an

extended period, drain the tank as directed in “Draining,

Flushing and Sediment Removal”. Ensure that the cold

water supply valve is closed and the drain valve left open.

T

emperature and Pressure (T&P) Relief

Valve Check

CAUTION!

THE WATER COMING FROM THE VALVE

MAY BE EXTREMELY HOT.

Manually operate the temperature and pressure relief valve

at least once a year to make sure it is working properly. To

prevent water damage, the valve must be properly connect-

ed to a discharge line which terminates at an adequate

drain. Stand clear of the outlet (discharged water may

be hot) and slowly lift and release the lever handle on the

temperature and pressure relief valve (see Figure 20) to

allow the valve to operate freely and return to its closed

position. If the valve fails to completely reset and continues

to release water, immediately turn “OFF” the power and

close the cold water inlet and call a qualified service techni-

cian.

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 signifi-

cant 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

depletion 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.

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.

FIGURE 20: T&P Valve Test

Temperature and Pressure

Relief Valve

Manual Relief

Valve

Discharge line to drain

VII) MAINTENANCE