GSW WATER HEATING IV Operation, Temperature Adjustment, Draining and Flushing, Maintenance

IV) OPERATION						immediately. If it fails to reset completely and continues to
1.	Follow boiler or heat source installation and operating					release water, the valve is not functioning properly and must
	instructions.					be replaced immediately. Close the cold water supply valve,
2.	Fill the tank (see “FILLING” section).					drain the tank as directed in the “Draining and Flushing”
3.	The boiler or water heating source should be set to pro-					section, and replace the T&P valve with a new one. Failure
	vide at least 11°C (20°F) higher water temperature than					to install and maintain an approved T&P valve will release
	the temperature setting of the storage tank					the manufacturer from any claim that might result from
4.	Turn power on, check for proper operation of boiler and					excessive temperature or pressure. In systems where the
	storage tank.					relief valve discharges periodically, this may be due to ther-
						mal expansion or to a thermostat that is operating at too
Temperature Adjustment						high a temperature. If you suspect a malfunctioning thermo-
The setting of 49°C (120°F) has been proven to be satis-						stat, contact a qualified service technician for repairs.
factory from the standpoint of operational costs and safety.						Draining and Flushing
We recommend the thermostats remain set at 49°C
(120°F).						Some service work to be performed on the tank requires the
						tank to be drained. It is also recommended that the tank be
If water temperature adjustment is required:						drained and flushed every 6 months to remove any sedi-
1.	Turn "OFF" the electrical supply to the tank.					ment and lime which may build up in the bottom of the tank
2.	Remove lower access door.					during operation. Such buildup can result in noisy operation.
3.	Turn back insulation.					To drain the tank:
4.	Adjust thermostat to water temperature desired.					1. Turn "OFF" the electrical supply to the tank.
5.	Replace insulation and access door.					2. Close the cold water supply valve.
6.	Turn "ON" the electrical supply to the tank.					3. Open a nearby hot water faucet served by the system.
						4. Connect a hose to the drain valve and route it to an ade-
V) MAINTENANCE						quate drain.
T&P Valve Check						CAUTION! The water being drained can be extremely
						hot! The drain hose should be rated for at least 93°C
				CAUTION		(200°F). If the drain hose does not have this rating, open the
The out-flowing water is hot. Avoid splashing the water on						cold water supply valve and a nearby hot water faucet
yourself or on the surroundings where it may cause dam-						served by the system until the water flow is no longer hot.
age.						Close the cold water supply valve and resume.
						5. Open the drain valve and allow all the water to drain
Do not attempt to operate this storage tank with the cold
						from the tank.
water inlet valve closed. The Temperature and Pressure
						6. Open the cold water supply valve and flush the tank as
Relief Valve must be manually operated at least once a
						needed to remove sediment and any other foreign mat-
year. This involves opening the valve to check that it is flow-
						ter that may have entered the system. Close the cold
ing freely and that there are no blockages. WARNING!
						water supply valve when clean water flows.
WATER MAY BE HOT and water flow can be forceful.
						7. Perform any other servicing as required.
Caution should be taken to ensure that:
						8. Close the drain valve, disconnect hose and refill the
1.	No one is in front of or around the outlet of the T&P
						tank (see “FILLING” section).
	valve discharge line.
						9. Turn "ON" the electrical supply to the tank.
2. The water manually discharged will not cause any bod-
	ily injury or property damage. The water may be					Cathodic Protection
	extremely hot.					Your storage booster tank has been equipped with one or
While standing clear of the outlet (discharge water may be
						more anodes that protect the tank from corrosion. Over
hot), lift the lever and let it snap shut. The water should stop
						time, as the anode works, it slowly dissolves and must be
						replaced. If the anode(s) is less than 10mm (3/8 in.) in diam-
			Temperature and Pressure
			Relief Valve			eter, or has any of the inner steel core exposed, it must be
						replaced. Depending on water conditions, an anode can last
					Manual Relief Valve
						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. Rapid depletion
						can leave a heater unprotected causing a premature failure.
						It is good practice to check the anode(s) annually to see if it
						needs replacing. Operating a storage tank without an
						actively working anode(s) will void the warranty. Failure to
						maintain the anode may result in premature failure of the
		Discharge line to drain
Figure 5: T&P Valve Test						storage tank due to corrosion and leaks.
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