GSW JWF507, JWF657 manual Maintenance

V) MAINTENANCE

Do not attempt to repair your water heater. Call a qualified Oil-Burner Technician for service. Turn “OFF” the electric power whenever the water supply is shut off. Before calling for service, check that:

1.The heater is properly filled.

2.The electrical supply has not been interrupted.

Professional Maintenance

Except for external appearance and area tidiness, the fol- lowing steps should be performed only by a qualified Oil- Burner Technician.

1.Lift out the flue baffle to clean the flue. (On rear and combination flue heaters, the top cover, insulation and flue top cover must be removed.)

2.Insert a flue brush down the flue passage way(s) to remove soot and dirt. Soot or carbon that falls into the combustion chamber will burn up within a very short time.

3.In normal use, there should be no large accumulation of soot in the combustion chamber. If there is, remove the burner and carefully brush or vacuum the combustion chamber.

Flue Pipes

Once a year, inspect the flue pipe leading from the heater to the chimney. If corrosion is evident, or discolouration at the joints can be seen, replace the flue pipes. This should be done by a qualified Oil-Burner Technician. Flue pipes must be replaced by the same size flue pipe as the flue collar (breech connection) at the heater.

•Keep the air ventilation openings unobstructed. If dust and lint is seen accumulating around the openings, remove it.

•Do not pile cartons, papers, or combustible materials on top, or near the heater (see Figure 1).

Draining and Flushing

It is recommended that the tank be drained and flushed every 6 months to remove sediment that may build up dur- ing operation. The water heater should be drained if being shut down during freezing temperatures. To drain the tank, perform the following steps:

1.Turn off the electrical supply to the water heater.

2.Close the cold water inlet valve.

3.Open a nearby hot water faucet.

4.Connect a hose to the drain valve and terminate it to an adequate drain.

Note: 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 inlet valve and a nearby hot faucet until the water is no longer hot.

5.Open the water heater drain valve and allow all the water to drain from the tank. Flush the tank with water as needed to remove sediment.

6.Close the drain valve, refill the tank, and restart the heater as directed under “Water Heater Operation”.

If the water heater is going to be shut down for an extended period, the drain valve should be left open.

Important: Condensation may occur when refilling the tank and should not be confused with a tank leak.

Temperature and Pressure Relief Valve

Combustion Tests	Manually operate the temperature and pressure relief valve
Burner adjustments:	at least once a year to make sure it is working properly (see
	Figure 12). To prevent water damage, the valve must be
Final burner adjustments must be made using combustion
	properly connected to a discharge line that terminates at an
test equipment to assure proper operation. Do not fire
	adequate drain. Standing clear of the outlet (discharged
heater without water or sections will overheat.
	water may be hot), slowly lift and release the lever handle on
1. Refer to burner manual for start-up.
	the temperature and pressure relief valve to allow the valve
2. Allow heater to heat to design condition.
	to operate freely and return to its closed position. If the valve
3. Using combustion test equipment, adjust burner for:
	fails to completely reset and continues to release water,
a. CO2 between 11% and 12% and a trace of smoke
	immediately shut off the power to the heater and the cold
between No. 0 smoke and No. 1 smoke.	water inlet valve and call a qualified service technician.
b. over-fire draft -0.01 to -0.02 in. w.c. (-0.0025 to -
0.005kPa) draft in combustion chamber (+0.25 in.
w.c. (+0.062kPa) for JWF307V).
NOTE: For JWF307V also see additional “Installation
		Temperature and Pressure
Instructions for Through-the-wall Venting Components" that		Relief Valve
is supplied with the JWF307V.
			Manual Relief Valve
Routine Preventative Maintenance (by
owner/operator)
As a precaution against fire, and to maintain an adequate
flow of combustion air to the heater:
• Keep the appliance area clear and free from combustible

material, gasoline and other flammable vapors and liq-
uids.
			Discharge line to drain
		Figure 12 T&P Valve Test
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