Operation Burner Flames, Emergency Shut Down

V)OPERATION Burner Flames

Inspect the burner flames through the viewport and com- pare them to the drawings in Figure 14. A properly operat- ing burner should produce a soft blue flame. Blue tips with yellow inner cones are satisfactory. The tips of the flame may have a slight yellow tint. The flame should not be all yellow or have a sharp blue-orange color. Contaminated air may cause an orange colored flame. Contact a qualified service technician if the flame is not satisfactory.

TIPS MAY HAVE

A YELLOW TINT

YELLOW INNER
CONES ARE
CONES ARE		INCORRECT
SATISFACTORY		FLAME LAZY
		YELLOW

	CORRECT FLAME
	SOFT BLUE

Figure 14 Flame Characteristics

Emergency Shut Down

Important: Should overheating occur or the gas supply fail to shut off, turn off the water heater’s manual gas shut-off valve and call a qualified service technician.

Checking the Draft

After successfully lighting the water heater, allow the unit to operate for 15 minutes and check the drafthood relief open- ing for proper draft. Pass a match flame around the relief opening of the drafthood as shown in Figure 15. A steady flame drawn into the opening indicates proper draft. If the flame flutters or is blown out, combustion products are escaping from the relief opening. If this occurs, do not oper- ate the water heater until proper adjustments or repairs are made to the vent pipe system.


MATCH		R E L I E F
		OPENING

Figure 15 Checking The Draft

Operating Conditions

Condensation

Moisture from the products of combustion condenses on the tank surface and forms drops of water which may fall onto the burner or other hot surfaces. This will produce a “siz- zling” or “frying” noise. This condensation is normal and should not be confused with a leaking tank. Condensation may increase or decrease at different times of the year. Highly efficient energy saver water heaters will produce larger amounts of condensation on initial start up or when a large amount of hot water is being used. Once the water reaches a temperature of 49°C (120°F) and the tank warms up (usually about 1 hour), the condensation will stop.

Note: At initial start-up, in certain extremely cold conditions

and if the water heater is not allowed enough time to reach the room temperature, the pilot burner might be extin- guished in the first 20 minutes from start-up due to heavy condensation. In this situation if the unit is relit, it will follow its normal heating cycle without further incidents. After installation always allow the water heater to reach the room temperature before the initial start-up is initiated. Supervise the flame inside the water heater at least 20 minutes at ini- tial start-up to ensure that heavy condensation is not turning off the water heater.

Water Heater Sounds

During the normal operation of the water heater, sounds or noises may be heard. These noises are common and may result from the following:

•Normal expansion and contraction of metal parts during the periods of heat-up and cool-down.

•Condensation causing sizzling and popping within the burner area.

•Sediment build up in the tank bottom creating varying amounts of noise. Build up may cause premature tank failure. Drain and flush the tank as directed under “Draining and Flushing”.

Safety Shut-off

This water heater is designed to automatically shut-off in the event of the following:

•The pilot flame is extinguished for any reason.

•The water temperature exceeds 93°C (200°F).

•Excessive combustion chamber temperatures.

•The ignition of flammable vapors.

A thermocouple is used to determine if a pilot flame is pres- ent and will shut off the gas supply to the main burner and the pilot burner if the flame is absent.

A dual safety switch is part of the water heater safety sys- tem. The gas control is connected to a door-mount manual ly resettable safety switch which is designed to disable the gas control/thermostat in the event of excessive combustion chamber temperatures or a flammable vapor incident. If the thermal switch opens, the water heater cannot be used unless this thermal switch is reset by a qualified service technician.

The gas control has a high temperature limit switch or ECO (Energy Cut Off) which is used to shut off the unit if the water temperature exceeds 93°C (200°F). The ECO is a single use switch and requires complete replacement of the entire gas control/thermostat. If the ECO should function, the water heater cannot be used until the gas control/ther- mostat is replaced by a qualified service technician. Contact your local dealer for service information.

Anode/Water Odour

Each water heater contains at least one anode, which will slowly deplete while protecting the glass-lined tank prolong- ing the life of the water heater. Certain water conditions may cause a reaction between the anode and the water. The most common complaint associated with the anode is a “rot- ten egg smell” produced by the presence of sulfur. Do not remove this anode permanently as it will void any war- ranties, stated or implied. An aluminum anode may reduce

– 18 –

72090 specifications

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