TEMPERATURE REGULATION

Short repeated heating cycles caused by small hot water uses can cause temperatures at the point of use to exceed the thermostat setting by up to 30°F (16.7°C). If you experience this type of use you should consider using lower temperature settings to reduce scald hazards.

HOTTER WATER CAN SCALD: Water heaters are intended to produce hot water. Water heated to a temperature which will satisfy space heating, clothes washing, dish washing, and other sanitizing needs can scald and permanently injure you upon contact. Some people are more likely to be permanently injured by hot water than others. These include the elderly, children, the infirm, or physically/ mentally handicapped. If anyone using hot water in your home fits into one of these groups or if there is a local code or state law requiring a certain temperature water at the hot water tap, then you must take special precautions. In addition to using the lowest possible temperature setting that satisfies your hot water needs, a means such as a mixing valve should be used at the hot water taps used by these people or at the water heater. Mixing valves are available at plumbing supply or hardware stores, see Figure

2.Follow manufacturer’s instructions for installation of the valves. Before changing the factory setting on the thermostat, read the “Temperature Regulation” section in this manual, see Figures 35 and 36.

Never allow small children to use a hot water tap, or to draw their own bath water. Never leave a child or handicapped person unattended in a bathtub or shower.

NOTE: A water temperature range of 120°F-140°F (49°C-60°C) is recommended by most dishwasher manufacturers.

The thermostat of this water heater has been factory set at its lowest position. It is adjustable and must be reset to the desired temperature setting to reduce the risk of scald injury. The mark ( ) indicative of approximately 120°F (49°C) is preferred starting point. Some Provinces may have a requirement for a lower setting.

Turn the water temperature dial clockwise ( ) to decrease

the temperature, or counterclockwise ( ) to increase the temperature.

Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the appliance.

FIGURE 35.

Temperature

Time to Produce 2nd & 3rd

Settings

Degree Burns on Adult Skin

VERY HOT= approx.160°F (71°C)

About 1/2 second

C = approx. 150°F (66°C)

About 1-1/2 seconds

B = approx. 140°F (60°C)

Less than 5 seconds

A = approx. 130°F (54°C)

About 30 seconds

= approx. 120°F (49°C)

More than 5 minutes

Lowest

- - - - - - - - - - - - - - - -

Setting = approx. 80°F (27°C)

FIGURE 36.

FOR YOUR INFORMATION

START UP CONDITIONS

CONDENSATE

Whenever the water heater is filled with cold water, some condensate will form while the burner is on. A water heater may appear to be leaking when in fact the water is condensation. This usually happens when:

a.A new water heater is filled with cold water for the first time.

b.Burning gas produces water vapor in water heaters, particularly high efficiency models where flue temperatures are lower.

c.Large amounts of hot water are used in a short time and the refill water in the tank is very cold.

Moisture from the products of combustion condense on the cooler

tank surfaces and form drops of water which may fall onto the burner or other hot surfaces to produce a “sizzling” or “frying” noise.

Excessive condensation can cause pilot outage due to water running down the flue tube onto the main burner and putting out the pilot.

Because of the suddenness and amount of water, condensation water may be diagnosed as a “tank leak”. After the water in the tank warms up (about 1-2 hours), the condition should disappear.

Do not assume the water heater is leaking until there has been enough time for the water in the tank to warm up.

An undersized water heater will cause more condensation. The water heater must be sized properly to meet the family’s demands for hot water including dishwashers, washing machines and shower heads.

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A.O. Smith FMD 50, FMD 40, FMD 30 Temperature Regulation, For Your Information, Start UP Conditions, Condensate

FMD 40, FMD 50, 315795-000 MH, FMD 30 specifications

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