Hubbell Electric Heater Company WATER HEATER DF - Manual (Page 17)

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2. The burner manufacturer's installation and operation manual, included with this manual,
contains a detailed start up procedure that should be studied and followed precisely.
NOTE: Rated gas input for this water heater can be established by adjusting manifold gas pressure
to the value listed on the burner data plate. Rated oil input can be established by adjusting oil
pressure to the burner at 300 psi (pressure may have to be slightly reduced to obtain clean, smoke-
free combustion).
TEMPERATURE ADJUSTMENT
The upper operating control thermostat shuts off the burner when its temperature setting is reached.
The lower operating control thermostat can be adjusted to vary the temperature that activates the
burner. The unit is also equipped with a high limit safety control preset at 180°F. For energy efficient
operation of your water heater, the recommended upper temperature setting is approximately 130°F.
Facilities with small children or invalids may require a 120°F or lower temperature setting to reduce
the risk of scald injury. Some states require a lower temperature setting. Check with your gas
supplier for local requirements governing the temperature setting.
Remember that no water heating system will provide an exact temperature at all times. Allow a few
days of operation to determine the correct temperature setting consistent with your needs.
A lower temperature setting can cause condensation, but that does not mean your tank is leaking.
Many reported tank leaks on installation are proven to be condensation. To avoid unnecessary
inconvenience and expense, make sure the tank is leaking before calling a service person.