Hubbell Electric Heater Company WATER HEATER DF User Manual
Page 11
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LOCATION
NOTE: Do not run uninsulated water pipes in front of or directly above a fresh air opening. If an
exhaust fan is installed in the mechanical room, the combustion air inlet must allow for the fan's
exhaust air volume. An undersized opening may cause down drafts resulting in poor combustion,
sooting and carbon monoxide.
1. Position the water heater in a clean and dry location as close as possible to the greatest use of
hot water (and the oil storage tank if used). Minimum clearances for servicing are listed on a
label near the burner. Greater clearances may be required by local code.
2. An adequate uncontaminated air supply for combustion is needed. If air is directly obtained
from outdoors, a free area of 1 square foot per 1,000 CF/Hr
of input is required. If air is
obtained from an adjacent indoor area, 1 square inch per 1,000 BTU/Hr of input is required.
If oil-fired, 1 gallon per hour equals 140,000 BTU/Hr. Combustion air inlets should be
located on an outside wall, away from prevailing winds, and be sized to accommodate all fuel
burning equipment located in the mechanical room. Combustion air calculations should
assume simultaneous operation of all fuel burning equipment in the equipment room.
3. The water heater should not be installed in an area where combustible liquids or vapors may
be present that could be ignited by the burner. The installation area should not contain air
contaminated with chlorinated hydrocarbons, perchlorethylene or any strong oxidizing agent.
Combustion air containing these agents will seriously damage the burner and vessel parts
thus voiding all warranties. If required, combustion air should be ducted from outside the
building to avoid such contaminants. Burners require special construction for outside
combustion air applications. Consult factory for details.
4. The water heater should be located on a pitched floor near a suitable drain, or other
provisions must be made to prevent damage to areas of the building subject to water damage
should the heater or plumbing leak. A drain is required for relief valve discharge as well as
routine cleaning and flushing of the tank. The heater must be installed in a level position.
Shim under skids if necessary.
WATER CONECTIONS
NOTE: The most effective means for preventing deterioration from accelerated corrosion due to
galvanic and stray current is the installation of dielectric fittings/unions. The installation of these
fittings is the responsibility of the installing contractor.
Water connections are made to the cold water inlet and hot water outlet as shown on the supplied
water heater drawing. Dielectric fittings are provided to minimize the formation of galvanic
corrosion (some jurisdictions require the use of dielectric fittings). Shut-off valves and unions should
1
1,000 CF/Hr of Gas = 1,000,000 BTU/Hr = 7.14 GPH of #2 fuel oil