Armstrong World Industries ACUM140 VENTILATION 3.1. OUTDOOR INSTALLATIONS - AIR COOLED UNITS

AR-EXP-CUMMINS-07-00

Concrete foundations are typically mixed by volume.

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• The concrete base should extend beyond the genera- tor's "Footprint" by at least 12 Inches (305 mm) on all sides.

• The higher the mounting base is made, the easier the unit will be to work on when performing maintenance, service, or repairs. Typically bases are required to be raised at least 6 inches (153 mm) above floor level. Placing the unit higher than 6 inches sometimes has the advantage of making it easier to change the unit's oil.

• Passing fuel lines and electrical conduit for a "stub-up" through the concrete base is a standard practice of gen-set installers.

Double pedestals provide better access for inspecting for oil or fuel tank leaks.

A double pedestal base allows easier cleaning under most generator's.

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• The generator should be retained to the pedestal base with fasteners that are recommended by the generator set manufacturer.

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Figure 1- Single Pedestal Concrete Mount

Figure 2 - Double Pedestal Concrete Mount

The typical ratio of cement, sand, and aggregate is 1:2:3 with a maximum 4 inch (102 mm) slump and 28 day compressive strength of 2500 psi (173 kPa).

•A generator can typically be mounted to a combustible floor or roof, dependent upon code, however, the sur- face beneath the engine and beyond the engine to a minimum distance of 12 inches (305 mm) must be covered with a non combustible insulation and a mini- mum of 24 gage sheet metal between the insulation

and the generator. See Figure 3.

Figure 3. Combustible Floor and Roof

•Optional vibration isolators beyond those already built in the generator also help reduce transmitted noise, however, it is recommended that one verify that the generator manufacturer recommends the use of an isolator.

•Insulation must be a non-combustible material, typi- cally a Fiberglas mat.

3.VENTILATION

3.1.OUTDOOR INSTALLATIONS - AIR COOLED UNITS

If your generator is expected to be in temperatures lower than -20oF(-29oC) a cold weather package may be required.

The following general rules apply:

•Where strong prevailing winds are anticipated, face the engine end away from the wind.

•Plan the installation carefully to prevent the cooling air vents on the generator from becoming clogged by leaves, grass, snow, etc.

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