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PowerTech PTRV Manual

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GENERATOR COMPARTMENT SIZE
In planning the size of the generator compartment allow for the minimum clearance of one (1)
inch necessary to adequately cool the generator set. The thickness of insulation and sound deadening
material used to line the compartment must be taken into consideration when planning this clearance. To
maintain minimum clearance it may be necessary to enlarge the compartment.
NOTE: For Gensets mounted inside an enclosure please refer to the section on “Generator Enclosures”
for additional information and mounting requirements.
The generator set must be securely fastened to avoid unwanted movement from vibration and
road shock. If the unit is equipped with a mounting tray the tray is usually supported with structural
framing. Be sure to use all mounting holes in the tray to secure the tray to the structural framing. Units
not equipped with mounting tray are secured by attaching Genset mounts (two front and two rear)
directly to the structural framing. Skid mounted units can either be affixed to a tray for tray mounting or
attached directly to the structural framing. The generator is easily moved in and out of the coach by
incorporating a slide rack carriage with rollers into the structural framing. When designing the
compartment allow sufficient access for routine maintenance and for removal when major service is
required. Also keep in mind that the compartment or door must have an air intake opening equal to or
greater than that specified under the “Air Requirements” section of this manual. Make sure that the
compartment is vapor tight and completely sealed off from the inside of the vehicle to prevent any
hazardous fumes from entering the vehicle. Avoid road splash and the possibility of igniting
combustible materials beneath the coach by enclosing all unnecessary free space beneath the generator
compartment.
Line the compartment with a good sound deadening material. The material selected must be
fireproof or highly fire resistant. 3-layer foam sound mat is very efficient for absorbing generator noise.
This type of material is easily cut to size and can be quickly installed using the appropriate fire resistant
adhesive. Other materials such as fiberglass insulation with heat barrier may also be used.
NOTE: Since a Genset is flexibly mounted the minimum clearance of one (1) inch will assure that the
unit will not rub the sides of the compartment while the unit is in operation or while the vehicle is in
transit.
COMPARTMENT FRAMING
The generator must be bolted to a structural frame, which is either bolted or welded to the frame
of the vehicle. This structural frame must be designed to withstand a minimum force of 5Gs in any
direction. The structural frame must support the entire outer perimeter and center section of the unit’s
base. Additional framing may be required if excessive movement or vibration occurs.
AIR REQUIREMENTS
Each Genset is equipped with a high ambient temperature shutdown switch and a high water
temperature shutdown switch, which will automatically shut down the Genset if the ambient temperature
or water temperature rises too high. To prevent the generator set from shutting down make sure the
compartment openings are large enough to allow adequate circulation of cooling air. The minimum free
air opening into the compartment is 400 sq. in. or 2580 sq. cm. Remember that louvers, screens and
protective grills will restrict airflow. A relatively open mesh screen can restrict airflow by as much as
45%. The intake opening will need to be increased in size to compensate for such restrictions.
NOTE: Ambient temperature is defined as the generators normal operating temperature within its
mounting area. In an RV application this area is referred to as a compartment or enclosure.
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