Kohler 3.5CFZ, 4CZ, 5CFZ, 6.5CZ installation manual LocationVentilation, Space, Mounting

LocationVentilation

General

Consider the following in selecting or constructing a generator set location.

Compartment/location must allow adequate space for ventilation, cooling and exhaust system installation, service access to the engine and generator, and proper fuel system installation.

Engine stringers or other available structural members must provide adequate support for the generator set weight.

A generator set compartment must be sealed to prevent exhaust gases and fuel vapors from entering cabins.

Generator sets located above deck must have a protective cover to prevent damage from rain and water splash. This cover must not affect cooling air flow and serviceability.

See Figure 6-4 for a typical installation and Section 1. for dimensions and weights.

Space

Location should allow easy access to the generator set’s engine, controller, cooling, and fuel system components for routine service. Engine compartments are often ideal generator set locations, but access should not be obstructed by propulsion engines or generator and controller. Also allow clearance for vibration during operation. Minimum recommended clearance for vibration and cooling of top, front, rear, and sides of generator set is 1 1/2 in. (38 mm).

Mounting

Engine stringers generally provide the best support for a generator set. Any structural members considered for mounting must support the generator set weight and withstand engine vibration. The generator set includes vibration mounts and mounting trays; additional vibration isolating pads may be installed between trays and bases.

A generator set should be mounted as high as possible to avoid bilge splash and lower-lying vapors and also to allow downward pitch of the exhaust line. For angular installation, the maximum operation angle of the engine/generator set is 20_(in all directions).

Ventilation is required to support engine combustion, generator cooling, and expulsion of flammable and lethal fumes. Ventilation provisions must comply with U.S.C.G. Regulations governing sizing of vents and operator requirements.

As a rule, inlet and outlet vent areas should each be sized to a minimum of 2 sq. in. per ft. (13 sq. cm/30.5 cm) of craft’s beam. Should this rule in any instance conflict with U.S.C.G. Regulations, appropriate Regulations should be followed. If any screening is used in inlets, size of hull/deck openings should be doubled. Vent ducts should extend to bilges to expel heavier-than-air fumes. If the generator set is to be mounted in the engine compartment, air flow must be increased to allow for generator set’s requirements. UL-listed ignition- protected blowers should be installed in outlet vents, and wired to operate before engine(s) are started. Sniffer devices may also be optionally installed to cause alarm, warning, or engine shutdown should dangerous fumes accumulate in the compartment.

WARNING

Explosion.

Gasoline vapors can cause explosion and severe injury or death.

Before starting generator set, operate blower 4 minutes and check engine compartment for gasoline vapors.

Air requirements for various models are given in Figure 6-5. The air intake silencer provides combustion air to the engine. It is imperative that the recommended minimum clearance of 1 1/2 in. (38 mm) between duct opening and any enclosure wall not be compromised. Engine/generator performance will be affected adversely if these guidelines are not followed.

Air Requirements

CFM (L/min.)

Model	Combustion		Cooling
3.5CFZ	18 (510)	323	(9145)
4CZ	18 (510)	323	(9145)
5CFZ	18 (510)	600 (16988)
6.5CZ	18 (510)	600 (16988)

Figure 6-5. Air Requirements

6-4 Installation TP-5695 12/93