Kohler 3.5CFZ User Manual download pdf (Page 63)

TP-5695 12/93 Installation 6-1

Section 6. Installation

Introduction

Use this section as a guide when installing the Marine

generator set, then refer to Section 2. Operation for

specific service instructions. Reliable and safe

generator set operation depends largely upon proper

installation. Remember that the generator set will

probably be the craft’s sole source of electrical power.

When installing a marine generator set, it is

recommended that the installation comply with all

applicable Regulations and Standards. See Reference

Material for documents issued by governing agencies.

Information presented here should be followed in

planning and making installations. Specifications given

should be used only in initial planning. Use current

dimension drawings and wiring diagrams.

NOTE

A wood block is located under some generator set end

brackets to prevent damage during shipment. For the

same reason, metal brackets are used to attach some

generator sets to their wood shipping bases. These

items MUST be removed prior to installation in order to

provide adequate vibration clearance during generator

setoperation.Checkthatallpacking material, literature,

and loose accessories are removed from generator set

prior to operation.

Generator Selection and

Wattage Requirements

Total wattage requirements (lights, motors, appliances)

must be considered when selecting a generator set, or

when sizing wattage usage where available space and

construction limit the size of the generator set. The

4-lead reconnectable generator set can be connected

for 120 volt or 120/240 volt 60 Hz (110 volt or 110/220

volt 50 Hz), see Section 5. Wiring Diagrams.

NOTE

When a generator set is reconnected to produce a

voltage different than nameplate voltage, notice should

beplacedontheunitindicatingthischange.Decals(part

number 246242) for this purpose are available from

authorized Kohler dealers/distributors.

Lighting Load

The lighting load is usually easiest to calculate. In most

cases, simply add the wattage of each lamp to be

operated off the generator set. Note that in many

applications, not all of the lights or lamps are in the

generator set AC circuit—some are DC powered by the

12-volt battery in the craft. Make sure the total includes

only lights actually on the generator set AC circuit.

Motor Loads

When figuring generator set capacity requirements that

include electric motors, donot overlookthe highcurrent

demanded by the motors during start-up. The in-rush or

starting current is typically 2--3 times higher than that

required when the motor reaches normal operating

speed. Reserve capacity must be allowed for in-rush

demands plus other loads which could be onthe lineas

the electric motor starts.

Air conditioning units are perhaps the most common

type of motor load for generator sets in marine

applications. The starting characteristics of the different

varieties of airconditioners vary greatly—one particular

12,000 Btu unit has, for example, lower starting

requirements than a 10,000 Btu unit of another make.

When only one unit is involved, there is usually no

starting problem, provided the lighting and appliance

load is not too high when the unit is started.

Simultaneous starting of two air conditioning units,

however, can present problems if the capacity is

marginal. Because of the variation in starting

characteristics of the various makes of air conditioners,

no definite statements are made in this publication

regarding multiple-motor starting capabilities of the

marine generator set covered. Delayed starting or use

of easy-starting devices on air conditioner units should

be considered whenever simultaneous starting of more

than one motor is involved.

The starting and running requirements of some motor

loads common to marine applications are listed in

Figure 6-1;usethisasaguidewhenselectinggenerator

set capacity requirements involving motor loads. See

Figure 6-2 for generator set capabilities regarding air

conditioners.

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Kohler 3.5CFZ User Manual Page 63

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