CUMMINS ED-3 Manual de instalación descargar pdf (Pagina 20)

Natural Gas Generator Set Installation Manual-GF Series

Doc. 17855, Rel. 03/2014

3-6

1. Exhaust Line

2. Condensation Trap

3. Valve Handle (shown in open position)

Figure 3-3 Condensation Trap

3.6 Air Fuel Ratio (AFR) Controller

Select model specific natural gas engines are

equipped with an air fuel ratio controller, and are

designed to meet emission requirements for EPA, SI,

and NSPS codes. The engines are also capable of

meeting NSPS emissions standards with an AFR

controller and factory supplied catalyst.

The AFR control system uses a O

sensor architec-

ture with catalyst, if applicable, to control exhaust

emissions. The AFR control system controls fuel flow

based on exhaust O

. The controller opens or closes

the fuel control valve (FCV) in the fuel line based on

feedback from the O

sensor(s).

3.7 Catalyst-Removable Elements (Only

available on some models)

Some Gensets require a 3-way or Oxidation catalyst

to meet emission requirements. There is a precious

metals element inside the housing of the catalyst that

converts exhaust to EPA requirements. Some cata-

lysts have a removable body that can be replaced

with a new element when required. Most catalysts

come installed on Genset from factory. Some cata-

lysts require customer mounting. Check with your dis-

tributor or service technician for details on your

product.

3.8 Engine 3-Way Catalyst (Model Spe-

cific)

The natural gas 3-way catalyst reduces the oxides of

nitrogen (NO, NO

), and hydrocarbons (HC) from the

natural gas exhaust. Read this manual before install-

ing, operating or servicing the engine equipped with a

natural gas catalytic converter.

The natural gas 3-way catalyst, when installed prop-

erly, meets state and local emission reduction

requirements on NO, NO

, CO, and HC as OEM

technology on stoichiometric natural gas engine.

Removal of these devices without prior approval from

the state and regulatory agencies can be constituted

as tampering.

CAUTION

Handle the natural gas 3-way catalyst with care.

Do not hammer or drop the unit. Do not weld or

drill holes in the body of the natural gas 3-way

catalyst without prior approval of Cummins® or

its distributors.

3.8.1 Installation and Applications Guidelines

The following are recommendations for installation

and application of natural gas 3-way catalyst for

select models of natural gas engines. It is recom-

mended that systems incorporating natural gas 3-way

catalyst be designed by, or in conjunction with

Cummins Engineering. In order to receive Cummins

approval of the 3-way catalyst installation, the instal-

lation shall meet the following requirements. (Excep-

tions to these requirements shall be approved by

Cummins Engineering.)

1. The 3-way catalyst and housing shall be the cor-

rect part number for the application.

2. The 3-way catalyst shall be mounted with a

mounting system strong enough to support both

the additional weight and dynamic loads.

3. It is recommended to use exhaust piping mate-

rial compatible with the 3-way catalyst housing

material, either cold-rolled steel or appropriate

grade of stainless steel.

4. The exhaust piping shall be supported sepa-

rately from the 3-way catalyst.

5. The 3-way catalyst is designed to be supported

by the piping to which it is attached. See Figure

3-4 and Figure 3-5.

NG-00039

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