Mosa CD4R90119003, Use And Maintenance Manual

02/06/10 M2-6_(raf

f_acqua)_EN

ENGLISH

ENGLISH

For open gensets installed indoors, we recommend:

• 

The dimensions of the air outlets be such that they have 

at least the same area of the radiator;

• 

the dimensions of the windows for air outlet is at least on 

the surface of the radiator.

• 

The dimensions of the air inlets be such that they have at 

least the same area of the ra10% for gensets up to 

130 kVA or +25% for gensets beyond 130 kVA;

For canopied gensets installed indoors, we recommend:

• 

The dimensions of the air outlets be such that they have 

at least the same area of the generator air outlets, as indi-

cated at page M2.7 of the present manual; 

• 

The dimensions of the air inlets be such that they have at 

least the same area of the generator air inlets, as indica-

ted at page M2.7 of the present 10% for gensets 

up to 130 kVA or +25% for gensets beyond 130 kVA;

The opening area has to be calculated considering protection 

grill surface, in order to insure that remaining free area is suf-

ficient.

Dimensions of openings calculated as above indicated, are 

the minimum acceptable dimensions in case of L.T.P. use; the 

pressure remaining after radiator and back pressure must be 

considered while planning dimensions of the piping.

To calculate the opening section check below drawing:

WarninG:

 to avoid reflux of heated air and loss of load, add 

an air duct between radiator and opening.

To consider the correct quantity of heat to be discharged, loss 

of heat on duct should be evaluated. If the duct is not appro

-

priately insulated, room-temperature may increase considera-

bly, for this reason it may be necessary to install an electro 

ventilator for correct air exchange.

a

Radiator surface

b

Free opening

c

Air flow opening with grill and 80% of open 

surface

d

Air flow opening with baffle plates

Electro ventilator capacity can be calculated as follows:

       attention

exhaust piping may reach up to 600 °c during opera-

tion, therefore it is compulsory to cover piping with ap-

propriate insulation.

!

Fan Capacity  

[

m

3

/h

]

=     Transmitted heat 

[

Kcal/h

]

        0,287 

x

∆

t  

[

°C

]

Considering:

• 

heat to radiation is indicated on engine/alternator technical 

data sheet;

•  0. 287 is specific heat for each m3 of air at 20°C;

•  Δt in °C is usually considered as equal to 5 °C (worst 

conditions are considered).

exhaust pipinG

Exhaust piping must be built in accordance to laws in force in 

the country of installation.

General indications:

•  Minimum required thickness: 2.0 mm;

• 

Diameter of piping has to be calculated considering, length, 

number of bends, type of exhaust muffler, and any other 

accessory used on it.

 Back pressure should not exceed 

values provided by manufacturer, as this causes loss 

of power and damage to the engine.

danGer

engine exhaust gas contains carbon monoxide, harmful 

to health and in large quantities can cause intoxication 

or death.

• 

Exhaust piping should be composed of parts, connected 

by flanges with gaskets, for easy disassembling and grant 

maximum tightness.

•  Exhaust piping should be connected to engine by a flex that 

should absorb dilatation and separate fix part from engine 

piping.

•  Exhaust piping should not weigh on engine manifold.

!

REV
.0-06/10

M

2.6.3

InstallatIon advIces

18