Eberspracher Airtronic D5 Service Manual download pdf (Page 34)

34 | PRODUCT INFORMATION

3 | AIRTRONIC: INSTALLATION KITS

Additional hot air supply parts can be fitted to the heater. Each part has

a part guide number and thus reduces the flow of hot air. To give you

an opportunity to check whether your planned installation makes an

unacceptable reduction in the hot air flow, we have defined a unit guide

number for every heater and a part guide number for the hot air supply

parts, as stated in the guide number tables:

0 = no increase in temperature,

− = no part guide number.

The sum of part guide numbers of the hot air supply parts connected to

the unit must not be larger than the unit guide number, as otherwise the

outflow temperature will be unacceptably high with an uneven distribution

of heat so that the overheating sensor triggers. If the sum of part guide

numbers is larger than the unit guide number, the sum can be reduced

by choosing a larger diameter or by changing from a 1-duct to a 2-duct

system.

GENERAL INFORMATION ON THE HOT AIR SYSTEM:

RULE OF THUMB:

Double the cross section or 2 parts placed parallel = 1/4 of the guide

number.

Example:

Hose ø 60,

Cross-section area A = 19.6 cm

, guide number 1.0

Hose ø 75,

Cross-section area A = 44.2 cm

, guide number 0.25

For smooth, welded pipes, the part guide number is only half of the flexible

pipe with the same diameter (i.e. double pipe length).

1-duct means:

one hot air duct leads to or from the heater. The part guide numbers stated

for "1-duct" apply.

2-duct means:

After the heater, the hot air pipe line branches into two ducts. The part

guide numbers stated under "1-duct" apply up to the branching point,

while the part guide numbers stated under "2-duct" apply after the

branching point. Please comply with the instructions for the air system and

ascertaining the sum of part guide numbers from page 42.

In a 2-duct hot air system or when using several outflows, at least one duct

must be unlockable.

The lockable section must not be taken into account in ascertaining the

sum of the part guide numbers.

2-duct1-duct

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Eberspracher Airtronic D5 Service Manual Page 34

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