Installation Instructions
Legal Provisions for Installation
For testing the heater in accordance with articles 19, 20
oder 21 StVZO the following regulations are primarily to be
observed (§ 22 a StVZO):
NOTE:
These provisions are binding within the scope of the
StVZO (German Road Licensing Regulations) and
should also be observed in countries where no special
locally applicable regulations are in effect!
Within the scope of the StVZO (German Road Licensing
Regulations) “General Design Certifications” have been
granted by the Federal Office for Motor Traffic for the
Thermo 90 water heater with the following marks of appro-
val:
~
S231 for Thermo 90 heaters Petrol type BW 80
~
S232 for Thermo 90 heaters Diesel type DW 80 and
for Thermo 90-ADR heater Diesel type DW 80.
~
S299 for Thermo 90 S heaters Petrol type Thermo 90 S B
~
S298 for Thermo 90 S heaters Diesel type
Thermo 90 S D and for Thermo 90 S-ADR
heaters Diesel type Thermo 90 S D
The installation of the heaters must be performed in ac-
cordance with these Installation Instructions. The installa-
tion must be checked
a) upon the homologation of the vehicles in accordance
with § 20 StVZO
b) upon any individual test in accordance with
§ 21 StVZO, or
c) upon any examination in accordance with § 19 StVZO
by a registered expert or examiner for motor traffic, an
expert for automotive vehicles, or any other authorised
official, in accordance with paragraph 4 of
Appendix VIIIb to the StVZO
and in the case of item c) the proper installation must be
certified on the approval certificate contained on the de-
sign certification stating the following:
- vehicle manufacturer
- vehicle type and
- vehicle identification number
The effectiveness of the design certification (homologa-
tion) is dependent on this certificate. The approval certifica-
tion is to be kept in the vehicle.
The year of the initial operation must be durably marked
on the type plate of the heater by the installer by removing
the years that do not apply.
Extracting the combustion air from the interior of the ve-
hicle is not permissible.
The discharge opening of the exhaust pipe must point up-
ward, sideways or, in the case of routing the exhaust pipes
along the underside of the bottom vehicle, it must be lo-
cated near the lateral or rear edge of the driver’s cab or ve-
hicle. Exhaust pipes must be so routed that the possibility
of exhaust fumes entering the interior of the vehicle is
remote. The functioning of any parts of the vehicle essen-
tial for its operation must not be impaired.
The openings of the combustion air inlet and exhaust gas
outlet must be so designed that a spherical object of 16
mm in diameter cannot be introduced.
Electric lines, switchgear and control gear of the heater
must be so arranged in the vehicle that their proper func-
tioning cannot be impaired under normal operating condi-
tions.
For the routing of fuel lines and the installation of addi-
tional fuel tanks articles 45 and 46 StVZO are to be ad-
hered to. The most important excerpts therefrom are as fol-
lows:
Fuel lines must be designed in such a way that they re-
main unaffected by torsional stresses in the vehicle, en-
gine movement and the like. They must be protected
against mechanical damage. Fuel-carrying parts must be
protected against excessive heat and must be arranged
such that any dripping or evaporating fuel can neither col-
lect nor be ignited by hot components or electrical equip-
ment.
The heater must not be installed in rooms occupied by per-
sons.
The operating state of the heater at any given time – at
least an indication as to whether it is “on” or “off” – must
be easily recognizable.
Webasto will not assume any liability if the installation in-
structions and the notes contained therein are not ob-
served. The same applies to improperly performed repairs
or those where others than genuine replacement parts
have been used. In those cases, the heater’s General De-
sign Certification and thus the General Operating Permit
(homologation) will be invalidated as a consequence.
Use of the Water Heaters
The Webasto Thermo 90 water heater in conjunction with
the vehicle heating system is designed to provide the fol-
lowing features:
- heating the driver’s cab,
- de-frosting the vehicle’s windscreen as well as
- preheating of water-cooled engines.
The water heater operates independently of the vehicle’s
engine and is connected to the cooling system, the fuel
system and the electrical system of the vehicle.
Thermo 90 / Thermo 90 S
1
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