Installation instructions
Legal Provisions for Installation
For testing the heater in accordance with articles 19, 20 or
21 of the StVZO the following regulations are primarily to
be observed (art. 22a StVZO):
NOTE:
These provisions are binding within the scope of the
StVZO and should also be observed in countries
where no speci al re gu la tions are in effect!
Within the scope of the S tVZ O (G er ma n Roa d Li ce nsin g
Regulations) “G en er al Desi g n Cer ti f ications” have been
granted by the Federal Office for Motor Traffic for the
Thermo Top
water heaters with the following design approval numbers:
~S 238 for the
Thermo Top
- Patrol heating device,
type BW 50
~S 239 for the
Thermo Top
- Diesel heating device,
type DW 50
The installation of th e he at er s must be pe rf or me d in accordance with these Installation Inst ructio ns. The insta llation must be checked
a) upon the homologat ion of th e veh i cles in acco rd an ce
with § 20 StVZO
b) upon any individual test in accordance wi th
§ 21 StVZO, or
c) upon any examination in accordance with § 19 StVZO
by a registered expert or examiner for mot or tra ff ic, 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 app ro val cer tificate contained on the design 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 certification is to be kept in the vehicle.
The year of the initial operation must be durably marked
on the type plate of t he hea te r by th e installer by removing
the years that do not apply.
Extracting the combustion air from the interior of the
vehicle is not permissible.
The exhaust pipe must be so mount ed tha t its disch ar ge
opening points downward, sideways or, in the case of routing the exhaust pipes on th e un de rsid e of the bottom of the
vehicle, their discharge ope ning must be positioned nea r
the lateral or rear edge of the driver’s cab or vehicle.
Exhaust pipes must be routed in such a way that exhaust
gases cannot penetrat e th e i nt er ior of th e veh icle. The
function of any parts of the vehicle essential 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 diameter cannot be introduced.
Electric lines, switchgear and controlgear of the heater
must be so arranged in the veh icle th at their proper function cannot be impaire d un der normal operating cond i tio ns.
For the routing of fuel lines and the installation of additional fuel tanks articles 45 and 46 of the StVZO are to be
adhered to. The most important excerpts therefrom are as
follows:
Fuel lines are to be designed in such a way that they remain unaffected by torsiona l stre sses in th e veh icle, engine movement and the l ike. The y must be protected
against mechanical damage. Fuel-carrying parts are to be
protected against excessive hea t an d ar e to be ar ra ng ed
such that any dripping or evaporating fuel can neith er collect nor be ignited by hot components or electrical equipment.
The heater must not be installed i n passengers areas.
The operating state of the heater at any given time - i.e. at
least an indication as to whether it is “on” or “off” - must be
easily recognizable.
The installation of com po ne nt s tha t ar e no t of an ap pr ove d
type will lead to the invalidation of the General Design Certification of the heater and thus the General Operating Permission of the vehicle. The same applies to improperly performed repairs or those where other than genuine replacement parts were used.
Use of the Water Heater
The Webasto
Thermo Top
water heater in conjunction
with the vehicle heating system is used fo r
- heating the driver’s cab,
- defrosting the vehicle’s windows as well as
- preheating water-cooled engines.
The water heater operates independently of the vehicle en-
gine and is connected to the cooling system, the fuel system and the electrical system of the vehicle.
Thermo Top
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