Introduction; Scope And Purpose; Meaning Of Warnings, Cautions And Notes; Additional Documentation To Be Used - Webasto Thermo 90 Workshop Manual

T 90 / 90 S
HERMO
1.

Introduction

1.1

Scope and Purpose

This repair shop manual is intended to support
familiarized personnel in the repair of Thermo 90 and
Thermo 90 S coolant heaters.
The coolant heater may only be operated with the
specified fuel (Diesel 1, Diesel 2, Arctic grade, Kerosene
and certain military spec. fuels).
The coolant heater may only be operated within the
specified operating voltage range designated by type.
1.2 Meaning of Warnings, Cautions,
and Notes
Warnings, Cautions and Notes in this manual have the
following meaning:
This heading is used to highlight that
non-compliance with instructions or procedures may
cause injuries or lethal accidents to personnel.
This heading is used to highlight that
non-compliance with instructions or procedures may
cause damage to equipment.
This heading is used to highlight and draw specific
attention to information.
1.3 Additional Documentation to be
Used
This workshop manual contains all information and
procedures necessary for the repair of heaters Thermo
90 and Thermo 90 S.
The use of additional documentation is normally not
necessary. Operating instructions/installation instructions
and the vehicle specific installation guides (when
available) may be used as complementary information if
necessary.
WARNING
CAUTION
NOTE:
1.4 General Safety Regulations and
Information
The general safety regulations for the prevention of
accidents and relevant operating safety instructions must
be observed at all times.
The specific safety regulations applicable to this manual
are highlighted in the individual chapters by Warnings,
Cautions and Notes.
1.4.1

General Safety Notes

The heater may only be installed in motor vehicles, or in
independent heating systems, with a minimum coolant
capacity of 6 litres (1.6 US Gal.).
The heater must not be installed in the passenger
compartments of vehicles. Should the heater be
installed in such a compartment, the installation box must
be sealed tight against the vehicle interior. There must
be sufficient ventilation of the installation box from the
exterior in order not to exceed a maximum temperature
of 60 °C (140 °F) in the installation box. Excessive
temperatures may cause malfunctions.
Due to the danger of poisoning and suffocation, the
heater must not be operated in enclosed areas, such as
garages or workshops, without an exhaust venting
system, not even if the start-up is activated by the timer
or remote start device.
At filling stations and fuel depots the heater must be
switched off as there is a potential danger of explosions.
Where flammable fumes or dust may build up (e.g. in the
vicinity of fuel, coal, wood, cereal grain deposits or
similar situations) the heater must be switched off to
prevent explosions.
In the vicinity of the coolant heater, a temperature of
85 °C (185 °F) must not be exceeded under any
circumstances (e.g. during body paint work).
A violation of this temperature limit may cause
permanent damage to the electronics.
When checking the coolant level, proceed in accordance
with the vehicle manufacturer's instructions.
The coolant in the heating circuit of the heater must
contain a minimum of 10% of a quality brand glycol
based anti-freeze.
1 I
NTRODUCTION
WARNING
1-1