Webasto Thermo 90 S-TRS Instructions d'exploitation

Water Heaters Installation InstructionsThermo 90Thermo 90-TRSThermo 90 SThermo 90 S-TRS(Transport of hazardous goods)Type BW 80 (Petrol), Type Thermo

Unique to Thermo 90-TRS: For legal provisions relatingto the routing of the exhaust pipe refer to Technical Infor-mation E3 - 5.10 (order no. 776 623)

Control Unit Thermo 90NOTE:Control units for the 12-volt variant are provided with red la-belling, those for the 24-volt variant with green labelling.

Legend for circuit diagrams:➀ this terminal is not used for petrol-operated heaters.➁ For temperature codification (temperature at water outlet) refer

Pos. Designation CommentA1 Heater Thermo 90/Thermo 90 SA2 Electronic control unitB1 Flame detectorB2 Temperature sensorB3 Temperature limiterB4 Interi

ϑϑFig. 16: System Diagram Thermo 90, 12 and 24V, with Digital Timer with 3 Time Settings, for legende refer to page 10 and 11Thermo 90 / Thermo 90 S12

ϑϑFig. 17: System Diagram Thermo 90-TRS, 24V, for legende refer to page 10 and 11Thermo 90 / Thermo 90 S13

ϑϑFig. 18: System Diagram Thermo 90 S, 12 and 24V, with Digital Timer (standard) ,for legende refer to page 10 and 11Thermo 90 / Thermo 90 S14

ϑϑFig. 19: System Diagram Thermo 90 S - TRS, 24V, for legende refer to page 10 and 11Thermo 90 / Thermo 90 S15

ϑϑFig. 20: System Diagram Thermo 90 S - TRS, 24V, without auxiliary drive, for legende refer to page 10 and 11Thermo 90 / Thermo 90 S16

Initial OperationAfter the heater has been installed, the water circuit andthe fuel supply system must be thoroughly bled. When sodoing, the vehicle m

Table of ContentsPageInstallation Instructions 1Legal Provisions for Installation 1Installation 2Installation Example 3Connection to the Vehicle’s C

MalfunctionsFault ShutdownIf the flame fails to materialize fuel is delivered for max.180 seconds.If the flame is extinguished during operation fuel i

Diagnosis in the Event of a Fault Shutdown of Thermo 90 Check fuses and electrical connections.If the heater is activated by the switch or the timer w

Technical DataUnless tolerances are shown within the technical datatable on the right, a tolerance of ± 10% applies at an am-bient temperature of +20°

Variants Thermo 90 Variants Thermo 90 SThermo 90 Petrol-Type(Type BW 80)Water heater for “petrol” fuelThermo 90 Diesel-Type(Type DW 80)Water heater fo

Thermo 90 / Thermo 90 S22

Template for heater mounting bracketScale 1:1Gabarit de perçage pour le support de l’ap-pareil de chauffageEchelle 1:1

Thermo 90 / Thermo 90 S24

Webasto Thermosysteme GmbH82131 Stockdorf . Kraillinger Str. 5 . Phone (089) 85794-0 Fax (089) 8 57 94-448 . Telex 5 23 647 webas d Subject to c

Installation InstructionsLegal Provisions for InstallationFor testing the heater in accordance with articles 19, 20oder 21 StVZO the following regulat

InstallationCAUTION:- The legal provisions on page 1, relating to the installa-tion of the heater, must be observed- When installing the Thermo 90-TRS

without non-return valvecable harnessfuel lineexhaust pipewater circuitwith non-return valve and thermostatFig. 3: Installation Examples for the Therm

Connection to the Vehicle Cooling SystemIn the case of thermostat circuits only thermostats thatopen at temperatures < 65°C should be used.The heat

Vehicles with Diesel EnginesFuel must be drawn from the fuel tank or a separate tank(see Figs. 5, 6 and 7). When fuel is supplied from a separ-ate tan

If the heater is installed in vehicles equipped with injectionsystems it is therefore to be determined whether the fuelpump is mounted inside or outsi

Installation and MountingThe metering pump is to be attached by vibration-dampingsuspension. The installation position is restricted in accord-ance wi