A SERVICE OF

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8SERVICING
T
HERMO
90 / 90 S
8-2
NOTE:
The manufacturer mounts the
control unit of Thermo 90 S
heater to the combustion air fan.
1 Heat Exchanger,
Vehicle Heating System
2 Blower Switch,
Vehicle Heating System
3 Relay for Vehicle System
4 Timer
5 Fuse Box in Vehicle
6 Check Valve with Drain Hole
7 T-Junction
8 Vehicle Engine
9 Heater Unit
10 Circulation Pump
11 Engine Coolant Pump
12 Radiator
13 Regulating Valve
14 Control Unit
15 Exhaust Muffler
16 Fuel Dosing Pump
17 Combustion Air Intake Line
18 Thermostat
With Check Valve and Thermostat
Without Check Valve
Fig. 8-1 Examples for Heater Installation