A SERVICE OF

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2GENERAL DESCRIPTION
T
HERMO
90 / 90 S
2-2
1 Combustion Air Fan
2 Fuel Connection
3 Temperature Sensor
4 Temperature Limiter
5 Heat Exchanger
6 Inlet, Coolant
7 Circulation Pump
8 Outlet, Coolant
9 Outlet, Exhaust
10 Inlet, Combustion Air
11 Control unit (may
also be located
remotely in the
vehicle)
Heater Thermo 90 S
2.1 Combustion Air Fan
The combustion air fan delivers the air required for
combustion from the combustion air inlet to the burner
insert.
2.2 Heat Exchanger
The heat exchanger transfers the heat provided by
combustion to the coolant circuit.