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3
Information regarding the
heater
3.1
Basis
The Thermo Top Pro 120 | 150 heaters consist essentially of the
following main components:
l Burner head (with fan, fuel pump, control unit)
l Combustion chamber
l Heat exchanger
A coolant pump (type U4850) is installed in the vehicle near the
heater and guarantees the required heat transport via the
coolant circuit.
A
B
C
P O N M L
Fig. 1 Overview of heater and connections
A Spray guard (optional)
B Burner head
C Electrical Connections
D Coolant outlet of heater
E Coolant temperature
sensors with cover
F Heat exchanger
G Coolant inlet of heater
H Coolant hose (inlet)
I
Exhaust gas temperature
sensor
NOTE
This workshop manual describes the retrofit version of
the heater. In the case of heaters installed directly by
the vehicle manufacturer, different control units with
different connectors and different software as well as
different application parts may be used which are not
described in this manual. For these heaters, information
is only available in the documentation of the vehicle
manufacturer.
9039412C Workshop manual TTP 120 _ 150
D
J Exhaust gas outlet
K Original vehicle coolant hose
(inlet)
L Fuel line
M Fuel hose clamp
N Fuel connector
O Seal
P Screw for fuel connector
Q Dummy connector for
coolant pump (for CPoff
variant)
3.2
Special variants (Rail, CPoff, Chiller,
ADR)
3.2.1
Thermo Top Pro 150 Rail
This is a heater model for installation and operation in rail
vehicles. The essential functions correspond to the standard ver-
sion of the heater.
3.2.2
Thermo Top Pro 120 | 150 CPoff
In the case of the "CPoff" variant, controlling and monitoring
the coolant pump is deactivated by the heater. Corresponding
implementation of a coolant pump must be ensured in the
vehicle by the customer. For information regarding pump selec-
tion and design, see chapter 4.16, "Coolant pump" on page
11. Connection X1 on the control unit, which is provided for
the coolant pump, does not have a function in this variant and
must be closed in this variant with a dummy connector for seal-
F
ing purposes (see Fig. 1, position Q).
WARNING
E
Use of an unsuitable pump or malfunction thereof may
G
result in the heater being damaged. Compared to the
H
basic variant, there is no monitoring of the pump as
well as a control unit via the heater is not possible in
I
heating mode. This must be ensured by the customer as
J
part of the vehicle application.
The additional functions correspond to the standard version of
K
the heater.
Q
3.2.3
Thermo Top Pro 120 Chiller
This variant is based on the previous "CPoff" and has the same
requirements for use of the coolant pump. However, operation
is only permitted in the "Motor on" configuration. As a result,
the permissible coolant temperature is limited to 65 °C. The
heater must be connected according to the chiller-specific wir-
ing diagram (see Fig. 56).
3.2.4
Thermo Top Pro 120 | 150 ADR
In this case it is the standard version of the heater with ADR-
specific provision in the application. Special requirements for in-
stalling and operating the heater in accordance with the spe-
cifications of the European Agreement concerning the Interna-
tional Carriage of Dangerous Goods by Road (ADR), can be
found in the general installation and operating instructions. Re-
garding ADR, see also: https://www.unece.org/trans/danger/
publi/adr/adr_e.html
Information regarding the heater | 3
5 / 49
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