1. Connection to the vehicle fuel system
Thermo Top Z/C; E / Thermo Top S
Connection to the vehicle fuel system
Fuel Supply
Diesel
Gasoline
l + l  7m
l + l 
4,5m 1 2 1 2
l 1,2 m 
l 0,5 m  1 1
l 5,8 m

l m
 2 2
Permissible fuel
with max. perm. overpressure
(bar) in fuel line
feed height H (m)
gasoline
Diesel
0,00
0,15
0,30
1,00
0,07
0,21
perm. fuel
with max. perm. vacuum (bar)
suction height S (m)
in fuel tank
gasoline
Diesel
0,00
– 0,04
– 0,35
0,50
– 0,00
– 0,31
1,00 –
– 0,27
/ tt / WTI / ATT-T

2. Installation example VW Bora TT-E/TT-Z/C
Thermo Top E / Thermo Top Z/C
Installation example VW Bora TT-E/TT-Z/C
1 Heating unit Thermo Top Z/C or E
2 Flat fuse holder and fan relay
1 Seal, Formwasher
2 Stopnut
3 Hose
4 Wireclip
5 Clip
6 Clip
7 Clamptube, black
3 Digital timer
4 Exhaust silencer
5 Combustion air intake line
6 Metering pump
/ tt / WTI / ATT-T

3. Metering pump Thermo Top Z/C; E DP 2 DP 2 R 2 DP 2 DP 30 0-90° 0-90°
0-180°
0-180°
0-180°
0-180°
0-180°
0-180°
horizontal only
/ tt / WTI / ATT-T

4. Thermo Top
Integration into fuel system of injection engines In-series integration into return line
Thermo Top 1 2 3 4
1 Injection system
2 Engine
3 Return line
4 Flow line
/ tt / WTI / ATT-T

5. Thermo Top
Integration into engine-water circuit, integration in secondary circuit (non-return valve)
Thermo Top 1 2 3
1 Engine
2 Non-return valve
3 Vehicle heat exchanger
/ tt / WTI / ATT-T

6. Integration into engine/water circuit In-series integration
Thermo Top
Integration into engine/water circuit In-series integration
Thermo Top 1 2
1 Engine
2 Vehicle heat exchanger
/ tt / WTI / ATT-T

7. Thermo Top
Integration into fuel system of injection engines In-series integration into return line
Thermo Top 1 2 3 4
1 Injection system
2 Engine
3 Return line
4 Flow line
/ tt / WTI / ATT-T

8. Example of fan control, Audi A4 air conditioning system
Thermo Top
Example of fan control, Audi A4 air conditioning system
1 Vehicle fuse holder
2 Fan motor
3 Recirculating air valve
/ tt / WTI / ATT-T

9. Wiring harness, upgrade kit
Thermo Top Z
Wiring harness, upgrade kit
1 Digital timer
2 Connection f. supplementary heating device
3 'Equipment on' indicator
4 Circulating pump
5 Fan connection
6 Negative conductor
7 Relay base
8 Relay base
9 Fan relay
10 Negative conductor
11 Fuse block
12 Negative conductor
13 Mounting plate
14 Fuse cover
15 Voltage supply terminal 30
16 Werle relay
/ tt / WTI / ATT-T

10. Wiring harness, supplementary heating device
Thermo Top Z
Wiring harness, supplementary heating device A
Heater
Metering pump
Diagnostic connector
Thermostat B C D
/ tt / WTI / ATT-T