8 Servicing work Thermo Top Evo
802
NOTE
Ensure the correct direction of flow of the circulating pump
to the vehicle coolant circuit. The installation position of the
circulation pump must be chosen so that the circulation
pump is self-bleeding. It must be possible for the air volume
trapped in the circulating pump to escape upward by itself
via at least one connection piece.
Electrical checking of circulating pump
Internal resistance of the circulating pump: 10 ± 1 kohms
8.4 DP42 metering pump
Check the installation positions and installation conditions
of the metering pump in accordance with the general instal-
lation instructions for the Thermo Top Evo. The Thermo Top
Evo heater may only be operated with the DP42 metering
pump.
Electrical checking of metering pump
Coil resistance of the DP42 metering pump:
5.20 ohms ± 0.5 % at 20 ± 2 °C
Carry out the function component test of metering
pump with Webasto Thermo Test PC-Diagnose.
Fig. 804 Installation position of DP42 metering pump
8.5 Checking work
The following servicing work is to be carried out every two
years at the latest to maintain the functional reliability of the
heater:
• Read out fault memory.
• Inspect electrical connections for contact corrosion and
firm seating.
• Inspect exhaust and combustion air lines for damage
and to ensure that they are clear.
• Check fuel line for leaks.
• Check hoses for cracks.
• Conduct operating test of heater as described in section
6.2.
8.6 Heater, removal and installation
8.6.1 Removal
1 Interrupt power supply of heater by removing 20 A
blade fuse (yellow) from Webasto fuse holder.
2 Disconnect electrical connectors from heater.
3 De-pressurise coolant system.
NOTE
All open plugs and connectors must be protected against
moisture and soiling.
4 Loosen hose clamps and pull coolant hoses off water
connection pieces of heater. The coolant hoses must be
secured against draining.
5 Loose combustion air pipe and exhaust pipe on heater
and pull off.
6 Loosen hose clamps and pull off fuel line. Seal off fuel
connection piece on heater and fuel line with suitable
sealing plugs etc.
7 Detach heater from bracket; remove bracket from body
if necessary.
Setting 7 Hz / 60 sec 7 Hz / 180 sec
Diesel 12.0 to 14.6 ml 36.2 to 44.3 ml
Petrol 11.6 to 14.3 ml 34,9 to 42.8 ml
Fig. 803 Pumping quantity of DP42 metering pump
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