Coolant; Fuel Filter - Webasto Thermo Top Pro 120 Workshop Manual

4 | Description of the components
l Overvoltage protection
In the event of overvoltage, the coolant pump automatic-
ally shuts down at a voltage supply above 36 V (24 V) and
16 V (12 V). If the voltage drops to 35 V or 15 V, the pump
automatically switches itself on again.
If overvoltage is diagnosed, the coolant pump sends a cor-
responding diagnostic signal to the heater control unit.
l Undervoltage protection
BIn the event of undervoltage, the coolant pump automat-
ically shuts down at below 13.5 V (24 V) and 8 V (12 V)
power supply. If the voltage rises to 14.5 V or 9 V, the
pump automatically switches itself on again.
If undervoltage is diagnosed, the coolant pump sends a
corresponding diagnostic signal to the heater control unit.
l Reverse-polarity protection
NOTE
The coolant pump motor is not equipped with internal
reverse-polarity protection.
l Electrical protection
NOTE
The fuse for the coolant pump must never be pulled out
during operation
The fuse for the coolant pump must never be replaced
when switched on.
l Transport and storage
The pumps should only be transported and stored in the
appropriate transport packaging. Unsorted transport (e.g.
bulk product) is not permitted.
NOTE
The coolant pump shuts off for:
- Overvoltage
- Undervoltage
- An internal fault
- Dropping below the minimum speed
- Permissible operating temperature exceeded
Use of an external coolant pump
The externally controlled coolant pump in the CPoff variant
must ensure that the coolant is delivered in the coolant circuit
of the heater or vehicle. It must satisfy the following technical
features:
Nominal volume flow [l/h]
(against 0.56 bar)
Minimal volume flow [l\h]
(if lower than this then there
is a risk of overheating.
Heater may be damaged)
After-running period
Connection piece diameter /
Reduction of cross-section
The coolant pump must be in operation during the entire heat-
ing mode and during the after-running period.
4.17

Coolant

Follow the instructions of the vehicle manufacturer when check-
ing the coolant level.
12 / 49
Thermo Top Thermo Top
Pro 120 Pro 150
1500
1100 1400
Min. 60 s
System diameter TTP120|150
= 20 mm.
Reduction of cross-sections
should be avoided.
NOTE
You will find further information in the installation in-
structions and at the vehicle manufacturer.
Coolant Mix ratio e.g. Glysantin®/water.
Permissible water/glycol (monoethylene glycol) mixes:
Glycol [%]
Minimum 33
Maximum 60
4.18

Fuel filter

A
Fig. 17 Fuel filter
A Fuel filter without heating
B Fuel filter with heating
The externally located fuel filter is used for separating sediment
from the fuel and therefore prevents blocking of the fuel nozzle.
Filter heating is available as an option. It is recommended or ne-
cessary to install filter heating under certain use and operating
conditions. See installation instructions.
The filter heating cut-in point is approx. -5 °C and the cut-out
point is approx. +5 °C.
9039412C Workshop manual TTP 120 _ 150
Water [%]
40
67
D
B C
C Electrical connection
Bleed screw
D