Connection To The Vehicle's Cooling System - Valeo Thermo AC Einbau- Und Betriebsanweisung

Installation of the heater - fitting of important assemblies

11.2. Connection to the vehicle's cooling system

The heating appliance is connected to the vehicle's cooling system
according to figure 11. The volume of coolant fluid present in the circuit
must be at least 25 litres. The water in the heating circuit of the heating
appliance must contain at least 30 to 60% of a branded antifreeze agent.
An up-to-date list of Valeo recommended anti-freeze agents can be
found on the Valeo website.
The water hoses approved for use with the appliance by Valeo must
always be used. If this is not the case then the hoses must at least
comply with DIN 73411. The hoses are to be laid without kinks and also
rising where possible for the proper bleeding of the heating appliance.
The heater must be mounted below the minimum water level of the
cooling circuit. Hose connections are to be secured with hose clips
against falling off.
When installing the electric heater the direction of the flow of the cooling
water in the circuit is to be considered (see figure 11).
ATTENTION:
The specified tightening torques of the hose clamps used must be
adhered.
In the vehicle cooling system, or in the case of a separate heating circuit,
only overpressure valves with an opening pressure of maximum 2 bar
should be used.
Attention should be paid to the careful bleeding of the cooling system
without usage of the circulating pump, before the first commissioning of
the heating appliance, or after the coolant fluid has been replaced.
For that the additional venting option via the vent screw item 4, figure 11
is to be used after the system has been filled and the pump has been
switched on.
The heat exchanger and the water hoses of the Thermo AC 200 should
be pre-filled completely. Loosen the vent screw slightly until no air
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Thermo AC 2nd generation
further emerges, but only water. Then retighten the screw (tightening
torque - see figure 13).
ATTENTION:
If air bubbles are present, they could cause destruction of the car-
tridge heaters!
The heating appliance and pipes must be installed in such a way that
they ensure a static bleeding of the system.
The correct degree of bleeding results in an almost silently operating
circulation pump. An inadequate bleeding can lead during heating
operation to the switching-off of the heating appliance due to overhea-
ting.
Where the U 4855 / Aquavent 6000C circulation pump is used, the circu-
lation pump is automatically switched off ca. 10 seconds after switching
on, if the cooling agent is not present or there is blockage of the pump
impeller, and it can be started up again after ca. 2 minutes.
Where the U 4856 / Aquavent 6000SC circulation pump is used, the
circulation pump is automatically switched off ca. 45 seconds after swit-
ching on, if the cooling agent is not present or there is blockage of the
pump impeller, and it can be started up again after ca. 2 minutes.
ATTENTION:
Before commissioning the heating system, the water hoses, the
circulation pump and the heating appliance must be filled comple-
tely.
Only by Valeo recommended anti-freeze agents may be used.