Installation Instructions
Seite/Page 78 Kapitel/Chapter 6: Installation Instructions 30.10.12
6.8.12 ATTENTION! Temperature restriction!
This pump may only be used if it is ensured that the temperature of the coolant entering the pump does not exceed
70°C during continual duty. 75°C is permissible for short periods. These may, however, in no case be for longer peri-
ods. If the coolant temperature exceeds the permissible rate, this can lead to the impeller blades being torn off.The
advantage of this impeller pump is that this pump, as a "positive displacement pump", is self-suctioning and is there-
fore very sensitive to air bubbles etc.
Ventilating the cooling system with the aid of a self suction impeller pump is very simple. In some cases the pump is
additionally installed for this reason alone. Unfortunately the operating noise of these pumps is very loud.
In spite of this attention must be paid that a zone is available at a high point, where the air bubbles in the coolant are
able to escape to. As a rule, this is the expansion tank, as long as this is connected direct to the tank. If the coolant
expansion tank is, however, so integrated in the system that it cannot be reached by circulating water, then an air
release valve must be fitted in the circulation pipe at a place of your own choice, which can then also be connected
to the expansion tank (see next page).
In case of doubt, you should send a diagram of the required coolant system to Fischer Panda and let this be chek-
ked there.
6.8.13 Installation with special air separator
An "air separator" must be fitted at all critical places in the circulation system, in case a perfect automatic ventilation
on account of obstacles in the pipe passage cannot be achieved. A self-actuating ventilation valve must be fitted to
each air separator.
6.8.14 Monitoring the Temperature
You are expressively advised to measure the temperature of the circulating coolant after installation. Two remote
thermometers must be used for this. A connection must be fitted to the motor coolant inlet; the second on the coolant
outlet. After a short warming-up period, the generator must have a load of at least 75% of the nominal capacity
placed on it. The coolant circulating is to be checked. The values must lie within the following limits:
1. Coolant inlet, max 70°C during constant duty at maximum
load
2. Coolant outlet, max 85°C during constant duty
3. Difference of both values: This point is especially impor-
tant and gives an indication of the coolant circulating. The
difference should amount to a maximum of 17°C for a
water-cooled system with an integrated water-cooled pre-
silencer, as a rule it should, however, lie between 10 -
12°C.
The circulating coolant is not sufficient, if the difference amounts to more than 15°C, and the amount of water circu-
lating must be increased. This can be solved, for example, if the pipe passage is improved or the pulley diameter is
reduced. It is absolutely essential to measure the performance of the cooling system after installation of the genera-
tor. The above named values should be considered as the maximum permissible values. They are also valid for
operation at high temperatures. During constant duty at normal temperatures (20°C), the values should be well
below the above named data.
6.8.15 Installing a Coolant Temperature Display
A remote display unit for coolant temperatures should be installed, when fitting sensitive systems (i.e. Television
broadcasting vehicles, ambulances or other vehicles) with sensitive measuring instruments. In this case a standard
coolant display device with remote thermometer can be used. It is absolutely essential that two display instruments
are installed:
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