Motor Protection T1-T2; Connection With The Thermal Probes; Rotation Direction (Only For Three-Phase Pumps); Instructions And Further Warnings - dreno Compatta PRO Serie Manual De Uso Y Mantenimiento

8 .2 Motor protection T1-T2

Alll the models are fitted with thermal probes T1-T2 in winding (connected to a control board built with ad-
equate safety devices), which promptly warn and switch off the pump in case of motor over temperature. This
safety device is inserted normally closed and will open at 130°C disconnecting the power supply, only closing
again when the temperature drops to 75°C (see paragraph 8.1).

8 .3 Connection with the thermal probes

Submersible electric pumps should be protected by a cut-out device being able to disconnect the electric
supply in case of over temperature of the windings with the intervention of a thermal protection device and in
the case when the suction inlet is not below the liquid head; these devices should not be self-resetting, use
devices that require manual resetting after checking the float functions correctly.
WARNING: electric pumps should be protected by a cut-out device to disconnect the
electric supply in case of over temperature.

8 .4 Rotation direction (only for three-phase pumps)

After each new connection, phase or voltage failure, it is possible that the phases are inverted, therefore
check the rotation direction. Incorrect rotation direction causes the motor to overheat involving strong vibra-
tions and considerably reduces the performance of the pump.
To check the exact rotation direction of the impeller, slant the pump slightly and run loadless for few
seconds.
WARNING: keep away from the impeller when starting up the pump.
Danger! Pay attention to kick back at the start-up.
If, at start-up, the pump kicks back in an anticlockwise direction (view from above), check the connection is
correct, failing which disconnect the electric supply and invert the two phases.
In the view from below (suction inlet) the exact rotation of the impeller is anticlockwise.

9 . Instructions and further warnings

9 .1 Transport

WARNING: Never lift the pump using the electric cable; always use the special supplied
handle.
If it is necessary to move the pump from one place to another, for safety reasons, it is
compulsory to disconnect the power supply.

9 .2 Use

WARNING: Do not use the pump dry/loadless since in this case there is the danger of ex-
plosion; do not use the pump with flammable liquids such as petrol, etc.
At subzero room temperatures, the pump will not freeze since the liquid in which it is immer-
sed has a temperature between: 0 ÷ 40°C. If the electric pump is removed from the water
and therefore exposed to subzero temperatures, there is a danger the impeller will freeze.
Should the impeller freeze, submerge the pump in water until it defrosts.
It is forbidden to use quicker methods (for ex. heat it), so as not to cause damage to the
machine.
Do not use the pump to pump aggressive liquids not within acceptable pH limits.
Do not use the pump to pump liquids containing solid parts with dimensions larger than
that those stated in the table in paragraph 5 Technical data.
- 31