Sanremo TORINO SAP Instruction Booklet page 31

ENGLISH
Warning – correct use of rotary pumps
1-Proper Alignment of Pump and Motor
On occasion the noise of a motor-pump assembly is caused by a poor alignment.
2-Quality of Water.
3-Dry operation
Rotary vane pumps may operate in dry condition only for a very short time- few seconds!
the installation of a minimum pressure safety switch upstream from the pump.
4-Cavitation
more users on the same line.
before the pump start up. This will avoid cavitation. For the same reason closing of the safety valve must be delayed after the pump shut down.
The most noticeable effect is an increase of noise. If cavitation continues the impact is the same as of dry operation.
5-Back Feed of Hot Water
If a non return valve between the pump and the hot water vessel is defective the pump may come in contact with hot water(90-100°C). Dimensional
variations of components will cause seizure of the pump.
6) Wrong connections
7) Pressure strokes
8) Handling
very careful when clamping the pump to mount or demount connectors.
9) Scale build up
In some circuits it is advisable to periodically remove scale with a chemical treatment.
31