Sanremo Amalfi DLX SED Instruction Booklet page 20

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.
Fluid-o Tech supplies an optional kit code N. 10051020.
2-Quality of Water.
3-Dry operation
Rotary vane pumps may operate in dry condition only for a very short time- few seconds!
Without a proper water cooling the temperature of the mechanical seal will increase very quickly with resulting breakage. The most likely impact is a
remarkable leak visible from the four drain holes close to the motor clamp . For potential lack of feed from city water line Fluid-o-Tech recommend
the installation of a minimum pressure safety switch upstream from the pump. In case of feed from a tank install on the tank a minimum level switch.
4-Cavitation
more users on the same line.
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
In both cases it is likely to create a damage.
7) Pressure strokes
To avoid pressure strokes opening of solenoid valves installed downstream must happen before the start of the pump. For the same reason closing
of the valve must be delayed after stopping of the pump.
A pressure stroke may break graphite parts and damage mechanical seal causing blockage of the pump and leaks.
8) Handling
very careful when clamping the pump to mount or demount connectors.
9) Scale build up
the pressure relief valve cannot work properly.
In some circuits it is advisable to periodically remove scale with a chemical treatment.
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