EN
5
1 Applications
MICRA HS
pumps have been designed to pump clean, non-aggressive, non-explosive, non-dense liquids which do not contain solid
particles, grass, fibres or sand in quantities of more than 30g/m
3
.
Typical applications:
water supplies for:
-
domestic
use,
-
small water supply systems,
-
small
irrigation
systems.
transferring liquids to tanks.
pressure
boosting.
Information valid for all models:
The maximum sand content in the water must not exceed 30 g/m
3
. High sand concentrations will drastically reduce the pump’s lifetime
and increase the risk of seizing and continual tripping of the overload devices, causing the motor to burn out.
2 Technical
characteristics
Power factor:
PF=1.
pH values:
From 6 to 7.
Motor power cable:
1.4 m, 3 x 1 mm
2
, PE.
Liquid temperature:
The temperature of the pumped liquid must not exceed 35°C.
Pump port diameter:
DNM 1”.
Pump diameter:
74 mm.
Well diameter:
Minimum 76 mm.
Installation depth:
Maximum 90 m below the static water level.
Net weight:
Maximum 10 kg.
2.1 Storage
Storage temperature:
from -20°C to +60°C.
2.1.1 Protection against frost
If the pump has to be placed in store after use, keep it in a place where temperatures do not fall below zero. The motor must be filled
with the specific liquid before being placed in store.
3 Preparation
Tesla s.r.l. 3” submersible motors are fitted with water-lubricated bearings. No further lubrication is required.
Submersible motors are filled with a special anti-freeze liquid providing protection down to a temperature of -20°C which will also
prevent the formation of bacteria.
3.1 Positioning
requirements
The pump has been designed for vertical and horizontal installation. However, the pump shaft
must never be
below the horizontal
plane.
If the pump is installed horizontal, in a tank for example, it must be fitted with a cooling jacket.
3.2
Pumped liquid temperature/cooling
To ensure that the motor is kept cool, the maximum temperature of the liquid must be kept at 35°C in all conditions.
Note:
the well diameter must be at least 76 mm (about 3”).
The motor must always be installed above the well filter. If a cooling jacket is used, the pump can be installed in any position in the well.
