ENGLISH
18
4.
THE PUMP MUST ALWAYS BE SUBMERGED WHEN WORKING. The level of pumped liquid must be controlled by two
level switches connected to the motor control circuit. The minimum level depends on the installation type and is specified
in these installation and operating instructions.
5.
Make sure the permanently attached cable is suitably mechanically protected and terminated in a suitable terminal board
placed outside the potentially explosive area. The pump is supplied with an appropriate
power supply cable.
6.
The sewage pumps have an ambient temperature range of -20 °C to +40 °C and a maximum process temperature of
+40 °C. The minimum ambient temperature for a pump with a water-in-oil sensor is 0 °C.
7.
The thermal protection in the stator windings has a nominal switch temperature of 130°C and must guarantee the
disconnection of the power supply; the power supply must be reset manually.
2. GENERAL DESCRIPTION
This manual contains the instructions for the installation, operation and maintenance of submersible pumps of the FK series. The pumps
are equipped with electric motors with power between 1.1 and 11 kW.
The pumps in the FK series are designed and suitable for pumping domestic and industrial sewage and waste waters compatible with
the materials of which the pumps are made.
The pumps can be installed on an auto-coupling system or stand freely on the bottom of a tank.
The booklet also includes specific instructions for the explosionproof pumps.
TECHNICAL CHARACTERISTICS
Consult the Instructions Booklet and the data plate to check the following technical data:
Electric Power Supply | Construction Characteristics | Hydraulic Performance | Working Conditions | Pumped liquids.
2.1 Product drawing
Fig. 1
FK pump
Pos. Description
Material
1
Lifting bracket
Steel AISI 304
2
Nameplate
Steel AISI 304
3
Oil screws
Steel AISI 304
4
Discharge flange
GJL200
5
Cable plug
H07RN8-F
6
Pump housing
GJL200
2.2 Operating conditions
The FKV and FKC pumps are suitable for the following operating situations:
•
S1 operation
(continuous operation), the pump must always be
covered by the pumped liquid to the top of the motor. See fig. 2.
•
S3 operation
(intermittent duty), the pump must always be covered
by the pumped liquid up to the top of the pump body. See fig. 2 (only
for non explosion-proof versions).
Fig. 2
Stop levels
PH value
FKV and FKC pumps in a fixed installation can be used for pumping liquids with pH values from 6.5 to 12.
Temperature of the operating liquid
0 °C to +40 °C.
For short periods a temperature of up to +60 °C is permissible (non-Ex versions only).
Explosion-proof pumps must never pump liquids of a temperature higher than +40 °C.
Ambient temperature
S1 operation
S3 operation
