Potentially Explosive Environments; Installation - Grundfos SL1 Instrucciones De Instalación Y Funcionamiento

6.1 Potentially explosive environments

Use explosion-proof pumps for applications in potentially
explosive environments. See section 5.2.
Warning
FM
SL1 and SLV pumps must under no
circumstances pump combustible liquids.
Warning
FM
The classification of the installation site must be
approved by the local fire-fighting authorities in
each individual case.
Special conditions for safe use of SL1 and SLV
explosion-proof pumps:
FM
1. Make sure the moisture switches and thermal
switches are connected in the same circuit but
have separate alarm outputs (motor stop) in case
of high humidity or high temperature in the motor.
2. Bolts used for replacement must be class A2-70
or better according to EN/ISO 3506-1.
3. Contact the manufacturer for information on the
dimensions of the flameproof joints.
4. 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.
6. The sewage pumps have an ambient temperature
range of -4 °F to +104 °F (-20 °C to +40 °C) and a
maximum process temperature of +104 °F
(+40 °C). The mininmum ambient temperature for
a pump with a water-in-oil sensor is 32 °F (0 °C).
7. The thermal protection in the stator windings has
a nominal switch temperature of 302 °F (150 °C)
and must guarantee the disconnection of the
power supply; the power supply must be reset
manually.
8. The control unit must protect the WIO sensor
against short circuit current of the supply to which
it is connected. The maximum current from the
control unit must be limited to 350 mA.

7. Installation

Warning
During installation, always support the pump by
means of lifting chains or place it in horizontal
position to secure stability.
Prior to installation, make sure the tank bottom is
Caution
even.
Warning
Before beginning the installation, switch off the
power supply and lock the mains switch in
position 0.
Any external voltage connected to the pump must
be switched off before working on the pump.
Before beginning installation procedures, carry out these checks:
• Does the pump correspond to order?
• Is the pump suitable for the supply voltage and frequency
available at the installation site?
• Are accessories and other equipment undamaged?
Further details concerning accessories can be
found in the product guide SL1, SLV pumps on
Note
www.grundfos.com.
Fix the extra nameplate supplied with the pump to the cable end
in the control box.
All safety regulations must be observed at the installation site,
e.g. the use of blowers for fresh-air supply to the tank.
Prior to installation, check the oil level in the oil chamber.
See section 10. Maintenance and service.
Warning
Do not put your hands or any tool into the pump
suction or discharge port after the pump has
been connected to the power supply, unless the
pump has been switched off by removing the
fuses or switching off the mains switch. It must
be ensured that the power supply cannot be
accidentally switched on.
We recommend to always use Grundfos
accessories to avoid malfunctions due to
Caution
incorrect installation.
Warning
Only use the lifting bracket for lifting the pump.
Do not use it to hold the pump when in operation.
Installation types
The SL1 and SLV pumps are designed for two installation types:
• submerged installation on auto-coupling
• free-standing submerged installation on ring stand.
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