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Verfügbare Sprachen
Verfügbare Sprachen
7.4
Operation in an explosive atmo-
sphere
7.5
Before switching on
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID
Commissioning
DANGER
Risk of explosion due to flying sparks in the hydraulics!
During operation the hydraulics must be flooded (completely filled with the fluid). If
the volume flow is interrupted or the hydraulics emerges, air cushions can form in
the hydraulics. If this happens, there is a risk of explosion, e.g. flying sparks due to
static charge! Dry-running protection must ensure that the pump is deactivated at
the appropriate level.
ATEX approval
FM approval
CSA-Ex approval
Key: − = not available/possible, o = optional, • = as standard
For use in explosive atmospheres, the pump must be marked as follows on the rating
plate:
▪ "Ex" symbol of the corresponding approval
▪ Ex classification
For the relevant requirements, refer to the explosion protection chapter in the ap-
pendix of these installation and operating instructions!
ATEX approval
The pumps are suitable for operation in potentially explosive atmospheres:
▪ Device group: II
▪ Category: 2, zone 1 and zone 2
These pumps must not be used in zone 0!
FM approval
The pumps are suitable for operation in potentially explosive atmospheres:
▪ Protection class: Explosionproof
▪ Category: Class I, Division 1
Notice: If the cabling is carried out according to Division 1, installation in Class I, Divi-
sion 2 is also permitted.
Check the following prior to activation:
▪ Check whether the device has been installed properly and in accordance with the locally
applicable regulations:
– Has the pump been earthed?
– Layout of power supply cable tested?
– Electrical connection made properly?
– Mechanical components attached correctly?
▪ Check level control:
– Float switches can move freely?
– Switching level tested (pump on, pump off, minimum water level)?
– Additional dry-running protection installed?
▪ Test operating conditions:
– Min./max. temperature of the fluid tested?
– Max. immersion depth tested?
– Operating mode defined depending on the minimum water level?
– Maximum switching frequency adhered to?
▪ Check installation location/operating space:
– Pipe system on the pressure side free of deposits?
– Inlet or pump sump cleaned or free of deposits?
– All gate valves open?
– Minimum water level defined and monitored?
The hydraulics housing must be filled completely with the fluid and there must be no
air cushions in the hydraulics. NOTICE! Provide suitable venting devices if there is a
risk of air cushions being formed in the system!
HC 20.1
o
o
−
en
HC 20.1 ...-E3
o
−
−
175
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