Commissioning
en
Installation and operating instructions Wilo-EMU FA + FK 17.1, FK 202, FK 34, FK 42
27
Direction of rotation check
A qualified electrician checks the rotating field at the mains connection with a rotating
field-test device. For the correct direction of rotation, a clockwise rotating field must
be available at the mains connection. The pump is
not
approved for operation with a
counter-clockwise rotating field!
CAUTION! If the direction of rotation is checked
with a test run, comply with the ambient and operating conditions!
Incorrect direction of rotation
If the direction of rotation is incorrect, change the connection as follows:
▪ Swap two phases for motors with direct starting.
▪ Swap the connections of two windings (e.g. U1/V1 and U2/V2) for star-delta activation
motors.
7.4
Operation in an explosive atmo-
sphere
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.
FK 17.1
FK 202
FK 34
FK 42
ATEX approval
o
-
-
-
FM approval
o
-
-
-
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 areas, which require
devices belonging to group II, category 2. The pumps can be used in both 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 areas, which require
devices belonging to the protection class “Explosion proof, Class 1, Division 1”. There-
fore, operation in areas with the required protection class “Explosion proof, Class 1, Di-
vision 2” is also possible.
7.5
Before switching on
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?
