Wilo Rexa UNI Series, Installation And Operating Instructions Manual

Page: 52 / 776

en Maintenance and repair
52 WILO SE 2019-02
9.3 Operating fluid
9.3.1 Oil types
Medicinal white oil is filled into the sealing chamber ex-
factory. The following oil types are recommended when
changing the oil:
▪ Aral Autin PL*
▪ Shell ONDINA 919
▪ Esso MARCOL 52* or 82*
▪ BP WHITEMORE WOM 14*
▪ Texaco Pharmaceutical 30* or 40*
All oil types marked with “*” are approved for use with
foods in accordance with “USDA-H1”.
9.3.2 Filling quantities
The filling quantities depend on the pump type:
▪ Rexa UNI V05...: 600 ml (20 US.fl.oz.)
▪ Rexa UNI V06...: 1000 ml (34 US.fl.oz.)
9.4 Maintenance intervals
To ensure reliable operation, maintenance tasks must be
carried out regularly. Depending on the real ambient
temperatures, maintenance intervals different from
those mentioned in the contract can be defined! If
strong vibrations occur during operation, the pump and
the installation must be checked regardless of the
defined maintenance intervals.
9.4.1 Maintenance intervals for normal conditions
5 years or 1500 operating hours
▪ Visual inspection of the power supply cable
▪ Visual inspection of accessories
▪ Visual inspection of the housing for wear
▪ Function test of monitoring devices
▪ Oil change
10 years or 5000 operating hours
▪ General overhaul
9.4.2 Maintenance intervals for use in sewage lifting units
When the pump is used in sewage lifting units inside
buildings or on plots of land, carry out maintenance in-
tervals and measures in accordance with
DIN EN 12056‑4 !
9.4.3 Maintenance intervals for harsh conditions
Under harsh operating conditions, specified maintenance
intervals must be shortened if required. Harsh operating
conditions include:
▪ Fluids with long-fibre components
▪ Turbulent inlet (e.g. due to air intake, cavitation)
▪ Strongly corroding or abrasive fluids
▪ Heavily gas generating fluids
▪ Operation at an unfavourable duty point
▪ Pressure surges
When using pumps under hard conditions, it is recom-
mended to sign a maintenance contract. Contact cus-
tomer service.
9.5 Maintenance measures
WARNING
Sharp edges on the impeller and suction port!
Sharp edges can form on the impeller and suction
port. There is danger of limbs being severed! Protect-
ive gloves must be worn to protect from cuts.
WARNING
Hand, foot or eye injuries due to the absence
of protective equipment!
Danger of (serious) injuries during work. Wear the fol-
lowing protective equipment:
• Safety gloves for protection against cuts
• Safety shoes
• Closed safety goggles
The following pre-requisites must be fulfilled prior to
starting maintenance measures:
▪ Pump cooled down to the ambient temperature.
▪ Pump cleaned thoroughly and disinfected (if required).
9.5.1 Recommended maintenance measures
Regular inspection of power consumption and the oper-
ating voltage in all three phases is recommended for
smooth operation. In normal operation, these values re-
main constant. Slight fluctuations depend on the charac-
teristics of the fluid. Power consumption can provide an
early indication of damage or malfunctions in the im-
peller, bearings or motor, which can be rectified. Larger
voltage fluctuations strain the motor winding and can
cause the pump to break down. Regular inspections can
therefore largely prevent major secondary damage and
reduce the risk of total breakdown. In this regard, it is re-
commended to use remote monitoring for regular in-
spections.
9.5.2 Visual inspection of the connection cable
Check connection cable for:
▪ Bubbles
▪ Cracks
▪ Scratches
▪ Abrasion
▪ Pinch points