General Overhaul; Troubleshooting And Possible Solutions - Wilo Rexa FIT Serie Manual Del Usuario

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connected. The monitoring device is then tested with
an ohmmeter.
The following values should be measured:
• Bi-metal sensor: Value = "0" - throughput
• PTC sensor: A PTC sensor has a cold resistance of
between 20 and 100 ohms.
• For 3 sensors in series, this would result in a value of
between 60 and 300 ohms.
• For 4 sensors in series, this would result in a value of
between 80 and 400 ohms.
• Moisture sensor: This value must go towards infinity. If
there is a low value, there is water in the oil. Also
observe the instructions of the optionally available
evaluation relay.
In the case of larger deviations, please consult
the manufacturer.
8.3.6 Visual inspection of the power supply cable
The power supply line must be examined for bubbles,
cracks, scratches, chafed areas and/or crushed sec-
tions. If damage is found, the power cable must be
exchanged immediately.
The cables may only be changed by Wilo cus-
tomer service or an authorized/certified service
workshop. The product may not be used again
until the damage has been rectified correctly!
8.3.7 Turning the impeller
1 Lay the unit horizontally on a firm surface.
Make sure that the unit cannot fall over and/or
slip away.
2 Reach into the hydraulic housing below and turn the
impeller.
Beware of sharp edges!
Sharp edges can form on the impellers and
hydraulic opening. There is a risk of injuries! Wear
protective gloves.
8.3.8 Checking the oil level in the oil separation chamber
Fig. 6: Plugs
1 Plug
1 Lay the unit horizontally on a firm surface with the plug
facing upwards.
Make sure that the unit cannot fall over and/or
slip away.
2 Slowly and carefully remove the plug.
Caution: The lubricant may be pressurized.
3 The lubricant must reach to about 1 cm (0.4 in) below
the plug opening.
4 If there is not enough oil in the oil separation chamber,
top it up. When doing so, follow the instructions under
"Changing the oil".
5 Clean the plug, fit with a new sealing ring if necessary
and screw it in again.
42
8.3.9 Changing the oil in the oil separation chamber
Fig. 7: Plugs
1 Plug
1 Lay the unit horizontally on a firm surface with the plug
facing upwards.
Make sure that the unit cannot fall over and/or
slip away.
2 Slowly and carefully remove the plug.
Caution: The lubricant may be pressurized.
3 Drain off lubricant by turning the unit until the opening
faces downwards. Collect the lubricant in a suitable
container and dispose of according to the require-
ments in the "Disposal" chapter.
4 Turn the unit back until the opening is facing upwards
again.
5 Fill the new lubricant by means of the opening in the
plug. The oil must reach to about 1 cm (0.4 in) below
the opening. Comply with the specified lubricants and
filling quantities!
6 Clean the plug, fit with a new sealing ring and screw it
in again.

8.3.10 General overhaul

During a general overhaul, the bearings, shaft seals,
O rings and power supply cables are inspected and
replaced as required in addition to normal maintenance
work. This work may only be conducted by the manu-
facturer or an authorized service workshop.

9 Troubleshooting and possible solutions

In order to prevent damage or injury while rectifying
product faults, the following points must be observed
in all cases:
• Only attempt to rectify a fault if you have qualified
staff. This means that each job must be carried out by
trained specialist staff. For example, electrical work
must be performed by a trained electrician.
• Always secure the product against an accidental restart
by disconnecting it from the mains. Take appropriate
safety precautions.
• Always have a second person on hand to ensure that
the product has been switched off for safety.
• Secure moving parts to prevent injury.
• Unsanctioned changes to the product are made at the
operator's own risk and release the manufacturer from
any warranty obligations.
9.0.1 Fault: The unit will not start
1 Electricity supply interrupted, short circuit or earth
fault in the cable or motor windings
• Have the motor and wires checked by a specialist
and replaced if necessary.
2 Fuses, the motor protection switch and/or monitoring
devices are triggered
• Have a specialist inspect the connections and cor-
rect them as necessary.
WILO SE 10/2011 V4.1WE