Portable Wet Installation; Dry-Run Protection - Wilo Rexa FIT Serie Manual Del Usuario

4 Secure the product to the load-carrying equipment, lift
and lower slowly on to the guide pipes in the operating
area. Hold the electric power cables slightly taut when
lowering. When the product is connected to the sus-
pension unit, make sure that the electric power cables
are secured adequately against falling off and damage.
5 The correct operating position is reached automatically
and the discharge port is sealed by its own weight.
6 For new installation: Flood the operating area and bleed
the discharge pipe.
7 Start the product in accordance with the chapter enti-
tled "Start-up".

5.4.2 Portable wet installation

Fig. 3: Portable installation
Load-carrying equip-
1
ment
2 Pump pedestal
Pipe bend for hose con-
3 nection or Storz fixed
coupling
4 Storz fixed coupling
With this installation type, the product must be
equipped with a pedestal (available as an optional
extra). It is fitted to the intake port and ensures the
minimum floor clearance and a secure position on a
firm foundation. This installation type makes optional
positioning in the operating area possible. For use on a
soft foundation, a hard base must be used to prevent
the machine from subsiding. A discharge hose is con-
nected on the discharge side.
The unit must be anchored to the floor for longer oper-
ating times with this type of installation. This prevents
vibrations as well as guaranteeing quiet and low-wear-
ing running.
1 Mount the pedestal at the intake port.
2 Attach the pipe bend to the discharge port.
3 Fix the discharge hose to the pipe bend with the hose
clamp.
Alternatively, a Storz fixed coupling can be fitted to the
pipe bend and a Storz hose coupling to the discharge
hose.
4 Lay the power supply cable so that it cannot be dam-
aged.
5 Position the product in the operating area. If necessary,
secure the load-carrying equipment to the carrying
handle, lift the product and set it down at the intended
operating position (pit, shaft).
6 Check that the product is upright and standing on a
firm base. Do not let it subside.
7 Have an electrician connect the product to the power
supply and check the direction of rotation in accor-
dance with the chapter entitled "Start-up".
8 Lay the discharge hose so that it cannot be damaged.
Secure at a suitable place as necessary (e.g. drain).
Danger due to discharge hose being pulled off.
Injuries may result from the discharge hose being
pulled or knocked off uncontrollably. The dis-
charge hose must be secured appropriately.
Avoid kinks in the discharge hose.
Installation and operating instructions Wilo-Rexa FIT...
5 Storz hose coupling
6 Discharge hose
Minimum water level for
7a
S1 operation
Minimum water level for
7b
S2 and S3 operation
Beware of burns
The housing parts can heat up to well above
104 °F (40 °C). There is a danger of burns. After
switching off, let the product cool down to ambi-
ent temperature.
5.4.3 Level control
Fill levels can be determined using the level control sys-
tem, meaning the unit is switched on and off automati-
cally. The fill level can be recorded using float switches,
pressure and ultrasound measurements or electrodes.
Note the following information:
• When using float switches, ensure that they can move
freely in the operating area!
• The water level must not fall below the minimum!
• The maximum starts per hour may not be exceeded!
• If the fill levels fluctuate strongly, then a level control
should be made on two test points as standard. This
means larger differential gaps are reached.
Installation
The "A" version in the FIT series is fitted with a float
switch for recording the level. A contact is opened or
closed here, depending on the angle of inclination on
the float switch.
The switching level is defined by the cable length on
the float switch.
Observe the information on the maximum starts
per hour and the minimum water level!

5.5 Dry-run protection

Make sure that no air enters the hydraulic housing. The
product must therefore always be submerged in the
pumped liquid up to the top edge of the pump hous-
ing. For optimum reliability, we recommend installing a
dry-run protection system.
Correct running is ensured by float switches or elec-
trodes. The float switch or electrode is fixed in the
shaft and switches off the machine when the water
level falls below the minimum coverage level. If dry-run
protection is only put into effect with one float or elec-
trode, the unit may turn on and off constantly if filling
levels fluctuate strongly! This can result in the maxi-
mum number of motor start-ups (switching cycles)
being exceeded.
5.5.1 Corrective measures for avoiding excessive switching
cycles
Manual reset - The motor is switched off when the
water level falls below the minimum coverage level and
switched back on when a sufficient water level is
reached.
Separate reactivation point - A second switching point
(additional float or electrode) is used to obtain a suffi-
cient difference between the activation and deactiva-
tion points. This prevents constant switching. This
function can be put into effect with a level control
relay.
English
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