ORELL PWO Notice D'installation page 6

Please read this information prior to installing ORELL Tec PWO water oil cooler.
Connection of oil/water inlets and
outlets
Standard PWO water oil cooler:
Oil connection diameters should always be larger
than water connection diameters.
Connect inlet oil to lower left connection (F3).
Connect oil outlet to upper left connection. (F1)
Connect water inlet to upper right connection. (F2)
Connect water outlet to lower right connection (F4).
Please note that on PWO B56 the oil/water inlets
and outlets are different to above!
Use filter to prevent clogging due to contamination.
However, deposits less than 1 mm will not cause any
problem.
Positioning
The cooler can be installed in any position, bearing
in mind the need for draining. To minimise clogging
on the water side, we recommend a vertical installa-
tion as shown in figure above.
How to avoid material stress
All units – without support – should be fitted with a
clamp around the cooler. Some larger units are
should be fitted with additional fixing screws on the
connection side. However, never mount the cooler
using only these screws!
Never install the cooler in a rigid frame. Use hydrau-
lic hoses for soft and flexible installation. All tubing
should be made to minimise stress and vibration. In
a hydraulic system, where the cooler is connected
on the return line, use flexible hoses to minimize
pulsations and if necessary fit a by-pass valve on the
oil inlet to avoid overpressure from static loads.
Signs of clogging
To establish clogging, check water inlet and outlet
temperatures. Clogging will reduce heat transfer
capacity, causing increased water consumption,
reduced difference in water inlet and outlet
temperature and a rise in oil temperature.
Another method is to check pressure drop across
the cooler. Clogged and narrow passages will cause
acceleration in flow rate and increased pressure
drop. Always observe that water flow is as advised.
Any deviation from stated flow will, of course, affect
temperature and pressure drop.
Cleaning
In general, all minor deposits can be removed by
back flushing the cooler with water. Fouling can be
dealt with using light acid. Use 5% phosphoric acid
or, when cleaned frequently, 5% oxalic acid or sim-
ilar light organic acid. Rinse the cooler with a large
quantity of water. Remove all acids before restarting
the system. Always clean the cooler before it
becomes completely clogged.
Material AISI 316. Max. working pressure 31 bar.
Max. working temperature 185
coolers are pressure tested for leakage at 47 bar
prior to delivery.
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C. All PWO water oil