B753-03-880 Issue F
Page 22 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
3.7.2 Forced-air cooling
An air-cooler accessory is available for the EXT pumps (refer to Section 7). Fit the air-cooler as described in the
instruction manual supplied with it. If you wish to use an alternative fan for air-cooling, ensure that the flow rate is
above 70 m
3
h
-1
(40 cfm)
3.7.3 Water-cooling
A water-cooler accessory is available for the EXT pumps (refer to Section 7.3.4). Fit the water-cooler as described in
the instruction manual supplied with it.
The cooling-water supply must comply with the specification given in Section 2.5. Pipes in the water-cooling circuit
may become blocked if the cooling-water contains too much calcium carbonate or if it contains particulates which
are too large. Corrosion of the water-cooling circuit may occur if there is too little calcium carbonate and oxygen in
the water. Good quality drinking water is usually suitable for water-cooling. If in doubt, you must check the quality
of your cooling-water supply and, if necessary, provide treatment and filtration.
Connect the cooling-water supply to the water-cooler on the pump as described below. Either of the two riffled
connectors on the water-cooler can be used for the water supply or return connections.
1. Push reinforced hose (approximately 6 mm internal diameter) over the ends of the riffled hose connectors on
the water-cooler on the pump.
2. Attach the hose with strong hose clips and make sure that they are tightened securely.
Alternatively, unscrew the riffled hose connectors and remove them from the water-cooler and make direct
connections to the 1/8 BSP female threaded fittings on the water-cooler.
You must turn off the cooling-water supply when you switch off the pump to prevent condensation of vapours inside
the pump. The EXC Controller (EXC120 and EXC300) can operate a solenoid-valve for this purpose.
If you want to remove the pump for maintenance, and you do not want to break the cooling-water circuit, unscrew
the two M4 cap-head fixing-screws and remove the water-cooler from the pump. Make sure that there is a layer of
thermal contact grease on the water-cooler before you refit it to the pump.
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