If the pump will be located inside an enclosure, ensure that there is adequate ventilation so that the ambient
temperature around the pump does not exceed 40 °C.
Natural convection cooling: For some light pumping duties, with an ambient air temperature less than 30 °C,
natural convection cooling may be adequate to cool the nEXT pump.
Forced air cooling: The ambient air temperature when using forced air cooling must be 5 °C to 35 °C. Ensure
that there is an adequate supply of cooling air to the pump.
Water cooling: Use water cooling with an ambient air temperature greater than 35 °C or when using a
bakeout band (CF variants only). When using water cooling, ambient air temperature must be less than 40 °C
and the water temperature must be between 10 °C and 20 °C.
Edwards recommends that, wherever possible, the pump is cooled by forced air cooling or water cooling.
Refer to Tab le 6 for further performance information.
3.10.2 Forced air cooling
Air cooling accessories are available for nEXT pumps (refer to Section 7.4). Fit the air cooler as described in the
instruction manual supplied with it. If an alternative fan is used for air cooling, ensure that the flow rate is above
100 m
3
h
-1
(60 cfm).
The air cooler can be powered by a customer external power supply, the Edwards TIC Turbo and Instrument
Controller, the TIC Turbo Controller or the nEXT Controller. It cannot be powered by the controller if a TAV solenoid
valve is already connected to the controller. Follow the electrical connection instructions in the air cooler manual
to wire the lead of the air cooler into the controller connector supplied with the pump (refer to Figure 9). Plug the
connector into the socket at the side of the controller (refer to Figure 12).
The customer controller can be configured to drive an air cooler only if commands can be sent via the serial interface
or an Edwards TIC Turbo and Instrument Controller or Turbo Controller.
3.10.3 Water cooling
To prevent condensation inside the pump and controller, turn off the cooling water when the pump is switched
off.
A WCX water cooler accessory is available for the nEXT pumps (refer to Section 7.4). Fit it 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
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