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Page 33
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Installation
B722-40-880 Issue H
3.9
Cooling
3.9.1
Introduction
CAUTION
Ensure that the pump is adequately cooled to prevent damage to the rotor and bearing.
CAUTION
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 DX 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 when the ambient air temperature is 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. See
for further performance information.
3.9.2
Forced air cooling
Air-cooling accessories are available for DX pumps (refer to
). 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 70
m
3
h
-1
(40 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 by the Podule. It cannot be powered by the Podule if a TAV solenoid valve is
already connected to the Podule. Follow the electrical connection instructions in the air-cooler manual to wire the
lead of the air cooler into the Podule connector supplied with the pump (refer to
). Plug the connector into
the socket at the top of the Podule (refer to
).
The Podule 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.
3.9.3
Water cooling
CAUTION
To prevent condensation inside the pump and Podule, turn off the cooling water when the pump is switched off.
A WCX water cooler accessory is available for the DX pumps (refer to
). Apply a thin layer of thermal grease
to the mounting face of the water cooler then fit it as described in the instruction manual supplied with it. The
cooling water supply must comply with the specification given in
. Pipes in the water cooling circuit may
become blocked if the cooling water contains too much calcium carbonate or if it contains particles that 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. If in doubt, check the quality of the 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.
