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Edwards EXT255H Series - User Manual

Edwards EXT255H Series
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B722-20-880
Issue D Original
Instruction Manual
Low Voltage EXT Compound Molecular Pumps:
EXT70H 24V, EXT70Hi 24V
*
, EXT255H 24V and EXT255Hi 24 V
* The EXT70Hi 24 V pump is an EXT70H/ISO63 24 V pump with an interstage-port accessory fitted. Refer to the text of this
instruction manual for further information.
Description Item Number
EXT70H/ISO63 24 V B722-21-991
EXT70H/CF63 24 V B722-22-991
EXT70H/NW40 24 V B722-23-991
EXT70H/ISO100 24 V B722-26-991
EXT255H/ISO100 24 V B753-01-991
EXT255H/CF100 24 V B753-02-991
EXT255Hi/ISO100 24 V B753-03-991
EXT255H/ISO100 24 V (Coarse Inlet Screen) B753-05-991

Table of Contents

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Edwards EXT255H Series Specifications

General IconGeneral
Inlet flangeNW40
Outlet flangeNW25
Operating voltage380-415V
Frequency50/60 Hz
Flow RateUnknown
Maximum HeadUnknown
HorsepowerUnknown
Voltage380-415V
Inlet SizeNW40
Outlet SizeNW25
MaterialUnknown
WeightUnknown

Summary

Technical Data

Pumping Media

Lists suitable gases, conditions for oxygen/water vapour, and warnings for explosive or aggressive gases.

Installation

Unpack and Inspect

Instructions for safely unpacking, checking for damage, and verifying contents of the pump shipment.

Connect to the Vacuum System

Guides on connecting the pump to the vacuum system, covering inlet, backing, and interstage connections.

Vent-Valve Connection and Control

Explains how to connect and control vent valves, including manual and solenoid types, and vent-restrictors.

Electrical Installation

Covers electrical connections, including the EXDC drive module, grounding, and safety precautions.

Cooling

Outlines cooling requirements, recommending water-cooling or forced-air for different operating conditions.

Operation

Start-up

Step-by-step guide for starting the EXT pump system, including backing pump and drive module.

Shut-down

Procedures for safely shutting down the EXT pump, including emergency shutdown and vent valve operation.

Maintenance

Fault Finding

Lists common pump symptoms, checks, and recommended actions for troubleshooting and resolving issues.

Service, Spares and Accessories

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