Armstrong World Industries EHU-704 User Manuals

Table of Contents

• WARNINGS

  2
• PRE-INSTALLATION

  4
• Check shipment

  4
• Check local codes

  4
• Site selection

  4
• INSTALLATION

  6
• Mounting

  6
• Electrical wiring

  6
• Water supply

  7
• Drain connection

  7
• Steam dispersion tube

  7
• Control wiring

  9
• High limit humidistat

  11
• Airflow switch

  11
• Audible alarm

  12
• Wiring diagram

  12
• DISPLAY (INSTRUMENT) PANEL

  13
• START-UP PROCEDURE

  14
• TROUBLESHOOTING GUIDE

  17
• Principle of operation

  17
• Operational guidelines

  18
• Diagnostics

  20
• WATER QUALITY AND TREATMENT

  23
• General

  23
• Conductivity too low

  23
• Conductivity too high

  24
• MAINTENANCE

  25
• Parts

  25
• Recommended maintenance

  29
• Steam generator maintenance, general

  29
• Tank removal and replacement

  30
• Chemical tank cleaning

  31
• Fill and drain valve repair

  33
• ELECTRODE REPLACEMENT

  33
• EHU-703,704

  33
• EHU-701, single and three phase

  34
• HUMIDISTAT DATA

  36
• Autocal Procedure

  36
• Sensor Failure Protection

  36
• High Limit Humidity Sensor

  38
• Humidity Set Point Reset by Outside Temperature

  38