Armstrong World Industries EHU-703 - Manual (Page 3)

TABLE OF CONTENTS
3
SECTION 1: PREPARATION AND INSTALLATION
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
SECTION 2: START-UP AND OPERATION
DISPLAY (INSTRUMENT) PANEL............................................................................... 13
START-UP PROCEDURE.............................................................................................. 14
SECTION 3: TROUBLESHOOTING AND MAINTENANCE
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
TANK DISASSEMBLY,
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