Armstrong World Industries EHU-703 User Manual
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....................................................................................
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