Installation and Maintenance
Series EHU-700 Humidifiers
Please Read And Save These Instructions
DANGER ELECTRICAL SHOCK HAZARD
HIGH VOLTAGES EXIST INSIDE THE HUMIDIFIER
METAL TOOLS AWAY FROM THESE AREAS
INSTALLATION
TABLE OF CONTENTS
SECTION 1 PREPARATION AND INSTALLATION
PRE-INSTALLATION
CHECK LOCAL CODES
PRE-INSTALLATION
in locations where unusual instances of
1 CHECK SHIPMENT
Water
Total
Model unit
IMPORTANT Please observe the following
INSTALLATION
5 ELECTRICAL SERVICE WIRING
4 MOUNTING THE HUMIDIFIER
7 CONNECT DRAIN
6 WATER FILL SUPPLY
humidifier Figure 8-1. Pipe size may
9 CONTROL HUMIDISTAT
CONTROL WIRING
6 - 10 Ft
Wall Mounted Control Humidistat
10 HIGH LIMIT DUCT HUMIDISTAT
11 AIRFLOW SWITCH
NOTE LIMIT SWITCHES HIGH LIMIT AND AIRFLOW SWITCHES OPEN ON FAULT
Duct Mounted Control Humidistat
Board
12 AUDIBLE ALARM
TANK OFF LIGHT
MODE BUTTON, INDICATOR, and DISPLAY
INSTRUMENT PANEL
FILL LIGHT DRAIN LIGHT
START-UP PROCEDURE FOR ARMSTRONG SERIES EHU-700 HUMIDIFIERS
BEFORE TURNING ON THE POWER
TURN ON POWER AT THE CIRCUIT BREAKER
b The unit will shut down, lighting the Tank Off light
9 Press the Drain switch. Verify that the unit is draining freely
7 Let the unit continue to fill and allow the water to boil
a The stat demand reading will decrease to zero
17 Close and lock the doors, and store the key away from the unit
16 Turn power off, if humidification is not needed
TROUBLESHOOTING GUIDE
FIER BECAUSE THIS SWITCH DISCONNECTS THE STEAM GENERATOR TANK ONLY
PRINCIPLE OF OPERATION - AN OVERVIEW
OPERATIONAL GUIDELINES
Tank Contactor Operation
Monitoring Stat Demand
Automatic Drain Operation
Monitoring % Power
Manual Drain Mode
Monitoring Current
C00 NORMAL OPERATION C01 HIGH WATER
EHU-700 DIAGNOSTICS
DIAGNOSTIC DISPLAY MESSAGES
C02 TANK NEEDS CLEANING
C07 OVERCURRENT FAILURE
C04 HIGH LIMIT CIRCUIT
C05 DRAIN SYSTEM FAILURE
C06 FILL SYSTEM FAILURE
C09 I/O DIAGNOSTICS
GENERAL
How does this affect maintenance?
WHEN WATER CONDUCTIVITY IS TOO LOW Indicators
WATER QUALITY AND TREATMENT FOR EHU SERIES HUMIDIFIERS
Remedies
WHEN WATER CONDUCTIVITY IS TOO HIGH Indicators
Results
Remedy
Description
EHU-701, -703, -704 Series Electronic Steam Humidifier Repair Parts
Steam Generators Complete
Steam Generator Parts
See Drawings on Page
Valves and Mechanical Parts
Description
Used On
Used On
Electrical Parts
Item Not Shown
Description
Figure 28-2. EHU-700 Steam Generator Repair Parts List
Figure 28-1. EHU-700 Parts List
Tank Cleaning
MAINTENANCE
RECOMMENDED MAINTENANCE SCHEDULE
STEAM GENERATOR MAINTENANCE General
TANK REMOVAL AND REPLACEMENT - ALL MODELS
STEAM GENERATOR CHEMICAL CLEANING PROCEDURE
Page
MODELS EHU-703 AND 704, SINGLE AND THREE PHASE
TANK DISASSEMBLY, CLEANING, AND ELECTRODE REPLACEMENT
MODEL EHU-701, SINGLE AND THREE PHASE
FILL AND DRAIN SYSTEM REPAIR General
Drain System Failure
Fill System Failure
SENSOR FAILURE PROTECTION
AUTOCAL PROCEDURE
SPECIFICATIONS
HUMIDISTAT DATA
SENSOR OUTPUT
DIMENSIONS
TABLE 5 SENSOR CHARACTERISTICS
Voltage between black and white wire, terminals #6 and #7
AIR SUPPLY HIGH LIMIT HUMIDITY SENSOR
HUMIDITY SET POINT RESET BY OUTSIDE TEMPERATURE
Humidistat model number H270-69-13-10-31
APPLICATION EXAMPLE
Description
Dimensional Information
Limited Warranty and Remedy
Dimensions