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
SECTION 1 PREPARATION AND INSTALLATION
TABLE OF CONTENTS
PRE-INSTALLATION
INSTALLATION
in locations where unusual instances of
PRE-INSTALLATION
1 CHECK SHIPMENT
CHECK LOCAL CODES
Water
Total
Model unit
5 ELECTRICAL SERVICE WIRING
INSTALLATION
4 MOUNTING THE HUMIDIFIER
IMPORTANT Please observe the following
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
NOTE LIMIT SWITCHES HIGH LIMIT AND AIRFLOW SWITCHES OPEN ON FAULT
11 AIRFLOW SWITCH
Duct Mounted Control Humidistat
10 HIGH LIMIT DUCT HUMIDISTAT
Board
12 AUDIBLE ALARM
INSTRUMENT PANEL
MODE BUTTON, INDICATOR, and DISPLAY
FILL LIGHT DRAIN LIGHT
TANK OFF LIGHT
START-UP PROCEDURE FOR ARMSTRONG SERIES EHU-700 HUMIDIFIERS
BEFORE TURNING ON THE POWER
TURN ON POWER AT THE CIRCUIT BREAKER
7 Let the unit continue to fill and allow the water to boil
9 Press the Drain switch. Verify that the unit is draining freely
a The stat demand reading will decrease to zero
b The unit will shut down, lighting the Tank Off light
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
Manual Drain Mode
Monitoring % Power
Monitoring Current
Automatic Drain Operation
DIAGNOSTIC DISPLAY MESSAGES
EHU-700 DIAGNOSTICS
C02 TANK NEEDS CLEANING
C00 NORMAL OPERATION C01 HIGH WATER
C05 DRAIN SYSTEM FAILURE
C04 HIGH LIMIT CIRCUIT
C06 FILL SYSTEM FAILURE
C07 OVERCURRENT FAILURE
C09 I/O DIAGNOSTICS
WHEN WATER CONDUCTIVITY IS TOO LOW Indicators
How does this affect maintenance?
WATER QUALITY AND TREATMENT FOR EHU SERIES HUMIDIFIERS
GENERAL
Results
WHEN WATER CONDUCTIVITY IS TOO HIGH Indicators
Remedy
Remedies
Steam Generators Complete
EHU-701, -703, -704 Series Electronic Steam Humidifier Repair Parts
Steam Generator Parts
Description
Description
Valves and Mechanical Parts
Used On
See Drawings on Page
Item Not Shown
Electrical Parts
Description
Used On
Figure 28-2. EHU-700 Steam Generator Repair Parts List
Figure 28-1. EHU-700 Parts List
RECOMMENDED MAINTENANCE SCHEDULE
MAINTENANCE
STEAM GENERATOR MAINTENANCE General
Tank Cleaning
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
SPECIFICATIONS
AUTOCAL PROCEDURE
HUMIDISTAT DATA
SENSOR FAILURE PROTECTION
TABLE 5 SENSOR CHARACTERISTICS
DIMENSIONS
Voltage between black and white wire, terminals #6 and #7
SENSOR OUTPUT
AIR SUPPLY HIGH LIMIT HUMIDITY SENSOR
HUMIDITY SET POINT RESET BY OUTSIDE TEMPERATURE
Humidistat model number H270-69-13-10-31
APPLICATION EXAMPLE
Limited Warranty and Remedy
Dimensional Information
Dimensions
Description