Manuals / Armstrong World Industries / Household Appliance / Humidifier

Armstrong World Industries EHU-704 Application Example, Humidistat model number H270-69-13-10-31

Models: EHU-701 EHU-700 Series EHU-704 EHU-703

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APPLICATION EXAMPLE

Steam humidification system controlled by a 0 to 10 Vdc valve wired to output #1. Remote humidity display using 0 to 5 Vdc signal is wired to output #2. The humidity sensor is located in the return air duct. A proportional high limit humidity sensor is installed in the supply duct. An outdoor temperature sensor is installed in the fresh air duct.

	Humidistat model number: H270-69-13-10-31
	figure 42-1. Alternative humidistat wiring A17898 (H270)
	On/Off	Air Flow
	High Limit	Air Flow
	High Limit	Switch
	Humidistat	Switch
	Humidistat	(optional)
	(optional)	(optional)
	(optional)
	Humidifier	Outside Air
	Connection	Outside Air
	Connection
	Terminals	Humidifier
		Humidifier
		Location
		Exhaust Air
	Humidifier	Main Humidity Sensor
	Connections

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Armstrong World Industries EHU-704, EHU-700 Series, EHU-703 Application Example, Humidistat model number H270-69-13-10-31

Contents

Installation and Maintenance Series EHU-700 HumidifiersPlease Read And Save These Instructions DANGER ELECTRICAL SHOCK HAZARD HIGH VOLTAGES EXIST INSIDE THE HUMIDIFIERMETAL TOOLS AWAY FROM THESE AREAS INSTALLATION TABLE OF CONTENTSSECTION 1 PREPARATION AND INSTALLATION PRE-INSTALLATIONCHECK LOCAL CODES PRE-INSTALLATIONin locations where unusual instances of 1 CHECK SHIPMENTWater TotalModel unit IMPORTANT Please observe the following INSTALLATION5 ELECTRICAL SERVICE WIRING 4 MOUNTING THE HUMIDIFIER7 CONNECT DRAIN 6 WATER FILL SUPPLYhumidifier Figure 8-1. Pipe size may 9 CONTROL HUMIDISTAT CONTROL WIRING6 - 10 Ft Wall Mounted Control Humidistat10 HIGH LIMIT DUCT HUMIDISTAT 11 AIRFLOW SWITCHNOTE LIMIT SWITCHES HIGH LIMIT AND AIRFLOW SWITCHES OPEN ON FAULT Duct Mounted Control HumidistatBoard 12 AUDIBLE ALARMTANK OFF LIGHT MODE BUTTON, INDICATOR, and DISPLAYINSTRUMENT PANEL FILL LIGHT DRAIN LIGHTSTART-UP PROCEDURE FOR ARMSTRONG SERIES EHU-700 HUMIDIFIERS BEFORE TURNING ON THE POWERTURN 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 freely7 Let the unit continue to fill and allow the water to boil a The stat demand reading will decrease to zero17 Close and lock the doors, and store the key away from the unit 16 Turn power off, if humidification is not neededTROUBLESHOOTING GUIDE FIER BECAUSE THIS SWITCH DISCONNECTS THE STEAM GENERATOR TANK ONLYPRINCIPLE OF OPERATION - AN OVERVIEW OPERATIONAL GUIDELINES Tank Contactor OperationMonitoring Stat Demand Manual Drain Mode Monitoring % PowerMonitoring Current Automatic Drain OperationC00 NORMAL OPERATION C01 HIGH WATER EHU-700 DIAGNOSTICSDIAGNOSTIC DISPLAY MESSAGES C02 TANK NEEDS CLEANINGC07 OVERCURRENT FAILURE C04 HIGH LIMIT CIRCUITC05 DRAIN SYSTEM FAILURE C06 FILL SYSTEM FAILUREC09 I/O DIAGNOSTICS GENERAL How does this affect maintenance?WHEN WATER CONDUCTIVITY IS TOO LOW Indicators WATER QUALITY AND TREATMENT FOR EHU SERIES HUMIDIFIERSRemedies WHEN WATER CONDUCTIVITY IS TOO HIGH IndicatorsResults RemedyDescription EHU-701, -703, -704 Series Electronic Steam Humidifier Repair PartsSteam Generators Complete Steam Generator PartsSee Drawings on Page Valves and Mechanical PartsDescription Used OnUsed On Electrical PartsItem Not Shown DescriptionFigure 28-2. EHU-700 Steam Generator Repair Parts List Figure 28-1. EHU-700 Parts ListTank Cleaning MAINTENANCERECOMMENDED MAINTENANCE SCHEDULE STEAM GENERATOR MAINTENANCE GeneralTANK 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 REPLACEMENTMODEL EHU-701, SINGLE AND THREE PHASE FILL AND DRAIN SYSTEM REPAIR GeneralDrain System Failure Fill System Failure SENSOR FAILURE PROTECTION AUTOCAL PROCEDURESPECIFICATIONS HUMIDISTAT DATASENSOR OUTPUT DIMENSIONSTABLE 5 SENSOR CHARACTERISTICS Voltage between black and white wire, terminals #6 and #7HUMIDITY SET POINT RESET BY OUTSIDE TEMPERATURE AIR SUPPLY HIGH LIMIT HUMIDITY SENSORHumidistat model number H270-69-13-10-31 APPLICATION EXAMPLEDescription Dimensional InformationLimited Warranty and Remedy Dimensions

APPLICATION EXAMPLE

Humidistat model number: H270-69-13-10-31