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. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Materials Provided and Not Provided . . . . . . . . . . . . . . . . . . 3 Electrical Specifications, Capacities and Weights . . . . . . . . 4 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Overview of Humidifier Operation . . . . . . . . . . . . . . . . . . . . . 7 INSTALLATION Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Setting Slide Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Choosing a Location for Humidifier Components . . . . . . . . 13 Distribution Tube Installation . . . . . . . . . . . . . . . . . . . . . . . 15 Mounting the Humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Airflow Proving Switch Installation . . . . . . . . . . . . . . . . . . . 23 Supply Water and Drain Piping . . . . . . . . . . . . . . . . . . . . . . 23 TABLE OF CONTENTS ATTENTION INSTALLER This product must be installed by qualified HVAC and electrical contractors. Failure to do so voids product warranty due to possible product misapplication. This product must be installed in compliance with local, state, and federal codes. CAUTION 1. Do not set humidity higher than recommended. Condensation damage may result. 2. Failure to follow the instructions in this manual for installation of distribution tube, airflow proving switch, and high humidity limit switch may cause condensation damage. OPERATION Start-up Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 MAINTENANCE Inspect and Service the Humidifier. . . . . . . . . . . . . . . . . . .29 Off-season Shut Down Procedure . . . . . . . . . . . . . . . . . . . .31 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 APPENDIX – ABSORPTION DISTANCE CALCULATION. . . . . . . . . . . . . . . . . . . . . . . . . .38 WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Back Cover WARNING 1. 240 volts may cause serious injury or death from electrical shock. Disconnect power before installing supply wiring. 2. Water temperature in excess of 140°F (60°C) may cause serious injury due to burns. Allow unit to cool before draining or removing chamber. 3. The humidifier chamber, distribution assembly, and all connected hose or piping may contain or discharge hot steam and/or hot water at 212°F (100°C). Discharged steam is not visible. Contact with hot surfaces, discharged hot water, or air into which steam has been discharged may cause severe personal injury. 4. Water pressure greater than 80 psi (550 kPa) may cause the humidifier to overflow. 5. Humidifier weighs up to 80 lbs when operating. Improper mounting of humidifier may cause humidifier to fall from wall or ceiling resulting in serious injury. Mount humidifier to a structurally stable surface per the instructions in this manual. 6. Failure to properly ground unit may result in property damage due to fire, or serious injury or death from electrical shock. 7. Failure to follow the instructions in this manual may cause moisture to accumulate, which may cause bacteria and mold growth or dripping water into building spaces. Dripping water may cause property damage. PRODUCT OVERVIEW Aprilaire Steam Humidifiers create steam by boiling water inside a steam chamber. This is accomplished by the transfer of energy from electric heating elements to the water inside the chamber. A three-level water probe is used to determine when to turn on and off a water fill valve in order to bring water into the chamber. Once the chamber is full and there is a call for humidity from the Automatic Steam Humidifier Control, the heating elements will be energized causing the water to boil. The boiling water creates steam which, due to the moderate pressurization of the chamber that comes from boiling, is forced through the vapor hose and steam distribution tube into the duct system. As water is boiled off, the water level in the steam chamber will drop. The water probe will sense when it reaches a low point and will cause the fill valve to open. The process of boiling the water in the steam chamber will cause minerals and impurities in the water to drop out. Depending on the hardness and quality of the water, this can create a substantial build-up within the steam chamber. The unit will drain the chamber periodically to help clean the steam chamber and reduce the amount of cleaning required during maintenance. Aprilaire Steam Humidifiers are controlled by an Automatic Steam Humidifier Control mounted in the return duct that will sense the relative humidity (RH) in the return air. If the return air is below the RH setpoint, the control will send the humidifier a signal to begin producing steam. Once this happens, the airflow proving switch (included) will c...
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