1.DisconnectelectricalpowertotheHVACandshutoffwatersupply. 2.Disconnectthewaterlineattheinletcompressionnut. 3.Removethein-linestrainerfrominsidetheinletsideofthevalvebyusingasmallnailorwire. 4.Flushthein-linestrainercleanorreplacewithanewstrainer,PartNo.4004.5.Reconnecttheinletwaterline.DoubleWrenchtoPreventLeaking. 6.Disconnectthewaterfeedtubeattheoutletcompressionnut. 7.Inspectthewaterfeedtubebygentlyflexingitandlookingforcracksorsignsofwear.Replacetubeifitiscracked,brittle, orhasbeendamaged.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. . . . . .

5. Remove Water Panel evaporator (5) from the Scale Control Insert (3). Scrape the Insert with a putty knife or similar tool and flush clean with water. Install new Water Panel evaporator (Stock No. 35) with black colored spot up. Snap plastic cover into tray and tray into Scale Control Insert. 6. Remove the drain hose from the bottom of the unit and bend and flex it to loosen the internal calcium deposits. Then flush it with water under pressure and slip it back onto the black drain fitting (6)

• To upgrade both PCBs and the software use a PCB service upgrade kit. The part numbers to order are as follows: Model Part number Model Part number MR480 043040791 MR720 043040793 MR700 043040792 MR730 043040794 • For humidifiers with Rev F or later PCBs, you will only be required to purchase individual boards for repairs (as detailed in sect. 8.9). • If a revision H or later power PCB needs replacing, the replacement power PCB must also be revision H or later. Replacing revision F or earlier p

Float Cover 11. Float 12. Water Level Sensor Assembly 1. Note Humidifier Control setting and turn dial to the “OFF” position. 2. Turn off water supply. Turn the integral bypass damper (3) to the “SUMMER” position. 3. Press the tabs in the latches on the top and bottom of front cover (1) and pull cover off base with both hands. 4. Carefully pull the plastic feed tube (2) out of the distribution tray (5) at the top of the Water Panel evaporative assembly (4). Tip the Water Panel evaporative assemb

To determine the indoor RH, slowly turn the knob clockwise and counterclockwise and listen for 2 clicks. The indoor RH is within the range of the 2 clicks. CHECKTHEHUMIDIFIEROPERATION AUTOMATIC DIGITAL HUMIDIFIER CONTROL Set the knob to “Test/Reset”, make sure that the water saddle valve is open and that there is electricity to the humidifier. The HVAC system must be operating for the humidifier to function. Note: Turning the knob to “Test/Reset” resets the “Change Water Panel” timer. The humidi

. . . .4 •AutomaticMode ..........................................5 •ManualMode ............................................6 Operating Instructions – Models 350, 360, 500M, 600M & 700M . . . . . .9 Checkthe Humidifier Operation ..................................9 AdditionalInformationforAllModels ............................10 EffectofWaterCharacteristics .................................10 AnnualMaintenance .........................................11 AnnualSummerShutdown ......................

READ AND SAVE THESE INSTRUCTIONS ® HUMIDIFIERS The Best Cure For Dryness® OWNER’S MANUAL FOR MODELS 768, 760, 568, 560, 558, 550, 448, 445, 360, 350, 110, 112, 220, 224, & 440 Includes Safety, Operating and Maintenance Instructions and Warranty TABLE OF CONTENTS PAGE Introduction ................................................Inside Front Cover Principle of Operation ............................................................1 Operating Instructions •Automatic Humidifier Control...............

Slip drain line back onto the drain fitting. Make sure the drain line has a constant downward slope and is not flattened or blocked. 10. Turn on the water supply. Return integral bypass damper to appropriate position. 11. Check system operation: Manual Humidifier Control (Models 500M & 600M): With the HVAC blower operating, turn up Humidifier Control and check system operation. Digital Humidifier Control (Models 500 & 600): (Automatic or Manual mode) Check system operation and reset Change Water

PERIODIC PREVENTATIVE MAINTENANCE NOTE: Periodic inspection and preventive maintenance of your total heating system is important for efficient and safe operation. Your heating contractor should include humidifier service at the same time. All models are equipped with an in-line water strainer and orifice as shown below. These parts should be inspected and cleaned periodically to assure continued proper unit performance. INSPECTION AND SERVICE INSTRUCTIONS IN-LINE STRAINER 1. Disconnect electrica