AprilAire 600 Whole-House Humidifier Instruction Manual

Introduction

This manual provides essential information for the installation, operation, and maintenance of your AprilAire Model 600 Whole-House Humidifier. Please read these instructions thoroughly before proceeding with installation or use to ensure proper function and longevity of the unit.

The AprilAire Model 600 is designed to integrate with your forced air furnace system, providing optimal humidity levels throughout your home. It features an automatic digital control that monitors both outdoor temperature and indoor relative humidity to maintain desired conditions.

AprilAire 600 Whole-House Humidifier with digital control — **Figure 1: AprilAire 600 Whole-House Humidifier.** This image shows the main humidifier unit and its accompanying digital control panel.

Included Components

The following components are included with your AprilAire 600 Humidifier:

AprilAire 600 Humidifier with Built-in Bypass Damper
Model 60 Automatic Digital Humidistat Control with Sensor
Model 35 Water Panel Evaporator
24 VAC Transformer
Outdoor Temperature Sensor
Saddle Valve
Solenoid Valve
Installation Instructions and Template

Components included in the AprilAire 600 Humidifier box — **Figure 2: Included Components.** This image displays all the parts typically found in the AprilAire 600 humidifier package, including the main humidifier unit, digital control, water panel, transformer, outdoor sensor, saddle valve, and solenoid valve.

Setup and Installation

Installation of the AprilAire 600 Whole-House Humidifier involves integration with your existing HVAC system. Due to the complexity of HVAC and electrical connections, professional installation is recommended. If you choose to perform the installation yourself, ensure you have a thorough understanding of HVAC systems, electrical wiring, and plumbing, and always follow local codes and safety guidelines.

Installation Overview:

Location Selection: Choose an appropriate location on your furnace plenum for the humidifier unit.
Ductwork Modification: Cut the necessary openings in the plenum using the provided template.
Mounting the Humidifier: Securely attach the humidifier unit to the plenum.
Water Connection: Connect the humidifier to a cold water supply using the saddle valve and tubing. Ensure all connections are watertight.
Drain Connection: Route the drain line to a suitable drain.
Electrical Wiring: Connect the 24 VAC transformer, solenoid valve, and digital control according to the wiring diagrams provided in the separate installation manual.
Outdoor Temperature Sensor: Install the outdoor temperature sensor in an appropriate location outside your home and connect it to the digital control.

Diagram showing AprilAire humidifier integrated with a furnace and ductwork — **Figure 3: Whole-House Humidification System.** This diagram illustrates how the AprilAire humidifier integrates with your home's HVAC system, showing the flow of dry warm air into the humidifier, through the water panel, and then as humidified air distributed throughout the home.

Refer to the detailed installation instructions provided in the box for specific wiring diagrams and step-by-step procedures. Ensure all power is disconnected before beginning any electrical work.

Operating Instructions

The AprilAire 600 Humidifier features an automatic digital control (Model 60) designed for ease of use and optimal humidity management.

Automatic Digital Control (Model 60):

Close-up of the AprilAire Model 60 Automatic Digital Humidifier Control — **Figure 4: Automatic Digital Control.** This image shows the Model 60 digital control panel, featuring the indoor humidity display, automatic mode dial, blower activation switch, and indicator lights for service, water panel change, and humidifier operation.

Indoor Humidity Display: Shows the current indoor relative humidity percentage.
Automatic Mode Dial: Set the desired humidity level. The control uses dual sensors (indoor humidity and outdoor temperature) to automatically adjust output and prevent window condensation.
Blower Activation Switch:
- ON: Humidifier runs continuously, or whenever the furnace blower is active.
- OFF: Humidifier only runs when the furnace calls for heat and the blower is active.
Indicator Lights:
- Humidifier On: Illuminates when the humidifier is actively producing humidity.
- Change Water Panel: Indicates when the Model 35 Water Panel needs replacement.
- Call Dealer for Service: Signals a potential issue requiring professional attention.

AprilAire 600 Humidifier with text 'Automatic Humidifier Dual Sensors Monitor and Respond to Both Outdoor Temperature and Indoor Relative Humidity' — **Figure 5: Automatic Humidifier Function.** This image highlights the dual sensor capability of the AprilAire 600, which automatically monitors and responds to both outdoor temperature and indoor relative humidity to maintain optimal levels.

Setting Humidity: For optimal health and comfort, AprilAire recommends maintaining indoor relative humidity between 40% and 60%. Adjust the automatic mode dial to your preferred setting. The system will then automatically manage humidity output based on indoor conditions and outdoor temperature to prevent over-humidification and condensation.

Maintenance

Regular maintenance ensures the efficient and effective operation of your AprilAire 600 Humidifier.

Water Panel Replacement:

The Model 35 Water Panel Evaporator should be replaced annually, or when the "Change Water Panel" indicator light illuminates on the digital control. The frequency may vary depending on water quality and humidifier usage.

Turn off power to the humidifier and furnace.
Remove the humidifier cover.
Slide out the old Water Panel and discard it.
Insert a new AprilAire Model 35 Water Panel, ensuring it is correctly seated.
Replace the humidifier cover and restore power.

General Cleaning:

Periodically inspect the humidifier for mineral buildup, especially in the water distribution tray and drain pan. Clean these components as needed using a mild detergent and water. Ensure all parts are thoroughly rinsed before reassembly.

It is recommended to perform a thorough cleaning at the beginning of each heating season or before extended periods of non-use.

Troubleshooting

This section addresses common issues you might encounter with your AprilAire 600 Humidifier.

Problem	Possible Cause	Solution
Humidifier not producing humidity.	No power to the unit. Water supply turned off or saddle valve closed. Solenoid valve malfunction. Water Panel is dry or clogged. Digital control setting too low or in "OFF" mode.	Check electrical connections and circuit breaker. Ensure water supply is open and saddle valve is fully open. Inspect solenoid valve for debris or damage. Replace Water Panel (Model 35). Adjust digital control to a higher setting or switch Blower Activation to "ON".
"Change Water Panel" light is on.	Water Panel needs replacement.	Replace the Model 35 Water Panel as described in the Maintenance section.
"Call Dealer for Service" light is on.	System malfunction detected.	Contact a qualified HVAC technician or AprilAire customer support for diagnosis and repair.
Excessive water usage or leaks.	Saddle valve fully open (too much flow). Loose water connections. Clogged drain line.	Adjust the saddle valve to reduce water flow, ensuring the Water Panel remains wet. Check all water connections for tightness. Clear any obstructions in the drain line.

If troubleshooting steps do not resolve the issue, please contact AprilAire Customer Support or a certified HVAC professional.

Specifications

Feature	Detail
Model Number	600
Humidification Type	Evaporative
Coverage Area (Tight Homes)	Up to 5,000 sq. ft.
Coverage Area (Average Homes)	Up to 2,500 sq. ft.
Coverage Area (Loose Homes)	Up to 1,700 sq. ft.
Capacity	17 Gallons Per Day (GPD)
Product Dimensions (H x W x D)	15.75 x 15.38 x 10.25 inches
Weight	8.7 Pounds
Control Type	Automatic Digital Control (Model 60)
Power Requirement	24 VAC (Transformer included)
Water Panel Model	35

Diagram showing the dimensions of the AprilAire 600 Humidifier — **Figure 6: Product Dimensions.** This image provides a visual representation of the AprilAire 600 humidifier's width, height, and depth measurements.

AprilAire 600 Humidifier with text 'Whole-House Coverage Covers up to 2,500 Sq. Ft. in Average Constructed Homes with a Capacity of 17 Gallons per Day' — **Figure 7: Whole-House Coverage.** This image highlights the AprilAire 600's capacity to cover up to 2,500 sq. ft. in average constructed homes, with a daily output of 17 gallons.

Table showing AprilAire Model 600 home sizing based on construction type — **Figure 8: Home Sizing Guide.** This table details the recommended coverage area for the AprilAire Model 600 humidifier (17 GPD capacity) based on home construction tightness: Tight (up to 5,000 sq. ft.), Average (up to 2,500 sq. ft.), and Loose (up to 1,700 sq. ft.).

Warranty Information

AprilAire products are designed and manufactured in the USA, reflecting a commitment to quality and reliability. Specific warranty details, including coverage period and terms, are typically provided with your product documentation or can be found on the official AprilAire website. Please retain your proof of purchase for warranty claims.

For detailed warranty information, please refer to the warranty card included in your product packaging or visit the AprilAire official website.

Customer Support

If you have questions regarding the installation, operation, or maintenance of your AprilAire 600 Humidifier, or if you require technical assistance, please contact AprilAire Customer Support.

Contact Information:

Website: www.aprilaire.com
Phone: Refer to the AprilAire website or product packaging for the most current contact numbers.

When contacting support, please have your product model number (600) and date of purchase available.

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