HE420A STEAM POWER HUMIDIFIER

FINISH MOUNTING AND PLUMBING THE HUMIDIFIER

1.Mount the humidifier as instructed in the Select Location and Mount section.

2.Route the tubing to the humidifier float valve.

IMPORTANT

Keep the tubing away from sharp edges.

3.Connect the remaining end of the tubing to the humidifier float valve.

4.Open the saddle valve so the water flows slowly into the water pan.

5.Check the compression fittings at the saddle valve and the float valve. Tighten the fitting slightly to stop any leakage.

6.Connect the overflow provision of the humidifier to a suitable waste drain.

NOTE: 3/8 in. (9.525 mm) I.D. tubing can be easily attached to the overflow fitting.

7.Support the drain line at several locations to pre- vent kinks. Be sure to provide support near any heat source.

8.Use a male 1-1/2 in. NPT fitting (not supplied) to connect the humidifier overflow provision.

INSTALL THE AUTOMATIC

FLUSHING TIMER

Refer to the “Installation Instructions for the Programmable Humidifier Automatic Flushing Timer” for complete instruction.

INSTALL THE AUTOMATIC

HUMIDISTAT CONTROL

For additional humidistat installation instruction, refer to the manual “Wiring Instructions for High-Capacity Steam Humidifiers.”

WARNING

Electrocution Hazard. Disconnect electrical power to the furnace before beginning installation.

Sharp edges. Use caution when cutting plenum openings and handling ductwork

CAUTION

Do not mount the compensating humidistat on the supply duct or plenum. The unit will not withstand supply temperatures.

Do not set the humidity so high that condensation forms on windows or walls.

SELECT LOCATION AND MOUNT

1.Check contents of the humidistat carton. Compo- nents include:

• Automatic humidistat

•Outdoor temperature sensor

•Sensor shield

•Manual mode faceplate

•Mounting bracket

2.Disassemble the humidistat. Pull knob off, then remove the cover by inserting a screwdriver in the slot on the right side of the humidistat.

3.Mount the humidistat on the COLD AIR RETURN. Select a mounting location at least 6 inches upstream from the fresh air intake ductwork, if appli- cable.

4.Select an exterior location to mount the Outdoor Temperature Sensor. Location must meet the fol- lowing requirements. Incorrect indoor humidity lev- els will result if these requirements are not met.

•Mount on North, Northeast or Northwest side of house.

•Mount at least 3 feet from all exhaust vents.

•Mount above expected snow line.

NOTE: For manual operation, do not install the outdoor sensor wire.

5.Locate an existing Indoor/Outdoor access hole.

•Make sure there are no active high-voltage wires in the hole.

•As an alternative, the sensor can be mounted in the center of a 6-inch fresh air intake duct (must be no farther than 30 inches from the outside wall).

NOTE: If neither configuration is possible, the compen- sating humidistat can be installed to operate manually. See Installing the Humidistat to Oper- ate Manually, below.

6.Route the sensor wire to the selected location. Run wire between the compensating humidistat and the outdoor sensor lead. If the sensor is outdoors, snap the probe end of the sensor into the sensor shield and attach it to an exterior wall. The probe must be completely covered by the shield.

NOTE: Outdoor temperature sensor wire must not exceed 30 feet in length.

CAUTION

Do not run outdoor temperature sensor wire alongside wires carrying high voltage (120 VAC or higher). Do not run the sensor wire through conduit.

7.Attach the Sensor Wire to the humidistat. Strip the connecting wire 1/4 inch and attach the two internal wires to the terminals labeled “Outdoor Tempera- ture Sensor” on the humidistat.

8.Select a power source. The voltage to the humidis- tat must be between 22-30 VAC.

NOTE: The compensating humidistat will operate prop- erly only with a continuous power source. A min- imum 10 volt amperes is required.

9.Connect the humidistat to the humidifier. Strip the wires used for all the humidistat terminal connec- tions 1/4 inch.

10.Set the humidistat. Consult the compensating humi- distat homeowner's manual for proper humidity set- tings.

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Honeywell HE420A Finish Mounting and Plumbing the Humidifier, Install the Automatic Flushing Timer
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HE420A specifications

The Honeywell HE420A is a versatile and efficient whole-home humidification system designed for residential use. This unit is particularly noteworthy for its ability to enhance indoor air quality by adding moisture to the air, thus alleviating the discomfort associated with dry air in the home. With its advanced features and technologies, the HE420A stands out in the realm of humidifiers.

One of the key features of the HE420A is its evaporative technology. Unlike some humidifiers that simply spray water into the air, the HE420A uses a specially designed evaporative pad to absorb moisture. As air passes over the pad, it picks up humidity and distributes it evenly throughout the home. This mechanism not only ensures a consistent and comfortable humidity level but also helps to prevent the growth of mold and bacteria, common problems associated with overly wet environments.

The HE420A is designed for easy integration with existing HVAC systems, making it a practical choice for homeowners looking to enhance their indoor comfort without the need for additional equipment. The unit typically covers an area of up to 4,200 square feet, making it suitable for larger homes. Its capacity to deliver significant moisture output—up to 17 gallons per day—ensures that even during the driest winter months, residents can maintain a healthy humidity level.

Installation and maintenance are also user-friendly with the HE420A. The system features a built-in water panel and a user-friendly control panel that allows homeowners to easily monitor and adjust humidity levels according to their preferences. Additionally, the digital humidistat ensures accurate humidity readings and responds to fluctuations in the home environment, promoting energy efficiency.

Energy efficiency is another hallmark of the Honeywell HE420A. The unit operates quietly and consumes minimal energy, making it an environmentally friendly option that also helps reduce utility bills. It is equipped with features that optimize water usage and minimize waste, aligning with modern sustainability goals.

In summary, the Honeywell HE420A is an exemplary whole-home humidifier that combines effective humidification technology with easy installation and user-friendly features. Its evaporative design, generous coverage area, and energy-efficient operation make it an excellent choice for homeowners seeking to improve their indoor air quality and comfort. By incorporating the HE420A into their HVAC system, families can enjoy the benefits of balanced humidity levels year-round.
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