Honeywell HE420A installation instructions Wiring, Plumbing the Humidifier, SET the Water Level

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Mount Horizontally On Reinforced Duct

This horizontal mounting method usually requires duct reinforcement to support the weight of the humidifier and keep it level. The mounting bracket is not used. See Fig. 2.

1.Position the bracket to the bottom of the duct in the desired location. Be sure the bracket is level.

2.Once the outline has been traced, remove bracket.

3.Drill a 3/8 in. (10 mm) hole within the center portion of the bracket.

4.Use tin snips to cut around the outline of the bracket.

5.Remove the sheet metal.

IMPORTANT

Do not mount the humidifier until the water level is adjusted. See the Plumbing section.

6.Slide the flanges of the humidifier reservoir into the mounting bracket.

7.Secure the humidifier to the duct with two no. 8 sheet metal screws.

Mount Horizontally On Vertical Duct

Horizontal mounting on a vertical duct requires the installation of a duct extension. Additional duct reinforcement may also be necessary to help support the weight of the humidifier and keep it level. See Fig. 3.

Create and install the duct extension. Follow the steps in the Mount Horizontally Using Mounting Bracket section to complete installation.

WIRING

All wiring must comply with local codes and ordinances. For complete wiring instructions, refer to the manual “Wiring Instructions for High-Capacity Steam Humidifiers” packaged with your HE420A humidifier.

PLUMBING THE HUMIDIFIER

CAUTION

Chemical Hazard.

Can cause damage to environment or air conditioning system.

Do not use any refrigerant line connected to an air conditioner.

Be sure to install the chlorine removal filter (provided) to prevent humidifier corrosion.

HE420A STEAM POWER HUMIDIFIER

IMPORTANT

Position the valve so water flows from the top or side to reduce the chance of clogging the valve with minerals.

Lightly clean the copper tubing ends with fine sandpaper before making any connections. Do not use any line connected to an air conditioner.

4.Install the chlorine removal filter.

5.Place the brass compression nut over the copper tubing.

6.Slide the brass ferrule over the tubing.

NOTE: Do not overtighten the compression nut. Moderate tightness prevents leaking.

7.Insert the tubing into the valve fitting and tighten the compression nut.

8.Flush the copper tubing to remove any debris that can cause problems at the float valve.

9.Route the tubing to the humidifier float valve, keep- ing the tube away from sharp edges.

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

11.Open the saddle valve so that the water flows slowly and gently into the water pan.

SET THE WATER LEVEL

CAUTION

Flooding Hazard.

Inadequate support of the float arm can lead to valve seat damage resulting in water leakage. Support the float arm during adjustment.

Adjust the humidifier water level prior to mounting.

1.Set the humidifier reservoir on a level surface.

2.Attach the water feed line and allow the unit to fill until the float valve shuts off the incoming flow of water. The water level should be between 2-1/4 in. (57 mm) and 2-1/2 in. (64 mm) deep. If water level is correct, skip to step 4.

3.Adjust the water level in small increments. Raise the water level by pushing down on the center of the float arm. Lower the water level by pressing the float down with one hand and pulling up on the cen- ter of the float arm with the other hand. See Fig. 5.

4.Verify the water level by removing enough water to allow the float valve to automatically fill and shut off the water.

NOTE: Either hard or soft water can be used in the humidifier.

IMPORTANT

Use only copper tubing to plumb the humidifier.

1.

Locate the cold water pipe closest to the humidifier.

2.

Install the saddle valve connector.

TO RAISE WATER LEVEL

PUSH

DOWN

TO LOWER WATER LEVEL

HOLD

DOWN

PUSH

UP

M10581A

3. Use the valve instructions to install the valve (pro-

vided). The valve is self-piercing when installed on

copper pipe.

Fig. 5. Adjusting the water level.

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69-1108—2

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Contents Installation ApplicationSelect Location and Mount Follow the dotted line carefully Position bracket to duct edgeMount Horizontally On Reinforced Duct WiringPlumbing the Humidifier SET the Water LevelKeep the tubing away from sharp edges Install the Automatic Flushing TimerInstall the Automatic Humidistat Control Finish Mounting and Plumbing the HumidifierHumidistat Checkout Humidistat Operating InstructionsCheck the Humidifier Operation Install the Safety Control ShutoffCompensating Make sure the outdoor temperature sensor Except in Test modeHigher than the knob setting, Knob settingAppendix B

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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