HE420A STEAM POWER HUMIDIFIER

APPENDIX B

Table 4. Safety Control Relay (SCR) Operation and Troubleshooting Guide.

Condition

Cause

Action Required

 

 

 

SCR LED shows rapid series of red,

Condition Normal. SCR processor is

No action required.

green, and yellow lights, followed by

powering up and checking internal

 

no LED display.

operation.

 

Humidifier won't operate. No SCR

Problem! SCR circuit is not closing or

Check SCR power; check humidistat

LED display.

humidistat is not calling for humidity.

operation. If humidity is about 45% or

 

 

outdoor temperature is above 50°F,

 

 

the humidifier won't operate unless the

 

 

humidistat is set to Test mode.

Humidifier operates. SCR LED shows

Condition Normal. This is a test phase.

No action required.

continuous yellow.

SCR will wait 30 minutes to detect

 

 

furnace blower operation. If the

 

 

furnace blower is detected, the system

 

 

will function properly.

 

Humidifier won't operate. SCR LED

Problem! During the 30 minute test

Turn the humidistat off, then on again,

shows continuous red.

phase, the SCR failed to detect the

to reset the system. Although unlikely

 

furnace blower and turned the

to occur, this failure/reset process can

 

humidifier off.

occur twice before further action is

 

 

necessary.

Humidifier operates. SCR LED shows

Condition Normal. All systems

No action required.

continuous green.

(furnace, humidistat, humidifier and

 

 

SCR) are operating properly.

 

Humidifier won't operate. SCR LED

Problem! The SCR failed to detect the

Contact your HVAC contractor ASAP

shows flashing red.

furnace blower for the third time and,

to check out and repair the system.*

 

as a safety precaution, has locked out

 

 

the humidifier. This is an indication

 

 

that some aspect of the system

 

 

(furnace, humidistat, humidifier or

 

 

SCR) has malfunctioned.

 

*Before the SCR can be reset, the system must be checked and repaired by a licensed contractor. To reset the SCR, insert a rigid, small-diameter object (e.g. paperclip) into the smallest hole in the face of the SCR, next to the green connector block. This, too, should be performed by an HVAC contractor.

Automation and Control Solutions

 

 

 

Honeywell International Inc.

Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North

35 Dynamic Drive

Golden Valley, MN 55422

Scarborough, Ontario M1V 4Z9

customer.honeywell.com

 

 

 

® U.S. Registered Trademark

 

 

 

© 2006 Honeywell International Inc.

 

 

 

 

 

 

69-1108—2 M.S. Rev. 04-06

 

 

 

 

 

 

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Honeywell HE420A installation instructions Appendix B
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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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