Honeywell HE420A 10F 78,500 ohms 23C, Or less than -32F -35.6C, Except in Test mode, Knob setting

Page 7

 

 

 

HE420A STEAM POWER HUMIDIFIER

APPENDIX A

 

 

 

 

 

 

 

Table 3. Compensating Humidistat Troubleshooting Guide.

 

 

 

 

 

 

 

PROBLEM

 

SOLUTION

 

NOTES

 

 

 

 

 

 

 

Humidifier does not

•

Confirm the outdoor temperature sensor is

 

 

 

operate in “Test”

 

connected to the correct terminals on the

 

 

 

mode.

 

humidistat. (For manual operation, ensure the

 

 

 

 

 

jumper pins are positioned correctly.)

 

 

 

 

• Check wiring diagram (Figure 1) for correct

 

 

 

 

 

installation.

 

 

 

 

• Check the voltage at the humidistat “24 VAC”

 

 

 

 

 

terminals. (Should be 22-30 VAC.)

 

 

 

 

• Ensure the control knob has not been left in the

 

 

 

 

 

“Test” position.

 

 

 

Humidifier only

•

Check the resistance of the sensor by removing

 

Temp/Resistance Chart

operates in “Test”

 

the leads from the humidistat terminals and

100°F

6000 ohms

38°C

mode.

 

measuring the resistance across the wires with

90°F

7500 ohms

32°C

 

 

an ohmmeter. Compare the reading to the

80°F

9500 ohms

27°C

 

•

temperature/resistance chart (right).

70°F

11,500 ohms

21°C

 

For automatic applications, make sure the

60°F

14,000 ohms

16°C

 

 

outdoor temperature sensor is mounted

50°F

18,000 ohms

10°C

 

 

completely outside the house (i.e. not recessed

40°F

23,000 ohms

4°C

 

 

into the hole) on the North, Northeast or

30°F

28,500 ohms

-1°C

 

 

Northwest side, away from direct sunlight. And is

20°F

37,000 ohms

-7°C

 

 

mounted at least 3 feet away from all exhaust

10°F

46,500 ohms

-12°C

 

•

vents.

0°F

61,500 ohms

-18°C

 

If the outdoor temperature sensor is mounted in

-10°F

78,500 ohms

-23°C

 

 

the fresh air intake duct, make sure the probe is

-20°F

105,500 ohms

-29°C

 

 

no further than 30 inches from an outside wall.

-30°F

135,000 ohms

-34°C

 

 

 

Notes:

 

 

 

 

 

In automatic applications, if the outdoor

 

 

 

temperature is greater than +50°F (+10°C)

 

 

 

or less than -32°F (-35.6°C), the

 

 

 

compensating humidistat will not operate

 

 

 

(except in “Test” mode).

 

 

 

 

In both automatic and manual applications,

 

 

 

if the relative humidity in the home is

 

 

 

higher than the knob setting, the

 

 

 

humidistat will not operate. Similarly, the

 

 

 

humidistat will not operate if the indoor RH

 

 

 

exceeds 45%.

 

Humidifier operates

•

Check the humidistat setting. If the RH in the

 

 

 

constantly.

 

home is less than the knob setting, the humidifier

 

 

 

 

 

will operate until the humidity level is higher than

 

 

 

 

 

the knob setting.

 

 

 

 

• In “Test” mode, verify that the humidifier will shut

 

 

 

 

 

off after approximately one minute.

 

 

 

 

• Check the resistance of the sensor.

 

 

 

 

• See previous Problem/Solution, regarding

 

 

 

 

 

outdoor temperature sensor mounting locations.

 

 

 

 

• Turn the humidistat “OFF” and observe whether

 

 

 

 

 

the humidifier turns off. If operation continues,

 

 

 

 

 

check Figure 1 wiring diagram. Remove the

 

 

 

 

 

wires from the humidistat's “OUT” terminals. If

 

 

 

 

 

humidifier continues to operate, check the

 

 

 

 

 

humidifier.

 

 

 

Humidifier or

•

Use a voltmeter to check for steady 22-30 VAC.

 

 

 

compensating

•

Make sure the outdoor temperature sensor

 

 

 

humidistat “chatters”

 

wiring does not run alongside the wires carrying

 

 

 

or clicks on and off

 

high voltage (120 VAC or higher).

 

 

 

rapidly.

 

 

 

 

 

Furnace or heat

•

It may be necessary to make a setting change on

 

 

 

pump blower system

 

the furnace or heat pump board to prevent the

 

 

 

runs continuously;

•

blower from shifting down to lowest idling speed.

 

 

 

condensation is

Consult the furnace/heat pump operating manual

 

 

 

building up in

 

or contact the manufacturer for procedures to

 

 

 

ductwork.

 

prevent low air flow.

 

 

 

7

69-1108—2

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Page 6 Page 8
Contents Application InstallationSelect 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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