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Honeywell HE240 - User Manual

Honeywell HE240
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69-2685ES-01
INSTALLATION GUIDE/OWNER’S MANUAL
HE240, HE280
Humidifier and
Installation Kit
M33322
SAVE THIS DOCUMENT
FOR FUTURE REFERENCE
69-2685ES_A.book Page 1 Friday, March 9, 2012 11:57 AM

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Questions and Answers

  • T
    Timothy SextonJul 26, 2025
    What to do if my Honeywell HE240 is leaking water?
    • O
      ofryeJul 26, 2025
      If your Honeywell Humidifier is leaking water, the issue could be leaking joints. Shut off the water supply and tighten the connections. Also, verify that brass tubing inserts are used. Another potential cause is a leaking saddle valve; ensure the rubber pad is installed on the saddle valve.
  • D
    Daniel Miller DVMJul 31, 2025
    Why is my Honeywell Humidifier not producing enough humidity?
    • T
      Tiffany RussoJul 31, 2025
      If your Honeywell Humidifier isn't producing enough humidity, consider the following: * Ensure the furnace blower is operating correctly by checking the circuit breaker, power, wiring, humidity control setting, and pressure switch tubing. If issues persist, contact a professional heating contractor. * Minimize drafts by keeping doors and windows closed, closing the fireplace damper when not in use, minimizing exhaust fan operation, and sealing around doors and windows. * Check that the damper is set to the 'winter' position to enable humidification.
  • D
    Danielle PenningtonAug 5, 2025
    Why is my Honeywell HE240 producing low humidity?
    • J
      Jasmine WarnerAug 5, 2025
      Several factors can cause low humidity with your Honeywell Humidifier. The furnace blower might not be operating, so check the circuit breaker or fuse, ensure the furnace power is on, verify wiring connections, check the humidity control setting, and inspect the pressure switch tubing. Rapid air changes and drafts can also contribute, so keep doors and windows closed, close the fireplace damper when not in use, minimize exhaust fan running time, and seal around doors and windows. Finally, ensure the damper is set to the "winter" position to allow humidification.
  • C
    Cindy JacksonAug 10, 2025
    How to fix air leakage in Honeywell HE240?
    • S
      Sarah JonesAug 11, 2025
      To fix air leakage in your Honeywell Humidifier, check duct joints and seal them with foil tape.
  • R
    Robert FowlerAug 15, 2025
    Why is there no water draining from my Honeywell HE240 Humidifier?
    • J
      Jose HenryAug 15, 2025
      If there is no water draining from your Honeywell Humidifier, several components need checking. Start by verifying the control circuit wiring and all connections. Then, turn the humidistat up and down to listen for a clicking sound. Confirm the outlet has power, and if other wiring components are okay, turn on the furnace fan and listen for the solenoid to click while adjusting the humidistat. Check the plumbing connections for kinks. Ensure the saddle valve pierces the water line and is open. Remove the humidifier cover to check if water flows into the distribution tray. Finally, verify the drain tubing is free from obstructions.
  • R
    Robert HernandezAug 20, 2025
    What to do if my Honeywell HE240 is causing high humidity?
    • L
      Lindsay TaylorAug 21, 2025
      If your Honeywell Humidifier is causing high humidity, which leads to condensation on walls, turn off the humidity control and water until the condensation evaporates. If you notice heavy condensation on windows, lower the humidity control to reduce moisture from activities like bathing or cooking. If the problem continues, you may need to improve ventilation.

Summary

Safety Definitions

WARNING

Indicates a hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION

Indicates a hazardous situation which, if not avoided, could cause bodily injury or property damage.

Safety Precautions

Serious Personal Injury Hazard

Can cause electrical shock and injury from moving parts. Disconnect power and shut off water supply before removing cover.

Hazardous Voltage

Can cause personal injury or equipment damage. Do not cut or drill into any air conditioning or electrical accessory.

Chemical Hazard

Can cause personal injury or equipment damage. Do not use any line connected to an air conditioner. Do not use gas line.

Temperature and Static Pressure Hazard

Can cause property or equipment damage. Locate humidifier where ambient temperature is between 32 and 120 °F (0 to 49 °C).

Sharp Edges Installation Hazard

Can cause personal injury. Wear gloves and safety glasses.

WELCOME

How Your Humidifier Works

Explains the principle of operation where warm air picks up moisture from a water-soaked pad.

Model Specific Features

Highlights the HE280's water savings technology, saving up to 30% water.

APPLICATION

PREPARING FOR THE INSTALLATION

Included Accessories

Lists all accessories provided in the kit, including ducting, wiring, humidistat, and hardware.

Required Tools

Lists the necessary tools for installation, such as tin snips, screwdrivers, and drills.

Determining Best Location for Humidifier

Typical humidifier installation locations

Illustrates common installation points on supply or return ducts and furnace body.

Selecting Location for Humidistat

Selecting duct location for humidistat

Shows best and alternate locations for mounting the humidistat in the return air duct.

Locating Closest 120 V Electrical Outlet

INSTALLATION

Disassembling humidifier

Illustrates the steps to take apart the humidifier unit for installation on the duct.

Installing humidifier on duct

Cutting bypass opening

Details how to cut the circular opening for the bypass duct using a drill and template.

Connecting bypass ducting

Connecting Bypass Ducting Details

Explains how to secure the flex duct to the humidifier and home's ductwork with connector straps and foil tape.

Connecting the Plumbing

Installing the saddle valve

Instructions for installing the self-piercing saddle valve to tap into the water supply line.

Installing feed tubing

Details how to connect the 1/4 in. OD tubing from the saddle valve to the solenoid inlet.

Connecting the Drain Tubing

Connecting the Pressure Switch

Installing the Humidistat

Humidistat base and rear view

Shows the humidistat base, gasket, and rear connection points for wiring.

Slide the foam gasket onto the base

Illustrates sliding the foam gasket onto the humidistat base bracket.

Secure the base bracket to the duct

Shows how to attach the humidistat base bracket to the duct using mounting screws.

WIRING

Wiring the controls and the HE240

Provides a wiring diagram for connecting the solenoid valve, humidistat, and transformer for the HE240 model.

Wiring the controls and the HE280

Provides a wiring diagram for connecting the solenoid valve, humidistat, and transformer for the HE280 model.

TESTING HUMIDIFIER OPERATION

Checklist

A list of items to verify before turning on the humidifier for operation testing.

Controlling Your Humidity Settings

Explains how to adjust the H8908 Humidistat based on outdoor temperature and indoor activities.

MAINTAINING YOUR HUMIDIFIER

Setting Your Humidistat

Table 2 provides recommended humidistat control settings based on outside temperature.

Once per year, depending on water quality

Procedure for cleaning the humidifier, including pad replacement and mineral deposit removal.

Cleaning your humidifier

End of Humidification Season

Replacement Humidifier Pads

Vacation

Start of the Humidification Season

TROUBLESHOOTING YOUR HUMIDIFIER

Water leakage

Troubleshooting steps for identifying and fixing water leaks from joints or the saddle valve.

No water to drain

Checks for electrical, humidistat, solenoid, plumbing, saddle valve, and drain tube issues causing no water flow.

Air leakage

Guidance on checking and sealing duct joints to prevent air leaks.

Low humidity

Furnace blower not operating

Checks for blown fuses, furnace power, wiring, and control settings affecting blower operation.

Rapid air changes

Tips to reduce air changes and drafts that can increase humidity load.

High humidity

Damper in summer position

Instruction to set the damper blade to 'winter' position to allow humidification.

Condensation on walls

Advice on reducing condensation by adjusting humidity control or increasing ventilation.

LIMITED ONE-YEAR WARRANTY

Honeywell HE240 Specifications

General IconGeneral
Water Capacity17 gallons per day
Control TypeManual
Coverage AreaUp to 3, 000 sq. ft.
MountingDuct
Voltage24V

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