Honeywell Humidifier HE420A User Manual

READ AND SAVE THESE INSTRUCTIONS

HE420A Steam Power Humidifier

INSTALLATION INSTRUCTIONS

APPLICATION

The HE420A Steam Power Humidifier uses a thermal fan

interlock control to provide humidification for the whole

house. The steam power humidifier is designed to work

with high efficiency furnaces and heat pumps.

INSTALLATION

IMPORTANT

This product is for residential applications only

and must be installed by a qualified HVAC con-

tractor. Failure to comply could invalidate the

product warranty, or result in serious injury or

electrocution.

M10536B

SELECT LOCATION AND MOUNT

Fig. 1. Mount humidifier horizontally under duct

using mounting bracket.

WARNING

Electrocution, Heavy Equipment and

Chemical Hazard.

Can cause death, blindness, water damage to

home and heater failure.

•

Do not cut into any air conditioning or

electrical line.

•

Wear safety glasses when cutting or drilling.

Mount the humidifier in a level position to

avoid water damage and heater failure.

Reinforce duct as necessary to ensure

stability.

•

There are three typical ways of mounting the steam

humidifier. See Fig. 1, 2, and 3. Be sure to select a

location where the humidifier can be plugged in without

an extension cord. The preferred installation location is

on the warm air side of the furnace. If that location is not

possible, the humidifier should be mounted a minimum of

6 ft (1.8m) upstream from the furnace filter. Depending

on the location selected, additional duct reinforcement

may be necessary because the humidifier weighs 18 lb

when filled with water.

M10578B

Fig. 2. Mount humidifier horizontally under duct.

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HE420A STEAM POWER HUMIDIFIER

IMPORTANT

Mount Horizontally On Reinforced Duct

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.

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.

4. Install the chlorine removal filter.

5. Place the brass compression nut over the copper

tubing.

6. Slide the brass ferrule over the tubing.

5. Remove the sheet metal.

NOTE: Do not overtighten the compression nut.

Moderate tightness prevents leaking.

IMPORTANT

Do not mount the humidifier until the water level

is adjusted. See the Plumbing section.

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.

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.

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.

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.

SET THE WATER LEVEL

Create and install the duct extension. Follow the steps in

the Mount Horizontally Using Mounting Bracket section to

complete installation.

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.

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.

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.

PLUMBING THE HUMIDIFIER

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.

CAUTION

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.

Chemical Hazard.

TO RAISE WATER LEVEL

TO LOWER WATER LEVEL

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

humidifier.

PUSH

DOWN

HOLD

DOWN

IMPORTANT

PUSH

Use only copper tubing to plumb the humidifier.

1. Locate the cold water pipe closest to the humidifier.

2. Install the saddle valve connector.

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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HE420A STEAM POWER HUMIDIFIER

•

Outdoor temperature sensor

Sensor shield

Manual mode faceplate

Mounting bracket

FINISH MOUNTING AND PLUMBING

THE HUMIDIFIER

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.

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.

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.

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.

•

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.

NOTE: 3/8 in. (9.525 mm) I.D. tubing can be easily

attached to the overflow fitting.

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).

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.

•

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.

INSTALL THE AUTOMATIC

FLUSHING TIMER

Refer to the “Installation Instructions for the

Programmable Humidifier Automatic Flushing Timer” for

complete instruction.

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.

INSTALL THE AUTOMATIC

HUMIDISTAT CONTROL

NOTE: Outdoor temperature sensor wire must not

exceed 30 feet in length.

For additional humidistat installation instruction, refer to

the manual “Wiring Instructions for High-Capacity Steam

Humidifiers.”

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.

WARNING

Electrocution Hazard. Disconnect electrical

power to the furnace before beginning

installation.

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.

Sharp edges. Use caution when cutting plenum

openings and handling ductwork

8. Select a power source. The voltage to the humidis-

tat must be between 22-30 VAC.

CAUTION

NOTE: The compensating humidistat will operate prop-

erly only with a continuous power source. A min-

imum 10 volt amperes is required.

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.

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.

SELECT LOCATION AND MOUNT

1. Check contents of the humidistat carton. Compo-

nents include:

•

Automatic humidistat

69-1108—2

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HE420A STEAM POWER HUMIDIFIER

Table 1. Humidity Settings.

Outdoor Temperature °F

Installing the Humidistat to Operate

Manually

Dial

Position

1. Locate the three-pin arrangement marked AUTO/

MAN protruding from the control board (right of wir-

ing connections).

-10

15% 20% 25% 30% 35% 40%

20% 25% 30% 35% 40% 45%

25% 30% 35% 40% 45% 45%

30% 35% 40% 45% 45% 45%

2. Pull upward to remove the black, two-pin connector

from the auto position. Reinstall it in the manual

position (on the center and right-hand pins).

Manual Operation

CAUTION

Do not attach sensor wire to the blue wiring

connection block.

For MANUAL operation, apply the manual mode decal to

the faceplate. Once the unit is installed in the cold air

return and internally set to MANUAL, turn the dial to the

expected outdoor temperature. The corresponding

optimal humidity level has been calibrated for you. For

example, by setting the dial to an anticipated 20°F, the

humidistat automatically maintains the indoor relative

humidity in the safe, comfortable 35% range (see Table 2

below).

3. Follow Steps 8 (select a power source) and 9 (Con-

nect the humidistat to the humidifier) to complete

the wiring. Apply the manual mode faceplate to the

compensating humidistat cover. Reattach the cover

to the base and reinstall the knob.

HUMIDISTAT OPERATING

INSTRUCTIONS

Table 2. Recommended Relative Humidity.

Outside Temperature

Recommended RH

+40°F

+30°F

+20°F

+10°F

0°F

45%

40%

35%

30%

25%

20%

15%

With automatic humidity control, you can control your

humidifier almost effortlessly, because:

•

Once the knob has been set, the humidistat

automatically adjusts the indoor relative humidity

based on outdoor temperature and your desired

humidity level.

-10°F

-20°F

•

The humidistat calculates the optimal humidity so you

don't have the problems associated with indoor

condensation.

The humidistat’s temperature condensation capability

automatically turns itself on in cold weather, off in

warm weather.

The humidistat’s humidity and temperature sensors

are solid-state, which means there are no mechanical

parts, and no problems associated with dust.

In extreme cold weather, relative humidity must be

reduced to prevent condensation on windows and interior

surfaces. Otherwise, the excess moisture will eventually

cause damage to your home.

Additional Features

•

When outdoor temperature exceeds 50°F (10°C), the

humidistat will function in Test mode only.

When indoor relative humidity exceeds 45%, the

humidistat will not operate.

Test Mode—Manual test the humidistat by turning the

knob to the far right. The unit will energize the internal

relay for one minute, allowing you to confirm proper

operation.

Automatic Operation

Once the humidistat is installed in the cold air return and

internally set to AUTOMATIC, turn the dial to 5 (the

standard humidity control setting).

Allow the humidity to stabilize for at least two days (home

size, furnace efficiency, and personal comfort preference

may affect the length of time necessary). At that point, you

may reset the dial to 6 for more humidity, or 4 for less

humidity. Continue adjusting the dial until you reach your

optimal indoor humidity level, and leave the dial in this

position.

•

Manual Off—In Manual mode, turn the humidistat OFF

during warm months by turning the knob to the far left.

(This is not necessary in Automatic mode.)

HUMIDISTAT CHECKOUT

Remember that in AUTO mode, the dial is not showing

relative humidity, but your preferred humidity setting

based on Table 1.

IMPORTANT

If conditions exceed 50°F or 45 percent relative

humidity, it may be necessary to perform this

test.

Table 1. Humidity Settings.

Outdoor Temperature °F

Dial

1. To conduct a system test, ensure that 24 VAC is

applied to the 24 VAC terminals of the compensat-

ing humidistat.

2. Reattach the humidistat cover and knob to the

base.

3. Rotate the knob on the humidistat clockwise to the

“Test” position.

Position

-10

10% 10% 10% 15% 20% 25%

10% 10% 15% 20% 25% 30%

10% 15% 20% 25% 30% 35%

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HE420A STEAM POWER HUMIDIFIER

a. If set up correctly, the humidifier will begin oper-

ating. In “Test” mode, the humidistat will operate

for approximately one minute.

b. If the humidifier does not activate properly in

“Test” mode, refer to Appendix A.

CHECK THE HUMIDIFIER

OPERATION

After installation is complete, use the following steps to

check the humidifier operation:

4. Set the humidistat. Refer to Humidistat Operating

Instructions for detailed instruction on initial settings.

a. If home is occupied, set the knob to “5”, or for

manual operation, set the knob to 35%.

b. If home is vacant, turn the knob to counterclock-

wise to “Off.”

1. Turn on the humidifier water supply.

2. Be sure the humidifier has power and then plug in

the humidifier.

3. Turn the Humidity Control to the Test position.

NOTE: If relative humidity is above 45% in the home, or

the outdoor temperature is above 50°F, a jumper

may need to be placed across the humidistat’s

OUT terminals to perform this checkout.

INSTALL THE SAFETY CONTROL

SHUTOFF

Refer to the manual “Wiring Instructions for High-Capacity

Steam Humidifiers” (page 11) for complete instruction on

installing the Safety Control Shutoff.

4. Check that the furnace blower comes on to circulate

the moist air. The blower may take as long as fifteen

minutes to start.

5. Refer to the Humidity Control owner’s manual for

operation.

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HE420A STEAM POWER HUMIDIFIER

APPENDIX A

Table 3. Compensating Humidistat Troubleshooting Guide.

PROBLEM

SOLUTION

NOTES

Humidifier does not

operate in “Test”

mode.

•

Confirm the outdoor temperature sensor is

connected to the correct terminals on the

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

operates in “Test”

mode.

•

Check the resistance of the sensor by removing

the leads from the humidistat terminals and

measuring the resistance across the wires with 90°F

an ohmmeter. Compare the reading to the

temperature/resistance chart (right).

For automatic applications, make sure the

outdoor temperature sensor is mounted

completely outside the house (i.e. not recessed 40°F

into the hole) on the North, Northeast or 30°F

Northwest side, away from direct sunlight. And is 20°F

mounted at least 3 feet away from all exhaust

vents.

If the outdoor temperature sensor is mounted in -10°F

the fresh air intake duct, make sure the probe is -20°F

no further than 30 inches from an outside wall.

Temp/Resistance Chart

100°F

6000 ohms

7500 ohms

9500 ohms

38°C

32°C

27°C

21°C

16°C

10°C

4°C

80°F

70°F

60°F

50°F

11,500 ohms

14,000 ohms

18,000 ohms

23,000 ohms

28,500 ohms

37,000 ohms

46,500 ohms

61,500 ohms

78,500 ohms

105,500 ohms

135,000 ohms

•

-1°C

-7°C

10°F

0°F

-12°C

-18°C

-23°C

-29°C

-34°C

•

-30°F

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

constantly.

•

Check the humidistat setting. If the RH in the

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.

Make sure the outdoor temperature sensor

wiring does not run alongside the wires carrying

high voltage (120 VAC or higher).

compensating

humidistat “chatters”

or clicks on and off

rapidly.

Furnace or heat

pump blower system

runs continuously;

condensation is

building up in

•

It may be necessary to make a setting change on

the furnace or heat pump board to prevent the

blower from shifting down to lowest idling speed.

Consult the furnace/heat pump operating manual

or contact the manufacturer for procedures to

prevent low air flow.

ductwork.

69-1108—2

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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

LED display.

Problem! SCR circuit is not closing or Check SCR power; check humidistat

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

shows continuous red.

Problem! During the 30 minute test

phase, the SCR failed to detect the

furnace blower and turned the

humidifier off.

Turn the humidistat off, then on again,

to reset the system. Although unlikely

to occur, this failure/reset process can

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

shows flashing red.

Problem! The SCR failed to detect the Contact your HVAC contractor ASAP

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.

1985 Douglas Drive North

Golden Valley, MN 55422

customer.honeywell.com

Honeywell Limited-Honeywell Limitée

35 Dynamic Drive

Scarborough, Ontario M1V 4Z9

® U.S. Registered Trademark

69-1108—2 M.S. Rev. 04-06

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