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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 contractor. Failure to comply could invalidate the product warranty, or result in serious injury or electrocution.

SELECT LOCATION AND MOUNT

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.

Fig. 1. Mount humidifier horizontally under duct

using mounting bracket.

M ID

IFIE

IFICATEU

H UM

IFIER

MIDIFICATEU

M10536B

M10578B

Fig. 2. Mount humidifier horizontally under duct.

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HE420A STEAM POWER HUMIDIFIER

HUMIDIFIER

HUMIDIFICATEUR

Mount Horizontally Using Mounting Bracket (Preferred Mounting Method)

IMPORTANT

The duct must be at least 10 in. (254 mm) wide to use this mounting method.

The duct is strongest when using the bracket mounting method because the least amount of duct reinforcement is required because of the bracket location. See Fig. 1. However, in some installations, reinforcement may still be necessary to help support the weight of the humidifier and keep the humidifier level.

Position the bracket 1/2 in. (13 mm) from the edge of the duct and trace around the bracket. See Fig. 4.

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

M10580B

Fig. 3. Mount humidifier horizontally under duct

extension using mounting bracket.

CAUTION

Steam Condensation, Fire and Freezing Water Hazard. Can cause failure of fan or limit control or result in water damage to home.

• Do not install the humidifier where the sidewalls of the return air duct are constructed of wood (i.e. floor joist).

• Do not Install the humidifier where the temperature is lower than 32°F (O°C) or higher than 200°F (93°C).

• For all installation configurations, the mounting area must be strong enough to support the humidifier's weight when it is full of water (approximately 18 lbs.), and to hold the humidifier in a level position for safe, reliable operation. Otherwise, additional duct reinforcement will be necessary.

• If the installation includes exposed insulated materials, a section of the ductwork must be removed and replaced with rigid metal duct extending at least 6 feet downstream from the humidifier.

• Mount the unit at least 4-to-6 feet after the plenum transition. Avoid sudden turns or transitions in the ductwork in the immediate area downstream from the humidifier.

There are three possible mounting procedures:

• horizontally under at least a 10 in. (254 mm) wide duct using the mounting bracket (preferred mounting);

• horizontally under a reinforced duct;

• horizontally under a duct extension using the mounting bracket.

Decide which mounting is appropriate and follow those mounting instructions.

1/2 IN. (13 MM) FROM EDGE

BRACKET

M23374

Fig. 4. Position bracket to duct edge.

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.

IMPORTANT

Follow the dotted line carefully.

5. Remove the sheet metal.

6. Use two 8-32 screws and nuts to attach the mount-

ing bracket (L shaped with six holes) to the top/front surface of the humidifier. The humidifier is now ready for mounting.

NOTE: Position the humidifier so the upward protrusion

of the U is on the side toward the reservoir.

IMPORTANT

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

7. Slide the flanges of the humidifier reservoir into the

mounting bracket until the reservoir’s front flange comes into contact with the edge of the duct.

8. Secure the humidifier to the duct with three no. 8

sheet metal screws.

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HE420A STEAM POWER HUMIDIFIER

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.

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.

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

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

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 center 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.

TO RAISE WATER LEVEL

PUSH DOWN

Fig. 5. Adjusting the water level.

TO LOWER WATER LEVEL

HOLD DOWN

PUSH UP

M10581

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