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HE420A STEAM POWER HUMIDIFIER
369-1108—2
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 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.
Fig. 5. Adjusting the water level.
TO RAISE WATER LEVEL
PUSH
DOWN
TO LOWER WATER LEVEL
HOLD
DOWN
PUSH
UP
M10581
A