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Honeywell HE420A Owner's Manual
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Honeywell HE420A Owner's Manual

Honeywell HE420A Owner's Manual

Steam power humidifier
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Download this manual See also: Owner's Manual, Manual
READ AND SAVE THESE INSTRUCTIONS
HE420A Steam Power Humidifier
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.
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.
INSTALLATION INSTRUCTIONS
Fig. 1. Mount humidifier horizontally under duct
using mounting bracket.
H U
M ID
H U
IF
IE
M ID
R
IF
IC
AT
EU
R
Fig. 2. Mount humidifier horizontally under duct.
H U
M ID
H U
IF
M ID
IE
R
IF
IC
AT
EU
R
M10536B
M10578B
69-1108-2

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Summary of Contents for Honeywell HE420A

  • Page 1 READ AND SAVE THESE INSTRUCTIONS HE420A Steam Power Humidifier 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.
  • Page 2 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. BRACKET...
  • Page 3 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.
  • Page 4 HE420A STEAM POWER HUMIDIFIER FINISH MOUNTING AND PLUMBING THE HUMIDIFIER 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.

  • Page 5: Humidistat Checkout

    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. HE420A STEAM POWER HUMIDIFIER Table 1. Humidity Settings. Outdoor Temperature °F Recommended RH +40°F +30°F +20°F...

  • Page 6: Check The Humidifier Operation

    After installation is complete, use the following steps to check the humidifier operation: 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.
  • Page 7 • In “Test” mode, verify that the humidifier will shut off after approximately one minute. • Check the resistance of the sensor.
  • Page 8 HE420A STEAM POWER HUMIDIFIER APPENDIX B Table 4. Safety Control Relay (SCR) Operation and Troubleshooting Guide. Condition SCR LED shows rapid series of red, green, and yellow lights, followed by no LED display. Humidifier won't operate. No SCR LED display.