Filter
Top Products
INSTALLATION INSTRUCTIONS
69-1108-2
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.
Fig. 1. Mount humidifier horizontally under duct
using mounting bracket.
Fig. 2. Mount humidifier horizontally under duct.
M10536B
H
U
M
I
D
I
F
I
E
R
H
U
M
I
D
I
F
I
C
A
T
E
U
R
M10578B
H
U
M
I
D
I
F
I
E
R
H
U
M
I
D
I
F
I
C
A
T
E
U
R