Honeywell HCM-631N - Quietcare 3 Gallon Owner's Manual page 6

While the TrueSTEAM and its available filtration options help to address the issue of water quality and hardness,
homes with extreme hard water problems should consider using a whole house water softener as the primary
filtration device. Use of a whole house water softener will help protect the humidifier from excessive maintenance
requirements as well as undue wear and tear in homes with hard water.
In applications with a water softener, it is critical for the TrueSTEAM to draw its water supply from the cold water
line after the water softener.
Note: Be sure to check all local plumbing codes before beginning installation.
Hard water source
4
Use TrueSTEAM with water that is less than 1 grain per
BEST gallon hardness. A properly functioning water softener will
accomplish this.
PRACTICE
Cold softened water
Water
Heater
Water
Softener
TrueSTEAM draws water
from cold water line after
whole house water softener
When using softened
water, use of the in-line
polyphosphate filter is
recommended
TrueSTEAM Humidification System 69-2285—01
Furnace
M32903