I N D O O R A I R Q U A L I T Y
HCWB3
Healthy Climate
®
By-Pass Humidifier
Bulletin No. 210543
September 2009
Model Number Identification
HCWB 3 - 17 A
Unit Type
HCWB
= Healthy Climate By-Pass Humidifier
Nominal Capacity
12 = 12 US Gallons per day
17 = 17 US Gallons per day
Features
WARRANTY
All covered components - limited warranty for five
years in residential applications, one year in non-
residential applications.
Refer to the Lennox Equipment Limited Warranty
certificate included with the unit for additional details.
APPROVALS
Units are UL listed per ANSI/UL 998 and CSA C22.2
No.104-01.
APPLICATIONS
Applicable to most forced air installations.
Installs on the supply air plenum with a by-pass duct
from the return plenum in up-flow and horizontal
applications. Installs on the return air plenum with a
by-pass duct from the supply plenum in down-flow
applications. See Typical Applications.
Provides additional humidity to the home during the
heating season to increase comfort level.
Do not install where freezing may occur.
Humidifier, saddle valve and manual or automatic
humidifier control (depending on model) shipped in one
package.
Sequence of Operation
Humidifier will only operate when indoor blower is
operating.
When the level of moisture in the return air or living
space area drops below the set point of the humidifier
control, the water solenoid valve opens, water flows
into distribution tray and weeps down through the
evaporator pad. By-pass air flows over the evaporator
pad, increasing the humidity of the air, and then back
into the return air stream. When the humidifier control
is satisfied the water solenoid valve closes.
Cabinet
Rugged, corrosion resistant molded plastic.
Humidifier is shipped for left-hand by-pass duct
connection.
For right-hand by-pass duct connection, rotate
humidifier cabinet 180º top for bottom and relocate
drain spud. See Installation Instructions for additional
details.
Built-in damper included to close off bypass duct during
summer cooling operation.
E N G I N E E R I N G D ATA
Series
Controls
(blank) - Manual Humidistat
A = Automatic Humidifier Control
Automatic Humidifier Control
(furnished with “A” Models)
Manual Humidistat
(furnished with
standard Models)
