Page 12
506746−01 05/12
SLP98 / icomfort enabled
CBX40UHV / CBX32MV ONLY
icomfort
t
enabled
outdoor unit
icomfort
Touch
®
thermostat
Note 1. Humidification must be added in icomfort Touch
®
thermostat during commissioning. Refer to icomfort
Touch
®
Installer Guide for details.
Note 2. 48G96 relay field supplied.
Note 3. Remove factory jumper between AB−AB.
C
NO
48G96
Relay
Alarm
terminals
(if used)
(not
used)
(not
used)
(not
used)
Required Air Proving
Switch (provided)
NO
C
NC
C
NO
GND
24VAC
N2
GND
N1
AB
AB
GND
IN
Humidifier
low voltage
wiring panel
Figure 15. Humidifier with icomfort Touch
®
thermostat used as humidistat with an icomfort
t
en-
abled SLP98 gas furnace or icomfort
t
enabled CBX40UHV or CBX32MV air handler
S
Humidification is controlled by the humidity sensor in the thermostat. When the humidity in the space falls below the thermo-
stat’s humidity RH set point, a demand message for humidification is sent to the HVAC unit control board.
S
The demand message starts the indoor blower and sends a 24 volt signal from the H" terminal on the furnace control to the
humidifier isolation relay coil. The isolation relay contacts close to complete the circuit from GND" and IN" terminals on the
humidifier controller.
S
When the indoor blower achieves sufficient speed, the air proving switch contacts close completing the circuit from "AB" to
"AB" on the humidifier controller. Steam production will now start and continue until the humidity demand is satisfied.
S
When the RH set point is reached, the thermostat removes the demand to the furnace board which removes the 24 volt output
from the H" terminal and opens the isolation relay circuit and, in turn, opens the circuit between GND" and IN" on the humidi-
fier controller, stopping steam production. The indoor blower will be turned off (if not running due to a heating demand or ther-
mostat blower demand).
