Page 14
506746−01 05/12
C
NO
ON DIP
1 2
3
4
ON
OFF
OFF
ON
HC DIGITAL AUTOMATIC HUMIDISTAT
DIP SWITCH SETTINGS FOR HUMIDISTAT−
ONLY OPERATION
1
2
5G0
6G
7AOUT
8G0
9NTCE
10DIN
Outdoor
Sensor
Outdoor AC Unit
48G96 SPDT Interlock Relay
Thermostat
Typical Air Handler / Fur-
nace Control (AHC or IFC)
Alarm
terminals
(if used)
(not
used)
Required Air Proving
Switch (provided)
HC Digital
Automatic
Humidistat
(Cat.. no.
Y3760)
NO
C
NC
C
NO
GND
24VAC
N2
GND
N1
AB
AB
GND
IN
Humidifier
low voltage
wiring panel
Note 1. Blower interlock is required.
Note 2. 48G96 relay field supplied.
Note 3. Set signal type to 1" for modulating (Step 5, Figure
22 [Page 17]).
Note 4. Remove factory jumper between AB−AB.
Note 5. Connected for Modulating Operation.
Figure 17. Humidifier with HC Digital Automatic Humidistat connected for modulating operation
S
Steam production is modulated between 20% and 100% of the maximum production proportionally to the signal provided by
the humidistat
.
When the humidity in the space falls below the humidistat’s RH set point, the humidistat sends a 0 to 10Vdc
from 7AOUT" terminal to the "IN" terminal on the humidifier controller and in turn, closes the EXT FAN contacts (NO" to C")
in the humidifier controller.
S
Terminal R on the furnace or air handler feeds 24V to the EXT FAN contacts (now closed) and to the blower interlock relay
coil. The interlock relay normally−open contacts close to energize G" on the furnace or air handler and start the indoor blower
(if not already running by a heating demand). The interlock relay also isolates G" from the thermostat to prevent a back feed
that would start the outdoor unit.
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 humidistat has reached its RH set point, its contacts open stopping steam production. The humidifier controller EXT
FAN contacts open, de−energizing the blower interlock coil and stopping the indoor blower (if not running due to a heating
demand or thermostat blower demand). When the indoor blower stops, the air proving switch contacts will open.
C
NO
ON DIP
1 2
3
4
ON
OFF
OFF
ON
HC DIGITAL AUTOMATIC HUMIDISTAT
DIP SWITCH SETTINGS FOR HUMIDISTAT−
ONLY OPERATION
1
2
5G0
6G
7AOUT
8G0
9NTCE
10DIN
Outdoor
Sensor
Outdoor AC Unit
48G96 SPDT Interlock Relay
Thermostat
Typical Air Handler /
Furnace Control
(AHC or IFC)
Alarm
terminals
(if used)
(not
used)
Required Air Proving
Switch (provided)
HC Digital
Automatic
Humidistat
(Cat.. no.
Y3760)
NO
C
NC
C
NO
GND
24VAC
N2
GND
N1
AB
AB
GND
IN
Humidifier
low voltage
wiring panel
Note 1. Blower interlock is required.
Note 2. 48G96 relay field supplied.
Note 3. Remove factory jumper between AB−AB.
Note 4. Connected for ON/OFF configuration.
Figure 18. Humidifier with HC Digital Automatic Humidistat connected for ON/OFF operation
S
When the humidity in the space falls below the humidistat’s RH set point, the circuit closes humidistat terminals 1" and 2"
to complete humidifier controller circuit to IN" and GND" and then closes the humidifier controller EXT FAN contacts ("NO"
to C").
S
Terminal R on the furnace or air handler feeds 24V to the EXT FAN contacts (now closed) and to the blower interlock relay
coil. The interlock relay normally−open contacts close to energize G" on the furnace or air handler and start the indoor blower
(if not already running by a heating demand). The interlock relay also isolates G" from the thermostat to prevent a back feed
that would start the outdoor unit.
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 humidistat has reached its RH set point, output to the humidifier controller "IN" and GND" terminals falls to 0 Vdc,
stopping steam production, then opens the EXT FAN contacts which will stop the indoor blower (if not running due to a heating
demand). When the indoor blower stops, the air proving switch contacts will open.
