Automation Components ACI/RH Duct ACI and Outside Series - Manual

2305 Pleasant View Rd. Middleton Industrial Park Middleton, WI 53562
PH: (608) 831-2585 FAX (608) 831-7407
I0000145.DOC Rev 3
Installation and Operation Instructions
ACI/RH Duct and Outside Series
ACI
Automation Components, Inc.
Please Read Instruction Carefully Before Installation!
The ACI/RH Duct and Outside series transmitters are a universal Relative Humidity transmitter that can be powered with
either a +15 to 36 VDC or 24 VAC supply voltage. The ACI/RH uses a half-wave bridge rectifier to convert the AC
power to a useable DC voltage. Caution: When using a 24 VAC transformer, ACI recommends that you use an
isolated transformer. If sharing the transformer with your controller, valve, actuator, or any other device, be sure to
connect all of the devices with the proper polarity, since most controllers are earth grounded. Failure to do so may
result in damage to the ACI/RH, your controller, or any other devices that are attached due to a ground loop problem.
The ACI/RH Duct and Outside transmitters are designed with a field selectable 4-20 mA, 0-5 VDC, or 0-10 VDC output
signal that is equivalent to 0 to 100% RH. Unless specified upon ordering, all units are shipped from the factory to
accept DC power with a 2-wire, 4-20 mA loop-powered output. Caution: When changing the Output Selection Switch
(SW3) make sure that the power supply is turned off before making any changes. Failure to do this may cause
damage to the unit.
RH Duct and Outside Wiring Diagram (ACI Standard in Euro Housing)
ACI recommends that the ACI/RH 4-20 mA Duct and Outside relative humidity transmitters be wired with a two-wire,
16-22 AWG twisted pair or shielded cable for best results. All ACI/RH Duct and Outside voltage output or AC powered
current output transmitters should be used with a 3-wire, 16-22 AWG shielded cable. Note: When using a shielded
cable, be sure to connect only (1) end of the shield to ground at the controller. Connecting both ends of the shield to
ground may cause a ground loop.
1 2 3 4
ON
4 5 6 3 2
ON
1
SW2
SW3
J2
4-20 VAC GND 0-5V
mA or or
VDC 0-10V
Relative Humidity Sensor
(Polarized Male Connector See Figure #8 above)
Span Adjust
Potentiometer
Zero Adjust
Potentiometer
Red
Wire
BLK
Wire
Green
Wire
DC Power
AC Power
2
2
Figure # 2
Output Selection Switches (SW3)
4-20mA Out
4-20mA Out
3
4
4
3
AC/DC Power
AC/DC Power
0-10 VDC
0-5 VDC Out
ON
1
ON
1
4
4
3
3
ON
2
2
1
1
ON
Test and Calibration Switch Settings (SW2)
100% RH Output
50% RH Output
0% RH Output
Figure # 3
6
6
6
5 4
5
5
4
4
Normal Operating Condition
Reset to Original Calibration
Decrement RH Output
Increment RH Output
ON
ON
ON
3 2
3
3
2
2
6
1
5
1
1
4 3 2 1
ON
4
4
4
5 6
5
5
6
6
3 2
3
3
2
2
ON
1
ON
1
1
ON
Figure # 1
J3
For ACI programming use only !
Figure # 8
J2
Push tab in and pull up on the Sensor
cable to remove from J2 Connector
R
ed
B
lack
G
reen