ACI-Automation Components RH Duct, Outside Series Instruction Sheet

GENERAL INFORMATION

The RH Duct and Outside transmitter is a Relative
Humidity transmitter that can be powered with either an
AC or DC supply voltage. The transmitter can also
include an optional temperature sensor for monitoring
the space temperature.

All units are shipped from the factory set up with a 4-20
mA output. The RH Duct and Outside transmitter is
field selectable with a 4-20 mA, 0-5 VDC, or 0-10 VDC
output signal that is equivalent to 0 to 100% RH.

Factory Use Only

Wire Connections

Incorrect

Installation and Operation Instructions

RH Duct and Outside Series

PLEASE READ INSTRUCTIONS CAREFULLY BEFORE INSTALLATION!

MOUNTING INSTRUCTIONS

IMPORTANT: RH Remote Probes and some
Outside units include a Black Rubber Cap that fits
over the sensor filter. The Cap should be placed on
the sensor filter during wet/wash down processes.
The Cap must be removed for normal operation.

Duct Mounting Configuration
Drill a ¾” diameter hole in the duct where the
transmitter is to be mounted. Insert the stainless-steel
probe into the hole until the foam is in direct contact

Push tab in and pull up on the sensor
cable to remove from J13 connector

ON

1342765 8

Figure #1

Figure #2

Factory Use Only

Correct

with the duct. Attach the transmitter to the duct using
the supplied #8 X ¾” self-tapping screws.

Remove the cover and install your conduit connector or
watertight fitting. The outer knockout ring should not be
removed when using a ½” NPT conduit fitting.

After wiring the unit, place the cover back on and gently
turn until it is tight.

Outdoor Mounting Configuration
The transmitter should be mounted under an eave,
shield, or in an area out of the elements or direct
sunlight. The aluminum tube should point down when
mounting the outside transmitter. Refer to Figure #2 for
the proper mounting position.

Place the unit where it is to be mounted with the cover
facing out. Attach the unit with the supplied #8 X ¾”
self-tapping screws.

Remove the cover and install the PG11 watertight fitting
supplied with the unit. The outer knockout ring should
not be removed when using a ½” NPT conduit fitting.

After wiring the unit, place the cover back on and gently
turn until it is tight.

Page 1 of 4 I0000546

Version : 5.0

WIRING INSTRUCTIONS

16 to 22 AWG shielded cable is recommended for all
RH Transmitters. Twisted pair may be used for 2-wire
current output transmitters. If using 24 VAC power,
two separate wires must be pulled for the transmitter to
work properly; one 16 to 22 AWG shielded cable for the
supply voltage, and a second 16 to 22 AWG shielded
cable for the selected output(s). Signal wiring must be
run separate from high voltage wires (120-Volt). The
connections to the optional temperature sensor should
be made with wire nuts or crimp style connectors. Refer
to Figure #3 for wiring diagram.

Caution:

 It is recommended that you use an isolated

UL-listed Class 2 transformer when
powering the unit with 24 VAC. Failure to
wire the devices with the correct polarity
when sharing transformers may result in
damage to any device powered by the
shared transformer.

 Remove power before wiring. Never connect

or disconnect wiring with power applied.

 When using shielded cable, ground the

shield only at the controller end. Grounding
both ends can cause a ground loop.

Figure #3

Version : 5.0

Page 2 of 4 I0000546

OUTPUT SELECTIONS

Switches 6, 7, and 8 are used to set the RH output
signal. Refer to Figure #4 for switch settings.

Output Selection Switches (SW1)

4-20 mA Output

ON

ON

2 3

1

OFF

ON

OFF

ON

ON

4 8

5 6 7

0-10 VDC Output

2

3

4

6 81

5ON7

0-5 VDC Output

OFF

1 4 5 6

2 3

7 8

Figure #4

REVERSE ACTING OUTPUT

The output can be changed to reverse acting mode. The
output range stays the same but the corresponding RH
value is opposite.

Example: Direct Acting (DA)

0-10V output mode,

0V = 0% RH and 10V = 100% RH
Reverse Acting (RA)
0-10V output mode,
0V = 100% and 10V = 0%

To change the transmitter to reverse acting or back to
direct acting, set switch 4 ON to put the unit in setup
mode. After switch 4 is on, switch 2 will put the unit in
direct/reverse acting mode. When switch 2 is set to ON,
the output can be used to show if the unit is in direct or
reverse acting mode. For direct acting, the output will
be 1V for 0-5V, 2V for 0-10V, and 7.2mA for 4-20mA.
For reverse acting the output will be 4V for 0-5V, 8V
for 0-10V, and 16.8mA for 4-20mA.

With switches 2 and 4 ON, each time switch 5 is set to
ON the output will change to reverse acting or direct
acting.

To reset the unit to the default setting, toggle both
switches 5 and 6 ON then OFF while both switches 2
and 4 are ON.

When all calibration is completed, remember to place
the switches back into the positions that correspond to
the output needed as shown in Figure #4.