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MOUNTING
HOLES
Io
Vin
Gnd
Vin - J4-1 or J4-4 24Vdc
Io - J4-2 or J4-5 -20mA output
Fig. 79 — Space Relative Humidity Sensor Typical
Wiring
J4-1 or J4-4 + 24 VDC
SUPPLY VOLTAGE
J4-2 or J4-5 (-)4 to 20 mA Current
LOOP OUTPUT TO RTU OPEN
4-20
VAC
GND 0-5V
mA
or
or
VDC
0-10V
Fig. 80 — Duct Relative Humidity Sensor Typical
Wiring
Humidistat
The accessory humidistat provides the RTU
—
Open controller insight to the relative humidity in the space.
The humidistat reads the RH level in the space and compares it
to its setpoint to operate a dry contact. The humidistat is a dedi-
cated input on the configurable input 9 and tells the RTU Open
controller when the RH level is HIGH or LOW. The normal
condition for humidity is LOW. A normally open humidistat is
the factory default control for the Humidi-MiZer System op-
tion.
To wire in the field:
• J5
8 = 24 VAC source for dry contact
—
• J5
7 = Signal input
—
SMOKE DETECTOR/FIRE SHUTDOWN (FSD) — On
48HC units equipped with factory-installed Smoke Detector(s),
the smoke detector controller implements the unit shutdown
through its NC contact set connected to the unit's CTB input.
The FSD function is initiated via the smoke detector's Alarm
NO contact set. The RTU Open controller communicates the
WIRING
OPENING
Vo
SW2
RELATIVE HUMIDITY SENSOR
(POLARIZED MALE CONNECTOR)
SPAN
ZERO
smoke detector's tripped status to the BAS building control.
See Fig. 71 and 72, (RTU Open Controller wiring diagrams).
The Fire Shutdown Switch configuration, MENU
fig
Inputs
input 5, identifies the normally open status of
this input when there is no fire alarm.
CONNECTING DISCRETE INPUTS — Filter Status: The
filter status accessory is a field-installed accessory. This acces-
sory detects plugged filters. When installing this accessory, the
unit must be configured for filter status by setting
MENU
Config
Inputs
and normally open (N/O) or normally closed (N/C). Input 8 or
9 is recommended for ease of installation. Refer to Fig. 70 and
Fig. 71 or 72 for wire terminations at J5.
Fan Status
The fan status accessory is a field-installed ac-
—
cessory. This accessory detects when the indoor fan is blowing
air. When installing this accessory, the unit must be configured
for fan status by setting MENU
5, 8, or 9 to Fan Status and normally open (N/O) or normally
closed (N/C). Input 8 or 9 is recommended for easy of installa-
tion. Refer to Fig. 70 and Fig. 71 or 72 for wire terminations at
J5.
Remote Occupancy
—
field-installed accessory. This accessory overrides the unoccu-
pied mode and puts the unit in occupied mode. When installing
this accessory, the unit must be configured for remote occupan-
cy by setting MENU
Remote Occupancy and normally open (N/O) or normally
closed (N/C).
Also set MENU
Schedules
off. Input 8 or 9 is recommended for ease of installation. Refer
to Fig. 70 and Table 28 for wire terminations at J5.
Power Exhaust (output)
controller board to control power exhaust is a dry contact
which means it does not have 24vac. This 24vac must be con-
nected to the relay to allow it to operate the power exhaust re-
lay in the PE accessory. A 24vac source must be provided to
J11
2 on the RTU Open controller board. This can be provid-
—
ed by the unit's transformer from various sources. The "R" ter-
minal on the unit's central terminal board (CTB) is a logical
source. Refer to Fig. 70 and Fig. 71 or 72 for wire terminations
at J11.
Communication Wiring
GENERAL — Protocols are the communication languages
spoken by control devices. The main purpose of a protocol is to
communicate information in the most efficient method possi-
ble. Different protocols exist to provide different kinds of infor-
mation for different applications. In the BAS application, many
different protocols are used, depending on manufacturer. Proto-
cols do not change the function of a controller; just make the
front end user different.
The RTU Open controller can be set to communicate on
four different protocols: BACnet, Modbus, N2, and LonWorks.
Switch 3 (SW3) on the board is used to set protocol and baud
rate. Switches 1 and 2 (SW1 and SW2) are used to set the
board's network address. See Fig. 81 and 82 for protocol
switch settings and address switches. The third party connec-
tion to the RTU Open controller is through plug J19. See Fig.
83 for wiring.
NOTE: Power must be cycled after changing the SW1
switch settings.
Refer to the RTU Open Controller Integration Guide for
more detailed information on protocols, third party wiring, and
networking.
57
input 3, 5, 8, or 9 to Filter Status
Config
Inputs
The remote occupancy accessory is a
Config
Inputs
input 3, 5, 8, or 9 to
occupancy source to DI on/
The relay used by the RTU Open
—
Protocols
—
Con-
input 3,
3
—
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