39
SPAN
ZERO
4-20
mA
VAC
or
VDC
GND 0-5V
or
0-10V
123456
ON
J4-1 or J4-4 + 24 VDC Supply Voltage
J4-2 or J4-5 (-)4 to 20 mA Current Loop Output
to RTU Open controller
Relative Humidity Sensor
(Polarized Male Connector)
C12756
Fig. 67 -- 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 i s a dedicated 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
R
system option.
To wire in the field:
S J5--8 = 24 VAC source for dry contact
S J5--7 = Signal input
Smoke Detector/Fire Shutdown (FSD) —
On 50TC 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 smoke detector’s tripped
status to the BAS building control. See Fig. 59 and 60
(RTU Open Controller wiring schematics).
The Fire Shutdown S witch configuration,
MENU
Config
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 accessory detects plugged
filters. When installing this accessory, the unit must be
configured for filter status by setting
MENU
Config
Inputs
input3,5,8,or9to Filter
Status and normal ly open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig . 58 and Fig. 59 or 60 for wire termination s at J5.
Fan Status: The fan status accessory is a field--installed
accessory. T his accessory detects when the indoor fan i s
blowing air. When installing this accessory, the unit must
be configured for fan status by setting
MENU
Config
Inputs
input3,5,8,or9to Fan
Status and normal ly open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 58 and Fig. 59 or 60 for wire terminations at J5.
Remote Occupancy: The remote occupancy accessory is
a field--installed accessory. This accessory overrides the
unoccupi ed mode and puts the unit in occupied mode.
When installing this accessory, the unit must be
configured for remote occupancy by setting
MENU
Config
Inputs
input3,5,8,or9to Remote
Occupancy and normally open (N/O) or normally cl osed
(N/C).
Also set MENU
Schedules
occu pa n cy s o u r ce to DI
on/off. Input 8 or 9 is recommended for ease of installation.
Refer to Fig. 58 and Fig. 59 for wire terminatio ns at J5.
Power Exhaust (output): The relay used by the RTU
Open controller board to cont rol power exhaust is a dry
conta ct which means it does not have 24vac. This 24vac
must be connected to the relay to allow it to operate the
power exhaust relay in the PE accessory. A 24vac source
must be provided to J11--2 on the RTU Open controller
board. This can be provided by the unit’s transformer from
various sources. The “R” terminal on the unit’s low
voltage terminal board (LVTB) is a logi cal source. Refer
to Fig. 58 and Fig. 59 or 60 for wire terminations at J11.
50TC
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