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Relative Humidity Sensor
(Polarized Male Connector)
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
SPAN
ZERO
C10839
Fig. 66 -- Duct Relative Humidity Sensor Typical Wiring
Humidistat: The accessory humidistat provides the RTU
Open 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
dedicated input on the configurable input 9 and tells the
RTU Open 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
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 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 smoke detector’s tripped status
to the BAS building control. See Figs. 58 and 59, the RTU
Open wiring schematics.
The Fire Shutdown Switch 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 normally open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 57 and Fig. 58 or 59 for wire terminations at J5.
Fan Status: The fan status accessory is a field--installed
accessory. 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
→
Config
→
Inputs
→
input3,5,8,or9to Fan
Status and normally open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 57 and Fig. 58 or 59 for wire terminations at J5.
Remote Occupancy: The remote occupancy accessory is
a field--installed accessory. This accessory overrides the
unoccupied 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 closed
(N/C).
Also set MENU
→
Schedules
→
occupancy source to DI
on/off. Input 8 or 9 is recommended for easy of
installation. Refer to Fig. 57 and Table 9 for wire
terminations at J5.
Power Exhaust (output): The relay used by the RTU
Open board to control power exhaust is a dry contact
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 control 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 logical source. Refer to Fig.
57 and Fig. 58 or 59 for wire terminations at J11.
48HC