Bryant LEGACY 580J*20M Series, Installation Instructions Manual

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NOTE: The factory default for dehumidification control is
normally open humidistat.
Fig. 53 — Space Relative Humidity Sensor
Typical Wiring
Humidistat — The accessory humidistat provides the RTU
Open insight to the relative humidity in the space. The humidi-
stat 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 Perfect Humidity option.
Fig. 54 — Duct Relative Humidity Sensor
Typical Wiring
To wire in the field:
• J5-8 = 24 VAC source for dry contact
• J5-7 = Signal input
Smoke Detector/Fire Shutdown (FSD) — On 580J 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. 41 and Fig.
42, the RTU Open wiring schematics.
The Fire Shutdown Switch configuration, MENU>Con-
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 accessory detects plugged filters. When
installing this accessory, the unit must be configured for filter sta-
tus by setting MENU>Config>Inputs>input 3, 5, 8, or 9 to Fil-
ter Status and normally open (N/O) or normally closed (N/C). In-
put 8 or 9 is recommended for easy of installation. Refer to Fig.
40-42 for wire terminations at J5.
Fan Status — The fan status accessory is a field-installed acces-
sory. 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>input 3, 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 installation. Re-
fer to Fig. 40-42 for wire terminations at J5.
Remote Occupancy — The remote occupancy accessory is a
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 occupancy
by setting MENU>Config>Inputs>input 3, 5, 8, or 9 to Re-
mote 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. Re-
fer to Fig. 40 and Table 22 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 24 vac. This 24 vac must be connected to the relay
to allow it to operate the power exhaust relay in the PE accesso-
ry. A 24 vac 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. 40-42
for wire terminations at J11.
COMMUNICATION WIRING-PROTOCOLS — Proto-
cols are the communication languages spoken by control devic-
es. The main purpose of a protocol is to communicate informa-
tion in the most efficient method possible. Different protocols
exist to provide different kinds of information for different appli-
cations. In the BAS application, many different protocols are
used, depending on manufacturer. Protocols do not change the
function of a controller; just make the front end user different.
The RTU Open 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. Switch-
es 1 and 2 (SW1 and SW2) are used to set the board’s network
address. See Fig. 55 and 56 for protocol switch settings and ad-
dress switches. The third party connection to the RTU Open is
through plug J19. See Fig. 57 for wiring.
NOTE: Power must be cycled after changing the SW1-3
switch settings.
Refer to the RTU Open v3 Integration Guide for more
detailed information on protocols third party wiring and
networking.
SW2
1 2 3 4 5 6
ON
Io Vin Gnd Vo
MOUNTING
HOLES
WIRING
OPENING
Vin - J4-1 or J4-4 24Vdc
Io - J4-2 or J4-5 -20mA output
SPAN
ZERO
4-20
mA
VAC
or
VDC
GND 0-5V
or
0-10V
1 2 3 4 5 6
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
RELATIVE HUMIDITY SENSOR
(POLARIZED MALE CONNECTOR)