29
RTU OPEN CONTROL SYSTEM
The RTU Open controller is an integrated component of the
Bryant rooftop unit. Its internal application programming
provides optimum performance and energy efficiency. RTU
Open enables the unit to run in 100% stand-alone control mode
or a Third Party Building Automation System (BAS). On-
board DIP switches allow the user to select your protocol (and
baud rate) of choice among the four most popular protocols in
use today: BACnet, Modbus
1
, Johnson N2 and LonWorks
2
.
See Fig. 51.
The RTU Open control is factory-mounted in the unit’s main
control box, to the left of the UCB (unit control board). Factory
wiring is completed through harnesses connected to the UCB.
Field connections for RTU Open sensors will be made at the
PCB connectors on the RTU Open board. The factory-installed
RTU Open control includes the supply-air temperature (SAT)
sensor. The outdoor air temperature (OAT) sensor is included
in the FIOP/accessory EconoMi$er
®
2 package.
Sensory/Accessory Installation
There are a variety of sensors and accessories available for the
RTU Open. Some of these can be factory or field installed, while
others are only field installable. The RTU Open controller may
also require connection to a building network system or building
zoning system. All field control wiring that connects to the RTU
Open must be routed through the raceway built into the corner
post of the unit or secured to the unit control box with electrical
conduit. The unit raceway provides the UL required clearance be
-
tween high and low-voltage wiring. Pass the control wires through
the hole provided in the corner post, then feed the wires thorough
the raceway to the RTU Open. Connect the wires to the removable
PCB connectors and then reconnect the connectors to the board.
Fig. 51 — RTU Open Control Module
1. LonWorks is a registered trademark of Echelon Corporation.
2. Modbus is a registered trademark of Schneider Electric.
IMPORTANT: Refer to the specific sensor or accessory
instructions for its proper installation and for rooftop unit
installation refer to base unit installation instructions and the
unit’s wiring diagrams.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, death and/or equipment damage.
Disconnect and lockout/tag-out electrical power before
wiring the RTU Open controller.
J4
J2
J1
J5
J5
J22
J17
J19
J14
J11
J22
J3
J13
J12
J15
J20
Network Comm
Configurable - Input_8
24 V
AC
Configurable - Input_5
24 V
AC
Configurable - Input_3
24 V
AC
Input_9 (Humidistat)
24 V
AC
24 V
AC
Input _8 (Enthalpy)
AO-1 (ECON)
Gnd
(OA
T)
Gnd
(SA
T)
Input_5 (SMK)
Input_4
(R)
BO-5
(Y1)
BO-4
(Y2)
BO-3
(W1)
BO-2
(W2)
BO-1
(G)
Gnd
Input_3
(X)
24 V
AC IN
+24 VDC
Input_2 (CO2/RH)
Gnd
+24 VDC
Input_1 (CO2/RH)
Gnd
Board Power
(AO-1)
0-10VDC
4-20mA
BO-6
(H) Dehumidification
BO-8
(Power Exhaust)
LonWorks
Option Card
Port
Example set for
BACnet MS/TP
and 76.8K baud
(1, 2, and 4 ON)
Protocol Selector
SPT (temp input)
BACnet, Modbus, or N2
(LON connection J15)
SPT (common)
SPT (offset input)
*Remove
both for 0-5V
AO-2
GND
(0-10V or 2-10V)
BO-7
(Reversing Valve/High Speed Fan/Y3)
3-Volt
Lithium
Battery
BO-1
BO-2
BO-3
BO-4
BO-5
BO-6
BO-7
BO-8
VFD Output/IDF Output
Содержание 547K
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