Bryant 549J Series User Manual

39
RTU Open Controller System
The RTU Open controller is factory--mounted in the 549J
unit’s main control box (see Fig. 44), to t he l eft of the
CTB. Factory wiring is completed through harnesses
connected to the CTB. Field connections for RTU Open
controller sensors will be made at the PCB connectors on
the RTU Open controller board. The fa ctory--installed
RTU Open controller includes the supply--air temperature
(SAT) sensor. The out door air temperature (OAT) sensor is
included in the FIOP/acce ssory EconoMi$er2 package.
The RTU Open controller is an integrated component of the
Bryan t roof top unit. Its intern al application progr amming
prov id es optimum perfo r mance and ener g y eff icien cy. The
RTU Open controller enables the unit to run in 100%
stand--alone control mode, or a Third Party Building
Auto matio n Sys tem (BAS). On--boar d DIP s w itches allow
you to select your protocol (and baud rate) of choice among
the four most popular protocols in use today: BACnet*,
Modbus
{
, Johnson N2 and LonWorks**. (See Fig. 43.)
Refer to Table 23, RTU Open Controller Inputs and
Outputs for locations of all connections to the RTU Open
controller board.
NOTE: The RTU Open controller acts as an intelligent
imbedded thermostat. A room thermostat cannot be used
with the RTU Open controller.
J4
J2J1
J5 J5
J22
J17
J19
J14
J11
J22
J3
J13
J12
J15
J20
Network Comm
Configurable - Input_8
24 VAC
Configurable - Input_5
24 VAC
Configurable - Input_3
24 VAC
Input_9 (Humidistat)
24 VAC
24 VAC
Input _8 (Enthalpy)
AO-1 (ECON)
Gnd
(OAT)
Gnd
(SAT)
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 VAC 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-7
(Reversing Valve/High Speed Fan/Y3)
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
(2-10V)
3-Volt
Lithium
Battery
BO-1 BO-2 BO-3 BO-4 BO-5
BO-6
BO-7
BO-8
VFD Output
C14162
Fig. 43 -- RTU Open Controller Multi--Protocol Control Board
* BACnet is a registered trademark of ASHRAE (American Society of
Heating, Refrigerating and Air--- Conditioning Engineers) .
{
Modbus is a registered trademark of Schneider Electric.
** LonWorks is a registered trademark of Echelon Corporation.

Bryant 549J Series Specifications

General

Brand	Bryant
Model	549J Series
Category	Heat Pump
Language	English