Rtu Open Controller System - Carrier 50HCQ Installation Instructions Manual

RTU Open Controller System

The RTU Open controller is factory−mounted in the
50HCQ unit's main control box (see Fig. 56), to the left
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 Phoenix
connectors on the RTU Open board. The factory−installed
RTU Open controller includes the supply−air temperature
(SAT) sensor. The outdoor air temperature (OAT) sensor is
included in the FIOP/accessory EconoMi$er2 package.
The RTU Open controller is an integrated component of
the Carrier rooftop unit.
programming provides optimum performance and energy
3-Volt
Lithium
Battery
LonWorks
Option Card
Port
J15
Example set for
BACnet MS/TP
and 76.8K baud
(1, 2, and 4 ON)
Recommended for all
Protocol Selector
i-Vu Open installations
Its internal application
Board Power
J4
BO-1 BO-2
J13
J12
J20
*Remove SPT (temp input)
SPT (common)
both for 0-5V
SPT (offset input)
Fig. 55 − RTU Open Multi−Protocol Control Board
efficiency. RTU Open enables the unit to run in 100%
stand−alone control mode, Carrier's i−Vu
or a Third Party Building Automation System (BAS).
On−board DIP switches allow you to select your protocol
(and baud rate) of choice among the four most popular
protocols in use today: BACnet*, Modbus
and LonWorks**. (See Fig. 55.)
Refer to Table 13, RTU Open Controller Inputs and
Outputs for locations of all connections to the RTU Open
board.
NOTE: The RTU Open controller acts as an intelligent
imbedded thermostat. A room thermostat cannot be used
with the RTU Open controller.
J1 J2
BO-3 BO-4 BO-5
J22
AO-2
BO-6
GND
(2-10V)
BO-7
BO-8
J17
Network Comm
J19
BACnet, Modbus, or N2
(LON connection J15)
* 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.
34
R
Open network,
{
, Johnson N2
(AO-1)
0-10VDC
J3
4-20mA
J5 J5
J22
VFD Output
J11
BO-6
(H) Humidimizer
BO-7
(Reversing Valve/High Speed Fan/Y3)
BO-8
(Power Exhaust)
J14
C14129