Carrier WeatherMaster Series - RTU Open Controller System

54
RTU Open Controller System
The RTU Open controlle r is fac tory--mounted in the 50HC
unit’s ma in c ontrol box (see Fig. 70), 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 PCB 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$er
R
2 package.
The RTU Open controller is an integrated component of
the Carrier 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, Carrier’s i--Vu
R
Open network,
or a Third Party Building Automation System (BAS).
On--board DIP switches allow you to select your protocol
(and ba ud rate) of choice among the four most popular
protocols in use today: BACnet*, Modbus
{
, Johnson N2
and LonWorks**. (See Fig. 69.)
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) Humidimizer
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)
Recommended for all
i-Vu Open installations
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
C14129
Fig. 69 -- RTU Open Multi--Protocol Controller Board
* BACnet is a reg istered trademark of ASHRAE (American Society of
Heating, Refriger ating and Air--- Cond itioning Engineers ).
{
Modbus is a registered trademark of Schneider Electric.
** LonWorks is a registered trademark of Echelon Corporation.