Carrier 48LC Series - RTU Open Control System

31
RTU Open Control System
The RTU Open control is factory--mounted in the 48LC
unit’s main control box, to the left of the CTB. See
Fig. 50. Factory wiring is completed through harnesses
connected to the CTB. Field connections for RTU Open
sensors will be made at the Phoenix 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$er2 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 Open network, 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, Johnson N2 and LonWorks. (See Fig. 49.)
Refer to Table 4, RTU Open Controller Inputs and Outputs
for locations of all connections to the RTU Open board.
J4
J2J1
J5 J5
J22
J17
J19
J14
J11
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) DO-5 (Y1) DO-4 (Y2) DO-3 (W1) DO-2 (W2) DO-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
DO-6
(H) Humidimizer
DO-7
(Reversing Valve/High Speed Fan)
DO-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
C12751
Fig. 49 -- RTU Open Multi--Protocol Control Board
C12152
Fig. 50 -- 48LC Control Box Component Locations with RTU Open
48HC48LC