19
RTU--MP control system
The RTU--MP controller, see Fig. 29, provides expanded
stand--alone operation of the HVAC system plus
connection and control through communication with
several Building Automation Systems (BAS) through
popular third--party network systems. The available
network systems are BACnet MP/TP, Modbus and
Johnson J2. Communication with LonWorks is also
possible by adding an accessory interface card to the
RTU--MP. Selection of the communication protocol and
baud rate are made at on--board DIP switches.
The RTU--MP control is factory--mounted in the
558J***D unit’s main control box, to the left of the CTB.
See Fig. 30. Factory wiring is completed through
harnesses connected to the CTB. Field connections for
RTU--MP sensors will be made at the Phoenix connectors
on the RTU--MP board. The factory--installed RTU--MP
control includes the supply--air temperature (SAT) sensor.
The outdoor air temperature (OAT) sensor is included in
the FIOP/accessory EconoMi$er
t
2 package.
Refer to Table 3, RTU--MP Controller Inputs and Outputs
for locations of all connections to the RTU--MP board.
C07129
Fig. 29 -- RTU--MP Multi--Protocol Control Board
CTB
RTU-MP Board
C08585
Fig. 30 -- 558J***D Control Box Component Locations
558J
***D
