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RTU--MP control system —
The RTU--MP controller, see Fig. 36, 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 551J
unit’s main control box, to the left of the CTB. See
Fig. 37. 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$er2 package.
Refer to Table 2, RTU--MP Controller Inputs and Outputs
for locations of all connections to the RTU--MP board.
C07129
Fig. 36 -- RTU--MP Multi--Protocol Control Board
C10049
Fig. 37 -- 551J Control Box Component Locations
551J
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