Replacing A Communication Module - Daikin MicroTech III Installation And Maintenance Manual

5. Insert the board-to-board connector into the Modbus
communication module. Note that it only fits one way
and that the baffles must line up with corresponding slots
in the communication module and the unit controller
(Figure 7 and Figure 8).
Figure 8: Communication Module with Board-to-Board
Connector Inserted
6. Insert the other end of the board-to-board connector to
the far-left side of the unit controller or other module, if
attached.
7. Insert the network cable into the Modbus communication
module's top network connector, Channel 0
8. Apply power to the unit controller.
NOTE: The unit controller automatically resets itself
approximately 30 seconds after power has been
applied to it. This reset is necessary so that the
Modbus communication module can synchronize with
the unit controller.
9. Set the Unit On/Off Switch to "On" from inside the control
panel of the unit.

Replacing a Communication Module

Follow these steps to remove an existing Modbus
communication module from the unit controller and replace it
with a new module.
1. Disable the chiller by setting the Unit On/Off Switch to
"Off" from inside the control panel of the unit. This must
be done prior to replacing a communication module. See
Figure 6 for switch location.
2. Remove power from the unit controller.
3. Locate the Modbus communication module to the left of
the unit controller (Figure
4. Gently pull the network cable connector from the Modbus
communication module
5. Grasp the Modbus communication module and carefully
pull it from the unit controller (or from an adjacent
module, if it is attached to one).
6. Install the new Modbus communication module:
IM 969-5 • MICROTECH III CHILLER UNIT CONTROLLER
(Figure
3).
(Figure 4).
NOTE: To prevent damage to the unit controller, insert a
small flathead screwdriver or similar tool into the
tab on the bottom of the unit controller and pull the
screwdriver away from the controller.
a. Carefully remove the blue plastic knockout strip
on the right side of the Modbus communication
module.
b. Insert the board-to-board connector into the
Modbus communication module. Note that it only
fits one way and that the baffles must line up with
corresponding slots in Modbus communication
module and the unit controller
Figure
7. Insert network cable into the Modbus communication
module's top network connector, Channel 0
8. Apply power to the unit controller.
NOTE: The unit controller automatically resets itself
approximately 30 seconds after power has been
applied to it. This reset is necessary so that the
Modbus communication module can synchronize with
the unit controller.
9. Set the Unit On/Off Switch to "On" from inside the control
panel of the unit.
4).
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(Figure 7
8).
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(Figure 4).