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

7. If needed, activate dip switches S1, S2, and S3 (current
hardware) as shown in
and P3 jumpers (previous hardware) as shown in
11. This step is only required if it is the first or last unit on
the network. Do not activate switches or insert jumpers
on intermediate units.
Figure 10: Dip Switch Positions (Current Hardware)
Figure 11: Jumper Connections (Previous Hardware)
8. Insert the plug-in connector to the communication
module.
9. Mount the plastic cover (provided in the field kit) on
the serial card slot. Slip the cover over the network
connector plug (Figure
Figure 12: BACnet MS/TP Communication Module with
Cover (Current Hardware)
IM 906-4 • MICROTECH II CHILLER UNIT CONTROLLER
Figure 10, or install the P1, P2,
Figure
12).
10. Connect the communication module to the network
(Figure 14 and Figure
a. Route the network cable through the knockout and
to the communication module.
b. Connect the positive (+) wire of the network cable
to Pin 2 of the connector plug.
c. Connect the negative (-) wire to Pin 3 of the
connector plug. Note that no wire is connected to
Pin 1 (GND).
12. (Optional) Install the ferrite-lined plastic enclosure on the
network cable for noise reduction
Figure 13: Ferrite Enclosure

Replacing a Communication Module

Follow these steps to remove an existing communication
module from unit controller and replace it with a new one.
1. Remove power from the unit controller.
2. Locate the serial card slot on the unit controller
(Figure 6).
3. Pull the network cable connector from the
communication module.
4. Remove the existing cover from the serial card slot. Use
a small screwdriver to carefully pry it off from one end
(Figure 7).
5. Grasp the communication module, with the network
connector on the underside. The 8-pin header must
mate to the 8-pin plug in the unit controller. The plug has
a guide on each end to direct it into the mating guide
on the communication module header.
the serial card slot with the 8-pin plug that mates to the
header on the communication module.
NOTE: This operation relies more on fitting the
communication module into the connector than
seeing the connectors mate.
6. Insert the communication module, pointed up, into the
slot. Keeping it level, roll the module into position as you
guide it into the slot, feeling the connectors line up.
7. When you feel the connectors align, press the
communication module into the connector. Verify that the
communication module is firmly connected.
8. If needed, activate dip switches S1, S2, and S3 (current
hardware) as shown in Figure 10, or install the P1, P2,
and P3 jumpers (previous hardware) as shown in
11. This step is only required if it is the first or last unit
on the network. Do not activate switches or insert the
jumpers on intermediate units.
10
Installation
15):
(Figure 13).
Figure 8 shows
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Figure