IM 743-7 • MICROTECH II CHILLER UNIT CONTROLLER 6 www.DaikinApplied.com
Modbus communication module or replace an existing module
on the MicroTech II chiller unit controller.
CAUTION
This equipment contains sensitive electronic components that may be
damaged by electrostatic discharge from your hands. Before you handle
a communication module, you need to touch a grounded object, such as
the metal enclosure, in order to discharge the electrostatic potential from
your body.
WARNING
Electric shock hazard. Can cause personal injury or
.
This equipment must be properly grounded. Only personnel knowledgeable
in the operation of the equipment being controlled must perform connections
and service to the unit controller.
Field Installation Kit
with the following items:
• The Modbus communication module with RS-485 network
connector (attached to module)
• This manual (IM 743)
•
Figure 4
• Needle-nose pliers or similar tool as shown in Figure 5
Follow these steps to install a new communication module on
the unit controller.
1. Remove power from the unit controller.
2. Locate the serial card slot on the unit controller
(Figure 3).
3. Remove the cover if it has not already been removed.
from one end (Figure 4).
Figure 3: Serial Card Slot in Unit Controller
Figure 4: Remove Serial Card Slot Cover
4. Using a needle-nose pliers or similar tool, remove the
pre-cut plastic part of the serial card cover, making the
hole for the network connector (Figure 5 and Figure 6).
Figure 5: Remove Plastic Cover
Figure 6: Serial Card Cover Removed
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. Figure 7 shows
the serial card slot with the 8-pin plug that mates to the
header on the communication module.
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