Installation
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7
IM 1005-3 • MICROTECH III REMOTE USER INTERFACE
Wiring the Remote User Interface
Wiring the remote user interface to the MicroTech III unit
controller can be done in two different ways:
1. Daisy-chain connection to as many as eight units.
2. Direct connection to a single unit controller.
Connection and wiring instructions in each case are described
in the following section. See
Table 1
for wire sizing and
distance limitations.
NOTE:
Power is supplied by the MicroTech III unit
controller. If a separate 24V power supply
is desired, please contact either the Daikin
Applied Air Technical Response Center at 844-
521-3928 (techresponseaah@daikinapplied.
com) or the Chiller Technical Response Center
at 540-248-9239 (techresponse@daikinapplied.
com).
Table 1: Wiring Specifications
Daisy-Chain Connection
Establish a physical connection from the remote user
interface to the MicroTech III unit controller.
1. Connect a twisted pair wire to the CE + and CE – pins
of each unit controller and remote user interface (see
Figure 4
and
Figure 5
)
.
2. Daisy-chain up to eight MicroTech III unit controllers to
a single remote user interface. See
Figure 5
for wiring
details. Note the wire size and distance limitations
provided in
Table 1.
3. Cycle power to each MicroTech III unit controller once
the wiring of the remote user interface is complete.
NOTE:
Downloading and communication using the daisy-
chain connection may be slower than for the RJ45
(Ethernet) direct connection.
Figure 4: Interface Details for Daisy-Chain Connection
Bus connection
CE+, CE-, not interchangeable
Terminal
2-screw connector
Max. length
1000 ft (305 m)
Cable type
Wiring distance up to 500 ft
Twisted pair, shielded cable 16 AWG
Wiring distance between 500 - 1000 ft
Twisted pair, shielded cable 14 AWG
Wiring distance over 1000 ft
Not currently supported. Contact the appropriate Daikin Applied Technical Response
Center for assistance.
Remote User Interface Interior Bottom View
