Microtech Iii Controller With An Optional Bacnet® Communication Module - Daikin MicroTech III Installation And Maintenance Manual

MicroTech III Controller with an
Optional BACnet® Communication
Module
For installation and operation information on MicroTech
III unit controller and other ancillary components, see:
• IM 928 - MicroTech III Water Source Heat Pump
BACnet Communication Module
• IM 955 - MicroTech III Wall Sensor For use with
Microtech III Unit Controller
Daikin water source heat pumps are available with
an optional BACnet MS/TP communication module
that is designed to communicate over a BACnet MS/
TP communications network to a building automation
system (BAS). It can be factory or field-installed.
The unit controller is programmed and tested with all the
logic required to monitor and control the unit . An optional
wall sensor may be used with the communication
module to provide limited local control of the water
source heat pump . The unit controller monitors water
and air temperatures and passes information to the
communication module . The module communicates with
the BAS, to provide network control of the water source
heat pump .
The module makes operational data and commands
available on a communications network using BACnet
objects and properties:
• The network cable is a shielded twisted-pair cable
• Network communications run up to 76 .8 Kbps
• DIP switches on the controller enable the MS/TP
MAC address to be set in the range 0-127
• Four green status LEDs on the communication
module indicate communication activity on the
MS/TP communication network and with the unit
controller
Figure 22: MicroTech III BACnet MS/TP Snap-in
Communication Module
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MicroTech III Unit Controller with
BACnet MS/TP Communication
Module orchestrates the following unit
operations:
• Enable heating and cooling to maintain setpoint
based on a room sensor
• Enable fan and compressor operation
• Monitors all equipment protection controls
• Monitors room and discharge air temperatures
• Monitors leaving water temperature
• Relays status of all vital unit functions
The MicroTech III unit controller with
an optional communication module
includes:
• Return Air Temperature sensor (RAT)(field-installed)
• Discharge Air Temperature sensor (DAT)(field-
installed)
• Leaving Water Temperature sensor (LWT)
Note: Refer to IM 956-X for details to install (RAT) &
(DAT) sensors.
When an optional wall-mounted room temperature sensor is
connected to the unit controller, the Return Air Temperature (RAT)
sensor must not be installed . A wall-mounted room temperature
sensor and the return air temperature sensor must not be
connected simultaneously or the unit will not operate properly .
The communication module provides access to setpoints
for operational control
Available wall sensors include:
• Room sensor with LED status and tenant override
button
• Room sensor with LED status, tenant override
button, and ±5°F setpoint adjustment
• Room sensor with LED status, tenant override
button, 55° to 95°F setpoint adjustment
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M t III u C
ICro eCh nIt ontroller
CAUTION
OM 1149-5