Microtech Iii Controller With Bacnet ® Communication; Module - Daikin MicroTech III Operation & Maintenance Manual

MicroTech III Controller with
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
Daikin 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 10: MicroTech III BACnet MS/TP Snap-in
Communication Module
OM 931-6 • MicroTech III Unit Controller for WSHP
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
communication module includes:
■ Return Air Temperature sensor (RAT)(field-installed)
■ Discharge Air Temperature sensor (DAT)(field-
installed)
■ Leaving Water Temperature sensor (LWT) (factory
installed option)
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 ±3°F setpoint adjustment
■ Room sensor with LED status, tenant override
button, 55° to 95°F setpoint adjustment
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