McQuay MHC Standard Range User Manual

IM 985-1 / Page 17 of 36
MicroTech III Controller with BACnet MS/TP
Communication Module
For installation and operation information on MicroTech
III unit controller and other ancillary components, see:
• IM 928 - MicroTech III BACnet Communication
Module
• OM 931 - MicroTech III Unit Controller for Water
Source Heat Pumps Operation and Maintenance
Manual
• IM 955 - MicroTech III Wall Sensor For use with
Microtech III Unit Controller
McQuay water source heat pumps are available with
McQuay BACnet communication module The module
is programmed and tested with all the logic required to
control the unit, and is designed to communicate over a
BACnet MS/TP communications network to a building
automationsystem(BAS).Itcanbefactoryoreld-
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 at 76.8 Kbps.
DIP switches on the controller enable the MS/TP
MAC address to be set in the range 0-127.
A status LED on the communication module indi-
cates
communication activity on the MS/TP com-
munication
network.
Figure 14. MicroTech III BACnet Water Source Heat Pump
Snap-in Communication Module
MicroTech III Unit Controller with BACnet
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
An amber, on-board status LED indicates the status of
the MicroTech III BACnet module.
The MicroTech III unit controller includes:
 A
unit-mounted return air sensor
 A
unit-mounted discharge air sensor
 A
leaving water temperature sensor
The communication module provides access to setpoints
for operational control
Available wall sensors include:
 Room
sensor
 Room
sensor with LED status and tenant override
button

Room temperature sensor with LED status, timed-
override button, and ±3°F setpoint adjustment
Room temperature sensor with LED status, timed-
override button, 55° to 90°F setpoint adjustment

McQuay MHC Standard Range Specifications

General

Brand	McQuay
Model	MHC Standard Range
Category	Heat Pump
Language	English