General Description; Component Data - McQuay MicroTech II Installation And Maintenance Manual

General Description

The MicroTech II Unit Controller is a microprocessor-based
controller designed to provide sophisticated control of
McQuay Vertical Self-Contained units. In addition to
providing normal temperature, static pressure, and
ventilation control, the controller can provide alarm
monitoring and alarm-specific component shutdown if
critical system conditions occur.
The operator can access temperatures, pressures, operating
states, alarm messages, control parameters, and schedules
with an 8-key keypad and a 4-line by 20-character display.
The controller includes password protection against
unauthorized or accidental control parameter changes.
This MicroTech II controller is capable of complete,
stand-alone unit control or it can be incorporated into a
building-wide network using an optional plug-in
communication module. Available communication modules
Figure 1:Typical MicroTech II main control panel layout
Adjustable Frequency
Drive (Optional)
* Unit controller is L
2
LonWorks Communication Module*
BACnet Communication Module
Duct Static Pressure Sensor
Transformer, Main Control, 115V, T1
®
M certified with the L
ON ARK
include BACnet Ethernet, BACnet MSTP, LonMark Space
Comfort Controller (SCC) and LonMark Discharge Air
Controller (DAC).

Component Data

The main components of the MicroTech II control system
include the main control board (MCB), either one or two
optional auxiliary cooling control boards (CCB1 and CCB2),
and a keypad/display. The MCB, CCB1 and CCB2 are
always located in the main control panel as shown in
Figure 1. These components are interconnected by shielded
multi-conductor communication cables, or in the case of the
keypad/display by a six conductor cable with an RJ-11 style
modular connector. Transformers T1, T2, and T3 supply
power to the system. The following are descriptions of these
components and their input and output devices.
Phase Voltage
Monitor
Transformer, Control Output, 24V, T3
Transformer, Control Output, 24V, T2
®
W communication module.
ON ORKS
Disconnect Switch
(Optional)
Power Block
McQuay IM 710-1