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 provid-
ing normal temperature, static pressure, and ventilation con-
trol, 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 unau-
thorized 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 include BACnet
Figure 1: Typical MicroTech II Main Control Panel Layout
IM710
Ethernet, BACnet MSTP, LonMark Space Comfort Control-
ler (SCC) and LonMark Discharge Air Controller (DAC).

Component Data

The main components of the MicroTech II control system
include the main control board (MCB), and 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.
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