4
OM 200MICRO
General Description
General Description
The MicroTech control panel contains a model 280 microprocessor based controller which provides all
monitoring and control functions required for the safe, efficient operation of the chiller. The operator
can monitor all operating conditions by using the panel’s built in 4-line by 40-character keypad /
display or by using an IBM compatible computer running McQuay Monitor software. In addition to
providing all normal operating controls, the MicroTech controller monitors all safety devices on the
unit and will take corrective action if the chiller is operating outside of it’s normal design conditions.
If a fault condition develops, the controller will shut the system down and activate an alarm output.
Important operating conditions at the time an alarm condition occurs are retained in the controller’s
memory to aid in troubleshooting and fault analysis.
The system is protected by a password scheme which only allows access by authorized personnel. A
password must be entered into the panel keypad by the operator before any setpoints may be altered.
Control Panel Layout
Figure 1, Major Component Locations
Terminal
Block
Low Voltage Wireway
Signal
Converter
Signal
Converter
Guardister
Board
Guardister
Board
Low Voltage Wireway
Tr
ans
fo
rm
er
T3
Tr
ans
fo
rm
er
T
4
AOX
Board
EXV
Modem
Low Voltage Wireway
High
Press.
Relay
High
Press.
Relay
MCB 280
Output
Board
ADI
Board
Low
V
ol
tage
Wi
re
w
ay
H
igh
V
ol
tage
Wi
re
w
ay
Te
rm
in
al
B
loc
k
Transformer
Circuit Breaker
