McQuay MicroTech Unit Controller Installation And Maintenance Data page 4

Oil Pump
Contactor \
Field
Connection
Terminal
Strip
The control panel contains the following components:
minals for pre-assigned logic control functions.
See the Control Legend or the wiring schematic for specific
terminal identification.
data includes water and refrigerant temperatures, motor
amperage, oil pressure and oil temperature.
0 Digital contact closures prove the existence or operation
of ancillary functions required for the safe operation of the
controlled chiller.
(For a complete list of inputs, see the table provided or the
wiring schematic).
aluminum encased logic and power (l/O) cartridges secure-
ly clamped to the controller mother board.
analog input signals, and deliver the needed voltage levels
to the microprocessor.
IM 403
I
Page 4
TR-3 (Top) -
TR-2
Transformers
Output Relays
and Mounting Board
Power Cartridge (Input/Output)
I Mother Board
display EnGinn.
relays and capacitors.
l Mechanical/Electrical low pressure (MLP) and high
pressure (MHP) refrigerant protective controls.
Oil pump contactor with auxiliary interlocks
l
mounted on the cover panel.
status of the microprocessor control and compressor
Guardistor
Relays
High Press. (Left)
and Low Press.
EnGinn
to DC volts
Signal Converter