4 OM Centrif Micro ΙΙ-5
Features of the Control Panel
• Control of leaving chilled water within a ±0.5°F (±0.3°C) tolerance. Systems with a large water
volume and relatively slow load changes can do better.
• Readout of the following temperature and pressure readings:
• Entering and leaving chilled water temperature
• Entering and leaving condenser water temperature
• Saturated evaporator refrigerant temperature and pressure
• Saturated condenser temperature and pressure
• Suction line, liquid line and discharge line temperatures - calculated superheat for discharge
and suction lines – calculated subcooling for liquid line
• Oil sump temperature - oil feed temperature and pressure
• Optional condenser heat recovery temperature
• Automatic control of primary and standby evaporator and condenser pumps.
• Control of up to 4 stages of cooling tower fans plus modulating bypass valve and/or tower fan
VFD.
• The controller will store and display key historic operating data for recall in a graphic format on
the screen. Data can also be exported for archival purposes via a USB port.
• Three levels of security protection against unauthorized changing of setpoints and other control
parameters.
• Warning and fault diagnostics to inform operators of warning and fault conditions in plain
language. Al1 warnings, problems and faults are time and date stamped so there is no guessing
of when the fault condition occurred. In addition, the operating conditions that existed just prior
to shutdown can be recalled to aid in isolating the cause of the problem.
• Twenty-five latest faults are displayed on the unit controller, eight can be displayed on the touch
screen. Data can be exported for archival purposes via a 3.5-inch floppy drive.
• Soft loading feature reduces electrical consumption and peak demand charges during loop
pulldown.
• Adjustable load pull-down rate reduces under-shoot during loop pulldown.
• Remote input signals for chilled water reset, demand limiting, unit enable.
• Manual control mode allows the service technician to command the unit to different operating
states. Useful for system checkout.
• BAS communication capability via L
ON
M
ARK
, Modbus or BACnet standard protocols for
BAS manufacturers.
• Service Test mode for troubleshooting controller hardware.
• Pressure transducers for direct reading of system pressures. Preemptive control of high motor
amps, low evaporator pressure conditions and high discharge temperature takes corrective action
prior to a fault trip.
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