4 KOMAC00607-09EN
Operating Limits:
• Maximum standby ambient temperature, 55°C
• Maximum operating ambient temperature is 46°C, 52°C for Premium Version
• Minimum operating ambient temperature (standard), 2°C
• Minimum operating ambient temperature (with optional low-ambient control), -18°C
• Leaving chilled water temperature, 4°C to 15°C
• Leaving chilled fluid temperatures (with anti-freeze), 3°C to -8°C. Unloading is not
permitted with fluid leaving temperatures below -1°C.
• Operating Delta-T range, 4°C to 8°C
• Maximum operating inlet fluid temperature, 24°C
• Maximum non-operating inlet fluid temperature, 38°C
Controller Features
Readout of the following temperature and pressure readings:
Entering and leaving chilled water temperature
Saturated evaporator refrigerant temperature and pressure
Saturated condenser temperature and pressure
Outside air temperature
Suction line, liquid line, and discharge line temperatures − calculated superheat for discharge
and suction lines
Oil pressure
Automatic control of primary and standby chilled water pumps. The control will start one of the
pumps (based on lowest run-hours) when the unit is enabled to run (not necessarily running on a
call for cooling) and when the water temperature reaches a point of freeze possibility.
Two 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. All events and alarms are time and date-stamped for identification of when the fault
condition occurred. In addition, the operating conditions that existed just prior to an alarm
shutdown can be recalled to aid in isolating the cause of the problem.
Twenty-five previous alarms and related operating conditions are available.
Remote input signals for chilled water reset, demand limiting, and unit enable.
Test mode allows the service technician to manually control the controllers’ outputs and can be
useful for system checkout.
Building Automation System (BAS) communication capability via LonTalk®, Modbus®, or
BACnet® standard protocols for all BAS manufacturers-simplified with McQuay’s Open
Choices™ feature.
Pressure transducers for direct reading of system pressures. Preemptive control of low
evaporator pressure conditions and high discharge temperature and pressure to take corrective
action prior to a fault trip.
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