Related Manuals for McQuay PEH063
Summarization of Contents
OPERATION
OPERATOR RESPONSIBILITIES
Operator responsibilities for safe and efficient chiller operation.
NOMENCLATURE
Identifies components and unit features using unique numbers and labels.
CONTROL SYSTEM
OPERATING CONTROLS
Devices controlling starting, operating, and shutting down the compressor under normal conditions.
PROTECTIVE CONTROLS
SAFETY CONTROL RESET
Procedures for resetting safety controls after abnormal conditions cause a lockout.
CONTROL CENTER
TEMPERATURE SECTION
Contains control module and thermostats with adjustable settings.
RELAY SECTION
Houses operating and safety relays, and wiring terminal strip.
SWITCH SECTION
Includes pressure gauges, indicator lights, and switches on the front panel.
CONTROL MODULE
Solid-state module managing temperature control and current limit.
CAPACITY CONTROL SYSTEM
VANE OPERATION
Hydraulic system using solenoid valves to control inlet vane position for capacity.
METERING VALVES
Adjustable needle valves controlling vane speed for capacity adjustment.
OPERATING THE CHILLER
PRELIMINARY CHECKS BEFORE STARTING
Routine checks to ensure all components are ready for chiller operation.
MAINTENANCE
ROUTINE MAINTENANCE
Regular tasks including lubrication and filter changes.
REFRIGERANT CYCLE
Maintaining operating logs and ensuring proper refrigerant charge.
SEASONAL SERVICING
Procedures for annual shutdown and startup.
REPAIR OF SYSTEM
PUMPING DOWN
Procedure to remove refrigerant from the system while preventing freezing.
PRESSURE TESTING
Testing the system for leaks after repairs are made.
LEAK TESTING
Method to detect refrigerant leaks using pressure and nitrogen.
EVACUATION
Removing air and non-condensables from the system using a vacuum pump.
ADJUSTMENTS
CURRENT LIMIT CALIBRATION
Setting the control module to limit maximum compressor motor current.
TEMPERATURE CALIBRATION
Calibrating the control module to maintain desired chilled water temperature.
RAMP-UP CALIBRATION
Adjusting startup control for compressor loading to suit system requirements.
PULSE RATE CALIBRATION
Setting the rate of corrective action for vane repositioning.
CURRENT TRANSFORMER
Calibration of the signal varying with compressor motor current.
VANE SPEED ADJUSTMENT
Adjusting oil bleed-off rate to control vane opening/closing speed.
TROUBLESHOOTING GUIDE
ALL LIGHTS OUT
Potential causes and solutions when no indicator lights are active.
MOTOR TEMPERATURE
Troubleshooting motor temperature issues indicated by panel lights.
OIL PRESSURE
Diagnosing and resolving issues related to oil pressure.
OIL TEMPERATURE
Addressing problems indicated by oil temperature status lights.
LOW PRESSURE
Troubleshooting issues related to low pressure readings.
DISCHARGE TEMPERATURE
Diagnosing problems related to high discharge temperature.
DISCHARGE PRESSURE
Troubleshooting issues with discharge pressure.
EXTERNAL FAILURE
Identifying external factors causing compressor shutdown or failure.
COMPRESSOR NOT RUNNING
Diagnosing why the compressor fails to start or run.
LOAD RECYCLE
Addressing issues related to the load recycle control function.
SURGEGARD
Troubleshooting surge conditions and Surgegard relay operation.
COMPRESSOR STARTER OVERLOAD TRIPPED
Resolving issues when the compressor starter overload trips.
HUNTING
Diagnosing and correcting compressor hunting or unstable operation.
COMPRESSOR WILL NOT LOAD
Troubleshooting why the compressor fails to load to capacity.
COMPRESSOR WILL NOT UNLOAD
Resolving issues where the compressor fails to unload.
CANNOT RESET CONTROL CIRCUIT
Diagnosing problems preventing the control circuit reset.
Need help?
Do you have a question about the PEH063 and is the answer not in the manual?
Questions and answers