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kingemmaAug 4, 2025
What to do if McQuay PFS 155C Chiller compressor will not load or unload?
- YypayneAug 4, 2025
If the McQuay Chiller compressor will not load or unload, check the solenoids for proper operation and replace them if necessary.
What to do if McQuay PFS 155C Chiller compressor will not load or unload?
If the McQuay Chiller compressor will not load or unload, check the solenoids for proper operation and replace them if necessary.
What to do if McQuay PFS 155C Chiller compressor overload relay tripped or circuit breaker trip or fuses blown?
If the McQuay Chiller compressor overload relay tripped, the circuit breaker tripped, or fuses have blown, check the supply voltage for excessive voltage drop. Also, check and tighten all connections. Verify the supply voltage and check the motor, replacing it if it is defective. Finally, refer to corrective steps for high discharge pressure.
MicroTech control panel with microprocessor, monitoring, and control functions.
Describes the typical operation sequence for McQuay models PFSXXXC screw water chillers.
Explains the alarm light and how it indicates fault conditions on the control panel.
Outlines the sequence and conditions for initiating chiller operation.
Details the process and conditions for stopping chiller operation.
Step-by-step guide for checks and preparations before unit startup.
Procedures for initiating the chiller's operational sequence.
Procedures for brief interruptions in chiller operation.
Procedures for longer periods of inactivity.
General checks for sightglasses, pressures, and refrigerant status.
Information about the chiller's lubrication system.
Details on maintaining the compressor, including vibration checks.
Instructions for checking and tightening electrical terminals.
Guidance on observing and interpreting refrigerant sightglasses.
Explanation of how compressors alternate lead-lag operation.
Function and pre-start requirements for crankcase heaters.
Describes the solenoids controlling compressor capacity and their status.
Guidelines for changing filter-dryers based on pressure drop or moisture.
Procedures for pumping down the unit before servicing.
Details on the function and maintenance of the electronic expansion valve.
Recommendations for charging refrigerant, sensitivity to under/overcharging.
Covers Liquid Presence Sensor, High Condenser Pressure Control, Mechanical High Pressure Safety Control, Compressor Motor Protection.
Protection against electrical issues like phase loss or reversal.
Overview of the MicroTech control panel, its functions, and features.
Diagram showing the major component locations on the control panel.
Description of the MCB1, its role in monitoring and control.
Explains the function of the status LEDs on the model 280 controller.
Description of the Digital Output Board and ADI Board.
Description of AOX Board and Signal Converter Board.
Covers Guardistor Board monitoring and Power Transformers.
Explains how to navigate and use the keypad and display.
Describes keys for Status, Control, Alarm, Switch functions.
Details on navigating menus and changing setpoints.
Covers password entry, quick access, and display format.
Displays current operating conditions and status of the unit.
Shows status, amps, hours, and temperatures for Compressor 1.
Shows status, amps, hours, and temperatures for Compressor 2.
Displays water temperatures and flow rates for evaporator and condenser.
Shows refrigerant temperatures and pressures for system monitoring.
Displays current status of cooling tower operation.
Allows selection of operational modes like Manual Off, Automatic, Manual Enable, Service Testing.
Configuration of leaving evaporator setpoint sources and reset options.
Settings for demand limiting, signal inputs, and soft loading.
Allows setting the current time and date for the system.
Configuration of daily schedules, overrides, and network schedules.
Entry of holiday dates to modify the operating schedule.
Configuration of various timers like Start-Start, Evap Recirc, Stop-Start.
Settings for cooling tower control, stages, and differentials.
Configuration of cooling tower valve control, setpoints, and limits.
Configuration of alarm setpoints for pressure and temperature.
Options for EXV, timers, hot gas bypass, and pumpdown settings.
Displays current alarms for Compressor 1.
Displays current alarms for Compressor 2.
Logs historical alarm data for Compressor 1.
Logs historical alarm data for Compressor 2.
Displays system messages.
Lists causes and corrective steps for compressor issues.
Lists causes and corrective steps for pressure-related issues.
Maintenance schedule for the compressor, including performance, motor, and lubrication.
Maintenance schedule for operating and protective controls.
Maintenance schedule for the water-cooled condenser.
Maintenance schedule for the evaporator.
Maintenance schedule for expansion valves.
Maintenance for the compressor-chiller unit, including leak tests.
Maintenance schedule for starters, including contactors and connections.
Maintenance schedule for optional controls.
General
