Tesco Major HFC Refrigeration Pack PPM

Title Page

Maintenance Tasks

The purpose of this document is to guide you through all tasks to be completed on a Major PPM on Tesco Larger Stores (All Stores with the exception of Express Stores) and to document all PPM's that we complete on our clients sites.

Details

Confirm Asset Tag is In Place and Not Damaged
Confirm Correct Warning Labels are Displayed on Control Panel Door
Confirm Mains Incoming Isolator Terminal Shields are in Place
Confirm Panel Wiring and Components Have No Signs of Over Heating Damage
Confirm Pack Has no Liquid Flood Back
Confirm Oil Level is Achieved in All Compressors & Oil Separators
Confirm Liquid Reciever is Free From Corrosion & Damage
Confirm All PRV's are Connected To Vent Lines
Confirm There is a Visible Level in The Bottom Indicator of the Liquid Line Sight Glass

Confirm Isolator Engineer Interlock is Functioning Correctly. **This Allows Access to Control**
Using an Infrared Thermometer, Record Mains Terminal Temperatures **Should Not Exceed 40°c**
Confirm All Ventilation Panel Fans are Working and Filters are Clear of Debris
Confirm All Overloads and Trips are Operational
Confirm All Compressors Run When Required by Pack Controller
Check All Compressor Run Currents From The Overload
Confirm Against Compressor Data Plates That All Overloads Are Set No Higher Than 10% Above The Full Load Amps
Confirm All Crankcase Heaters are Operational

Confirm Operation of Housing Extract Fan, Isolate and Clean Using A Soft Brush
Confirm All Compressor Mounts and Fixings Are Present and Secure
Rota Lock Torque Chart
Confirm All Compressor Rota Lock Valves are Tightened To Correct Torque Setting
Confirm Compressor Vapour/Liquid Injection is Operational with Compressor Running (LT ONLY)
Visually Inspect Oil in Compressors and Oil Separators/Reservoir Sight Glasses for Any Signs of Burnout or Acidity.
Confirm Oil Separator for Excessive Pressure Drop Across the Internal Filter. **If Pressure Drop is More Than 20PSI Filter Requires To Be Replaced**
Test All Override and Safety Switches, Confirm Safety Switches Operate at The Correct Pressure. **Label Switches With Test Date and Set Pressure**
Trip Main Pack Controller to Confirm the Plant Runs in Backup Mode, Reset The Main Controller After Task. **Label Back up controller with High Suction Set Point and Time**
Confirm With Service Gauges That Pressure Transducers are Reading Correctly for the Main Pack Controller and Backup Controller
Replace Liquid Line Drier Core. **Label Plant or Drier Housing With Date of Replacement**
Leak Test All Refrigeration Pipework & Components

Test For Non Condensable in Condenser
Confirm All Condenser Fan Fixings, Blades and Fan Guards are In Place and Secure
Confirm That The Rotation of Condenser Fans and The Operation of The Controllers is Correct
Brush Off Debris from Underneath the Condenser Prior to Jet Washing. Lock Off and Tag off Each Fan When Jet Washing the Condenser.
Remove One Fan At A Time and Jet Wash Condenser Down Through From Above, Ensure Water is running Clear When Completed. **upload Photo of Condenser After Clean**
Confirm Condenser Fins Are Clear From Any Damage Or Corrosion. If Fines are Damaged, Straighten Using Correct Size Fin Comb

Ensure Electrical Panel and Interior of Pack Housing is Clean and Free From Debris
Ensure Electrical Panel Door Fully Closes and Locks are Engaged
Ensure All Drawings are Left in Designated Folder
Leave Work Area In a Clean & Tidy Condition
Close and Lock Plant Doors, Ensuring Canopy Locks are in Place

Confirm on Alarm Panel All Cases are Running to Set Point & Communicating
Confirm Battery Status, Replace if Required
Confirm All Alarms are Clear and Healthy On Ims. **Area Desk Engineer Will Confirm**