When a commercial chiller fails mid-summer, the cost isn't just the repair bill — it's halted production, occupant discomfort, emergency technician rates, and refrigerant recovery fees that pile up fast. Facilities that follow a structured, frequency-based maintenance program consistently report 30–45% fewer unplanned outages and equipment that lasts 5–8 years longer than industry averages. Whether your plant runs centrifugal, screw, or scroll chillers, the checklists below give every technician and facility manager the exact tasks needed — every day, every week, every year — to keep chiller systems running at peak efficiency.
A 0.001-inch scale layer on condenser tubes cuts heat transfer efficiency by 10% and adds 6–8% to your energy bill every month it goes untreated.
Missed oil analysis leads to compressor bearing failures averaging $45,000–$90,000 to repair — 900x the cost of a $50 lab test every six months.
Without weekly leak checks, small refrigerant losses go unnoticed until system efficiency drops 20–30% — far beyond what routine monitoring would catch in days.
Daily Operating Log Checklist
Record every parameter at the start and end of each operating shift. Flag any reading that deviates more than 10% from your established baseline. Teams using OxMaint — sign up now capture these readings digitally with auto-alert thresholds built in.
Weekly Visual and Mechanical Inspection
A focused 25–35 minute walkdown that catches developing issues before they become costly work orders. Assign this task weekly in your CMMS — book a demo to see how OxMaint automates scheduling.
Monthly Preventive Maintenance Checklist
Core PM tasks that protect compressor longevity, maintain efficiency, and satisfy most OEM warranty requirements. Sign up for OxMaint to auto-generate these work orders with technician assignments every 30 days.
Centrifugal Chiller PM Checklist
Covers surge, impeller health, and oil system tasks unique to centrifugal compressor units.
Screw and Scroll Chiller PM Checklist
Rotary compressor systems common from 20 to 500 tons require targeted checks not covered in general PM tasks.
Chiller Tube Cleaning and Water-Side Inspection Checklist
Scale and biofilm are silent efficiency killers. A 0.001-inch deposit reduces heat transfer by 10%. Most facilities that track tube condition through OxMaint catch fouling 3x earlier — create your free account today and prevent the worst costs.
Annual Comprehensive Chiller Inspection Checklist
Full-scope shutdown inspection performed during low-demand periods. Schedule, assign, and document every step digitally — book a demo to see OxMaint's annual PM workflow live.
Ditch Paper Logs. Run Smarter PM Programs.
OxMaint digitizes every checklist above — auto-assigns tasks, captures readings with pass/fail limits, flags anomalies instantly, and produces compliance-ready audit reports without any manual effort.
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Key Operating Parameters to Track Daily
These six benchmarks separate well-maintained chillers from ones heading toward failure. Tracking them manually is error-prone — sign up for OxMaint to configure automatic alerts the moment any parameter drifts outside its target range.
Below 8 degrees indicates low flow or evaporator fouling. Above 12 degrees may signal oversized load or underperforming plant.
Rising approach temperature is the first reliable sign of condenser tube fouling or inadequate condenser water flow rate.
Low differential oil pressure on centrifugal and screw compressors triggers safety shutdown to prevent catastrophic bearing failure.
Well-maintained centrifugal at full design load. Above 0.8 kW/ton warrants immediate investigation of fouling or refrigerant charge.
Measured at suction inlet. High superheat points to restricted metering device or low refrigerant charge requiring immediate attention.
Annual megohm test baseline. Readings below 10 megohms require immediate motor inspection before the next startup attempt.
Chiller Oil Analysis Schedule
A $50 oil lab test can prevent a $60,000 compressor replacement. Spectrographic analysis detects wear particles weeks before they cause catastrophic bearing failure. OxMaint automates your oil sampling reminders — sign up free.
Frequently Asked Questions
Your Entire Chiller PM Program, Automated
From daily operating logs to annual teardown documentation — OxMaint keeps every task on schedule, every reading on record, and every technician accountable without the paperwork.
