What Your Chiller Is Telling You
Commercial chiller service starts with the symptoms your operators already see on the panel: approach temperatures creeping up, a compressor that surges at part load, oil level dropping, vibration trips in the middle of the night, or refrigerant leak alarms that will not stay cleared. Each one points to a different part of the machine, and each one gets more expensive the longer it runs.
Large office towers on Bay Street, condo towers in Yorkville and North York Centre, hospitals, schools and industrial plants across the GTA run on central chiller plants. When the chiller is down, the whole building is down. That is why chiller work needs CRE-ticketed techs who work on these machines every week.
Types of Chillers We Service
Centrifugal chillers
The workhorse of Toronto office towers, typically 200-2,000 tons. We service Trane CenTraVac, York YK, Carrier and Daikin WMC machines: bearings, impellers, guide vanes, controls, oil systems and the shell-and-tube evaporator and condenser. Retubes on 100-500 ton machines run $50K-$180K over 7-14 days.
Screw chillers
Common in mid-size buildings and industrial plants, 100-800 tons, including air-cooled Carrier AquaForce units. Typical work: compressor rebuilds, oil separators, slide valves and controls. Full replacement of a 200-800 ton screw chiller runs $150K-$500K over 3-6 weeks.
Absorption chillers (McQuay and others)
Absorption machines use heat instead of a compressor, and turn up in institutional and older plants. Typical problems are crystallization, solution contamination, vacuum loss and tube failures. A McQuay absorption or similar overhaul runs $30K-$150K over 2-4 weeks. We cover these as part of this page because they share the same CRE-ticketed crew and plant-level approach.
How We Diagnose Chiller Problems
We start with your logs and trends: approach temperatures, condenser pressures, oil analysis history, vibration data and alarm records. Then we test:
- Eddy current testing on evaporator and condenser tubes to measure wall loss
- Oil analysis for wear metals, acid and moisture
- Refrigerant leak testing and charge analysis
- Vibration analysis on compressor and motor
- Controls and safeties review
Retube or replace?
If the compressor, motor and shell are sound, a retube often buys 15-20 more years at a fraction of replacement cost. If the machine runs on an outdated refrigerant like R-123 with a failing compressor, replacement with an R-513A or R-1234ze machine may make more sense. We write up both.
How Much Does Chiller Service Cost in Toronto?
| Scope | Price | Timeline |
|---|---|---|
| Centrifugal retube (100-500 ton) | $50K-$180K | 7-14 days |
| Screw chiller replace (200-800 ton) | $150K-$500K | 3-6 wks |
| Absorption overhaul | $30K-$150K | 2-4 wks |
| Mechanical room retrofit | $75K-$300K | 4-8 wks |
Seasonal startup, layup, tube cleaning and testing are quoted per plant. Chiller replacements and VFD retrofits often qualify for Save on Energy incentives; see VFD upgrades and Save on Energy retrofits.
Seasonal Startup and Layup
Toronto chiller plants typically start in April and lay up in October. Startup covers controls, safeties, oil, refrigerant, flow and coordination with the cooling tower. Layup covers tube cleaning, eddy current testing on schedule, oil changes and freeze protection. Bundling both with tower work under one contract means one report and one accountable crew.
Working in Occupied Towers
Downtown chiller work is as much about logistics as mechanics. Tube bundles and compressors move by crane or hoist, which means City of Toronto permits, rigging plans and early-morning lifts. Condo and office towers need tenant notices and board updates. On the Bay Street retube, we handled all of it, and the building went back on primary inside the 9-day window. For the rest of the plant room, see high-rise mechanical room HVAC.
We service chiller plants across Downtown Toronto, North York Centre, Markham office parks and Mississauga industrial sites, alongside the commercial rooftop units and cooling towers on the same buildings.
