Commercial chiller maintenance in Detroit requires a scope that goes beyond quarterly filter swaps. Water cooled and air cooled units serving industrial plants and commercial buildings in Wayne County face tube fouling, oil degradation, and seasonal cold soak stress that standard PM programs miss. Samco Facilities Maintenance provides full chiller PM including eddy current tube testing, oil analysis, and annual condenser inspections for accounts across Southeast Michigan. Call (734) 838-6300 to schedule a site assessment.
Why Chiller PM Is the Highest Stakes Visit in a Building
A chiller failure mid-summer is not an inconvenience. For a Detroit manufacturer running process cooling, it is a production stop. For a commercial office tower in Southfield, it is tenant complaints and lease risk. Chillers carry the highest repair cost of any single HVAC component in a building, with compressor overhauls frequently running $40,000 to $90,000 and full replacements pushing past $200,000 for centrifugal units above 200 tons.
What makes chiller PM the most consequential service visit is the compounding nature of neglect. A condenser tube that starts fouling in March will show degraded approach temperatures by June, push the compressor into elevated head pressure by August, and trip on high discharge in a heat wave. None of those steps generate a BAS alarm until the last one, and by then the damage is already underway.
Facility managers across Wayne County, Oakland County, and Macomb County who treat chiller PM as a checkbox event consistently spend more on emergency repair over a five year period than facilities that run a structured annual PM scope. The prevention only works if the technician is doing more than looking at the unit and writing a passing grade on the form.
The Full Water Cooled and Air Cooled Chiller PM Scope
A defensible chiller PM scope covers a different list depending on whether the unit is water cooled or air cooled.
For water cooled chillers: condenser and evaporator tube inspection and cleaning, refrigerant charge verification, oil sample collection for lab analysis, approach temperature measurements for both circuits, purge unit test on centrifugal machines, motor winding insulation test, vibration baseline on the compressor, and refrigerant log update per EPA 608 Universal requirements. For chillers past five years of service on Detroit municipal water in open cooling tower loops, eddy current tube testing should be added to the annual scope. This non-destructive test identifies wall thinning, pitting, and stress cracking before a tube rupture contaminates the refrigerant circuit.
For air cooled chillers: condenser coil cleaning, refrigerant charge check, economizer coil inspection if equipped, fan motor amp draw, control board fault log review, and glycol concentration check for low ambient protection.
Oil analysis deserves its own attention. A lab that runs a sample for metals, moisture, and acid number can tell you within a few weeks whether a compressor is shedding bearing material, whether refrigerant is migrating into the oil, and whether the oil change interval needs shortening. That data point has stopped compressor replacements that would have otherwise been classified as unexpected failures. It is not an optional add-on for any chiller past three years of service.
Buildings with documented annual PM scopes experience 30 to 40 percent fewer unplanned compressor failures over a ten year horizon compared to run-to-fail profiles. A 200-ton water cooled screw chiller in a Detroit industrial facility can reach 20 to 25 years of service life with PM. Without it, that drops below 15.
The Michigan Angle: Detroit Water Chemistry and Scale Management
Detroit municipal water chemistry is one of the specific reasons eddy current testing intervals should be shorter in Wayne County than national averages suggest. The Detroit Water and Sewerage Department supplies water with total dissolved solids and mineral content levels that accelerate scaling on condenser tube interiors in open cooling tower applications. Buildings that pull from Detroit city water and run open loop towers typically see meaningful fouling deposits inside 18 to 24 months.
The national guidance from AHRI and chiller manufacturers recommends eddy current testing every three years as a baseline. In practice, Wayne County facilities on open loops should be running that test every two years. The fouling cycle is faster, and the consequences of a missed tube failure in a Detroit summer are the same as anywhere else: a flooded refrigerant circuit, a compressor on order, and a building full of heat.
Great Lakes humidity compounds the air cooled side of the problem. Outdoor air cooled units in Livonia, Detroit, and Warren run elevated ambient wet bulb conditions throughout July and August that push condensing pressure above design. That stress accelerates bearing wear on condenser fan motors and shortens the interval before coil cleaning becomes necessary. A coil that looks clean from the ground can be 15 to 20 percent fouled on the interior fin surfaces, which is enough to add 8 to 10 degrees of approach and push head pressure into the amber zone.
When Eddy Current Tube Testing and Oil Analysis Make Sense
These two diagnostic tools are for chillers that fit specific profiles. Here is where they pay off:
- Eddy current testing: water cooled units past 5 years of service. Any centrifugal or screw chiller on a water cooled circuit that has been running for five or more years without a tube inspection should get a baseline eddy current test immediately. This is especially true for units on Detroit city water or open cooling tower loops.
- Eddy current testing: after a legionella remediation. If a cooling tower has been treated for a biological event, the chemical treatment can accelerate tube corrosion. An eddy current sweep within 90 days of treatment confirms whether the tubes took damage.
- Oil analysis: any chiller past 3 years of service running more than 2,000 hours per year. A $40 to $80 oil sample can flag a bearing problem that would otherwise manifest as a $60,000 compressor overhaul. The math is straightforward.
- Oil analysis: after any refrigerant leak and recharge event. Moisture contamination from an open circuit repair can degrade oil faster than normal operation. A baseline oil sample after recharge sets the monitoring clock.
- Both tests: before any chiller warranty extension purchase. A manufacturer offering an extended warranty will typically require proof of PM history. An eddy current report and oil analysis file is the documentation that keeps a warranty offer on the table.
Here is what gets missed. Seven of ten chillers Samco inspects for the first time at a new account have no oil analysis history on file. The property manager knows the chiller is old, knows it runs warm in August, and has replaced one condenser fan motor in the past two years. They do not know whether the compressor oil has 200 ppm of water in it. That gap is where the $80,000 surprise comes from.
How Samco Runs Chiller PM for Commercial and Industrial Accounts
Samco Facilities Maintenance has run chiller PM for commercial and industrial accounts across Wayne, Oakland, Macomb, and Washtenaw counties since 1997. Our technicians carry EPA 608 Universal certification. We hold a BBB A+ rating and have the manufacturer credentials required to keep centrifugal and screw chiller warranties intact.
A Samco chiller PM starts before the technician arrives. We pull the service history, review last season’s runtime logs, and build the visit scope against the actual equipment age and application. A 12-year-old 300-ton centrifugal chiller in a Detroit industrial plant gets a different scope than a 4-year-old 60-ton air cooled unit at a Livonia office building. We do not run the same form on both.
On site, we pull oil samples and ship them to an independent lab, run approach temperature measurements on both circuits, clean condenser coils or coordinate tube cleaning for water cooled units, and log refrigerant charge against nameplate. For accounts where eddy current testing is due, we coordinate a specialized crew and present findings with tube-by-tube condition maps. A Warren food manufacturer we have serviced since 2008 runs a 250-ton water cooled screw chiller in their blast freezing room. We catch the eddy current test on a two year cycle and have extended that unit’s service life by at least six years past what deferred PM would have allowed.
To get chiller PM scheduled, call (734) 838-6300 or visit our contact page. Learn more about our commercial HVAC services, preventive maintenance programs, and manufacturing facility support.
Frequently Asked Questions
How often should a commercial chiller be serviced?
Water cooled chillers above 50 tons should receive a full PM scope at least annually, with semi-annual visits for units running more than 3,000 hours per year. Air cooled chillers need at minimum an annual coil cleaning, refrigerant check, and oil inspection. Buildings with process cooling loads or 24/7 runtime should schedule semi-annual visits regardless of unit type.
What is eddy current tube testing and when does a chiller need it?
Eddy current tube testing is a non-destructive inspection method that sends an electromagnetic probe through each condenser tube to detect wall thinning, pitting, and corrosion. It identifies tube failures before they rupture and contaminate the refrigerant circuit. Any water cooled chiller past five years of service in Wayne County should have a baseline eddy current test on record, with follow-up every two years on Detroit municipal water systems.
Do you service water cooled and air cooled chillers in Detroit?
Yes. Samco Facilities Maintenance services both water cooled and air cooled chillers across Detroit and the broader Southeast Michigan market including Dearborn, Livonia, Warren, Troy, and Ann Arbor. We cover centrifugal, screw, and scroll chiller configurations and carry the manufacturer credentials required to service most major brands without voiding warranty coverage.
What is an acceptable chiller approach temperature?
Acceptable approach temperature on a properly maintained chiller is typically 1 to 3 degrees Fahrenheit on the evaporator side and 2 to 5 degrees on the condenser side at design conditions. Readings above 5 degrees on the evaporator or above 8 degrees on the condenser indicate fouling, scaling, or refrigerant charge issues that need correction before the next cooling season.
Ready to Book Chiller PM?
If your chiller is past its last full PM scope, past five years without a tube inspection, or heading into summer without an oil analysis on file, now is the time to schedule. Samco Facilities Maintenance serves commercial and industrial accounts across Southeast Michigan from our Livonia, MI headquarters. We carry EPA 608 Universal certification and have supported building operators in Wayne, Oakland, Macomb, and Washtenaw counties since 1997.
Call (734) 838-6300 or visit our contact page to schedule a chiller assessment. You can also review our full service lineup to see how we support HVAC, refrigeration, and manufacturing facility needs across the region.