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Commercial Chiller Preventive Maintenance Across NYC
A chiller is the single largest mechanical asset in most NYC buildings — and the one that takes a building offline when it trips on the first 95-degree day. Com+ Mechanical builds preventive maintenance programs for air-cooled and water-cooled chillers, from packaged scroll units to centrifugal machines. We catch fouling tubes, drifting approach temperatures, oil and refrigerant degradation, and starter faults during the shoulder season — before they become a summer no-cooling call.
Chiller Problems Preventive Maintenance Catches Early
Rising condenser approach temperature
On water-cooled machines, a widening gap between leaving-condenser-water and refrigerant condensing temperature signals tube fouling, scaling or non-condensables. It silently raises kW/ton for months; trending it lets us schedule a tube cleaning before efficiency and capacity collapse in peak season.
Low refrigerant charge or a developing leak
Low charge drops evaporator pressure, drives up superheat and can trip the unit on low-pressure/freeze protection. We find and repair the leak and recover/recharge to EPA requirements rather than just topping off a leaking machine year after year.
Oil degradation, low oil pressure or bearing wear
Acid, moisture or metals in a compressor oil sample reveal internal wear long before a bearing or gear fails. Low oil-pressure differential or oil-failure lockouts point to a failing oil pump, clogged oil filter or refrigerant-flooded crankcase — all far cheaper to address before a compressor teardown.
Fouled or dirty air-cooled condenser coils
NYC rooftop and grade-level air-cooled chillers pull in cottonwood, dust and exhaust film that blankets the coils. Restricted airflow raises head pressure and discharge temperature, trips high-pressure safeties on hot days, and accelerates compressor wear. Microchannel coils in particular need correct cleaning technique to avoid damage.
Centrifugal surge or capacity loss
Surge — the violent flow reversal in a centrifugal compressor heard as a recurring 'whoosh' — stems from fouled condensers, low charge, non-condensables or an inlet-vane/control fault. Repeated surging hammers thrust bearings and the impeller. We catch the conditions that cause it during PM.
Starter, VFD or motor-winding degradation
Pitted contactors, a drifting VFD fault history, or a falling megohm insulation reading warn that a starter or hermetic motor is heading toward a failure-to-start or a ground fault. Insulation testing during PM is how we catch a motor before it strands the building without cooling.
Chiller Maintenance Built to Prevent Summer Failures
For office towers, hospitals, data centers, hotels and large mixed-use buildings, the chiller plant carries the entire cooling load — and it is almost always the building's biggest single electrical consumer. A chiller that loses 0.1 kW/ton to fouled tubes or a low refrigerant charge quietly inflates the electric bill all season; a chiller with a degrading motor winding or a seized purge unit fails outright on the hottest day of the year, exactly when load is at peak. Com+ Mechanical's preventive maintenance is designed around that reality. We service centrifugal, screw, scroll and reciprocating machines on R-134a, R-513A, R-1233zd(E), R-514A and legacy R-22 charges, across both air-cooled and water-cooled configurations. Rather than a checklist of resets, we trend operating logs across visits — condenser and evaporator approach, oil pressure differential, suction superheat, motor amps — so we can see a problem developing and schedule the repair on your terms, not at 2 a.m. in July. Every visit is documented for your records and your Local Law 97 reporting.
What Our Chiller Preventive Maintenance Covers
Why Facilities Teams Put Their Chillers on a Com+ Program
Our Simple Process
From call to comfort in 4 easy steps
Plant survey & baseline
We inventory each machine — type, refrigerant, age, controls — and capture a baseline operating log so we know what 'normal' looks like for your specific chillers before the cooling season.
Scheduled PM visits
On a planned schedule (typically a spring start-up/annual and periodic running checks), we perform the full inspection: logs, oil and refrigerant condition, tube and coil checks, safeties, starter and controls.
Trend, report & recommend
We compare each visit against baseline, flag any drift in approach temperature, oil condition or motor insulation, and give you a documented report with a clear, prioritized list of any corrective work.
Corrective work on your schedule
Tube cleaning, leak repair, oil/filter change, eddy-current testing or starter work is scoped and scheduled during low-load periods — keeping the plant ready before peak cooling demand.
Types of Systems We Install
Water-Cooled Chillers (Centrifugal & Screw)
Large-tonnage machines paired with a cooling tower and condenser-water loop, common in NYC office towers, hospitals and campuses. The efficiency workhorse of the building — and the most fouling-sensitive.
- •Condenser & evaporator tube brushing and eddy-current testing
- •Condenser-approach trending to catch fouling and scale
- •Purge-unit service on low-pressure centrifugal machines
Air-Cooled Chillers (Screw & Scroll)
Packaged machines that reject heat directly to outdoor air via condenser coils and fans — frequently rooftop or grade-level, with no tower or condenser-water system to maintain.
- •Condenser-coil cleaning, including microchannel coils
- •Fan-motor, bearing and VFD inspection
- •Head-pressure and ambient-lockout control checks
Modular & Packaged Scroll Chillers
Multiple smaller scroll compressors and modules that stage to match load, used where redundancy and a smaller footprint matter. Maintenance focuses on per-circuit charge, staging and controls.
- •Per-circuit refrigerant and superheat checks
- •Compressor staging and sequencing verification
- •Module-level safety and controls testing
The Com+ Mechanical Difference
Commercial chiller specialists
We work on centrifugal, screw, scroll and reciprocating machines across NYC every season — not the occasional residential split system. Chiller plants are core to what we do.
Diagnostics, not just data logging
We read the logs. Approach-temperature drift, oil-analysis results and insulation readings are interpreted into a clear action plan, not handed over as raw numbers.
Whole-plant and whole-portfolio coverage
One contractor for the chillers, the condenser-water and chilled-water pumps, the cooling towers and the controls — across one building or an entire portfolio.
Built for Local Law 97
Because the chiller is usually the building's largest electrical load, keeping it at design efficiency is one of the highest-leverage moves for your emissions targets — and we document it for reporting.
Transparent Pricing
No fees. No surprises. Just honest service.
Plant Assessment & Baseline
A one-time survey of your chiller(s) with a baseline operating log and condition report.
- On-site inventory of each machine and its controls
- Baseline log: approach temps, pressures, superheat, motor amps
- Visual leak, oil and coil/tube condition check
- Documented condition report with prioritized findings
Preventive Maintenance Agreement
A planned, multi-visit PM program covering start-up and running inspections through the cooling season.
- Spring start-up plus scheduled running PM visits
- Oil & refrigerant service, safeties and starter inspection
- Log trending across visits with drift alerts
- Priority emergency response for covered machines
Portfolio Maintenance Program
A managed program across multiple chillers and buildings with consolidated reporting.
- Coverage for air-cooled and water-cooled machines across sites
- Standardized PM scope and reporting per building
- Coordinated tube cleaning, eddy-current testing and water treatment
- Single point of contact and consolidated documentation
Pricing shown is a structure, not a quote. Final program pricing is confirmed in writing after a plant assessment, scoped to each machine's type, tonnage, refrigerant and condition.
Own a Commercial Property?
Business+ plans start at $499/year — includes 2 rtu tune-ups, 10% off all services, and priority scheduling.
Equipment & Brands We Service
Factory-trained technicians for all major HVAC manufacturers
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Frequently Asked Questions
Get answers to common questions about our services
Do you offer 24/7 emergency response if a chiller fails between PM visits?
Yes. Buildings on a Com+ preventive maintenance agreement get priority 24/7 emergency response across the five boroughs and surrounding metro, so a tripped or down machine is handled fast — even at peak load.
How often should a commercial chiller be on preventive maintenance?
At minimum, an annual spring start-up plus periodic running inspections through the cooling season. Centrifugal and large water-cooled machines benefit from more frequent log checks, with oil analysis, refrigerant analysis and eddy-current tube testing on a periodic cycle. We set the cadence to the machine type, age and duty after assessing the plant.
What's the difference between maintaining an air-cooled vs. a water-cooled chiller?
Air-cooled machines live or die by condenser-coil airflow — we focus on coil cleaning, fan motors, VFDs and head-pressure control, and they have no tower or condenser-water loop. Water-cooled machines add condenser tubes, a cooling tower and a water-treatment program, so we trend condenser approach, brush-clean and eddy-current-test tubes, and coordinate with your water treatment to control scale and fouling. We service both.
Can you maintain chillers across a portfolio of buildings?
Yes. We support property-management companies and owners with chillers across multiple buildings, giving you one vendor, a standardized PM scope, consistent documentation, and coordinated scheduling for tube cleanings and tower work across every site.
How does chiller maintenance help with Local Law 97?
The chiller is typically a building's single largest electrical load, so even a small efficiency loss — fouled tubes, low charge, dirty coils — drives up kWh and emissions all season. Keeping the machine at its design kW/ton is one of the highest-leverage moves for LL97 exposure, and we document operating condition for your reporting.
Do you handle older R-22 and low-pressure refrigerant machines?
Yes. We service legacy R-22 machines as well as R-134a, R-513A, R-1233zd(E) and R-514A charges, including purge-unit service on low-pressure centrifugals. For aging units with rising refrigerant costs or efficiency loss, we'll also show how a retrofit or replacement would affect efficiency and LL97 exposure. All refrigerant work is handled to EPA requirements.
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Get Your Chillers Ready Before the First Heat Wave
Tell us the building, the machines and the plant configuration — we'll survey your chillers, baseline their performance, and build a preventive maintenance program that keeps them running at design efficiency through peak season. Serving property managers, building owners and facilities teams across the NYC metro, 24/7.
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