McQuay Chillers
McQuay (now part of Daikin Applied) chillers offer reliable performance, innovation in compressor technology, and a wide range of configurations to meet diverse commercial and industrial cooling needs.
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Technical Specifications
Capacity & Efficiency
Airflow & Pressure
Dimensions
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Common Issues & Solutions
Compressor mechanical seal leaks
Symptoms:
Oil leakage, refrigerant loss, high oil consumption, visible oil around shaft area
Solution:
Identify leak source with electronic detector, evaluate extent of damage, perform seal replacement, verify proper shaft alignment, ensure proper lubrication system operation after repair.
Control panel component failures
Symptoms:
Erratic operation, error codes, display issues, relay/contactor failures
Solution:
Perform thorough electrical inspection, check for loose connections, test individual components, update software if applicable, consider control system upgrade for older units with obsolete components.
Water-side heat exchanger corrosion
Symptoms:
Reduced efficiency, high approach temperatures, water leaks, poor water quality
Solution:
Inspect tube condition with borescope or eddy current testing, evaluate water treatment program, clean tubes with appropriate method, implement proper corrosion inhibitors, replace severely damaged tubes.
Cost Information
| Service | Average Cost | Cost Factors |
|---|---|---|
| Annual maintenance contract | $3,000-$8,000 | Unit size, service frequency, refrigerant type, geographic location |
| Compressor replacement | $15,000-$45,000 | Compressor type and size, refrigerant type, labor requirements, crane access |
| New McQuay chiller installation | $50,000-$500,000+ | Unit size, refrigerant type, controls package, installation complexity |
| Control system upgrade | $8,000-$25,000 | Controller type, integration requirements, programming needs, monitoring features |
Frequently Asked Questions
Are McQuay chillers still supported since the Daikin acquisition?
Yes, Daikin Applied continues to fully support the McQuay chiller line with factory parts, technical support, service documentation, and trained technicians. While newer models carry the Daikin brand, McQuay-branded chillers remain fully supported throughout their operational life.
What types of compressors are used in McQuay chillers?
McQuay chillers feature several compressor technologies including single/dual centrifugal compressors, oil-free magnetic bearing centrifugal compressors in the WMC line, rotary screw compressors, and scroll compressors in smaller models. Each type is optimized for specific capacity ranges and applications.
How efficient are older McQuay chillers compared to new models?
Older McQuay chillers typically operate at 0.6-0.8 kW/ton full load and 0.5-0.7 kW/ton IPLV, while newer Daikin-branded replacements can achieve 0.49 kW/ton full load and under 0.3 kW/ton IPLV. Upgrades like VFDs can improve older unit efficiency by 15-30% depending on the application.
What control system retrofits are available for McQuay chillers?
Several control retrofits are available including the MicroTech III upgrade for improved functionality, Daikin's Intelligent Equipment platform for cloud connectivity and analytics, BAS integration modules for modern protocols, and variable frequency drive additions that can be integrated with existing or upgraded controls.
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