I. Core Characteristics of Mcquay A
1. Key Technical Parameters
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Viscosity: 32.5cSt at 40℃, 5.8cSt at 100℃, with a 121 viscosity index for stable performance across wide temperatures.
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Temperature Adaptability: Pour point -46℃ (low-temperature start-up) and flash point 258℃ (high-temperature safety).
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Stability: Acid value ＜0.05mgKOH/g, resisting oxidation and hydrolysis to reduce sludge and corrosion.
2. Core Functions
It integrates lubrication (reducing wear), sealing (preventing refrigerant leakage), cooling (dissipating heat), and capacity regulation (ensuring smooth load switching).
II. Operation & Maintenance Specifications
1. Oil Change Cycle
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New units: Change oil after 2500 hours (3 months) and clean filters.
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Normal operation: Change every 10000 hours (1 year); 6-8 months for harsh conditions.
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Emergency: Replace immediately if oil turns black, has a burnt smell, or the unit malfunctions.
2. Centrifugal Compressor Oil Change Steps
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Close 4 valves (supply, return, suction, balance) and drain old oil.
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Replace 4 oil pump filters and remove impurities.
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Inject new oil to the standard level.
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Assemble and bleed air to avoid blockage.
3. Precautions
Keep POE oil sealed to avoid moisture; never mix with other oils; follow the manual for filling quantity to prevent liquid hammer or poor lubrication.
III. Common Troubleshooting
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Oil Blockage: Replace oil, flush the circuit with 1.5x oil quantity, and optimize the return pipeline slope to ＞1/100.
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Oil Leakage: Check the oil level switch for alarms; use high-temperature oil return mode for no-oil-level issues; replace shaft seals or use ejectors for leakage.
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Oil Deterioration: Test oil index every 6 months and avoid long-term high-temperature operation.
IV. Selection & Replacement Tips
Only for R134A systems (R22 uses Mcquay C/D). Alternatives: Lanxess EVEREST32/RL32H (POE32), with thorough system cleaning before replacement. Buy OEM-certified products and store sealed.
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