{"id":"crac-unit","version":"0.2.0","classification":{"uniformat":"D3050"},"names":["Computer room air conditioner"],"aliases":["CRAC","server room AC"],"service_life":{"median_years":15,"range_years":[15,15],"range_basis":"source_spread"},"pm_tasks":[{"task":"Inspect cabinet, isolators and supports; tighten loose fasteners","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Check filters; replace as needed","frequency":"P1M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Leak-check refrigerant circuit; check charge and oil level","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Check refrigerant charge and compressor oil level","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Clean condensate drain pan and drain lines","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Check fan bearings for heat","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Check fans for unusual noise or vibration","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Check and tighten fan fasteners","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Lubricate fan sleeve bearings","frequency":"P1M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Lubricate fan ball bearings","frequency":"P3M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Lubricate fan roller bearings","frequency":"P1M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Inspect belts and pulleys","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Measure and adjust belt tension and alignment","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Clean dirt or scale from fan blades or wheel","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":117,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Inspect fan internals; repair coatings; rebalance if needed","frequency":"P1Y","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Check damper positions and adjust position switches","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Exercise dampers for free movement","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Inspect damper seals","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Clean damper operator and linkage; oil lightly","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Clean, inspect and lubricate damper bearings","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Record compressor head, suction and oil pressures and temperature","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Record compressor and fan motor amps and volts","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"},{"task":"Clean, inspect and calibrate controls and safety devices","frequency":"P4M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":118,"checklist":"Table 14-2 Package air conditioning (DX) unit"}],"basis":[{"type":"public_document","life_type":"planning","title":"Energy Conservation Standards for Computer Room Air Conditioners and Air-Cooled, Three-Phase, Small Commercial Package Air Conditioning and Heating Equipment (notification of data availability and RFI), 85 FR 60642, September 25, 2020","by":"U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy","url":"https://www.govinfo.gov/content/pkg/FR-2020-09-25/pdf/2020-18778.pdf","page":30,"code":"III.D.1","label":"Equipment Lifetime: \"DOE used a 15-year lifetime for all CRAC equipment classes\"","years":15,"note":"Printed page 60671. Direct match: all computer room air conditioner classes."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["Every source here is a published planning, design or accounting life. None is observed replacement data.","Some maintenance intervals come from TM 5-692-1, an Army manual for mission-critical (C4ISR) facilities; they may be tighter than typical commercial practice."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-21","canonical_url":"https://unfinished.one/c/crac-unit","versioned_url":"https://unfinished.one/c/crac-unit/v/0.2.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Computer room air conditioner, v0.2.0. https://unfinished.one/c/crac-unit/v/0.2.0"}