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Predictive maintenance of an intelligent FCU
This document discusses predictive maintenance of an intelligent fan coil unit. An intelligent fan coil unit has additional sensors beyond standard units, including air velocity sensors and inlet/outlet water coil temperature sensors. Predictive maintenance of the intelligent unit monitors delta T, approach temperature, and temperature cross of the coil to check performance. It also monitors air filter life. This strategy aims to reduce maintenance costs and time by 67% or more by scheduling maintenance only when needed based on sensor data.
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Predictive maintenance of an intelligent FCU
- 1. Predictive Maintenance ofanPredictive Maintenance of an Intelligent Fan Coil Unit g N. ChazapisN. Chazapis FM Advisor Athens, Greece, Mobile +30.697.3764.467
- 2. Smart Controls FanCoil UnitSmart Controls – Fan Coil Unit
- 3. Standard Fan CoilUnitStandard Fan Coil Unit • Automatic Controls Operation – Cascaded Room temperature PI Control, with high p , g and low limiting of the supply air temperature • Fan Motor Control• Fan Motor Control – 3‐speed automatic selection control based on icapacity, or – Continuous Modulation EC Fan motor • Filter set EU3 (G3)
- 4. Standard Maintenance FCUStandard Maintenance ‐FCU • Maintenance tasks – Every 3 months clean filtery – Every 12 months change filter Every 12 months inspect condensate drain– Every 12 months inspect condensate drain – Every 24 months clean water coil
- 5. Intelligent FCUIntelligent FCU • A smart FCU has some more sensors than supply air temp and room temp sensors: –A single point air velocity sensor. – Two Temperature sensors on inlet / outlet of water p / coil. • FCU Capacity modulation of the control valve:FCU Capacity modulation of the control valve: – At Low speed up to 60% of max. capacity At Middl d t 85% f it– At Middle speed up to 85% of max. capacity – At High speed up to 100% of max. capacity
- 6. Predictive Maint onIntelligent FCUPredictive Maint. on Intelligent FCU • On water coil enter/leaving to check the correct Delta T (12C‐7C).( ) • Approach temperature of the coil Heat exchanger (14C 7C)exchanger (14C – 7C). • Temperature cross of the coil HX (14C‐12C). • Air flow through filter on fan high speed for estimating the life of the EU filterestimating the life of the EU filter.
- 7. Intelligent fan coilunit Pd MIntelligent fan coil unit – Pd M. • Strategy for Maintenance cost savings – Time for filter cleaning hrs.g __ – Time for procurement and change filter __ hrs. Time for inspection and cleaning drainage hrs– Time for inspection and cleaning drainage __ hrs. – Time for inspection and clean water coil __ hrs. – Time for controls testing __ hrs. – Total Time required for project __ hrs. ( __ days).
- 8. Intelligent fan coilunit Pd MIntelligent fan coil unit – Pd M. • What happens when Pd M is designed? – Depending on quantities in a building or in p g q g facilities, the maintenance time can be reduced by 67% or more!
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