There is the following note in the form: "MULTIPLE ZONE Table IEQp1-A1. Mechanical Ventilation - Multiple Zone Unit Note: Systems with local recirculation and/or multiple recirculation paths (such as systems with fan-powered terminals) should use the ASHRAE 62MZ calculator instead of this table" It is not clear to me which systems should use this table and which shouldn't. My project has one injection fan and multiple fancoils.

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Andrew Mitchell, P.E.

Principal

Mitchell Gulledge Engineering, Inc.

LEEDuser Expert

97 thumbs up

Tue, 11/11/2014 - 14:15

If you have a preconditioning unit serving your fan coils, and the fan coils each have one ventilation zone then you should use a signle zone system for each fan coil. Any fan coil that serves multiple ventilation zones should use a 62MZ calc. If your precondition unit just supplies fresh air, then there is no reason to treat it all as one large system.

Meghan Ward

Architectural Technologist, Sustainable Design Consultant

Aurecon South Africa

LEEDuser Basic Member

6 thumbs up

Tue, 02/17/2015 - 10:02

Hi, How would you determine which system the above posted note is applicable to? My project has a VAV system, with AHUs serving single and multiple zones. I am not sure if we should use the 62MZCalc or if we can use the Table IEQp1-A.

Andrew Mitchell, P.E.

Principal

Mitchell Gulledge Engineering, Inc.

LEEDuser Expert

97 thumbs up

Tue, 02/17/2015 - 13:58

For the single zone VAV systems, use the table. For the multi-zone systems, use the 62mz calc.

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