Fault Detection and Diagnostics

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What SDD Object:Property(s) are relevant to this issue?
AirSystem

Explanation of addition, revision, or clarification:
Economizer Fault Detection and Diagnostics (FDD) is referenced as an acronym in 
the ACM, but it is not a unique descriptor.  It is described in Standard 
120.2(i), and there are rules associated with the use of FDD in 5.7.4.1.  Do 
people agree a property should be added to the SDD to indicate whether a system 
includes this capability?

Proposed resolution:
Add a new property (Boolean) AirSystem:FaultDetectionDiagnostics
or AirSys:FDD.  If I don't hear any opposition to this, I will add this to the 
SDD update list on Wed.

Please provide any additional information below.

Original issue reported on code.google.com by da...@360-analytics.com on 1 Apr 2013 at 11:40

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I added it as described as I didn't see any objections. 

Original comment by di...@lmonte.com on 5 Apr 2013 at 7:58

• Changed state: Fixed

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Property added to BEM Base, AirSys:FDDEnabled.  Rules for this have not been 
implemented. Revising owner to DR.

Original comment by da...@360-analytics.com on 24 Sep 2013 at 4:39

• Changed state: Resolved

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John,
Reviewing the current ACM, the only place that I now see FDD referenced is for 
Maximum Outside Air Ratio:

For systems with capacity under 54,000 Btu/h without FDD, the maximum allowed 
value is 0.9. 
It appears that references to FDD has been removed in other areas of the ACM, 
should this reference also be removed?

Original comment by da...@360-analytics.com on 15 Feb 2014 at 7:29

• Changed state: Discussion

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I agree. Removing all references to FDD.

We should set the maximum outside air to 1.0.

No credit for FDD for low capacity systems.

SEE ATTACHED LANGUAGE -- I WOULD LIKE TO INCLUDE THIS IN THE ACM FOR V3A.

Original comment by JohnJArent on 19 Nov 2014 at 10:32

• Changed state: Resolved

Attachments:

• OutsideAirControls_FDD.jpg

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FDD is no longer in the ACM RM. (ACM RM version 4.4 to be released tomorrow, 
corresponding to v3a)

Original comment by JohnJArent on 20 Nov 2014 at 12:07

• Changed state: DoneVerified

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John, 
I can make this change, but it will impact rules and model results.  Right now, 
I have the rule set to prescribe the maximum economizer position to 90% for ALL 
systems (both proposed and baseline) that are < 54kBtu/hr. 

Let me know if you prefer to stick with this assumption, or just revise it to 
no limit for ALL systems.

Original comment by da...@360-analytics.com on 20 Nov 2014 at 12:11

• Changed state: Discussion

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Is there a user input for FDD for larger systems (> 54 kBtu/hr)?  I don't see 
one.

Original comment by JohnJArent on 20 Nov 2014 at 12:22

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No, but in the absence of this issue being resolved, I decided to implement the 
baseline rule and enforce it on the proposed design design as well.

Original comment by da...@360-analytics.com on 20 Nov 2014 at 12:26

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Let's hold off on this until we have a chance to discuss it.

One approach could be:

Set both proposed design and standard design maximum outside air ratio to 0.9 
for all systems < 54 kBtu/hr, and set it to 1.0 for all systems with capacity 
greater than that, since FDD is mandatory for these systems.

Original comment by JohnJArent on 21 Nov 2014 at 2:49

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Re #9: The approach you describe is what is currently implemented in the rules.

Original comment by da...@360-analytics.com on 21 Nov 2014 at 7:35

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Original comment by rhedr...@archenergy.com on 9 Dec 2014 at 8:55

• Changed state: DoneVerified

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I don't think this should be closed out until the NACM is updated to reflect 
the resolution.

Original comment by da...@360-analytics.com on 9 Dec 2014 at 8:58

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Original comment by rhedr...@archenergy.com on 9 Dec 2014 at 9:26

• Changed state: Resolved