pg&e pacific energy center presents:pg&e pacific ... - hawaii · 2008 title 24...
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PG&E Pacific Energy Center Presents:PG&E Pacific Energy Center Presents:2008 Title 24 Nonresidential HVAC and Acceptance Test Requirements
Mark Hydeman, PE, FASHRAEmhydeman@taylor-engineering commhydeman@taylor engineering.com Taylor Engineering
Erik Kolderup, [email protected] ConsultingKolderup Consulting
September 15th, 2009
H d tHandouts You can get a copy of the handouts in PDF
f t f llformat as follows:– Enter the following link into Internet Explorer:
http://pub.taylor-engineering.com/p p y g g– When prompted enter the following (case
sensitive)• USER: seminar• USER: seminar• PASSWORD: public
– Double click on the folder, “Title 24 2008”– Double click on a file to download it or highlight
the file and click on the download file icon– NOTE: YOU MUST USE WINDOWS INTERNET
Page 1EXPLORER TO ACCESS THIS SITE!
Ackno ledgementsAcknowledgements
CEC Commissioners: Robert Pernell & Art Rosenfeld CEC Staff: Bill Pennington, Mazi Shirakh, Tav Commins &
Nelson Pena Project Team Lead: Charles Eley Architectural Energy Project Team Lead: Charles Eley, Architectural Energy
Corporation PG&E CASE Initiatives: Steve Blanc & Pat Eilert Content Contributors:
– Taylor Engineering: Steve Taylor, Jeff Stein & Anna Zhou– AEC: Erik Kolderup– HMG: Jon McHugh
PECI: Kirstin Pinit Kristin Heinemeier & Larry Luskay– PECI: Kirstin Pinit, Kristin Heinemeier & Larry Luskay
Page 2PG&E PEC Seminar Title 24 2008
What e ill co erWhat we will cover
New HVAC requirements Updated acceptance test requirements (for
HVAC)HVAC) Updated acceptance test forms
NOT existing measures (with a few exceptions)exceptions)
NOT envelope and lighting changes NOT residential
Page 3PG&E PEC Seminar Title 24 2008
NOT residential
AgendaAgenda
Introduction and OverviewHVAC ChangesBreakAcceptance Testing OverviewAcceptance tests 1 of 3LunchAcceptance tests 2 of 3Acceptance tests 2 of 3BreakAcceptance tests 3 of 3Wrap-upp p
Page 4PG&E PEC Seminar Title 24 2008
Iconographic KeIconographic Key
Mandatory Measure
Prescriptive MeasurePrescriptive Measure
Acceptance Test
Page 5PG&E PEC Seminar Title 24 2008
I t d ti & O iIntroduction & Overview
Timing?Timing?
January 1st, 2010 August 1, 2009
Page 7PG&E PEC Seminar Title 24 2008
Reso rces 2008 StandardResources – 2008 Standardhttp://www.energy.ca.gov/title24/2008standards
The Standard, Title 24 The Appendices
p gy g
The Appendices JA Joint Appendices (e.g. JA2 Reference Weather/Climate
Data) RA Residential Appendices (e g RA2 HERS Testing) RA Residential Appendices (e.g. RA2 HERS Testing) NA Non-Residential Appendices (e.g. NA7 Acceptance
Requirements for Nonresidential Buildings The Non Residential Compliance Manual The Non-Residential Compliance Manual
Examples References
C li F
Page 8PG&E PEC Seminar Title 24 2008
Compliance Forms
Reso rces 2008 StandardResources – 2008 Standard
http://www.energy.ca.gov/title24/2008standards
Bill Penningtonbpenning@energy state ca [email protected]
Mazi [email protected]@energy.state.ca.us
Energy Efficiency Hotline– E-mail: [email protected]– Phone: 916-654-5106 or– Phone: 1-800-772-3300 (toll free in Calif.)
Page 9PG&E PEC Seminar Title 24 2008
Other Reso rcesOther Resourceshttp://www.taylor-engineering.com/publications/title 24 resources.shtml
PIER VAV Design Guidehttp://www.energydesignresources.com/Resources/Publications/DesignGuidelines.aspx
p y g g p _ _
ASHRAE Guideline 16htt // h
HERS Agencies
http://www.ashrae.org
http://www.calcerts.comhttp://www.cheers.org
http://www energy ca gov/HERS/
Page 10PG&E PEC Seminar Title 24 2008
http://www.energy.ca.gov/HERS/
Overview of Title 24Overview of Title 24 and 2008 Changesand 2008 Changes
B ilding Code O er ieBuilding Code Overview
Whoohoo, I’m code certified!
PIER Research Building CodesUtility Incentives Product Rebates
Page 12Slide 12
LEED Platinum LEED Rated
AEDG GuidesSPC 189 90.1 & T24
LEED Gold/Silver
C d C li P thCode Compliance Paths
Line Item Measures
PrescriptiveM Alt t P th
OR
Mandatory
Measures Alternate Paths(e.g. Lighting)ORAND
Measures
Page 13
PerformanceMethod
Standards Str ct re & TimingStandards Structure & TimingStart
Design
Mandatory Measures
g
Prescriptive Measures
Performance Approach
Submit Permit
Acceptance Tests
ConstructionAcceptance Tests
and Installation Certificates
Certificate of
Page 14PG&E PEC Seminar Title 24 2008
Occupancy
Mandator Meas resMandatory Measures
Must be done in all projects (no trade off) Things that can’t be modeled or shouldn’t be g
traded off Examples
– Equipment efficiencies– Ventilation requirements– Temperature controls– Load calculations
Page 15PG&E PEC Seminar Title 24 2008
Prescripti e Meas resPrescriptive Measures
Can be traded off through the performance method of compliancep p
Examples– Economizers– Economizers– Variable air flow
Limitations on electric resistance heat and– Limitations on electric resistance heat and air cooled chillers
Page 16PG&E PEC Seminar Title 24 2008
Performance ApproachPerformance Approach
Computer simulation of a project Two models made:
– Budget model meets the mandatory and prescriptive requirements
– Design model represents your projectDesign model represents your project Project complies if TDV of design is less than
or equal to TDV of budget model Can trade off envelope, HVAC and lighting
energy
Page 17PG&E PEC Seminar Title 24 2008
Performance Method (90 1)Performance Method (90.1)
This building hasa limited WWR, and...
an assigned HVACsystem type
Page 18Slide 18
Title 24 2008 ChangesTitle 24 2008 Changes
General– Electronic signatures allowed (§10-103)– Info provided by builder to owner regarding compliance, operationInfo provided by builder to owner regarding compliance, operation
& maintenance, and ventilation may be in electronic form (§10-103)– Changes to the TDV values
Envelopep– New Solar Reflection Index (SRI) for rating of Cool roofs– New Cool Roof requirements for steep sloped applications– Cool Roof requirements for replacements, recovering or recoating Coo oo equ e e ts o ep ace e ts, eco e g o ecoat g
existing roofs– New Component Modeling Approach (CMA) certification for site
built fenestration
Page 19PG&E PEC Seminar Title 24 2008
Title 24 2008 Changes (cont )Title 24 2008 Changes (cont.)
Envelope– Insulation requirements for roofs, walls and floors in certain
climates (especially metal-framed walls)climates (especially metal-framed walls)– New acceptance requirements for fenestration– Skylights for Daylighting in Buildings§131(c) required when
S l th 8 000 ft2 d• Space larger than 8,000 ft2, and• Ceiling height greater than 15 ft, and • Lighting power density greater than 0.5 W/ft2
Page 20PG&E PEC Seminar Title 24 2008
Title 24 2008 Changes (cont )Title 24 2008 Changes (cont.)
Lighting– Revisions to the lighting power densities (LPDs) interior
§146 and exterior §147§146 and exterior §147– Sign lighting §148 – New requirements for occupancy sensors §131(d)
Offi 250 ft2• Offices 250 ft2• All classrooms and conference rooms
– New demand response controls for indoor lighting (large retail only) §131(g)retail only) §131(g)
– New daylighting controls for side light §131(c)– New and revised acceptance requirements for lighting
t l
Page 21
controls
PG&E PEC Seminar Title 24 2008
T24 2008 HVAC ChangesT24 2008 HVAC Changes
Mandatory Requirements Setback Thermostat for Unitary Equipment (112(c)) Recirculating Water Heating Loop Design and
Control (113(c)) Covers for all Outdoor Pool and Spas (Exception toCovers for all Outdoor Pool and Spas (Exception to
114(b)2) DCV (121(c)3 & 4) [Elaborated Later]
C t l D d Sh d (122(h)) [El b t d L t ] Central Demand Shed (122(h)) [Elaborated Later] Acceptance Tests (125 and NA7) Refrigerated Warehouses (126) [Elaborated Later]
Page 22Slide 22
g ( ) [ ]
R f i t d W h (§126)Refrigerated Warehouses (§126)
New in 2008 Standard Applies to spaces >3,000 ft2pp p Provide minimum insulation levels Limits on underslab heating by electric heatg y Variable speed evaporator and condensing
unit fans Limits on condensing temperatures Some requirements for compressors
Page 23Slide 23
So e equ e e s o co p esso s
T24 2008 HVAC ChangesT24 2008 HVAC Changes
P i ti R i tPrescriptive Requirements Reheat/Recool Limitation (§144(d)) [Elaborated Later] Removed VAV exception for Supply Air Temperature Reset Removed VAV exception for Supply Air Temperature Reset
(§144(f)) Added AC units to Water-Cooled HP Variable Flow (§144(j)5) Hydronic Supply Pressure Reset for systems with DDC to the Hydronic Supply Pressure Reset for systems with DDC to the
zone (§144(j)6) Hydronic Heat Pump Loop Deadband (§144(j)7)
Single Zone (SZ) VAV (§144(l)) [Elaborated Later] Single Zone (SZ) VAV (§144(l)) [Elaborated Later] Increased stringency for economizer/EER tradeoffs (Table
§144A and B)
Page 24Slide 24
R h t/ l Li it ti 144(d)Reheat/cool Limitation 144(d)
For non-DDC (direct digital control) systems – Reduces min VAV airflow to 30%
For DDC systems– Reduces reheat/recool to 20% in deadband– Allows reheat/recool to 50% at peak heating
In both cases, the minimum can be increased t t th til ti i tto meet the zone ventilation requirements
Page 25Slide 25
R h t/ l Li it ti 144(d)
ADVANTAGESReduced reheatReduced fan energyReheat/cool Limitation 144(d)Does not push zone into heatingReduced stratification at full heating
Traditional VAV Reheat/cool Control Dual Maximum VAV Reheat Control
Supply Air Temperature Setpoint(requires discharge temp. sensor)
Max Cooling Airflow Setpoint
Maximum Supply Air
Temperature
Reheat Valve Position
Maximum Airflow Setpoint
Minimum Airflow
Airflow SetpointMinimum
Airflow Setpoint
Airflow Setpoint
Airflow Setpoint
Heating Loop Cooling LoopDeadBand
(shaded area = reheat)(shaded area = reheat)
Heating Loop Cooling LoopDeadBand
(shaded area = reheat)(shaded area = reheat)
Slide 26
Single Zone VAVSingle-Zone VAV
Scope– Effective 1/1/2012– All unitary air conditioners and air-handling units 10 tons andAll unitary air conditioners and air handling units 10 tons and
over Requirement
– 2-speed or VSD fan– 2-speed or VSD fan– Must reduce airflow by 2/3 or greater at low loads
Some changes in 90.1 languageAHU & FCU t 5 h l– AHUs & FCUs at 5 hp or larger
– AHUs & FCUs start in 2010 Industry consensus through negotiation
Page 27Slide 27
T24 2008 HVAC ChT24 2008 HVAC Changes
Compliance Credits TES (NR ACM 3 3 18) TES (NR ACM 3.3.18) DES/DXAC (NR ACM 3.3.19)
AFDD (NR ACM 2 5 2 6 2 5 2 7 d AFDD (NR ACM 2.5.2.6, 2.5.2.7 and 2.5.3.12)– 5% improvement in cooling efficiency– 10% improvement on VAV minimums
Page 28Slide 28
AFDD Example(Schien and Bushby NIST)(Schien and Bushby NIST)
Possible Diagnoses
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enci
High zone temperature alarm X X X X X X X X X X XLow zone temperature alarm X X X X X X X X X X XHigh airflow alarm X X X X X X
Alarm Description
Page 29
gLow airflow alarm X X X X X X X X XUnstable airflow alarm X X X X X X X X XHigh discharge temperature alarm X X XLow discharge temperature alarm X X X
450 Golden GateDemonstration of NIST AFDD Algorithms
Page 30
Image used with permission from Off the Mark Cartoons
Page 31
T24 2008 HVAC ChT24 2008 HVAC Changes
Documentation Revisions to MECH 1-C Certificate of
Compliance New Field Inspection Checklist New Installation Certificate
(10-103(a)3A) No form Mech 1-A Reorganized Acceptance Test Forms
Page 32(Certificate of Acceptance)
Slide 32
Compliance forms end in “–C”
Page 33PG&E PEC Seminar Title 24 2008
AC 1 to 5 5 AH 1 to 2 2
CHW System 1
Page 34Title 24 2008
This form is used for compliance options only!
Page 35
New Field I tiInspection Checklist Filled out by
designer or Title 24 documentation author (or automatically by compliance software)
Used by field inspector to help
fidentify critical components
Page 36PG&E PEC Seminar Title 24 2008
Installation Certificate Completed by
licensed person responsible for building construction or installation of the mechanical system
Certifies that installed system meets code requirements
Page 37PG&E PEC Seminar Title 24 2008
What’s ne t?What’s next?
Extension of Scope– UBC Type I Occupancies (Title 24)– Data Centers– VAV Fume Exhaust (already in 90.1)– Refrigerated Casework– Kitchen Exhaust
Pl L d– Plug Loads– Elevators
Energy RecoveryC (C f C & ff) Chillers (Centrifugal Coverage & NPLV Tradeoff)
Compliance Kernel [next slide]
Page 38Slide 38
PIER F nded Compliance KernelPIER Funded Compliance Kernel
Designed to work with multiple rulesets:• ASHRAE 90.1
ASHRAE 189Kernel
3rd Party
• ASHRAE 189• LEED• T24...
yProgram
Page 39Slide 39
Acceptance TestingAcceptance Testing OverviewOverview
Acceptance TestsAcceptance Tests
Defined in Standard’s Mandatory Section 125
Detailed in the Appendix NA7 Nonresidential Compliance Manual Nonresidential Compliance Manual
– Test Descriptions in Chapter 10F i A di A– Forms in Appendix A
Page 41PG&E PEC Seminar Title 24 2008
A t R i t (1 f 2)Acceptance Requirements (1 of 2)ACM Section and Test
Standard Section
Certificate of AcceptanceACM Section and Test Section Acceptance
NA 7.5.1.1 Variable Air Volume Systems Outdoor Air 125(a)1 MECH-2A
NA 7.5.1.2 Constant Volume Systems Outdoor Air 125(a)1 MECH-2A
NA 7 5 2 Constant Volume Packaged HVAC Systems 125(a)2 MECH-3ANA 7.5.2 Constant Volume Packaged HVAC Systems 125(a)2 MECH-3A
NA 7.5.3 Air Distribution 125(a)3 MECH-4A
NA 7.5.4 (Air-Side) Economizer 125(a)4 MECH-5A
NA 7 5 5 Demand Control Ventilation 125(a)5 MECH-6ANA 7.5.5 Demand Control Ventilation 125(a)5 MECH-6A
NA 7.5.6 Supply Fan Variable Flow Controls 125(a)6 MECH-7A
NA 7.5.7 Valve Leakage Test 125(a)7 & 8 MECH-8A
NA 7 5 8 Supply Water Temperature Reset Controls 125(a)9 MECH-9AUpdated NA 7.5.8 Supply Water Temperature Reset Controls 125(a)9 MECH 9A
NA 7.5.9 Hydronic System Variable Flow Controls 125(a)7 MECH-10A
NA 7.5.10 Automatic Demand Shed Controls 125(a)10 MECH-11ANew
Updated
Page 42PG&E PEC Seminar Title 24 2008
Acceptance Requirements (2 of 2) p q ( )Compliance Credits
Standard Certificate of ACM Section and Test
Standard Section
Certificate of Acceptance
NA 7.5.1.11 FDD for Packaged DX Systems 125(a)11 MECH-12A
NA 7.5.1.12 FDD for AHUS and Zone Terminal Units 125(a)12 MECH-13AAll NewNA 7.5.1.13 Distributed Energy Storage DX AC Systems 125(a)13 MECH-14A
NA 7.5.1.14 Thermal Energy Storage Systems 125(a)14 MECH-15A
Page 43PG&E PEC Seminar Title 24 2008
Compliance ProcessCompliance Process
Design is checked and a signed certificate of compliance is submitted for pthe building permit
Tests are performed and a signed certificate of acceptance is submitted forcertificate of acceptance is submitted for the certificate of occupancy
Page 44PG&E PEC Seminar Title 24 2008
Wh A t T ti O ?When Acceptance Testing Occurs?
Specified during the design phase
Implemented during constructionAft t t ( t f d t l k )– After start-up (except for duct leakage)
– Before occupancy
Page 45PG&E PEC Seminar Title 24 2008
Who Does Acceptance Testing?Who Does Acceptance Testing?
Can be done by – Engineer, or– Contractor, or– 3rd Party
Different parties can do different tests, but…
Someone has to sign the final certificate of acceptance
Page 46PG&E PEC Seminar Title 24 2008
How to Specify the Acceptance p y pTests Where do they go in the specifications?
– Under TAB Section?– Under Controls?Under Controls?– Under Commissioning?– Throughout several sections?
Wherever you put it you must be clear about: Wherever you put it you must be clear about:– Who does the work (roles and responsibilities)– What work they must do
Wh it t b d– When it must be done– Submittal requirements– Who signs the forms
Page 47PG&E PEC Seminar Title 24 2008
Acceptance forms end in “–A”
Two Sign-Off Blocks!TesterTester
Reviewer (licensed)
BreakBreak
Minimum Outdoor Ventilation Air Requirements & A tAcceptance
Title 24 Mechanical VentilationRequirement Review (§121) (§121b2)Mechanical Ventilation: The larger of:
– Table 121-A for building borne contaminants; and – 15 cfm per person (for bioeffluents) times the expected15 cfm per person (for bioeffluents) times the expected
number of occupants. No less than ½ the occupancy in Chapter 10 of the CBC.
(Exception to §121b2) Zones can be served by ( p § ) ytransfer air if both of the following are true– the source does not have any unusual contaminants – the system brings in the sum of the outdoor air required bythe system brings in the sum of the outdoor air required by
the zonesFor Title 24 the zone level supply air (mixed return and OSA) is equivalent to ventilation air!!
Page 51PG&E PEC Seminar Title 24 2008
and OSA) is equivalent to ventilation air!!
Building (and Process) g ( )Contaminants - Table 121-A
Page 52PG&E PEC Seminar Title 24 2008
Title 24 ses ½ the occ pant densitTitle 24 uses ½ the occupant density(twice the ft2/person)
2422 /30/15 TCBC personftpersonft
Page 53PG&E PEC Seminar Title 24 2008
Titl 24 V til ti R i tTitle 24 Ventilation Requirements
Page 54SMACNA Seminar Title 24 2008
Design Minimum Outside Air MECH-3CgVAV-O = office space, VAV-A = assembly space, Min O/A in Column I
This should be changed to 50% max for DDC zones and 30% max for non-DDC Zones
VAV O 1 000 0 15 150 5 75 150 160 250 400 400 300 N/A
Min O/A for MECH-2A
VAV-O 1,000 0.15 150 5 75 150 160 250 400 400 300 N/A
VAV-A 1,000 0.15 150 34 510 510 510 600 400 600 550 N/A Totals 39 660 670 0
OSA Acceptance TestOSA Acceptance Test
Page 56PG&E PEC Seminar Title 24 2008
P rposePurpose
Verification of minimum OSA as scheduled on plansp
Verification that minimum OSA is provided throughout the range ofprovided throughout the range of operation in a VAV system and at design for CV systemsdesign for CV systems
Page 57PG&E PEC Seminar Title 24 2008
O er ieOverview
References– Standard Sections §121(b), §121(c) andStandard Sections §121(b), §121(c) and
§125(a)1– Appendix NA 7.5.1pp– Nonresidential Compliance Manual 10.6.2
Scope Scope– New systems only (CV and VAV)
Page 58PG&E PEC Seminar Title 24 2008
B R i t i Titl 24Base Requirement in Title 24
§121(c) Operation and Control Requirements for Minimum Quantities of Outdoor Air.– 1. Times of occupancy. The minimum rate of
outdoor air required by Section 121 (b) 2 shall be supplied to each space at all times when thesupplied to each space at all times when the space is usually occupied.
– …– NOTE: VAV must comply with Section 121 (c) 1 at
minimum supply airflow.
Page 59PG&E PEC Seminar Title 24 2008
Acceptance Requirement p qin Title 24
Page 60PG&E PEC Seminar Title 24 2008
Acceptance Test from Nonres. Appendices
PG&E PEC Seminar Title 24 2008
Acceptance Test from Nonres. Appendices
Page 62PG&E PEC Seminar Title 24 2008
Related TestsRelated Tests
NA 7.5.4 (Air-Side) Economizer Acceptance
NA 7.5.5 Demand Control Ventilation Acceptance
NA 7.5.6 Supply Fan Variable Flow Controls Acceptance (VAV only)You can reduce testing time by combining tests on a unit
Page 63PG&E PEC Seminar Title 24 2008
Construction Inspectionp
Calibration of AFMS or calibrated damper (if part of the system)p ( p y )
Verify that there is a provision for dynamic control of OSA (if VAV)dynamic control of OSA (if VAV)
Verify that there is a provision for minimum OSA (if CV)minimum OSA (if CV)
Page 64PG&E PEC Seminar Title 24 2008
Fixed Minimum OA Damper pPosition (common)
Does NOT WORK since mixed air plenum pressure varies!! Outdoor air flow will varypressure varies!! Outdoor air flow will vary
proportional to supply air flow
Outdoor Air Intake
Minimum
Return Air
Minimum Signal Pot.
Si l f
Page 65PG&E PEC Seminar Title 24 2008
Signal from SAT Controller
ASHRAE RP980 Lab ResultsFixed Minimum OA Damper
%
70%
80%
90%
100%
110%
30%
40%
50%
60%
70%
0%
10%
20%
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 110%
S up ply Air % of DesignS up ply Air % of Design
Page 66
D al Minim mDual Minimum
Minimum damper position is set proportionally based on fan speed p p y pbetween setpoints determined when the fan is at full speed and minimum speedp p
Low cost Affected by wind stack effect filter Affected by wind, stack effect, filter
loading
Page 67PG&E PEC Seminar Title 24 2008
Example Method of Dynamic OSA Control: Injection FanOSA Control: Injection Fan
Injection Fan w/ Discharge Damper
Outdoor Air Intake
Return Air
Page 68PG&E PEC Seminar Title 24 2008 Signal from SAT Controller
Return Air
Example Method of Dynamic OSA p yControl: Fixed Damper with DP control
∆P correlated to flow∆P correlated to flow for fixed orificeCan be 1 section or
entire OA damper
Outdoor Air Intake
Return Air
Page 69Spring 2006 Title 24 2005 Signal from SAT Controller
Test Proced re VAV S stemTest Procedure VAV System
1. Disable economizer (if applicable)2. Disable DCV (if applicable)3 Drive all boxes to minimum airflow
Setup
3. Drive all boxes to minimum airflow4. Measure and record OSA5. Drive all boxes to design airflow6 M d d OSA
Test 1
Test 2 6. Measure and record OSA7. Restore boxes, economizer and DCV controls
With DCV h t f th f ll i fl t t
Test 2
Clean up
With DCV you have to perform the full airflow test both with DCV disabled and DCV fully engaged. This is an example of how combining tests saves $$
Page 70PG&E PEC Seminar Title 24 2008
Test Proced re CV S stemTest Procedure CV System
1. Disable economizer (if applicable)2. Disable DCV (if applicable)3 Drive all boxes to minimum airflow
Setup
3. Drive all boxes to minimum airflow4. Measure and record OSA5. Drive all boxes to design airflow6 M d d OSA
Test 1
Test 2 6. Measure and record OSA7. Restore boxes, economizer and DCV controls
Test 2
Clean up
Page 71PG&E PEC Seminar Title 24 2008
Ho to Meas re OSAHow to Measure OSA
AFMS (if part of the system) Calibrated damper (if part of the system)p ( p y ) Traverse of OSA louver/duct Traverse of SA and RA ducts (differential)( ) For each test OSA must be +/-10% of design
Note on small packaged units you might haveNote on small packaged units you might have to provide a temporary sheet metal hood on the OSA intake to get a good reading
Page 72PG&E PEC Seminar Title 24 2008
Issues with Economizer and DCV
If either the economizer or DCV engage during the test your main OSA damper g y pwill open and over ventilate the system
Page 73PG&E PEC Seminar Title 24 2008
H t Di bl E iHow to Disable an Economizer
Drop high-limit control setpoint below current OA temperature or enthalpy (all controls), or
Raise OA temperature or enthalpy reading above high limit control setpoint (DDC controls), or
Disable economizer control block (DDC controls)
Page 74PG&E PEC Seminar Title 24 2008
How to Disable and Engageg gDCV Controls
Disable DCV– Raise CO2 setpoint significantly aboveRaise CO2 setpoint significantly above
current CO2 reading (all controls) Engage DCV Engage DCV
– Lower CO2 setpoint to lowest possible setpoint (all controls)setpoint (all controls)
Page 75PG&E PEC Seminar Title 24 2008
How to Drive VAV Boxes Open Set zone cooling temperature setpoint below
the current zone temperature (all controls) Override the VAV box airflow setpoint (DDC Override the VAV box airflow setpoint (DDC
controls) With DDC controls you might want to specify
t f ti t d i ll b t d ipreset functions to drive all boxes to design airflow and minimum airflow to speed up the testsNote if you override the VAV box damper you may provide more than the design maximum airflow
Page 76PG&E PEC Seminar Title 24 2008
airflow
How to Drive System to yMinimum Airflow
Set zone cooling temperature setpoint above the current zone temperature (all controls)
Override the VAV box control airflow setpoint (DDC controls, could be preset)
Manually slow down fan until airflow is ~30% of design airflow (all controls, requires AFMS or duct traverse)
Page 77PG&E PEC Seminar Title 24 2008
Project information(typical)
T h i iTechnician block(typical)
Reviewer block(typical)
Page 78PG&E PEC Seminar Title 24 2008
AH 1 2nd Floor Offices
Project XYC, Somewhere, California
Construction inspection (typical)
1 850
Testing block
1,9102 000
1,8502,0003 mins
(typical)2,0003.2 mins
92.5
Page 79PG&E PEC Seminar Title 24 2008 95.5
Project XYC, Somewhere, California
Test summary
AH 1 2nd Floor Offices
j C, S , C
(Typical)
Page 80PG&E PEC Seminar Title 24 2008
Packaged HVACPackaged HVAC ControlsControls
Package HVAC Controls gAcceptance Test
Page 82PG&E PEC Seminar Title 24 2008
P rposePurpose
Check thermostat, setpoints and scheduling controlsg
Verify that heating, economizer and cooling are properly sequencedcooling are properly sequenced
Verify operation in occupied and unoccupied modesunoccupied modes
Page 83PG&E PEC Seminar Title 24 2008
O er ieOverview
References– Standard Sections §122(a) to (h), §121(c)1 and
§125 (a)2§125 (a)2– Non-Residential Appendix NA 7.5.2 – Nonresidential Compliance Manual 10.6.6p
Scope– New controls on existing and new systems– Applies to packaged single zone AC units with
furnaces or heat pump heating only (per §125(a)2)
Page 84PG&E PEC Seminar Title 24 2008
Related TestsRelated Tests
NA 7.5.1.2 Constant Volume System Outdoor Air Acceptance
NA 7.5.4 (Air-Side) Economizer Acceptance NA 7.5.5 Demand Control Ventilation
Acceptance
Page 85PG&E PEC Seminar Title 24 2008
Constr ction InspectionConstruction Inspection
Page 86PG&E PEC Seminar Title 24 2008
Occ pied Mode Test Proced reOccupied Mode Test Procedure
1. Heating– Supply fan operates continuously– OSA is provided
No cooling occurs– No cooling occurs– Verify that all heating stages work
2. Dead Band– Supply fan operates continuouslypp y p y– OSA is provided– No heating or cooling occurs
3. CoolingS l f t ti l– Supply fan operates continuously
– OSA is provided– No heating occurs– Verify that all cooling stages work
Page 87PG&E PEC Seminar Title 24 2008
y g gNote the cooling test is repeated under economizer acceptance
How to drive the unit into heating, cooling or deadband Cooling
– Move thermostat cooling setpoint below the current room temperaturecurrent room temperature
Dead Band– Move the thermostat cooling setpoint above the
current room temperature andcurrent room temperature, and – Move the thermostat heating setpoint below the
current room temperatureH ti Heating– Move the thermostat heating setpoint above the
current room temperature
Page 88PG&E PEC Seminar Title 24 2008
U i d M d T t P dUnoccupied Mode Test Procedure
4. Heating– Supply fan cycles on with call for heating (and off when satisfied)– OSA is closed or cycles with supply fan
No cooling occurs– No cooling occurs5. Dead Band
– Supply fan is off– OSA damper is closedp– No heating or cooling occurs
6. Cooling– Supply fan cycles on with call for cooling (and off when satisfied)
OSA i l d l ith l f– OSA is closed or cycles with supply fan– No heating occurs
Page 89PG&E PEC Seminar Title 24 2008
Again, the cooling test is repeated under economizer acceptance
How to move the unit into the “unoccupied” mode
Adjust the schedule so that the unit is scheduled off at the current time, or,
Reset the current time so that it is outside of the scheduled occupiedoutside of the scheduled occupied period
Page 90PG&E PEC Seminar Title 24 2008
O erride Mode Test Proced reOverride Mode Test Procedure
7. Enable after hours override– System goes to “occupied” modeSystem goes to occupied mode– System returns to “unoccupied” mode after
timed delayy8. Return system to normal operation
– Reset all setpoints– Reset all setpoints– Remove any jumpers
Page 91PG&E PEC Seminar Title 24 2008
How to activate the after-hours override
Put the unit into “unoccupied” mode (see previous slide)( p )
Push the after-hours button on the thermostatthermostat
Page 92PG&E PEC Seminar Title 24 2008
Page 93PG&E PEC Seminar Title 24 2008
Page 94PG&E PEC Seminar Title 24 2008
Page 95PG&E PEC Seminar Title 24 2008
LunchLunch
DCVDCV
DCV Ch (121( )3 d 4)DCV Changes (121(c)3 and 4)
Extended to multiple zone for systems with DDC to the zone level
Exceptions added for beauty salons call centers Exceptions added for beauty salons, call centers, healthcare facilities, medical buildings, and public areas of social services buildings.E ti f <150 f ith <10 l Exception for zones <150 sf or with <10 people
Multiple sensors required for spaces >10,000 ft2 Tighter accuracy requirements for CO2 sensorsg y q Safe mode for sensor failure Display and recording of CO2 levels for DDC
systems may be at EMCSPage 98Slide 98
systems – may be at EMCS
Demand Control Ventilation Requirements (§121(c)3)DCV is required when:
– Unit has an air side economizer (single or multiple zone unit)(single or multiple zone unit)
– Zone occupant exiting density is ≤40 sf/person
Page 99PG&E PEC Seminar Title 24 2008
DCV E ceptionsDCV Exceptions
Page 100PG&E PEC Seminar Title 24 2008
DCV <= 40 ft2/person (egress)
Page 101PG&E PEC Seminar Title 24 2008
Demand Control Ventilation Requirements (§121(c)4) Where DCV is applied, it must meet the following:
– One sensor for each space that meets the criteria of 121(c)3B121(c)3B
– Sensor must be CO2– Sensor must be located in the breathing zone between 3’
and 6’ AFF or at the anticipated level of the occupant’sand 6’ AFF or at the anticipated level of the occupant’s heads
– Maintain setpoint of 600ppm + OSA ppm400 PPM d f lt• 400 PPM default or
• dynamically measured
Page 102PG&E PEC Seminar Title 24 2008
Demand Control Ventilation Requirements (§121(c)4)
Where DCV is applied, it must meet the following:– No greater than design ventilation @ 15
cfm/personNo less than ventilation from Table 121 A (cfm/ft2)– No less than ventilation from Table 121-A (cfm/ft2)
– Design ventilation for spaces without DCV
Page 103PG&E PEC Seminar Title 24 2008
Demand Control Ventilation Requirements (§121(c)4)
Based on testing from Iowa Energy Centersee: http://www.energy.iastate.edu/Efficiency/Commercial/nbcip.htm
Page 104PG&E PEC Seminar Title 24 2008
Can This be Done?Can This be Done?
Honeywell W7212 does all of this (SZ controller))
Others may have products as well These provisions can also be done with These provisions can also be done with
DDC controls
Page 105PG&E PEC Seminar Title 24 2008
Do Ret rn CO2 Sensors Work?Do Return CO2 Sensors Work?
Return is diluted by otherReturn is diluted by otherZones and does not track the critical zone
Page 106PG&E PEC Seminar Title 24 2008
DCV Acceptance TestDCV Acceptance Test
Page 107PG&E PEC Seminar Title 24 2008
P rposePurpose
Check DCV calibration and installation Test DCV at: Test DCV at:
– High CO2 levelsLow CO2 levels– Low CO2 levels
Page 108PG&E PEC Seminar Title 24 2008
O er ieOverview
References– Standard Sections §121(c)3, §121(c)4 andStandard Sections §121(c)3, §121(c)4 and
§125(a)5– Non Residential Appendix NA 7.5.5pp– Nonresidential Compliance Manual 10.6.12
Scope Scope– Code required DCV systems
Page 109PG&E PEC Seminar Title 24 2008
Related TestsRelated Tests
NA 7.5.1 Outdoor Air Acceptance NA 7 5 4 (Air-Side) Economizer NA 7.5.4 (Air Side) Economizer
Acceptance This test should be combined withThis test should be combined with minimum OSA and economizer acceptance tests to reduce time andacceptance tests to reduce time and costs
Page 110PG&E PEC Seminar Title 24 2008
Constr ction InspectionConstruction Inspection
Page 111PG&E PEC Seminar Title 24 2008
T t P dTest Procedure
Step 5 was put in to resolve CalOSHA comments but is not in the forms
Page 112PG&E PEC Seminar Title 24 2008
Step 5 was put in to resolve CalOSHA comments but is not in the forms
O idi CO2 C t lOverriding CO2 Controls
To simulate high demand you need to decrease the sensor setpointp
To simulate low demand you need to increase the sensor setpointincrease the sensor setpoint
You can also use calibrated gas
Page 113PG&E PEC Seminar Title 24 2008
Page 114PG&E PEC Seminar Title 24 2008
Default is 400 ppm
Page 115PG&E PEC Seminar Title 24 2008
Air-SideAir Side EconomizerEconomizer
Air side economi erAir-side economizer
65FT
Modulating
95F
Min. Vent
T T
90FT
VS RELIEF FAN
Air side economi erAir-side economizer
TClosed 65F
T T65F
T 90F
Closed
VS RELIEF FAN
Air side economi erAir-side economizer
TClosed 65F
T T35F
T 90F
VS RELIEF FAN
Ai id i l tAir side economizer elements Dampers
– OSA– RA
Temperature sensors Temperature sensors– SAT– RAT– OAT
High limit switch Minimum position control (ventilation) Minimum position control (ventilation) Space pressure control
– Barometric or powered
Page 120
p
PG&E PEC Seminar Title 24 2008
Airside EconomizerAcceptance Test
Page 121PG&E PEC Seminar Title 24 2008
P rposePurpose
Check economizer installation and provision for exhaust or reliefp
Test economizer operation
Page 122PG&E PEC Seminar Title 24 2008
O er ieOverview
References– Standard Sections §144(e) and §125(a)4– Non-Residential Appendix NA 7.5.4 – Nonresidential Compliance Manual 10.6.10
Scope– All new systems with air-side economizers
N t ti i d if i i f t– No testing required if economizer is factory installed and certified operational
Page 123PG&E PEC Seminar Title 24 2008
B R i t i Titl 24Base Requirement in Title 24
§144(e) Economizers. Each individual cooling fan system that has a design supply capacity over 2,500 cfm and a total mechanical cooling capacity over 75 000 Bt /h h ll i l d ith75,000 Btu/hr. shall include either:– An air economizer capable of modulating outside-air and
return-air dampers to supply 100 percent of the design supply air quantity as outside-air; orsupply air quantity as outside air; or
– A water economizer … [Be] capable of providing partial cooling even when
additional mechanical cooling is required to meet the g qremainder of the cooling load.
Air-side economizers shall have high limit shutoff controls complying with TABLE 144-C.
Page 124PG&E PEC Seminar Title 24 2008
p y g
High Limit Switch
Iowa Energy Center is testing high limit switches
Page 125PG&E PEC Seminar Title 24 2008
see: http://www.energy.iastate.edu/Efficiency/Commercial/nbcip.htm
Related TestsRelated Tests
NA 7.5.1 Outdoor Air Acceptance NA 7.5.5 Demand Control Ventilation
A tAcceptance
Thi t t h ld b bi d ith i iThis test should be combined with minimum OSA to reduce time and costs
Page 126PG&E PEC Seminar Title 24 2008
Constr ction InspectionConstruction Inspection
Page 127PG&E PEC Seminar Title 24 2008
T t P dTest Procedure
Page 128PG&E PEC Seminar Title 24 2008
Page 129PG&E PEC Seminar Title 24 2008
Page 130PG&E PEC Seminar Title 24 2008
BreakBreak
DuctsDucts
Duct Sealing New ConstructionDuct Sealing New Construction(§144(k) & Appendix NA2)
Applies to – Constant volume single zone heating or cooling
unitsunits– Serving <5,000 sf– Where >25% duct area in outdoors and
uninsulated (or vented) atticsuninsulated (or vented) attics Leakage testing
– Leakage must be ≤6% of supply flow– Measured at 25 Pa (0.1” H2O)– Testing must be verified by a 3rd party CEC
certified rater (HERS) [details later]
Page 133PG&E PEC Seminar Title 24 2008
Duct Sealing on RetrofitsDuct Sealing on Retrofits(§144(k), 149(b)1D/E & Appendix NA2)
Applies to retrofit when – Previous tests apply (e.g. <5000 ft2…)– Ductwork is replaced (in part or in whole)– Heating or cooling units are replaced– Replacement of major unit components including:
• Fans• Coils • Furnaces• Outdoor condensing units!
Page 134PG&E PEC Seminar Title 24 2008
Duct Sealing on RetrofitsDuct Sealing on Retrofits(§144(k), 149(b)1D/E & Appendix NA2)
New duct leakage – ≤6%
Existing duct leakage Existing duct leakage– ≤15% of supply– >60% reduction in leakage with all visible leaks
l dsealed– Can’t get at the ducts and all visible leaks are
sealed as certified by a HERS rater Exceptions
– Asbestos– Existing ducts that were previously certified
Page 135PG&E PEC Seminar Title 24 2008
Existing ducts that were previously certified
Tests b a ContractorTests by a Contractor
Independent HERS rater must do all of the following:– Verify the first system tested– Verify the first system tested– Verify one out of the each group of 7 tested
• If that unit fails the test, • test a second unit in the group of 7• test a second unit in the group of 7• if that fails test the other 5 in the group of 7
– Certify ALL of the tests made by the contractorEnter all tests into the HERS database– Enter all tests into the HERS database
New groups of 7 applies to each new construction project (but not for retrofit)
Page 136PG&E PEC Seminar Title 24 2008
Duct LeakagegAcceptance Test
Page 137PG&E PEC Seminar Title 24 2008
P rposePurpose
Check duct insulation and installation Verify duct leakage Verify duct leakage
Page 138PG&E PEC Seminar Title 24 2008
O er ieOverview
References– Standard Sections §124, §125(a)3, §144(k) and
§149(b)1D§149(b)1D– Non-Residential Appendix NA 7.5.3– Nonresidential Compliance Manual 10.6.8p
Scope– Single zone systems serving small spaces with
i ifi t d t k td i diti dsignificant ductwork outdoors or in unconditioned spaces
– New construction and retrofits of existing units or
Page 139PG&E PEC Seminar Title 24 2008
ducts
Related TestsRelated Tests
None
Page 140PG&E PEC Seminar Title 24 2008
Constr ction InspectionConstruction Inspection
Page 141PG&E PEC Seminar Title 24 2008
T t P dTest Procedure Must be done before ductwork is concealed Leakage tests may be done by the contractor
but must be verified by a HERS rater as yshown previously
Page 142PG&E PEC Seminar Title 24 2008
Page 143PG&E PEC Seminar Title 24 2008
Page 144PG&E PEC Seminar Title 24 2008
Page 145PG&E PEC Seminar Title 24 2008
Airside MeasuresAirside Measures
VAV Fan Capacity Control p y(§144(c)2B)
VSDs (or equivalent control) required for VAV fans (≥10 hp)
Equivalent defined as ≤30% power at 50% airflow with static pressure setpoint at 1/3 d i t tidesign static pressure
Page 147PG&E PEC Seminar Title 24 2008
The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again.
VAV F C it C t l (§144( )2B)VAV Fan Capacity Control (§144(c)2B)
XXX
XX
XXX
X
Page 148
Static Pressure Controls (§144(c)2C/D)
For systems without DDC zone controls– Locate pressure sensor so that control setpoint
is ≤1/3 SPdesign
For systems with DDC zone controls– Provide pressure reset by zone demand
• Either from damper feedback or through trim and respond
– Sensor placement is not important
Control details are in the PIER VAV Design Guide and
Page 149PG&E PEC Seminar Title 24 2008
Title 24 NR Manual
Static Pressure Controls (§144(c)2C/D)
Return Air Supply Air F DDC
Outside
Mixed Air (MA)
(RA)pp y
(SA)
Exhaust Ai
For non-DDC controls, locate pressure sensor where setpoint is
Air (OA)
Air (OA)
p1/3 of SP across fan
Page 150PG&E PEC Seminar Title 24 2008
St ti P C t l (§144( )2C/D)Static Pressure Controls (§144(c)2C/D) 100%
70%
80%
90%
50%
60%
70%
cent
Fan
kW SP setpoint = TSP
SP setpoint = TSP*.75SP setpoint = TSP/2SP setpoint = TSP/3
Increa
Non-DDC
20%
30%
40%Per
c SP setpoint TSP/3SP setpoint = 0
asing ene
Non-DDC
DDC
0%
10%
20%
0
0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
ergy
Page 151PG&E PEC Seminar Title 24 2008
10 20 30 40 50 60 70 80 90 100
Percent Fan CFM
St ti P C t l (§144( )2C/D)Static Pressure Controls (§144(c)2C/D) No Static Pressure ResetPerfect Static Pressure Reset
$3,602
$3,057$3,246 $3,171
$2,998
$3,555
$3 000
$3,500
$4,000
$0.1
2/kw
h)
Perfect Static Pressure Reset
~20%
$
$2,000
$2,500
$3,000
ergy
Cos
t (at
$
~66%
$1,254 $1,266 $1,231 $1,232 $1,250 $1,248
$500
$1,000
$1,500
nnua
l Fan
Ene
$-60" PlenumFan (3.5"
Design SP)(62 4%)
60" BI(71.2%)
66" BI(75.5%)
49" AF(75.4%)
44.5" AF(73.0%)
54" MixedFlow
(73.4%)
An
Page 152PG&E PEC Seminar Title 24 2008
(62.4%)Case study from the PIER VAV Design Guide
VAV SystemyAcceptance Test
Page 153PG&E PEC Seminar Title 24 2008
P rposePurpose
Check calibration and setpoint of pressure sensor for VAV systemsp y
Check stability of control on VAV systems at full and part loadsystems at full and part load
Page 154PG&E PEC Seminar Title 24 2008
O er ieOverview
References– Standard Sections §144(c)2B and §125(a)6– Non-Residential Appendix 7.5.6– Nonresidential Compliance Manual 10.6.14
Scope– New VAV fans greater than or equal to 10 hp
B th i ti d f h– Both prescriptive and performance approach
Page 155PG&E PEC Seminar Title 24 2008
Related TestsRelated Tests
NA7.5.1.1 Variable Air Volume Systems Outdoor Air Acceptancep
This test should be combined withThis test should be combined with minimum OSA test to reduce time and costscosts
Page 156PG&E PEC Seminar Title 24 2008
Constr ction InspectionConstruction Inspection
Page 157PG&E PEC Seminar Title 24 2008
T t P dTest Procedure
You may have to disable SA temperature reset during this test to prevent unwanted flow fluctuationsfluctuations1. Drive boxes to achieve design airflow (refer
to min OSA test for how to do this)to min OSA test for how to do this)2. Record measured SP (must be +/- 10% of
setpoint)3. Note if fan speed stabilizes within 5 minutes
Page 158PG&E PEC Seminar Title 24 2008
T t P dTest Procedure
4. Drive boxes to achieve minimum airflow (refer to min OSA test for how to do this)
5. Record measured duct static pressure (must be +/- 10% of setpoint)
6. Note if fan speed stabilizes within 5 minutes
Page 159PG&E PEC Seminar Title 24 2008
O idi VAV bOverriding VAV boxes
Covered earlier under the discussion of minimum OSA testing for VAV systemsg y
Page 160PG&E PEC Seminar Title 24 2008
Page 161PG&E PEC Seminar Title 24 2008
Page 162PG&E PEC Seminar Title 24 2008
BreakBreak
Automatic Demand Shed Controls
Page 164PG&E PEC Seminar Title 24 2008
Automatic Demand Shed Controls (122(h)) All
New!
For systems with DDC to the zone:– Ability to reset thermostat setpoint up to 4°F on all “non-
critical” zones through real or virtual DIcritical zones through real or virtual DI. – System needs an adjustable rate of change for reset
Shown by LBNL and Purdue to reduce on-peak demand by over 30%.
Supported by ASHRAE Standard 55(Table 5 2 5 2)(Table 5.2.5.2).
6 0°F 5 0°F 4 0°F 3 0°F 2 0°F Maximum Operative T t Ch All d
4 h 2 h 1 h 1/2 h 1/4 h Time Period
6 0°F 5 0°F 4 0°F 3 0°F 2 0°F Maximum Operative T t Ch All d
4 h 2 h 1 h 1/2 h 1/4 h Time Period
Page 165Slide 165
6.0°F 5.0°F 4.0°F 3.0°F 2.0°F Temperature Change Allowed 6.0°F 5.0°F 4.0°F 3.0°F 2.0°F Temperature Change Allowed
Santa Rosa Federal BuildingPink line has precoolingRed line starts on normal schedule
Santa Rosa Federal Building (LBNL)Extended Precooling (Hot days )( )
5
r
Extended precooling 1 Extended precooling 2 baseline
3
4
ldin
g po
wer
W/s
qft 2.3 W/sf shed
1
2
Who
le B
uil W
00 2 4 6 8 10 12 14 16 18 20 22 24
Time (hour)
W
Page 166
( )
O er ieOverview
References– Standard Sections §122(b)4, §122(h) and
§125(a)10– Non-Residential Appendix NA 7.5.10– Nonresidential Compliance Manual 10.6.19
Scope– New DDC Zone Controls
Page 167PG&E PEC Seminar Title 24 2008
Related TestsRelated Tests
None
Page 168PG&E PEC Seminar Title 24 2008
P rposePurpose
To make sure that the demand shed controls are programmed and work p gwhen engaged
Page 169PG&E PEC Seminar Title 24 2008
Constr ction InspectionConstruction Inspection
Page 170PG&E PEC Seminar Title 24 2008
T t P dTest Procedure
Page 171PG&E PEC Seminar Title 24 2008
Page 172PG&E PEC Seminar Title 24 2008
Page 173PG&E PEC Seminar Title 24 2008
B d S f T dBeyond Scope for Today
ACM Section and Test Standard SectionNA 7.5.1.11 FDD for Packaged DX Systems 125(a)11
NA 7.5.1.12 FDD for AHUS and Zone Terminal Units 125(a)12
NA 7 5 1 13 Distributed Energy Storage DX AC Systems 125(a)13NA 7.5.1.13 Distributed Energy Storage DX AC Systems 125(a)13
NA 7.5.1.14 Thermal Energy Storage Systems 125(a)14
These tests are documented in the Non-Residential Appendices and Non-Residential Compliance Manual They are only required when you seek aManual. They are only required when you seek a compliance credit.
Page 174PG&E PEC Seminar Title 24 2008
Hydronic MeasuresHydronic Measures
Variable FlowVariable Flow Controls (Hydronic)Controls (Hydronic)
Variable Flow Design (§144(j)1)(§144(j)1)
CHW/HW systems (§144(j)1) – Where >3 control valvesWhere 3 control valves – Must reduce flow to the larger of
• 50% design flow g• The minimum flow required for the equipment
Page 177PG&E PEC Seminar Title 24 2008
Variable Speed Drives p(§144(j)6) Where pumps are >5 hp Must be VFD or equivalent
– ≤30% power at 50% flow
For systems without DDC to the zone pressure sensor shall be mounted at eithersensor shall be mounted at either– The most remote coil or HX– The coil or HX requiring the largest DP
F t ith DDC t th d d b d For system with DDC to the zone demand based pressure reset (based on valve demand) is required
Exception for HW pumps
New
Page 178PG&E PEC Seminar Title 24 2008
Exception for HW pumps
Variable Flow DesigngAcceptance Tests
NA 7.5.7 Valve Leakage TestTest
NA 7.5.9 Hydronic System Variable Flow ControlVariable Flow Control Acceptance
Page 179PG&E PEC Seminar Title 24 2008
P rposePurpose
Make sure that the system has 2-way valves to provide variable flowp
Ensure that the valves operate to provide flow variationsprovide flow variations
Ensure that the valve actuators have sufficient strength to close off againstsufficient strength to close off against the pump pressure
Page 180PG&E PEC Seminar Title 24 2008
O er ieOverview
References– Standard Sections §144(j)1, §144(j)6 and
§125(a)7– Non-Residential Appendix NA 7.5.7 and 7.5.9
Nonresidential Compliance Manual 10 6 16 and– Nonresidential Compliance Manual 10.6.16 and 10.6.18
Scope Scope– New valves on hot and chilled water systems– New pumps on existing variable flow systems
Page 181PG&E PEC Seminar Title 24 2008
p p g y
Test for Valve Actuator Close Off Pressure Test is to “dead head” the distribution pump
with all valves closed tight. Leakage is detected if the measured pressure is lessdetected if the measured pressure is less than the dead head pressure for the pump.– Note: 3-way valves need to be manually isolated y y
for this test
Page 182PG&E PEC Seminar Title 24 2008
E ample P mp C r eExample Pump CurveFor a 10” impellor the “dead head” pressure is 104 ft of w.c.
Page 183PG&E PEC Seminar Title 24 2008
Related TestsRelated Tests
NA 7.5.9 Hydronic System Variable Flow Control Acceptancep
Page 184PG&E PEC Seminar Title 24 2008
Constr ction InspectionConstruction Inspection
Page 185PG&E PEC Seminar Title 24 2008
T t P dTest Procedure
1. Dead head the pump by shutting the discharge isolation valve Record the pressure across the pump
2. Dead head the pump again by driving all 2-way valves shut (and manually isolating any 3 way valves) Record the pressure across the pump
3. Compare pressure readings, if more than 5% difference find and fix the leakage
4. Restore any overrides of controls
Page 186PG&E PEC Seminar Title 24 2008
O idi V lOverriding Valves
On pneumatic systems you may be able to bleed the air from the zones
On other control systems you can drop the heating setpoint below the current t t ( it f li )temperature (opposite for cooling)
On DDC systems you can command the l t h tvalve to shut
Page 187PG&E PEC Seminar Title 24 2008
Page 188PG&E PEC Seminar Title 24 2008
Page 189PG&E PEC Seminar Title 24 2008
Variable FlowVariable Flow ControlsControls
Pump
VSD
Constr ction Inspection VSD
Pump
Construction Inspection
Page 191PG&E PEC Seminar Title 24 2008
T t P d VSD
Pump
Test Procedure
Page 192PG&E PEC Seminar Title 24 2008
O idi V l VSD
Pump
Overriding Valves
See previous section on valve leakage test
Page 193PG&E PEC Seminar Title 24 2008
VSD
Pump
Page 194PG&E PEC Seminar Title 24 2008
VSD
Pump
Page 195PG&E PEC Seminar Title 24 2008
VSD
Pump
Page 196PG&E PEC Seminar Title 24 2008
Water-Loop HP andWater Loop HP and AC ControlsAC Controls
WLHP/AC Variable Flow(§144(j)5)(§144(j)5)
New
Water-loop heat pump and AC systems (§144(j)5)(§ (j) )– Where total loop pumps > 5 hp – Must have isolation valves at each heatMust have isolation valves at each heat
pump or AC unit regardless of size
Page 198PG&E PEC Seminar Title 24 2008
WLHP/AC Variable Flow DesigngAcceptance Test
Repeat variable flow NA 7.5.9 and valve shut off tests NA 7.5.7 from previous sectionsection
Page 199PG&E PEC Seminar Title 24 2008
Overriding AC and HP Control gValves
Open valves by causing HP or AC units into full cooling or heating (for HPs) by changing setpoint
Close valve by putting all HP or AC units into d d b d (b h i t i t)dead band (by changing setpoint)
Page 200PG&E PEC Seminar Title 24 2008
Automatic IsolationAutomatic Isolation ControlsControls
Chiller and Boiler Isolation (§144(j)3)(§144(j)3)
Where chillers or boilers are headered you must provide automated isolation valves
Doesn’t apply to series chillersMust have an actuator
Page 202PG&E PEC Seminar Title 24 2008
O er ieOverview
References– Standard Sections §144(j)2 and §125(a)8Standard Sections §144(j)2 and §125(a)8– Non-Residential Appendix 7.5.7– Nonresidential Compliance Manual 10 6 16Nonresidential Compliance Manual 10.6.16
ScopeNew chillers and boilers with headered– New chillers and boilers with headered pumps
Page 203PG&E PEC Seminar Title 24 2008
Chiller and Boiler Isolation Acceptance Test
This is a repeat of the valve leakage test NA7.5.7
Page 204PG&E PEC Seminar Title 24 2008
Supply Water ResetSupply Water Reset ControlsControls
CHW and HW Temperature Reset p(§144(j)4)
Where the system is > 500,000 Btuh By demand or indirect measure (e.g. OAT)y ( g ) Exception where variable flow design
complying with (§144(j)1) – Supply temperature reset increases pump energy
Page 206PG&E PEC Seminar Title 24 2008
CHW and HW Temperature pReset Acceptance Test
Page 207PG&E PEC Seminar Title 24 2008
O er ieOverview
References– Standard Sections §144(j)4 and §125(a)9
N R id ti l A di NA 7 5 8– Non-Residential Appendix NA 7.5.8– Nonresidential Compliance Manual 10.6.17
Scope Scope– New constant flow chilled and hot water systems
only– Must have design capacity over 500kBtuh– Not required if system is variable flow per §144(j)1
Page 208PG&E PEC Seminar Title 24 2008
Related TestsRelated Tests
None
Page 209PG&E PEC Seminar Title 24 2008
P rposePurpose
To make sure that the reset logic works if installed
Page 210PG&E PEC Seminar Title 24 2008
Constr ction InspectionConstruction Inspection
Page 211PG&E PEC Seminar Title 24 2008
T t P dTest Procedure
Page 212PG&E PEC Seminar Title 24 2008
O idi R tOverriding Reset
If the reset is by valve position, force one valve into full demand by– Changing the SAT setpoint to drive it open– Overriding it in the DDC system
If reset is by OSA– Override value in DDC system
Page 213PG&E PEC Seminar Title 24 2008
Page 214PG&E PEC Seminar Title 24 2008
Should say, “Restore Controls”
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Q estionsQuestions
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