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Diagnostic and Combustion Safety Form Directions
Pre-weatherization information should be documented in the shaded boxes. Post-weatherization information should
be documented in the non-shaded boxes.
Page 2: Combustion Safety Testing
Make sure the information section at the top of page one, is completed. Include agency name, testers, and dates
tested.
Building DTL and CAZ Pressure Differentials (top left side of the page).
Pre-WX Delta P. These tests document the existing condition of the building, prior to weatherization
work. They help to determine the measures needed for the safe operation of combustion appliances in
the building.
1) Baseline Depressurization. Measure and record Building DTL and CAZ Pressure Differentials
Pre-WX Post-WX
the pressure difference (Delta P) between the Delta P Delta P
Combustion Appliance Zone (CAZ) and the outside. Baseline Depressurization
2) Turn on Exhaust Appliances. Turn on all of the (Interior doors open, CAZ door closed,
exhaust appliances in the building, measure, and exhaust appliances off, record pressure)
record pressure. A negative reading larger than Step 1) Turn on All Exhaust Appliances in the
Baseline usually means the exhaust fans depressurize Building
the CAZ. (Record Pressure)
Forced Air Distribution Impact on Delta P
3) Turn on the Air Handler. Measure and record
pressure difference (Delta P). A negative reading larger Turn On Furnace Air
(Record Pressure)
than Step 2) exhaust fans, usually means the return
ducts depressurize the CAZ. A positive reading usually Position Interior
(Smoke door; if smoke drawn into room open door, if smoke pushed
means there are supply ducts pressurizing the CAZ. out or neutral, close door. Record Pressure)
Determine distribution sealing needs based on this
reading and other diagnostic tests (when needed).
Open Door to CAZ
(Record Pressure)
4) Position Interior Doors. Use a smoke product
device and smoke each of the interior doors to
Worst Case Depressurization
determine whether to open or close the doors. If smoke Adjusted for Baseline:DG3-subtract baseline; DG700-use the baseline
is drawn into the room, open the door. If smoke is feature to adjust
(Use Post for 'As Is' Worst
(Use Pre for 'As Is' Worst
pushed out of the room or is neutral, close door. Case Case
Measure, and record pressure difference (Delta P). A negative reading, larger than Step 3) air handler, usually
means there are not enough return ducts in the living area. Determine distribution modifications based on this
reading nd other diagnostic tests (when needed).
5) Open the door to the CAZ. Measure and record pressure difference (Delta P). A negative reading larger than
Step 4) Position Interior Doors, usually means the exhaust fans depressurize the CAZ.
6) Worst Case Depressurization. Subtract the Baseline reading from the largest negative reading obtained to get
the adjusted Worst Case Depressurization. Use this figure on page 1, Depressurization Limits Section, when
comparing the guidelines to the actual readings.
Post Weatherization Building DTL and CAZ Pressure Differentials
Post-WX Delta P. These tests document the final condition of the building when weatherization work is completed.
They help determine that the combustion appliances in the building are operating safely.
• Repeat Step 1) through Step 6) above, after all planned work is completed.
Pre Weatherization Draft, Spillage, and CO Measurements
These tests document the existing condition of the appliances. They are conducted under the Pre-Worst Case
Depressurization conditions (above). Take the draft test in the flue(s). Take the carbon monoxide test before the
appliance draft divertor or barometric damper. See the Set-up and Guideline worksheet for additional setup
information. Always cycle the atmospheric combustion appliance with the lowest BTU output first.
• Cycle Water Heater. Take draft reading at 3 minutes. Test for spillage using a smoke device. Measure the CO
PPM in the flue. The unit passes if the draft reading is acceptable for the fuel type and outside temperature (see the
Set-up and Guideline worksheet), there is no spillage, and CO level in flue are less 100 PPM.
• Cycle Furnace. Take draft reading at 3 minutes for gas, 10 minutes for oil. Test for spillage using a smoke
device. Measure the CO PPM in the flue. The unit passes if the draft reading is acceptable for the fuel type and
outside temperature (see the Set-up and Guideline worksheet), there is no spillage, and CO level in flue are less
• Repeat these steps for other appliances.
• Document any important circumstances.
• Failed appliances must have problem resolved prior to the completion of the weatherization work.
WI Division of Energy-EAB
Page 1 12/8/04
Page 2: Combustion Safety Testing Continued
Post Weatherization Draft, Spillage, and CO Measurements
These tests document the post-weatherization condition of the appliances. They are conducted under the Post-
Worst Case Depressurization conditions.
• Repeat the steps outlined above when all other weatherization work has been completed.
Gas Range CO Testing Results
These tests document the existing condition of the gas range prior to any weatherization work and the operation of
the range when the weatherizaton work is completed. See the Set-up and Guideline worksheet for guideline and
action level information. Follow Recommended Best Practices for Carbon Monoxide Testing of Gas Ranges
(Weatherization Manual).
• Measure ambient CO level outside of building or unit. Measure ambient CO level inside of building or unit.
Subtract outside reading from inside reading to determine the magnitude of any CO problem found within unit.
• Visually inspect the appliance. If unit has broken parts, pilot burning wrong, warped deflectors and is not
repairable unit should be to be replaced. Range top burners and oven MUST NOT BE DIRTY to the extent that it
will cause false CO readings. Customer should be informed to clean the unit before any testing can be done.
Testing Range Top Burners (as measured in ambient air without
Pre-WX Gas Range CO Testing adjustment for oxygen content).
Right 1. Remove all pots and foil from the burner area.
Left Rear
PPM Rear PPM 2. Turn all range top burners on high and allow to warm.
Burner
3. Test 6” above the flame without pots or test fixtures.
Left Front Right
Burner PPM PPM 4. Record reading (3 minutes).
Front
Oven Testing Range Ovens ( must be tested air free with
PPM air free adjustment for oxygen content)
1. Test ranges and ovens after all other vented appliances
Post-WX Gas Range CO Testing
have been tested
Left Rear Right 2. Remove any items stored in the oven and any foil coverings
PPM PPM before proceeding.
Burner Rear
Left Front Right 3. Assure that self cleaning features are not activated.
PPM PPM
Burner Front 4. Insert the instrument probe into the vent sleeve before
dilution air mixes with combustion by-products
Oven
PPM air free 5. Measure oven during warm-up and record peak (10 minutes)
Note: When testing ranges, continually monitor ambient space around oven during testing to protect
inspector and customer. Retest ambient air to ensure no change in CO from initial tests.
WI Division of Energy-EAB
Page 2 12/8/04
Diagnostic and Combustion Safety Form Directions
Pre-weatherization information should be documented in the shaded boxes. Post-weatherization information
should be documented in the non-shaded boxes.
Page 1: Diagnostic Testing and Modeling
Fill in the information section at the top of page one, include agency name, testers, and dates tested.
Building Tight Limits Section (BTLa) (middle left side of the page).
Building Tightness Limits (BTLa)
As Is Test Final Test
• As Is Test. Document the As Is blower door test in the top
House CaaFM50
shaded box.
• Use the ZipTestPro (BTLa) to determine building tightness limits.
Building Height (ft)
Flow Exponent Follow the directions in the ZipTestPro manual (pages 8-10). Enter
(Default .65)
the building information and the modeling results in the shaded
Story Height (ft)
Weather Factor boxed.
Note that the ventilation BTLa calls for does not include the
# People
House Volume (cu ft)
# Bedrooms existing ventilation in the building. The existing ventilation should
House Floor (sq ft)
Occupant Count be assessed for capacity (CFM Exhaust Appliances) and utilized,
(larger of # of people or # of bedrooms+1)
where feasible, for all or part of the ventilation requirement.
Building Tightness Limit (BTLa:CFM50) • Final Test. Document the Final blower test in the top non-
As Is Est Final
shaded box.
Continuous Ventilation Needed
(BTLa cfm) • Rerun BTLa with the final blower door test to determine if
additional ventilation is needed.
Depressurization Limits (DTL) (middle right side of the page).
Pre Modeling for Minimum Allowable CFM50 Pre Modeling for Maximum Allowable
• Enter the total pre Depressurizaton Limits (DTL) CFM Exhaust
cfm of the exhaust Pre Final • Enter the total pre cfm50 test
Total Exhaust cfm
appliances (as (As Measured or Estimate) of the building in the top shaded
measured or Maximum Delta P • Enter the maximum Delta P for
(Bldg Dep Guideline
estimate) in the top Chart) the building, based the existing
shaded box. Flow Exponent combustion appliances, from the
• Enter the maximum (Default .65)
Depressurization Guideline
Solve for DTL (cfm50 )
Delta P for the Chart (see Setup & Guidelines
Pre Final
building, based the for Testing worksheet) in the
existing combustion House CFM50 second shaded box.
appliances, from the Maximum Delta P
(Bldg Dep Guideline • Enter the Flow Exponent. Use
Depressurization Chart)
either the default (.65) or the
Solve for Total Exhaust
Guideline Chart (see (cfm) actual exponent from a five-
Setup & Guidelines point blower door test.
for Testing Worst Case Delta P* • Solve for maximum allowable
*record the max. ?P from Pre-WCD *record the max. ?P from Post-WCD
worksheet) in the adjusted for baseline ( page 2) adjusted for baseline ( page 2) CFM of the exhaust appliances.
second shaded box. Use the ZipTestPro
• Enter the Flow Exponent. Use either default (.65) or actual Software(DTL) to determine
exponent from a five-point blower door test. building depressurized
• Solve for minimum allowable cfm50 blower door test. requirements. Follow the
Use the ZipTestPro Software (DTL) to determine depressurized building directions in the ZipTestPro
requirements. Follow the directions in the ZipTestPro manual (pages 8-10). manual (pages 8-10)
• Enter the pre Worst Case
Depressurization of the building
Post Modeling for Minimum Allowable CFM50 and CFM Exhaust (page two).*
• Repeat the steps listed above for pre-modeling, with the final test results.
• Enter the post Worst Case Depressurization of the building (from page two).
*If the Worst Case Depressurization is greater than the maximum Delta P for the building, based on the
Depressurization Guideline Chart, the problem must be solved prior to completing the weatherization work. The
building may require additional returns, distribution sealing, a change of venting or combustion appliances, or
added make-up air.
WI Division of Energy-EAB
Page 3 12/8/04
Page 1: Diagnostic Testing and Modeling Continued
Results: Blower Door Tests and Sealing Work Section (bottom left corner of the page).
• As Is Test. Document the As Is blower door test in the top shaded box. Complete this blower door test prior to
any work on dwelling. This test documents existing conditions and allows for the modeling of building tightness.
It also helps determine if non-guideline sealing is needed in order to run an accurate blower door test. Examples
of non-guideline sealing include installing window where missing, sealing gross holes in the building envelope,
and sealing key junctures.
• Pre-Test. Document the Pre blower door test in the second box. Complete this test after any non-guideline
sealing work is completed. If no non-guideline sealing is needed the “as is” and “pre” may be the same test.
Document any cfm reductions and work
Results: Blower Door Tests and Sealing Work
hours for non-guideline sealing. cfm@ 50 Work Hours
Non-Guideline
• Final Test. Document the Final blower CFM 50 of Building
(As Is Test)
Reduction
(As Is Test- Pre Test)
door test in the third box. Document any CFM 50 of Building Guideline Reduction
cfm reductions and work hrs. for guideline (Pre Test) (Pre Test-Final Test
sealing. Guideline sealing is sealing work CFM 50 of Building Comfort Sealing
(Final Test) (No Blower Door Test)
completed using the WI Cost Effective
Sealing Guidelines
(WCEG).WCEG • Comfort Sealing. Document the time spent on comfort sealing in the work hours
must be used with all column. Comfort sealing is preformed when blower door testing cannot be preformed.
blower door guided Sealing work is limited to attic bypass and key junctures and other sealing that will
sealing. effect the occupants comfort. It is limited to 1 labor hour.
CFM of Exhaust Appliances (bottom middle of the page).
• Document pre cfm of the existing individual exhaust appliances.
CFM of Exhaust Appliances
Measure or estimate cfm of existing exhaust. If ventilation is
Pre Final needed actual measurement should be completed.
Dryer • Total the cfm of the existing individual exhaust appliances at the
Bath 1 bottom of the column.
Bath 2 Note if the amount of existing ventilation is less than the required
ventilation (BTLa). The BTLa program does not calculate existing
Kitchen ventilation, only the ventilation required for the building. The
Other existing ventilation should be assessed for capacity and, where
Total CFM Exhaust: feasible, utilized for all or part of the ventilation requirement.
Note if the amount of existing ventilation exceeds the maximum exhaust allowed (DTL). This problem must be
solved as a part of the planned weatherization work. The building may require a change to venting or
combustion appliances, or added make-up air.
• Repeat the steps listed above to document the final test results. If ventilation has been installed an actual
measurement is recommended.
• Total the cfm of the existing individual exhaust appliances at the bottom on the column.
Note the post Worst Case Depressurization of the building (from page two). If the post Worst Case
Depressurization is greater than the maximum Delta P for the building, based on the Depressurization Guideline
Chart, the problem must be solved prior to completing the weatherization work. The building may require
additional returns, distribution sealing, a change to venting or combustion appliances, or added make-up air. If
make-up air is to be added the existing exhaust appliances must be measured.
Make-up Air Calculations (bottom right of page)
To verify that make-up air is necessary see the Make-Up Air Check Make-up Air Calculation
Worksheet. WI Uniform Dwelling codes required make-up air when the CAZ
is excessively depressurized or pressurized. Add make-up air that is 40% of Total cfm Exhaust
exhaust ventilation. Use Building Depressurization Guidelines to determine if Times 40% X .40
depressurization exceeds guidelines.
CFM of Make-up Air
• Enter total exhaust air (both continuous and intermittent) in top box.
• Multiple the total exhaust by 40% (.40).
• Total exhaust X.40 equals the amount of make-up air required (cfms).
WI Division of Energy-EAB
Page 4 12/8/04
Make-up Air Check
(Follow these steps to determine if make-up air is required to assure balanced ventilation.)
Step #1
Is the final ∆P less Yes If yes, no further action is required.
than or equal to the Yes Go to Step #2.
Building No Is the problems caused by exhaust?
Depressurization No Go to Step #3.
Guidelines? (Chart)
Step #2
Verify cfm exhaust estimates with actual measurement.
cfm
Dryer
Bath 1 Is final exhaust Yes Go to Step #3
Bath 2 cfm less than or
Kitchen equal to DTL No Add Make-up air
Other maximum? and/or
Modify exhaust
Step 2a. Total for safe operation
Step #3
Modify and/or seal distribution system. RETEST
Is the final ∆P Yes If yes, no further action is required.
less than or
equal to the No Add Make-up air
Per Wisconsin Uniform Dwelling code when
Building and/or
CAZ is excessiv ely depressurized or
Depressurization Modify exhaust pressurized, add make-up air that is 40% of
Guidelines? for safe operation exhaust ventilation.
(Chart)
Make-up Air
Use total from Step 2a Total cfm Exhaust
Times 40% X .40
WI Division of Energy-EAB CFM of Make-up Air
Revision: 12/8/04
Diagnostic Testing and Modeling
Agency Pre-WX Pre-WX
Tester Test Date
Building Post- Post-WX
ID # Tester Test Date
Building Tightness Limits (BTLa) Depressurization Limits (DTL)
Pre Final
As Is Test Final Test Total Exhaust cfm
(As Measured or Estimate)
House CFM50
Maximum ∆P
Flow Exponent (Bldg Dep Guideline Chart)
(Default .65)
Building Height (ft) Flow Exponent
(Default .65)
Weather Factor
Solve for DTL (cfm50)
House Volume (cu ft) Story Height (ft)
# People Pre Final
House Floor (sq ft)
# Bedrooms
House CFM50
Occupant Count Maximum ∆P
(larger of # of people or # of bedrooms+1) (Bldg Dep Guideline Chart)
Flow Exponent
Building Tightness Limit (BTLa:CFM50) (Default .65)
Solve for Total
Exhaust (cfm)
As Is Est Final
Continuous Ventilation Needed (BTLa Worst Case Delta P
cfm50) (∆P)*
*record the max. ∆P from Pre-WCD *record the max. ∆P from Post-
adjusted for baseline (page 2) WCD adjusted for baseline (page
2)
Results: Blower Door Tests and Sealing Work CFM of Exhaust Appliances Make-up Air Calculation
Pre Final To verify that make-up air is
cfm@ 50 Work Hours necessary see Make-Up Air Check
Non-Guideline Dryer Worksheet. Wisconsin Uniform
CFM 50 of Building
Reduction (As Is Test- Dwelling code when CAZ is
(As Is Test)
Pre Test) Bath 1 excessively depressurized or
pressurized, add make-up air that
CFM 50 of Building Guideline Reduction is 40% of exhaust ventilation.
Bath 2
(Pre Test) (Pre Test-Final Test)
Total cfm Exhaust
Kitchen
CFM 50 of Building Comfort Sealing
(No Blower Door Test)
Times 40% X .40
(Final Test)
Other
CFM of Make-up Air
WI Division of Energy-EAB Total CFM Exhaust:
Revision 12/8/04
Combustion Safety Testing
Building DTL and CAZ Pressure Differentials Gas Range CO Testing Results
Pre-WX Post-WX
Delta P Delta P Pre-WX Gas Range CO Testing
Baseline Depressurization Left Rear Right
(Interior doors open, CAZ door closed, Burner PPM Rear PPM
exhaust appliances off, record pressure) Left Right
Front PPM Front ppm
Turn on All Exhaust Appliances in the
Building Oven
(Record Pressure) ppm air free
Forced Air Distribution Impact on Delta P Post-WX Gas Range CO Testing
Left Rear Right
Turn On Furnace Air Handler Burner ppm Rear ppm
(Record Pressure.) Left Right
Front ppm Front ppm
Position Interior Doors
(Smoke door; if smoke drawn into room open door, if
smoke pushed out or neutral, close door. Record Oven
ppm air free
Pressure.)
Other Post-WX CO Testing
Open Door to CAZ
(Record Pressure)
Worst Case Depressurization
Adjusted for Baseline:DG3-subtract baseline; DG700-
use the baseline feature to adjust
(Use Pre for 'As Is' Worst Case Delta (Use Post for 'Results' Worst Case
P (∆P) on page 1. Delta P (∆P) on page 1)
Draft, Spillage, and CO Measurements
[Under Worst Case Draft conditions. Draft test in flue(s). CO test before appliance draft diverter or barometric damper.]
Pre-WX Post-WX
Pass/ Recreate w/ WCD (greatest Pass/
Draft Spillage CO PPM Fail negative ∆P) Draft Spillage CO PPM Fail
Cycle Water Heater
(Reading in flue@ 3 min)
Cycle Furnace
(Gas: measure @3 min.)
(Oil: measure @ 10 min. )
Other Appliance
Specify:
COMMENTS:
WI Division of Energy-EAB
Revision: 12/08/04
Set-up for Combustion Safety Tests
These tests are required when atmospheric combustion appliances are present. CAZ depressurization should be measured for any appliance type.
DTL Test: Use TI-86 w/ ZipPro Software to solve for minimum blower door cfm50 and maximum exhaust cfm. Document 'As Is' and final conditions for testing variables, air sealing,
worst case delta P and ventilation results. Follow set-up procedure below.
Worst Case Draft Test: Completed on all dwellings with atmospheric combustion appliances that are designed to be vented to the outside of the building. Document results.
Recreate greatest negative pressure for testing draft and spillage tests. Test pre and post weatherization work. Follow set-up below.
Worst Case Draft Test and Depressurization Test Limit Initial Set-up
Top tap to CAZ or
1. Close house. Open in CAZ
2. Install hose from input or top
tap to the CAZ
-2
Bottom reference
3. Install hose from reference or tap to Outside
bottom tap to the exterior INPUT
INPUT
-2
4. Reading is the pressure A B
difference between CAZ & Reference A
Outside (Baseline)
5. For use with Building
Depressurization Guidelines
adjust Worst Case
Depressurization by baseline
Top tap to CAZ or
reading (from step 4). Open in CAZ
Top tap to CAZ or
Open in CAZ To Flue for Draft
To Flue for Draft
-2
-2
Bottom reference
tap to Outside
A B
INPUT INPUT
REFERENCE
INPUT
A
B
INPUT
To Overfire Draft REFERENCE
Bottom reference REFERENCE
tap to Outside REFERENCE
For Oil Furnace draft and CO test:
For Gas Water Heaters: draft and CO test: 1. Drill hole in flue before the barometric damper. Install
1. Install hose from input, or top tap, to center of flue, half hose from input, or top tap, to metal sleeve and take draft
way between the divertor and the chimney. test in each location. A second draft test should be taken
2. Measure Draft after 3 minutes, at the overfire.
3. Measure CO after draft. 2. Measure Draft after 10 minutes,
4. Measure Spillage use smoke generator at divertor. CO Test before diverter for gas and oil appliances. 3. Measure CO after draft.
4. Measure Spillage use smoke generator at barometric
damper.
When testing for CO continually monitor CO of ambient air.
WI Division of Energy-EAB
Revision: 12/08/04
Guidelines and Action Levels for Combustion Safety Testing
Building Depressurization Guidelines
Building Depressurization Guideline
Maximum Depressurization for Combustion Appliance Zones
By Appliance Type
Adjust readings for baseline by subtracting the baseline reading(CAZ wrt
Outside) from measured WCD pressure. Example: Baseline is -2, WCD is -
ND Water ND Heating ND Water ND Water PV Water 5, Adjusted reading is -3. If using DG700, use the baseline feature to
Appliance Heater System or Hter & Htg Hter & ID ID Heating Heater & automatically adjust the reading.
Type: (Orphaned) Stove System Htg System System SC Furnace
Pascals: -2 -5 -3 -5 -15 -25
Key:ND=natural draft; PV=power vented (water heater or condensing furnaces with one pipe, typically sidewall PVC vent, draws combustion air from CAZ); ID=Induced draft
(open flame with an induction fan venting to chimney);SC=sealed combustion (a condensing furnace that draws combustion air from and vents to the outside, typically
sidewall PVC pipe(s)). The Depressurization Guideline is based on the guidelines used by the Minneapolis Center for Energy and the Environment and the Energy
Conservatory. If basement depressurization is below -15, fire power vented water heater too assure there is no flame rollout.
Acceptable Draft Readings for Atmospheric Combustion Appliances
Acceptable Draft Test Readings for Gas Appliances Acceptable Draft Test Readings
with Respect to Outdoor Temperature for Oil Fired Furnaces
°F <20 21-40 41-60 61-80 >80 °F Acceptable Draft
pa. -5 -4 -3 -2 -1 pa. Location w.c.i. pascals
w.c.i. -.02 -.016 -.012 -.008 -.004 w.c.i. Overfire Draft -0.02 -5
Flue Drafts -0.04 to 0.06 10 to 15
Guidelines based North Dakota WX Assistance Program guidelines.
Acceptable Carbon Monoxide Readings in Heating System & Action Levels for Gas Ranges
Carbon Monoxide Action Level: Action Levels for Range Top Burners
Gas & Oil Heating Systems CO PPM Measuring
Action
As As Time
Appliance Measured Air Free < 25 PPM 3 min. Advise customer to clean.
Gas/Furnace Boiler 100 PPM 200 PPM 25-50 PPM 3 min. Have appliance serviced
Gas /Oil Water Heater 100 PPM 200 PPM > 50 PPM 3 min. Do not use appliance until repaired or replaced.
Oil Furnace/Boiler 100 PPM 200 PPM
Guidelines based North Dakota Weatherization Assistance Program guidelines. Note: When testing ranges, continually monitor ambient space around oven during testing to protect inspector and
customer . Retest ambient air to ensure no change in CO from initial tests.
Action Levels for Gas Ovens
Measuring
Air Free CO PPM Action
Time
< 800 PPM >10 min. Should be cleaned by client to prevent possible CO problems.
> 800 PPM, <1000 PPM >10 min. Have appliance serviced
>1000 PPM >10 min. Oven should not be used. Replace appliance.
WI Division of Energy-EAB
Revision: 12/08/04
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