Spreadsheet: c336c3e3-1dd2-494c-aee0-7355e84629f8
Sheet: Sheet1

Diagnostic and Combustion Safety Form Directions | Unnamed: 1 | Unnamed: 2 | Unnamed: 3 | Unnamed: 4 | Unnamed: 5 | Unnamed: 6 | Unnamed: 7 | Unnamed: 8 | Unnamed: 9 | Unnamed: 10
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 the pressure difference (Delta P) between the Combustion Appliance Zone (CAZ) and the outside.
2) Turn on Exhaust Appliances. Turn on all of the exhaust appliances in the building, measure, and record pressure. A negative reading larger than Step 1) Baseline usually means the exhaust fans depressurize the CAZ.
3) Turn on the Air Handler. Measure and record pressure difference (Delta P). A negative reading larger than Step 2) exhaust fans, usually means the return ducts depressurize the CAZ.  A positive reading usually means there are supply ducts pressurizing the CAZ. Determine distribution sealing needs based on this reading and other diagnostic tests (when needed).
4) Position Interior Doors. Use a smoke product device and smoke each of the interior doors to determine whether to open or close the doors. If smoke is drawn into the room, open the door. If smoke is pushed out of the room or is neutral, close door.
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, [NAME], 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 100 PPM.
• Repeat these steps for other appliances.
• Document any important circumstances.
• Failed appliances must have problem resolved prior to the completion of the weatherization work.
Page 2: Combustion Safety Testing Continued
Post Weatherization Draft, [NAME], 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 adjustment for oxygen content).
 |  |  |  | 1. Remove all pots and foil from the burner area.
 |  |  |  | 2. Turn all range top burners on high and allow to warm.
 |  |  |  | 3. Test 6” above the flame without pots or test fixtures.
 |  |  |  | 4. Record reading (3 minutes).
 |  |  |  | Testing Range Ovens ( must be tested air free with adjustment for oxygen content)
 |  |  |  | 1. Test ranges and ovens after all other vented appliances have been tested
 |  |  |  | 2. Remove any items stored in the oven and any foil coverings before proceeding.
 |  |  |  | 3. Assure that self cleaning features are not activated.
 |  |  |  | 4. Insert the instrument probe into the vent sleeve before dilution air mixes with combustion by-products
 |  |  |  | 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.