The _____ has adopted most safety requirements from the National Fuel Gas Code. The _____ has adopted many safety requirements from the National Fuel Gas Code.
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What is a dangerous situation where combustion products enter a building from within the combustion or venting system of a vented combustion appliance, caused by backdrafting, blockages in the vents, or leaks within the system? What is the part of a venting system that collectively ejects flue gases...
Which of these is not a proper approach for evaluating combustion safety for gas-fired water heaters, boilers, and furnaces? Evaluate CO concentrations in both the appliance flue and in the occupied space. Assess whether the vent is installed according to code. Operate appliances at low settings to...
At what ambient level of CO can harmful side effects occur? 9 ppm CO 35 ppm CO 70 ppm CO 200 ppm CO All of the above How often should you conduct a combustion safety test? Once every 3 months. Every time there is a change to the heating and ventilation system or after air sealing. Any time a part of...
Why have residential combustion safety tests changed from testing under worst-case conditions to those at a level closer to common household appliance operation?
For a residence with three natural draft Category I vented appliances with natural drafts of 120,000 Btu/hr, 150,000 Btu/hr, and 100,000 Btu/hr, all sharing an indoor airspace with an ACH of 0.5 with a ceiling height of 8 feet, how much indoor surface area is required for these appliances to be...
When assessing a combustion appliance for spillage, how long should the main burner be in operation before making the assessment? 3 minutes 5 minutes 10 minutes 15 minutes Which of the following does not apply to the screening protocol used to assess combustion appliances that use indoor air? Any...
Which conditions for residences do not allow retrofit work to proceed without extensive combustion safety diagnostics or performance-based protocols, similar to those that qualify for appliance zone isolation? All combustion appliances are depressurization resistant. The residence is extremely leaky...
At what concentrations of indoor air ambient CO should a qualified professional be contacted to address the CO contamination due to a permanently installed appliance? Select all that apply. At CO concentrations of 9 ppm to 35 ppm. At CO concentrations of 36 ppm to 69 ppm. At CO concentrations of 70...
Answer the following questions about remediation: When can remediation be implemented in the process of evaluating combustion safety? In the event of combustion safety failure at test-in or test-out, under which circumstance can remediation measures be implemented before needing to contact a trained...
1. According to the NREL model, what percentage of the energy used in HVAC systems is estimated to be attributed to installation-related faults, leading to a substantial financial burden on utility bill payers? 2. Identify one symptom of insufficient airflow in an HVAC system and explain its...
1. What is the main goal of residential HVAC commissioning?
1. Name one organization that establishes standards or guidance for residential HVAC commissioning.
1. You're evaluating an older system with complaints of inconsistent temperatures. What three tests would be your priority, and why? 2. A client is unsure why their energy bills remain high after a newer, efficient HVAC was installed. Without major re-commissioning, what test(s) could uncover likely...
1. Describe a traditional method for measuring refrigerant charge vs. how a smart diagnostic tool streamlines the process.
Over half of the indoor air quality problems result from ____________________? 1. Increasing toxicity of mold 2. Inadequate ventilation 3. Excess dust due to insulation 4. Low oxygen levels.
What are the most common gases used between the two glass panes in double-pane glazing?
Evidence of moisture problems in a building can include: Damp feeling, odors; mold and mildew; peeling paint and sweating pipes Shrinking, warping, rotting wood; drawers that stick Condensation, frost and ice dams on windows Discoloration corrosion, oxidation, or rust of building materials All of...
What are the conditions that must exist for mold growth to occur? Mold spores must be present. Temperatures must be between 35°F and 100°F. A naturally occuring food source must be available. Moisture must be available in sufficient quantities. All of the above
Problem Set 3.1: Which of the following is true about condensate from HPWHs? It is highly acidic. It forms from the moisture in the air. Only a certified contractor can handle it. It will naturally evaporate so you do not need to worry about drainage. True or False: HPWH condensate drainage blockage...