Sample interview questions: Can you explain the process of purging air from hydronic systems and why it is important?
Sample answer:
- Isolating the System:
- Identify the highest point in the hydronic system, usually a radiator or air vent.
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Close the isolation valves or dampers on the supply and return lines leading to and from that point. This isolates the system section where air is to be purged.
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Opening the Air Vent or Bleeder Valve:
- Locate the air vent or bleeder valve at the highest point of the isolated section.
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Slowly open the valve using a key or a screwdriver, allowing air to escape.
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Observing the Water Flow:
- As air is released, you’ll notice water flowing from the vent or bleeder valve.
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The water flow indicates that the air is being replaced by water, pushing it out of the system.
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Closing the Air Vent or Bleeder Valve:
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Once a steady stream of water flows from the valve without any signs of air bubbles, close the valve tightly.
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Repeating the Process at Other Points:
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If there are multiple high points or radiators in the system, repeat steps 1-4 at each of those locations to purge air from the entire system.
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Checking System Pressure:
- Once all air has been purged, check the system pressure using a pressure gauge.
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Adjust the pressure to the… Read full answer
Source: https://hireabo.com/job/12_0_14/Hydronic%20Technician