Arzel Zoning
Watch this video to learn how you can quickly find the issue when there's a problem with damper operation on an Arzel Zoning system. Start by narrowing it down to one zone, then use this process to find the problem component in that zone.
Hello and welcome back to Arzel Zoning. In a previous video, we covered how to determine which zone is causing a problem when dampers are not closing or responding correctly. Now we are narrowing it down further to identify exactly what component on that zone is causing the issue. In this example, Zone 1 was identified as leaking. The Zone 1 airline (red line) is being used for diagnosis. The first step is to go to the first damper in the zone and pinch the line before the tee. When this is done, pump sound changes and the manometer shows pressure rising to around 63 inches of water column, confirming that the line is good up to that point. Next, the line is pinched after the tee. In this case, there is no significant pressure change, indicating that the first damper in the sequence is likely leaking. During installation, it is recommended to leave a service loop. This allows the technician to easily score the tubing, remove the connection at the damper, and cut off a small section of tubing for reconnection without difficulty. To isolate the damper, a plug (FIT-TP025) is used to cap the airline. Once plugged, the line is tested again after the tee. If pressure immediately rises to around 63 inches, it confirms the damper was the source of the leak. The process continues down the line. After releasing the plug, pressure drops again and pump sound changes, indicating another potential leak in the system. Each subsequent damper is tested by pinching the line after each tee. When a damper is healthy, pump pitch changes and pressure increases as expected, confirming no leak at that point. The final component in the system is the EzyHub. When testing this section, the manometer can be connected directly while isolating dampers individually using caps. This allows precise isolation of the problem area. If pressure still does not hold after isolating a damper, the issue is likely between the EzyHub and the last damper in the line. In this case, inspection reveals a damaged red cap on the EzyHub, likely caused by a rodent. After replacing or isolating the damaged cap and reconnecting the system, pressure rises above 40 inches, confirming proper operation. The final diagnosis shows both a damaged cap and a single faulty damper as the sources of the leak. This step-by-step isolation process allows technicians to systematically identify and resolve zone leaks.
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