How to resolve valve failures in batch furnaces?
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A problem that’s been giving me a lot of headaches lately is that the primary air valve of an intermittent furnace fails to open from time to time. I’ve checked various potential issues (the wiring, solenoids, microcomputer, etc.), but without success; the furnace shuts down after just one cycle. Stop the furnace and turn it on again after a few dozen minutes; it can run for an hour or so. Let’s all analyze it and figure out what’s going on.
Valve plate jam； Oil leakage in the cylinder ； Oil leakage from the downflow valve ； Microcomputer relay failure
It won’t turn on; safety accidents generally do not occur. When it fails to turn on again, check the following: 1. Whether a 24V signal is being sent to the solenoid valve. This valve should operate when powered; use a metal object to test whether the magnetism of the solenoid part is present. If there is no magnetism, it indicates that the signal has not been sent； 2. Check whether the solenoid valve piston has moved to its normal position; if it cannot reach the normal position, it indicates that there are foreign objects blocking the solenoid valve and the associated oil circuit ； 3. If everything is normal as mentioned above, it is possible that there are foreign objects in the oil circuit behind the solenoid valve or that the valve plate is stuck. First, shut down the furnace to resolve any issues with the oil circuit; if the problem persists, then check the valve plate. Also, check whether the pressure in your return oil line is high, which may be causing poor return of oil.
There should be no problem with the solenoid valve, as countless of them have been replaced. The cylinder has also been replaced. I’m also working on fixing the fuel system now; I hope that after it’s fixed, I’ll be able to drive smoothly.
Is the primary air air? Our terminology might differ from yours. Check the valves, cylinders, solenoid valves, oil, and oil pumps to see where there could be problems. Also, could it be that the oil pressure was temporarily too low? Take a look at the records to see if too many valves were activated at once, which might have prevented this from working