Some Furnace Questions I received an from a podcast listener with some furnace related questions. Based on the nature of the questions I figured
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1 Some Furnace Questions I received an from a podcast listener with some furnace related questions. Based on the nature of the questions I figured it would be better to ask an experienced furnace tech. Benoît Mongeau agreed to help by answering the questions.
2 expected resistances across the solenoid in the gas valve? What expected readings should we consistently get from a properly working system (voltage of thermopile alone, with gas valve open, with thermostat closed etc) On high efficiency What is the relationship between the pressures in the collector box of the secondary exchanger and the pressure switch? How does a clogged condensate trap lead to the pressure switch not closing? Another Question Is it possible to check readings from the circuit board when the wires are in a harness? For example, I troubleshot a gas valve failure. It was either the board or the valve. The wires coming to the gas valve from the board are in a harness. How do I know which to check and what am I checking for. (Given that everything else was working I leaned toward a faulty gas valve and was right, just so you know!) Thanks for your time and for doing the podcast. All the best, Matt For the collector box/pressure switch: During normal operation, the collector box is under a vacuum (negative pressure) when the inducer is running. That vacuum is what the pressure switch checks for. If the vacuum is sufficient the contacts will close and signal the board everything is good. If your condensate trap is blocked, the collector box will still be under a vacuum. That doesn t change. However, the pressure switch port (where the tube is attached on the collector box) should be at the bottom of the box,
3 usually near the drain port. The backed up condensate will simply end up blocking that port and the switch will no longer be able to feel the vacuum, the contacts won t make and you will get an error (pressure switch not closing or stuck open). What may also happen, but not always, is that the port will block during a cycle and the vacuum will remain stuck in the pressure tube. As your inducer comes off and normal pressure returns, the air can t go in the pressure tubing because it s blocked with condensate, and you re basically trapping that vacuum inside. So the contacts will stay closed, until the next call for heat. When that call starts, the contacts will already be closed before the inducer starts, and that will also give you an error (pressure switch stuck closed). Now if your exhaust is blocked, this will create back pressure and your collector box won t be under the appropriate vacuum, and once again won t close. For millivolt systems: Unfortunately, I can t say what typical resistance values would be for a mv gas valve because I don t know. I would say however that in three and a half years I haven t had to replace a fireplace gas valve. They rarely go bad. In most cases the pilot tube/orifice is dirty, the thermopile is too weak, or, if it works with a wall switch, very very common: the switch is bad. Standard wall switches are meant for AC voltage. Running millivolt DC thru them will work, but as soon as you have a bit of resistance in the switch contacts, that voltage will not get through. If it runs on a thermostat, usually it works better but you can still get the same problem. For typical readings, I d say between mV from the thermopile alone, open circuit. With the valve open (so, closed circuit) around mV. But this is very general, it may vary a lot between systems.
4 If your thermopile alone doesn t produce enough mv s, check your pilot flame. Make sure it hits the thermopile well. You might be able to adjust it (on some valves) to make it bigger. As I mentioned, the orifice or tubing may be blocked. That is relatively common especially if the pilot was kept off for a long time. If your thermopile gives enough voltage but the valve won t open, check your switch/tstat and even the wire itself for any significant resistance or short. Isolate section by section and ohm it out. If everything is good and sufficient mv s come back to the valve and it still won t open, then yes, that valve might be bad. But I d probably even replace a switch/tstat before I condemn the valve regardless, just to be sure, just because changing those valves in most cases is a total pain in the butt. For the gas valve/board dilemma: If your wires are all in a harness with a big fat connector on the board, there s a good chance you won t be able to pull it off and diagnose on the board pins, because by removing the connector you remove most or all of the safety circuits. If you want to look at the gas valve, you need to hook your meter on the wires at the valve itself. If it s just a standard 24v valve with 2 or 3 terminals (Common + hot or
5 best advice is to follow your electrical diagram. If there s no way for you to disconnect wires at either end (which should never happen as far as I know ) you could always cut the wire and check your voltage in the wire itself. But try to avoid doing that. Ben
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