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| fixit:
I like to make things work that break rather than buy new. Today the gas valve in the furnace stopped working. Normally it would be powered directly by 24vac, but this valve has a simple circuit on it to power it with dc current. I traced the leads on the board to the components and came up with a diode bridge and an electrolytic cap on the dc output side between the pos and neg. It looks very simple, 5 components. The diodes are 1n4007 and the capacitor says 220uf 50v. It has the number h401(m) and the name LELON. RJA105°C I want to replace the cap since it doesn't seem to meter correctly and one of the diodes is shorted out. Looking at replacement capacitors, I find there is a series associated with each capacitor. Is that the (M) in the number mentioned above that indicates the series? Can anyone explain what the series indicates or differentiates on capacitors? There are many capacitors on the newark web page that have the look of the one I removed. I'm thinking that this one could be the replacement I need.... ECA-1HM221 Electrolytic Capacitor, 220 µF, 50 V, M Series, ± 20%, Radial Leaded, 2000 hours @ 85°C only problem is the heat temperature, mine says 105°C and this one says 85°C. The gas valve coils meter at 120 Ohms and is probably correct other are simular, but I don't have the specs on it. Rebuilding this circuit would be much better than spending $180 on a new valve. Any help would be appreciated. Rex |
| bob91343:
Often the letter M specifies 20% tolerance. F = 1% J = 5% K = 10% M = 20% If I remember correctly. In this case you'd have to check manufacturer's data to be sure. I don't recommend 85 degree components; 105 degree units aren't enough more money to make a difference. |
| james_s:
You're overthinking this, it is not a critical application at all. Virtually any 220uF 50V capacitor you can find will work. Selecting a 105C part can't hurt but is not really necessary either unless it's in something that gets hot. Personally I like Nichicon, Rubycon and Panasonic but the brand is not all that important either. |
| helius:
Lelon is a second-tier, fairly well respected manufacturer, and available from major distributors like Mouser or Digikey. I wouldn't immediately suspect it before measuring its capacitance. |
| Zero999:
--- Quote from: james_s on November 03, 2020, 06:41:32 am ---You're overthinking this, it is not a critical application at all. Virtually any 220uF 50V capacitor you can find will work. Selecting a 105C part can't hurt but is not really necessary either unless it's in something that gets hot. Personally I like Nichicon, Rubycon and Panasonic but the brand is not all that important either. --- End quote --- Well in this case: --- Quote from: fixit on November 03, 2020, 05:14:33 am ---I like to make things work that break rather than buy new. Today the gas valve in the furnace stopped working. --- End quote --- --- Quote ---only problem is the heat temperature, mine says 105°C and this one says 85°C. --- End quote --- So a 105°C part is a must! |
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