savageseadog
Well-Known Member
220R or 220 ohm power resistor 20 + watts used/new or whatever for my Rayburn boiler which has packed up.
Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Cheshire
- Thread starter savageseadog
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gwh
New Member
Re: Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Ches
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220R or 220 ohm power resistor 20 + watts used/new or whatever for my Rayburn boiler which has packed up.
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For an emergency you can make one with a domestic lightbulb or two. A 250W lightbulb will draw about one amp at 250V, so its resistance will be about 250 ohms. Two 120W lightbulbs in parallel will do about the same. The resistance of the filament will be a lot higher when it's white hot that it is when it's cold, so you may need to experiment. Sounds to me like your original resistor was going to be expected to take a reasonable current, as it's rated at 20W which means a maximum of about 0.3 amps. My guess is that a 250W lightbulb would glow very feebly at that, and it would have a resistance in the right ballpark.
Of course I might not know what I'm talking about, so you should exercise caution - especially in matters electrical/domestic/gas, where you might not legally be able to do your own repairs anyway.
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220R or 220 ohm power resistor 20 + watts used/new or whatever for my Rayburn boiler which has packed up.
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For an emergency you can make one with a domestic lightbulb or two. A 250W lightbulb will draw about one amp at 250V, so its resistance will be about 250 ohms. Two 120W lightbulbs in parallel will do about the same. The resistance of the filament will be a lot higher when it's white hot that it is when it's cold, so you may need to experiment. Sounds to me like your original resistor was going to be expected to take a reasonable current, as it's rated at 20W which means a maximum of about 0.3 amps. My guess is that a 250W lightbulb would glow very feebly at that, and it would have a resistance in the right ballpark.
Of course I might not know what I'm talking about, so you should exercise caution - especially in matters electrical/domestic/gas, where you might not legally be able to do your own repairs anyway.
savageseadog
Well-Known Member
Re: Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Ches
Hi
I would have done that but the resistor sets the airflow into the burner, if it wasn't pretty much spot on it would blow smoke or not fire at all. I would have done it if I was absolutely desperate. I had thought about stripping the toater down! I have a log burner fortunately so we're sat round it which is OK except the rest of the house is freezing.
Thanks anyway and Happy Christmas.
Hi
I would have done that but the resistor sets the airflow into the burner, if it wasn't pretty much spot on it would blow smoke or not fire at all. I would have done it if I was absolutely desperate. I had thought about stripping the toater down! I have a log burner fortunately so we're sat round it which is OK except the rest of the house is freezing.
Thanks anyway and Happy Christmas.
geoffatstanpit
Well-Known Member
Re: Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Ches
A couple of 10w 470 ohm resistors in parallel from your local Maplin would be close.
A couple of 10w 470 ohm resistors in parallel from your local Maplin would be close.
nedmin
Well-Known Member
Re: Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Ches
Have you got an old electric single bar fire and a ohm meter if so you can easily make one.probably strip the burnt out one and wind on that former.wind on with a space between, seal in place with something like polyfilla,let dry . try charity shop for a heater or R/S components when things get back to normal. 220ohm resistor 25watts stock no. 157-594
Have you got an old electric single bar fire and a ohm meter if so you can easily make one.probably strip the burnt out one and wind on that former.wind on with a space between, seal in place with something like polyfilla,let dry . try charity shop for a heater or R/S components when things get back to normal. 220ohm resistor 25watts stock no. 157-594
lenseman
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Re: Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Ches
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220R or 220 ohm power resistor 20 + watts used/new or whatever for my Rayburn boiler which has packed up.
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Try this firm in Surrey:
http://www.willow.co.uk/html/rf_resistors.html
Their Metal Film Resistors seem to be close?
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220R or 220 ohm power resistor 20 + watts used/new or whatever for my Rayburn boiler which has packed up.
[/ QUOTE ]
Try this firm in Surrey:
http://www.willow.co.uk/html/rf_resistors.html
Their Metal Film Resistors seem to be close?
nedmin
Well-Known Member
Re: Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Ches
Re my post electric fire no good would need to make a bl--dy big resistor in physical size ,to get 220ohms !! too much wine too much port, still the part no. is ok!!
Re my post electric fire no good would need to make a bl--dy big resistor in physical size ,to get 220ohms !! too much wine too much port, still the part no. is ok!!
savageseadog
Well-Known Member
Re: Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Ches
Thanks for the suggestions. I'm going to get one from RS components. Christmas is over tomorrow /forums/images/graemlins/frown.gif I actually thought Wednesday was a bank holiday.
All the best for the New Year
Thanks for the suggestions. I'm going to get one from RS components. Christmas is over tomorrow /forums/images/graemlins/frown.gif I actually thought Wednesday was a bank holiday.
All the best for the New Year
William_H
Well-Known Member
Re: Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Ches
For 220 ohm 10 watt. you can use 2x 440 ohm (470) in paralell. or 4x 880 ohm 5watt in paralell (or nearest available)
or 2X 110 ohm in series or 4X 50 ohm in series. there are lots of options to get what you want. olewill
PS light globes change resistance dramatically with temperature so if it is not fully lit then the resistance will be a lot lower than calculated.
For 220 ohm 10 watt. you can use 2x 440 ohm (470) in paralell. or 4x 880 ohm 5watt in paralell (or nearest available)
or 2X 110 ohm in series or 4X 50 ohm in series. there are lots of options to get what you want. olewill
PS light globes change resistance dramatically with temperature so if it is not fully lit then the resistance will be a lot lower than calculated.
tome
Well-Known Member
Re: Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Ches
Have to ask yourself why a 220 ohm 20 Watt resistor has burned. Replace it by all means, but look for a short downstream in the fan. Perhaps fan jammed by fluff/dirt and no longer rotating so stalled and shorting out the resistor?
Buy 2 resistors from RS just in case...
Have to ask yourself why a 220 ohm 20 Watt resistor has burned. Replace it by all means, but look for a short downstream in the fan. Perhaps fan jammed by fluff/dirt and no longer rotating so stalled and shorting out the resistor?
Buy 2 resistors from RS just in case...
mikefleetwood
Well-Known Member
Re: Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Ches
Arrived on this one a bit late ..... but RS is probably your best bet. There are several electronic/electrical component suppliers that will deal direct with the public. Untill a few years ago, they were all "trade only", so you had to get your local TV repair man to order stuff for you, unless you could find a "Tandy" or similar. Now you can visit online catalogues and pay by credit card from the likes of RS, Farnell, Rapid, CPC and Maplin. All probably similar in prices, but RS/Farnell will carry the widest stock. Also good for mechanical bits, gears, bearings, nuts & bolts (including SS), etc. etc.
Arrived on this one a bit late ..... but RS is probably your best bet. There are several electronic/electrical component suppliers that will deal direct with the public. Untill a few years ago, they were all "trade only", so you had to get your local TV repair man to order stuff for you, unless you could find a "Tandy" or similar. Now you can visit online catalogues and pay by credit card from the likes of RS, Farnell, Rapid, CPC and Maplin. All probably similar in prices, but RS/Farnell will carry the widest stock. Also good for mechanical bits, gears, bearings, nuts & bolts (including SS), etc. etc.
savageseadog
Well-Known Member
Re: Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Ches
Again thanks to all who responded. I am well aware of the potential pitfall of the fan being siezed or just stiff. Funnily enough in the Rayburn book there is a section devoted to replacing these resistors, which makes me think it's a common event. I'm going up to 50W from the original 25W anyway.
Again thanks to all who responded. I am well aware of the potential pitfall of the fan being siezed or just stiff. Funnily enough in the Rayburn book there is a section devoted to replacing these resistors, which makes me think it's a common event. I'm going up to 50W from the original 25W anyway.
tome
Well-Known Member
Re: Urgent Need a 220 Ohm 20 watt plus Power Resistance Pref Near Ches
50W will last a little longer, no doubt about it
Stall current of about an amp means you'd need >250W to survive it but space may be a problem hence the clear replacement instructions...
50W will last a little longer, no doubt about it
Stall current of about an amp means you'd need >250W to survive it but space may be a problem hence the clear replacement instructions...