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06-14-2017, 10:53 PM | #1 |
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Join Date: Oct 2015
Location: Fremont, CA
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39 blower switch
I am trying to refurbish a 1939 hot water blower switch. I believe it is missing a resistor (or 2) that I think provides the different voltage for fast and slow blower speed. Does anyone know if there was one or two resistors; what were their resistance value and which terminals does it (do they) attach to (A, B, C, D in attached picture)?
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06-15-2017, 06:46 AM | #2 |
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Re: 39 blower switch
One resistor of 1.0 Ohm. connected from B or C (they are both the same point electrically, common to each other) to A or D (they are both the same point electrically common to each other) The resistor appears to be rather high wattage.
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06-15-2017, 11:12 AM | #3 |
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Re: 39 blower switch
Terry,
Thanks for responding. Current state of my switch: yes B and C are common, but A and D are isolated from each other and from B and C. (I have included a picture of switch plate from the other side, same labels.) I do see remnants of wires under each terminal on the top side of the plate (original picture). Perhaps A and D were commoned with a wire? |
06-15-2017, 08:25 PM | #4 |
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Re: 39 blower switch
I believe my switch is slightly later in vintage. Your switch appears original to 39 & 40 below are a couple of switch diagrams. Your switch does not appear to use a resistor.
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06-16-2017, 11:14 AM | #5 |
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Re: 39 blower switch
Terry,
These sheets are very helpful. As I indicated, there seems to be remnants of wires under the 4 terminals I labeled as A, B, C and D. Your sheet shows 2 resistors attached to those terminals. I think these are to provide reduced voltage to get reduced blower speed. I just need to determine the resistor value and how to attach new resistors. Thanks again. |
06-16-2017, 07:23 PM | #6 |
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Re: 39 blower switch
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06-17-2017, 02:55 PM | #7 |
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Re: 39 blower switch
Terry,
Can you direct me to where I can purchase these installation instructions? |
06-18-2017, 05:47 AM | #8 |
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Re: 39 blower switch
You should be able to print the two pages I posted above. Send me a PM.
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