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  1. #14
    Quote Originally Posted by webbheat View Post
    Wrap the motor wire three times around metal strap on 51 relay and your problems will be taken care of.
    Thanks for the reply - I'm confused, If the relay specification says it needs a minimum of 4 a to activate, and the blower only draws 250mA (max) at hi speed, how will wrapping the strap compensate for the current loss?
    Thanks

  2. #15
    Quote Originally Posted by mark beiser View Post
    The furnace control board should have an accessory terminal to supply 115v when the blower is running.
    Thanks - that would likely work - any suggestions on what the terminal might be labelled or where to look for that take off?

  3. #16
    Join Date
    Jan 2004
    Location
    Northen West By God Virginia
    Posts
    72
    Yes it is specified in insulation manaul of current relay, sell lots of these units and never had any of these problems.

  4. #17
    Join Date
    Aug 2007
    Location
    MN
    Posts
    2,677
    Quote Originally Posted by quid_non View Post
    Thanks - that would likely work - any suggestions on what the terminal might be labelled or where to look for that take off?
    its marked accessory (acc)
    You can't fix stupid

  5. #18
    Join Date
    Aug 2007
    Location
    MN
    Posts
    2,677
    Quote Originally Posted by quid_non View Post
    Thanks for the reply - I'm confused, If the relay specification says it needs a minimum of 4 a to activate, and the blower only draws 250mA (max) at hi speed, how will wrapping the strap compensate for the current loss?
    Thanks
    actually most vs drive blowers I have checked amp draw on show about 1- 1 1/2 amps with the clamp on. every wrap of wire creates a transformer like increase in amperage to fool the relay into thinking there is a higher ampdraw.
    You can't fix stupid

  6. #19
    Join Date
    Feb 2004
    Posts
    2,597
    Why not use a sail or air pressure switch?

  7. #20
    Join Date
    Jun 2006
    Location
    Southeastern Connecticut
    Posts
    839
    The internal air flow switch on the Model 5000 was discontinued after the first year or two. The model 51 relay comes with the air cleaner and usually work well.
    quid_non, wrapping the wire multible times is the correct way to make it operate. If your blower is drawing 2 amps, running the wire through the clamp twice will now double the amps it reads.

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