Aprilaire 5000 operation light

[quid_non]

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

[quid_non]

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?

[webbheat]

Yes it is specified in insulation manaul of current relay, sell lots of these units and never had any of these problems.

[cmajerus]

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)

[cmajerus]

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.

[billva]

Why not use a sail or air pressure switch?

[dngtig]

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.