How to mod a heat gun to blow cold?

IIRC some of these use the heat element to drop the motor voltage via a tap so you are SOL on this.

Yes, I understand whatg you are saying.

However, I have a hair dryer with a cold setting.

It should be the same principle.

Yes, I understand what you are saying.

However, I have a hair dryer and it has a cool setting.

It should be the same principle asmy heat gun.

Why?

A hair dryer wants the cool setting, so they design it that way.

There is no conceivable reason why a heat gun would need a no-heat setting. It's purpose is to generate heat, and nothing else.

If you want a fan with no heat, then use the hair dryer.

I would also suggest that no heat is not the same thing as cooling. Turning off the heat element in a heat gun is just a fan, sort of some cooling effect but nothing dramatic.

The opposite of a heat gun would be a bun with a fan and some sort of cooling element.

Michael

A conceiveble way; use the heat gun to roast coffee.

(Google heat gun roasting.)

The 'cool' setting allows one to cool the beans.

Cooling means to lower the temperature from where it is, not necessarily below RT.

A helpful suggestion would be preferable to criticizing the question.

Many times the most helpful suggestion is to criticize the question. However try a 4.7K resistor and measure the voltage on the motor. That'll be a clue to the best value.

That's a prett5y good idea.

Thanks.

BTW can you please explain how the heating coils control the voltage/current to the motor?

I assume (perhaps incorrectly) that the 13 Amps going through the coil do not also go through the motor.

Yep

Yep. The heating coil drops 120 VAC over its length. There is a tap at, say,

15 VAC. This feeds the rectifiers and the motor. Older models used a 120 VAC motor but this is cheaper.

Just like the dropper resistors in the heater chain of an old AC/DC tube radio.

I have to check my heat gun - it's been a while since I've used it - due to too many other projects not requiring it. Anyway, I "believe" MY heat gun "did" come with a "cool" setting. I'll let you know. IF IT DID, I'll give you the make of it. But in the mean time, I "think" I bought it from MCM electronics, if I'm not mistaken. Though they may not sell "that" model anymore.

Mine has a cool setting which I've only ever used to cool down the heat gun before putting it away, still I've managed to melt some stuff to the metal barrel. It uses an AC fan motor.

O.K. I understand the tap at ~15 Volts. The low current (~ 100 Ma) does not load the parallel tap. However, how do you run the fan motor with the coil not supplying heat?

I do not see a resistor in my 1600 Watt hair dryer which has a push button cool switch.

AAMOF The cool postion of the hair dryer is a little warmer body temp (some coil heat).

One way to achieve a cooler air stream is to series connect the 2 coils.

Higher resitance coil - low Heat. Higher ressistance and lower resistance coils in parallel for max heat. (or just use lower resistance coil by itself) Both coils in series for mostly fan.

Maybe you have an AC motor?

Or a 120VDC motor, I've seen them in paper shredders.

Nope. A 4 diode bridge.

In article , snipped-for-privacy@aaronj.com (known to some as snipped-for-privacy@aaronj.com) scribed...

Point of interest: The Ungar 6966C heat gun has both 'Hot' and 'Cold' settings designed right in.

Happy heating.

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