Mark Lloyd wrote:
On Wed, 4 Jan 2006 15:18:12 -0500, "CBHVAC" wrote:


"Mikepier" wrote in message
groups.com...

Bob wrote:

It depends on your motor. Mine is 1.2 amps.


How many HP is your blower?

Are you sure your not referring to the combustion blower motor?

Ive got a 1/2HP on mine, its pulling about the same...but then, load, due to
the duct design, will play into this, and most people do not clamp a meter
on, close the door, and take a peak reading with the blower under load.



I used a plug-in meter (kill-a-watt) on the furnace power cord, when I
read 6.9A.

Let''s look at it this way:

Ideally, 1hp = 746watts

If a motor delivers 1/2 hp, then its actual wattage will run over half
of this, because the motor isn't 100% efficient at converting electrical
energy into useful mechanical energy.

A half horse blower motor consumes about 400 watts.

On low speed, however, at 230 volt, the amperage draw can run down
around the 1.2 amp region.

On many newer units continuous fan is defaulted to low speed, which is
equivalent to about 1/2 the rate hp of the motor.
IOW, on low speed a half horse motor will be running at closer to 1/4
hp, or thereabouts, or somewhere in the region of 200 watts, and the amp
draw corresponding to this on 230 volts is down around the 1 amp mark.
I've seen them running under 1 amp.

hvacrmedic