over amping blower assembly

[Tommy1010]

Carrier water cooled omnizone package unit
model 50XCW16AAQG6AA0AA

brand new install

blower motor rated at 4.3FLA...pulling 9.1, tripping safety reset on contactor

remove belt motor pulls 2.5 ?????

motor had rust inside on shaft and around body

called carrier...they sent new motor

same exact result

WTF????

any ideas?

[KB Cool]

Shive correct? Voltage correct? Wired correct?

[Tommy1010]

Shive correct? Voltage correct? Wired correct?

Supply Voltage concerns me a LIL...445v

fan pulley also caught my attention...seems small...but its the standard from carrier..

[Timber]

Moving too much air ?

Are the panels in place ?

[timebuilder]

Are you saying that you have 445 on a 460 unit, or is it something else?

A small motor sheave would not increase your draw. A small blower sheave would.

[Tommy1010]

Are you saying that you have 445 on a 460 unit, or is it something else?

A small motor sheave would not increase your draw. A small blower sheave would.

yes i have 445 on 460 unit

[hvacrmedic]

Check to see if it's single phasing. Was the cover on when you took those amp readings?

[SkullMonkey]

Is the motor rpm correct? Did they send you a 3450 rpm instead of a 1725 rpm?

Check your pulley ratio.

As mentioned above recheck your wiring connections and make sure you don't have a dropped phase.

[Chris_Worthington]

Your pecker head wiring is either wrong or not making a connection

Don't assume because it is nutted that it is making a connection

[jpsmith1cm]

Check amps on all 3 legs.

i don't think that having the panels off would cause that kind of overload.

I'm thinking single phase or wrong motor like someone else said.

[hotrodrob]

The low voltage concerns me. A 460 unit actually is around 480. Now if you have a motor designed to run at 480v and you have 445 your amp draw will increase at the motor to maintain the design rpm. You can play with some fan laws to change sheaves to get your amps down to nameplate but then your cfm would suffer. I would look into the low incoming voltage.

[Dallas Duster]

yes i have 445 on 460 unit

The book says that 414 is the lowest allowable voltage.

[Lightning_Boy]

Check motor windings, check connections and fuses at disco box. Also take your infrared gun and check heat differential across line and load terminals in disco box. Generally anything above 3-4 deg is bad. I would also check continuity in all wires involved with blower. It's behaving like its wrong voltage or single phasingq. Dig in and find the answer!