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Originally Posted by Slatts

Hey max, if that were the case the motors would be hot.
Measure the voltage across the terminals of the motors.
If it reads 0V test it to earth.
If it reads 110 or what ever you blokes use over there then you don't have a neutral.
If you read 110V across the motor terminals and it's a single phase 110V motor, it's open circuit.

I think basically more info is needed about the job.
How about it mcairrepair?
Had any luck yet?

EDIT: well that was embarrassing. I just realised that maxwell123 was a spammer.

Slatts.

Nothing like a good jolt to get you going in the morning!

Originally Posted by Joe Harper

See his other posts. He might need to be supervised.

You Think.



Mcairrepair

Currently you’re working on live voltage. Are you wearing the proper PPE for this job?

We all know what the problem is but the rules prevent us from giving you the answer here.

Please get your post count up. Then we can answer all the questions your going to have.

Learning by mistakes is a good education but with electricity it can be deadly.

Originally Posted by wannafreeze

The other likely scenario is, you are not a refrigeration technician.

See his other posts. He might need to be supervised.

Originally Posted by mcairrepair

I apologize if this is not the right section of the site to post this and that its not in the pro forums but regardless, if you guys could help me with this that would be great. I have a walkin freezer with two condenser fans one on a thermostat both not running. There is power to both, the run capacitors are fine by capacitance check, bearings spin freely, the motors are cold to the touch and the windings have measurable resistance. Any ideas?

Make and model # would help. Some Units have fuses that could have blown.

Hey max, if that were the case the motors would be hot.
Measure the voltage across the terminals of the motors.
If it reads 0V test it to earth.
If it reads 110 or what ever you blokes use over there then you don't have a neutral.
If you read 110V across the motor terminals and it's a single phase 110V motor, it's open circuit.

I think basically more info is needed about the job.
How about it mcairrepair?
Had any luck yet?

EDIT: well that was embarrassing. I just realised that maxwell123 was a spammer.

Originally Posted by smilies

Is everyone on the same page on the location of "condenser fans"?

I know condenser as being outside the box, but with the mentions of thermostat controls, makes me wonder what fans the OP is actually talking about. The walkins I've dealt with have all refrigeration components accessible from outside the box, including all the fans...

Is everyone on the same page on the location of "condenser fans"?

If you are measuring the voltage at the correct points, meaning right to the motors, and tried a good capacitor for assurance, then the likely scenario is, one motor was out for a while; the manager thinks both motors were running; while one of them was actually running and the second one was just spinning from the draft; when the second motor failed too, you got called.

The other likely scenario is, you are not a refrigeration technician.

Are you talking about the fans inside the box or outside the box? If they are the ones inside the box, then the following may be of help.... The walkin freezer at my last job had 2 fans inside the box. They were always "hot." However, on the coil on the inside of the box, there was a small thermostat, bout 3/4" in diameter and about a 1/2" thick. The thermostat switched the neutral. If the coil temp was warm, the thermo would open the neutral circuit and shut the fans down. The interior fans may not run until the interior coil gets cold to prevent the fans from blowing water into the box.

If its the fans on the outside of the box, I would think they would switch on and off with the compressor. Check the wiring, and check the windings for opens and shorts

Originally Posted by Joe Harper

You can have voltage, but no current flow. Did you check the points on the contactor?
Is this a single or 3 phase unit?

Say it ain't so Joe!

You dont have enough conductor to carry the flow required to spin the motor, but enough to get a voltage reading. Many a tech has cursed at a contactor that they got a voltage reading off of only to find this out.

Originally Posted by Joe Harper

You can have voltage, but no current flow. Did you check the points on the contactor?
Is this a single or 3 phase unit?

If the windings are not open or grounded, how could you have voltage with no current flow? Is this a bad path to ground(nuetral) type of problem?

Fan motor chilly

Is this a mac 8 or mac 9 unit on top of a McDonalds??

When you say you have power to both fans, where are you measuring the voltage, between live (hot) and neutral or live (hot) and earth (ground)? And you say that you've checked the run capacitors... what about the start capicitors?

If you have voltage between the live (hot) and neutral terms and the start capacitors and windings are sound, then the motors should run. The only other thing that could stop them from starting is the centrifugal switch could be jammed open or its contacts badly worn, if its an older type motor. But if this was the case the run windings would get hot but you say that the frame is cool.

Are you sure that your checking you have voltage in the right place? I had a customer who said the same thing. And it turned out he was using a volt stick, and couldn't understand that they only measure dense flux adjacent to a live conductor. It turned out there was a loose neutral in the terms box.

You can have voltage, but no current flow. Did you check the points on the contactor?
Is this a single or 3 phase unit?

thermostat

Only one is operated by thermostat. And besides, there's proper voltage at the motors. the manager said it stopped working when it started raining two days ago. Its still raining now, but I have a cover over the unit now.

Thermostat faulty

condenser fans not running on walk-in freezer

I apologize if this is not the right section of the site to post this and that its not in the pro forums but regardless, if you guys could help me with this that would be great. I have a walkin freezer with two condenser fans one on a thermostat both not running. There is power to both, the run capacitors are fine by capacitance check, bearings spin freely, the motors are cold to the touch and the windings have measurable resistance. Any ideas?