Hard start kit opinions.

[suBcools]

Agreed, very good information. Thanks for posting that.

Sent from my PG86100 using Tapatalk

[alex13177]

anybody use the starter pow-are-paks with any problems?

[Cooked]

.......2. loose wires on the peckerhead.......

I resemble that remark and find it highly offensive.

[timebuilder]

Yeah if I can find them near me! Plus I guess they are not advised for scrolls so that is another issue.

I think the "not advised" wording is a little misleading.

What the scroll guys are saying is that because a scroll starts basically unloaded, there should be no need for a start assist device. However, there are times when one is indeed indicated. The scroll motor is electrically identical to a recip motor. Only the method of compression is the difference when it comes to loading on startup.

[Glennhvac]

I think the "not advised" wording is a little misleading.

What the scroll guys are saying is that because a scroll starts basically unloaded, there should be no need for a start assist device. However, there are times when one is indeed indicated. The scroll motor is electrically identical to a recip motor. Only the method of compression is the difference when it comes to loading on startup.

I admit some ignorance on the internal mechanics of the scroll compared to a recip. I think what I gather by 'unloaded' is that they can and will start easier than a recip under the non equalized pressures you find so often with the new txv coils?

[Paul Bee]

There are a lot of informative videos on youtube, just search refrigeration compressors. I also like the 5-2-1.

[timebuilder]

I admit some ignorance on the internal mechanics of the scroll compared to a recip. I think what I gather by 'unloaded' is that they can and will start easier than a recip under the non equalized pressures you find so often with the new txv coils?

It's a smoother, more gradual start because the scrolls take several revolutions to build a pressure that is greater than the discharge line pressure, whereas a recip builds that pressure in a stroke or two of the pistons, which is often one or two revolutions, so the load on the recip motor is much steeper from rest to running at RLA.

[Glennhvac]

Thanks for all the feedback , help and advice. I really had not heard of those 3-2-1 kits and hope to find a parts place around me that handles them. I also hope there is enough room in these downsized control sections to install them.

[mark beiser]

I admit some ignorance on the internal mechanics of the scroll compared to a recip. I think what I gather by 'unloaded' is that they can and will start easier than a recip under the non equalized pressures you find so often with the new txv coils?

The internal pressures on the pumping mechanism in a scroll compressor equalize nearly instantly when it turns off because there are no discharge or suction valves to prevent it.
There is a check valve in the discharge outlet of the compressor shell to prevent the system pressures from equalizing through the compressor, but there is no pressure difference across the actual pumping mechanism, so scroll compressor always start fully unloaded.

TI really had not heard of those 3-2-1 kits

"5-2-1"

[Glennhvac]

The internal pressures on the pumping mechanism in a scroll compressor equalize nearly instantly when it turns off because there are no discharge or suction valves to prevent it.
There is a check valve in the discharge outlet of the compressor shell to prevent the system pressures from equalizing through the compressor, but there is no pressure difference across the actual pumping mechanism, so scroll compressor always start fully unloaded.



"5-2-1"

Today was good! I learned this. Thanks

[SoFlaDave]

Another 5-2-1 Convert here. No more kickstart for me. Still use OEM kits for Trane stuff whenever possible though

[JWB]

so I meter the start caps when diagnosing and find some of them bad, I sometimes reuse the existing pot relay and just change the cap. Keep some in my van. Usually the relay is still good. Anyone object to this, I am talking about getting a compressor up and running when it just won't start.......meter goes up and then down on a start cap, I crimp a terminal end on the resistor and reconnect to the terminal when done. What would happen if the resistor was left unattached?

[jnsrose]

I guess I will be throwing away all my super boost. Great thread. This is why I am here every day. Very informative. Thanks for all the info gentleman.