ReplyYes and yes... kick start
Professional Member
On a txv system with a recip. compressor do you need a start capacitor?
On a scroll compressor with a txv do you need a start capacitor?
Professional Member*
Yes and yes... kick start
God Speed, Jim. We'll miss you - 2-26-23
Scrolls don't need a start cap.
But it doesn't hurt if they have one.
Professional Member*
beenthere is right
Regular Guest
Do I have this confused, mostly I hear about using a "hard start kit" with a txv, and all compressors us a combined run/start cap don't they?
Professional Member*
txv + hard start kit = mostly, but not always
all compressor use combined run/start cap - nope
Professional Member*
have never put start kit on scroll compressor. 99.99% of my units are lennox scroll units with txv. have been using scroll units since they came out around 1990.
Professional Member*
The refrigerant does not equalize when a reed compressor is matched with a txv, therefor the compressor starts under a load... ya need a kick
I was was wrong about the scroll. I should have yep and nope.
Professional Member*
Ruud and Rheem puts one on "every" one of there 14 seer units must be doing it for some reason, or it could be maybe they just like to spend the extra money, yea thats it.Originally posted by t527ed
have never put start kit on scroll compressor.
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Professional Member*
Originally posted by mrbillpro
Ruud and Rheem puts one on "every" one of there 14 seer units must be doing it for some reason, or it could be maybe they just like to spend the extra money, yea thats it.Originally posted by t527ed
have never put start kit on scroll compressor.
have never seen or put one on a lennox unit. maybe they are using different txv's???? as i said i have been installing lennox units with scrolls since 1990. to date i may have had 6 compressor failures.
Professional Member
I think I undestand the reason for a "hard start kit" for 14 SEER units with a TX valve based on coments from here.
I was taught that a hard start kit was a bandaid for worn compressors essentially on their way out.
Why arent NEW high SEER units designed with a cap or compressor to handle the designed start up load?
Old compressor technology?
Just wondering...
God Speed, Jim. We'll miss you - 2-26-23
Recip compressors for A/C, H/P applications are made with low torque starting motors, Even with a TXV that equalizes most of them need a start cap.
Start, run caps are seperate things. Duel caps are run caps for both the compressor and fan.
Professional Member
thanks for the comments
Professional Member*
I have noticed that "most" of the high end scroll systems now come with a "start kit".
Life is too short, Behappy!
TFMM
Professional Member*
You were taught wrong.Originally posted by riderman
I was taught that a hard start kit was a bandaid for worn compressors essentially on their way out.
Training is important!
Practical Training is a must!
Professional Member
You need a hard start if:
1. Hard shut off TXV
2. Long Lineset
3. Low ambient conditions
4. Voltage problems
Dave in NJ
God Speed, Jim. We'll miss you - 2-26-23
Scrolls start with out hard start kits even against non bleed TXV's.Originally posted by smadave
You need a hard start if:
1. Hard shut off TXV
2. Long Lineset
3. Low ambient conditions
4. Voltage problems
Dave in NJ
Professional Member
The truth of the matter is, a start kit in most scroll applications is a bullet point or a selling feature. Its something that can be added to a spec to make the use of lower end equipment require adding to. Now, if you are going to run these obnociously long linesets, it's something you might add to a scroll, but in fairness, its not required often at all. In reality, the money would be better spent on LPS, HPS, CCH, and even Driers.
Yes, some recips with non-bleed TXV's need start componants, but even the Benchmark Recip, has built in features that can overcome that need.
Regular Guest
Yes, residential scroll compressors do have capacitors in which specifications are found in Copeland Electrical Handbook 2005-2006 Edition.
[Edited by smithone on 07-23-2006 at 04:02 PM]
Regular Guest
as per mfg recommendation. all scrolls and receips should have a hard start kit installed. scrolls and receps are equiped with non equalizing txvsand a start cap is therefore recommended on both. checkvalve in compressor prevents bleeding back and balancing pressure on the scrolls.
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