| [GMCnet] Soft start for AC [message #327367] |
Wed, 20 December 2017 19:43  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
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Hi Emory,
These soft start boxes are way different from start capacitors. Yes, if the start cap is bad it should be replaced.
These boxes allow a properly functioning roof AC unit to start with half the start up amps of a unit without the soft start box. Since start amps are considerably higher than the amp draw running, they often allow a smaller gen to run the roof AC units.
I use variable frequency drives to power three phase motors on my woodworking equipment to run from single phase power. One side benefit is the user can program the start draw ramp. For example, I run European three phase motors at 50 hz (which they were designed for) instead of 60 hz standard in the US. The result is the motors run cooler, quieter and a bit slower. I often program the ramp to keep the max amp draw below 8 or 9 amps even on 5 HP motors that would draw way more than that on their own.
The technology is similar to that used in these soft start boxes allowing single phase motors running on single phase power to start with a lower amp draw.
Jerry Work
Kerby, OR
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Message: 11
Date: Wed, 20 Dec 2017 17:32:15 -0700
From: Emery Stora
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Soft start for AC
Message-ID:
Content-Type: text/plain; charset=us-ascii
Often a failing or failed motor start capacitor will cause the problem. Replacement of a bad capacitor is a much cheaper fix.
Emery
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] Soft start for AC [message #327434 is a reply to message #327367] |
Sat, 23 December 2017 10:23  |
Scott Nutter
Messages: 781
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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With a soft start installed, would the noise level of the compressor on start up be less than without the soft start?
Might be good for AC's installed in the bedroom if it is quieter. I know the low profile Coleman's can be a little noisy on compressor startup.
Scott
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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| Re: [GMCnet] Soft start for AC [message #327441 is a reply to message #327434] |
Sat, 23 December 2017 18:33 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Scott Nutter wrote on Sat, 23 December 2017 11:23With a soft start installed, would the noise level of the compressor on start up be less than without the soft start?
Might be good for AC's installed in the bedroom if it is quieter. I know the low profile Coleman's can be a little noisy on compressor startup.
Scott
Scott,
The poly-phase motors I have are an much nicer start, so I would guess so...
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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