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 > Coleman-Mach 48008-966 AC large voltage drop

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dougrainer

Carrolton, Texas

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Posted: 05/25/22 01:39pm Link  |  Quote  |  Print  |  Notify Moderator

Remember, he stated NO PROBLEM on HP mode. And same problem on CG and Genset power. Doug

Skibane

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Posted: 05/25/22 02:58pm Link  |  Quote  |  Print  |  Notify Moderator

valhalla360 wrote:

Skibane wrote:

...


This is likely your issue (might be compounded by marginal park voltage which will result in higher amperage draws and amps are what triggers the breakers to trip.).

Newer electronic thermostats have a delay built in, once the compressor shuts off, it won't allow it to start again for a few minutes. This allows the pressure to drop allowing the compressor to start more easily.


"Anti short-cycle" timers are also commonly sold for retrofitting A/C units that weren't originally equipped with this feature - Example here.

dougrainer

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Posted: 05/25/22 05:06pm Link  |  Quote  |  Print  |  Notify Moderator

Skibane wrote:

valhalla360 wrote:

Skibane wrote:

...


This is likely your issue (might be compounded by marginal park voltage which will result in higher amperage draws and amps are what triggers the breakers to trip.).

Newer electronic thermostats have a delay built in, once the compressor shuts off, it won't allow it to start again for a few minutes. This allows the pressure to drop allowing the compressor to start more easily.


"Anti short-cycle" timers are also commonly sold for retrofitting A/C units that weren't originally equipped with this feature - Example here.


I doubt this would work on a RV Mechanical tstat controlled system. The link refers to a 1.5 amp MAX current thru. The RV AC mechanical control tstat will be susceptible to the current load that the compressor pulls(up to 18 amps short milliamp load). The link shows a system that would be on the smaller(16 to 22 gauge) wires of a wall thermostat(24 volt) like in a house. RV wall tstat have a upper control board that is where the time delay is. The time delay is not on the wall tstat. Doug

dougrainer

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Posted: 05/25/22 05:08pm Link  |  Quote  |  Print  |  Notify Moderator

To the OP, MAKE SURE THE COLD TEMP SENSOR IS INSTALLED IN THE CORRECT AREA OF THE RETURN AIR PLENUM. If it too close to the evap it will cause short cycling. Also, if the separation plenum gasket is NOT installed correctly or has air leaks(will be cold air flowing to where the temp sensor is), that will also cause short cycling. Doug

dougrainer

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Posted: 05/25/22 05:18pm Link  |  Quote  |  Print  |  Notify Moderator

https://www.airxcel.com/DesktopModules/RvProduct/Pdf/r593.pdf

Is this your plenum assbly? Doug

dougrainer

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Posted: 05/25/22 05:20pm Link  |  Quote  |  Print  |  Notify Moderator

https://www.airxcel.com/rv/coleman-mach/........vice-support/document-library?docId=6407

Or this one? Doug

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