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Old 04-29-2017, 04:03 PM   #1
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Basement A/C

How do I check to see if Compressor 2 is actually coming on ? and what would I check in area with board and wiring ? have checked breaker all good there , and with Gen running so I can see how many amps its drawing what should that show with 1 and 2 compressors working , haven't found any loose or burnt wires
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Old 04-29-2017, 05:07 PM   #2
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Each compressor probably runs at ~12 -14 amps (according to compressor size) and it spikes higher as it starts up. If you turn off the breaker to unit 1, only unit 2 should run.
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Old 04-29-2017, 05:20 PM   #3
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Each compressor probably runs at ~12 -14 amps (according to compressor size) and it spikes higher as it starts up. If you turn off the breaker to unit 1, only unit 2 should run.


2 does nothing so ill have to dig a little deeper , Thanks
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Old 04-29-2017, 05:25 PM   #4
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You should see ~23 amps with both compressors running. Number 2 won't come on if number 1 compressor is not running. So you can't flip the breaker to number 1 and expect the 2nd compressor to run...
What year coach/model do you have? Have you checked the start/run capacitors?
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Old 04-29-2017, 05:38 PM   #5
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You should see ~23 amps with both compressors running. Number 2 won't come on if number 1 compressor is not running. So you can't flip the breaker to number 1 and expect the 2nd compressor to run...
What year coach/model do you have? Have you checked the start/run capacitors?


I have 1 running and notice no difference with 2 I have a friend who's good with Elec coming over tomorrow to do some checking , are the Capacitors the larger round Grey or the smaller black pieces , 2006 Itasca Ellipse
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Old 04-29-2017, 05:41 PM   #6
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The capacitors are about the size of a tomato paste can. They store large amounts of electricity, even when the power is off and can be a real dangerous shock hazard. There are many YouTube videos available on testing and replacing them.
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Old 04-29-2017, 05:43 PM   #7
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The capacitors are about the size of a tomato paste can. They store large amounts of electricity, even when the power is off and can be a real dangerous shock hazard. There are many YouTube videos available on testing and replacing them.


Will give that a look thanks
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Old 04-29-2017, 05:44 PM   #8
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I have 1 running and notice no difference with 2 I have a friend who's good with Elec coming over tomorrow to do some checking , are the Capacitors the larger round Grey or the smaller black pieces , 2006 Itasca Ellipse
Yes each compressor has a run and a start capacitor so 4 capacitors total. Wouldn't be surprised if your capacitor(s) to the 2nd compressor are toast. They are easily purchased online or through a WGO dealer like Lichtsinn.
Let us know what you discover.
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Old 04-29-2017, 05:52 PM   #9
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Thanks all for the help looks like i need to test capacitors first
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Old 04-29-2017, 10:34 PM   #10
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There are many threads about the Coleman basement heat pump. IMO the best information here is from "Duner" https://docs.google.com/viewer?a=v&p...zBiZTYxYzU5ZWQ
Winnebago basement heat pump: AC under the coach,removal Airxcel RV Products Service locations basement air conditioner compressor Motorhome RV HVAC Controls - Evans Tempcon Start Device Package for Coleman Air Conditioners 8333A9021: Automotive Basement A-C Removal Procedure-Revised 8-24-2013.pdf Coleman Mach 2 Two TON Plus Basement Air Conditioner W/HP 24,000 BTU 46515-811 Basement A/C Removal & Outdoor Blower Replacement Procedure - iRV2 Forums Replacing the Coleman Mach thermostat with an Ecobee Coleman 46515-811 69859 Two Ton Plus Basement Central Air Conditioner 24000 BTU
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Old 04-30-2017, 09:45 AM   #11
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Make sure tstat is set at least 5 deg below room temp.

I would start by checking the 12vdc tstat Y2 cable on the tstat pigtail. This is what signals the #2 compressor to start. If 12vdc, I would then check for 12vdc on EMS circuit board, as the #2 compressor runs thru the EMS. If present, then check for 12vdc on basement pc board.

If the #2 compressor and run capacitor are good, and #2 start capacitor is bad, the compressor should try to start, indicating amps on your panel to go very high for a short period before compressor internal overload trips.

Put tstat in electric heat mode and set temp above room temp and see if #2 starts. In heat mode, all operations are handled by pc board once tstat calls for heat.
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Old 05-01-2017, 01:19 AM   #12
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Rjfox,
Http://bryantrv.com
Has good troubleshooting info.
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Old 05-01-2017, 07:42 AM   #13
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Rjfox,
Http://bryantrv.com
Has good troubleshooting info.


Thanks will have a look
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Old 05-01-2017, 08:50 AM   #14
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My #2 compressor does not turn on under generator power, just under shore power will it kick on.
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