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Old 06-17-2014, 12:03 PM   #29
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"The last failure situation is the valve stuck somewhere between cycles, which is usually a difficult situation to diagnose. The valve slide position is such that the net result is a significant amount of leakage between low and high side pressures, producing symptoms of a faulty compressor…high suction and low head pressures."

http://wayneshirley.wordpress.com/20...ersing-valves/
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Old 06-17-2014, 12:04 PM   #30
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Quote:
Originally Posted by Jammer View Post
Was out camping in Western Minnesota this weekend in 90+ degree temps, full sun, no shade, and wind, and could not keep the traylah cool with both A/Cs blowing. Rear A/C was keeping the bedroom cool but front part of the trailer was still 84 degrees.

Is this is as good as it gets or do I have an A/C problem? Front A/C was blowing on high fan, measured outlet temps in low 70s, inlet in high 80s.

Exact same experience with my 2011 30" Classic with one 13,500 in the bedroom and one 15,000 in the main living space. Opening Awnings does help but.....

I have two 13,500's with the Couch within 35 feet of living space and two bump outs, hoping the ducted A/C works a bit better....
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Old 06-17-2014, 12:07 PM   #31
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Quote:
Originally Posted by Jammer View Post
Some measurements I took that may be helpful to others.

118v supply voltage under load.
88 degrees F. ambient temperature. Windows open, same temp in and out.

Rear A/C appears to be working properly. 13,500 BTU Dometic Penguin with R-410a:
Low fan 2.8a
High fan 3.4a (nameplate 3.5a)
High cool 10.0a (compressor only) (nameplate RLA 12.5)
Outlet temperature 64 degrees, 24 degrees below inlet

Front A/C (insufficient cooling). Dometic "high capacity," also R-410a.
Low fan 2.3a
High fan 2.7a
High cool (compressor only) 7.8a
Outlet temperature 74 degrees, 14 degrees below inlet.

Readings were taken one unit at a time after each unit had been operated for several minutes to allow it to stabilize.

I didn't photograph the front unit's nameplate so I'm unsure of its ratings. Dometic's web site shows 13.4 RLA for the compressor and 2.6 for the fan, but I know that there can be some variation depending on production date.

The trailer is at a Dometic service center now and I'm trying to get Dometic to cover repairs or replacement under warranty.

With a compressor amp draw of only 7.8A, you have lost refrigerant and need a replacement unit.
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