Basement A/C Power Circuit Dead

[testcommercial]

This is a 2006 Alfa See Yas Founder Edition. The RV Products basement a/c two stage unit has no power at circuit 2. The breaker is not tripped and there is power coming out of the breaker.

Does anyone know if there is a junction box where the wiring from the a/c unit meets the wiring from the breaker panel.

[lmsooter]

You have probably checked but I will ask anyway.  On my 06 See Ya, there is a switch in the electrical bay where the power cable comes in. It is labeled 30 amp and 50 amp.  If it is set at 30, the second compressor will not run.

[manholt]

Or if your not (pedestal) hooked up to 50A.  I had a 07' Winnebago Tour...same system.

[BillAdams]

When plugged into 30 amp power you would still have power on both circuits.  The OP also says that there IS power coming out of the breaker.  I don't know if that's a 50 amp breaker or a sub-panel breaker for the A/C but it if there is power on both circuits it is not likely a campground power issue.

[lmsooter]

testcommercial,

 

Here is an explanation of the 30/50 amp switch.  Don't remember exactly where I got it but probably on one of the Alfa forums on Yahoo.  As you can see, with the switch in the 30 amp position, no power is available to the #2 compressor.

You do not have to change the 50/30 amp switch to 30 amps, just because you are connected to 30 amps shore
power. The 30/50 amp switch is probably one of the highest on the list of misunderstood items on our coaches.
50 amp service provides 2 legs of 115 volts AC at 50 amps per leg so in reality the coach has 100 total amps
available.
The AC loads in the coach are divided between the 2 legs.
One compressor is on leg 1 and the other compressor is on leg 2.

When one uses a proper 30 amp to 50 amp adapter to connect to a 30 amp shore power source the adapter
connects the 2 legs of the coach to the one 30 amp leg. The coach how has a total of 30 amps available instead of
100 amps.

The 50/30 switch is merely a double pole double throw (DPDT) toggle switch. AC Leg # 2 is connected to the switch
along with Compressor # 2. In the “50 Amp” position Compressor # 2 has power regardless of if you are connected to
50 amps, 30amps or even 15-20 amps as long as the approximate adapters are used.

The “30 Amp” position disconnects Compressor # 2 from AC Leg # 2 again regardless of the shore power ampere source.
The compressors are staged in coming on, that is, compressor # 1 starts first and then compressor # 2 starts. Among
other things this permits both compressors to be utilized even when connected to 30 amp shore power provided that
the 50/30 amp switch is in the 50 amp position and one manages the AC loads properly. For example switch the hot
water and refrigerator to propane and do not use the microwave while the compressors are running. If one needs to
use the microwave simply turn the thermostat to off while running the microwave.

**** Albritton has a kit available that uses the unused connections on the 50/30 amp switch to connect Compressor #
2 to a separate AC power source. If a separate 30 amp or 15 amp 115 V AC circuit is available then the Compressor
# 2 will be connected to it with the 50/30 Amp switch in the 30 Amp position. The advantage of the kit is now you can
run the refrigerator and microwave while the compressors are running. Most likely the hot water heater will still have
to be on propane. One word of caution is that many places wire the 20 amp outlet to the same circuit breaker that the
30 amp is connected to. When this is the case you still have only 30 amps instead of the expected 30 amps plus 15-
20 amps.