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Old 04-29-2019, 01:58 PM   #1
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A/c wiring

Have a 2011 FR Berkshire 390RB. Curious to know if rear unit is wired to handle a 15000 BTU A/C w/heat pump as replacement for 13500 non-HP that manufacturer fitted. Or, will I have to have some rewiring done?
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Old 04-29-2019, 02:03 PM   #2
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Good question.
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Old 04-29-2019, 02:09 PM   #3
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Have a 2011 FR Berkshire 390RB. Curious to know if rear unit is wired to handle a 15000 BTU A/C w/heat pump as replacement for 13500 non-HP that manufacturer fitted. Or, will I have to have some rewiring done?
You shouldn't have a problem at all the wire is going to be the same size if it's 13, 500 or 15000, the HP will not pull anymore amps. I say that being it dosent have a heat strip for the defrost cycle. If you add a heat strip you need to figure the amps with both running in the defrost cycle , think full loaded amps plus the heat strip. Normally they do not have a heat strip.
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Old 04-29-2019, 02:29 PM   #4
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I wasn't worried about power draw, I was wondering about control wires for the heat pump.
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Old 04-29-2019, 03:10 PM   #5
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I wasn't worried about power draw, I was wondering about control wires for the heat pump.
It depends, normally a.c. has 4 wires, if it's dometic the brisk air has 3 and the switching is done at the unit ciructt board, if anything you only adding a reverse valve wire, count the wires to your stat. Could have 4 wire ran or 6 wire ran.we know it is at least 4 wire. You have to check each manufactor. The stat Subbase could also do the switching in heat mode, it all depends on the unit and the stat.
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Old 04-29-2019, 03:24 PM   #6
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I also say this being when we ran new stat wire if it took 4 wires we used 6 strain ,if it took 6 like a home hp we ran10 strain. But as you know this is the RV industry there going as cheap as possible. So you just need to check it out, depending on manufactors as I have stated.
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Old 04-29-2019, 03:54 PM   #7
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If you know the model of the stat... you could look up a wiring schematic and figure it out.
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Old 04-30-2019, 06:45 AM   #8
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Thanks for the responses. Safe travels everyone.
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