Compressor start problems.

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  #1  
Old 09-18-20, 05:31 PM
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Compressor start problems.

I live in an apt complex, spit unit AC.
Four brand new units were installed. Mine seems to be the only one with a problem. When the outside temps are 105-110 or hotter (Phoenix) the compressor doesn't start right away, sometimes for up to 15 mins. This progressed to where the compressor would shut off and back on repeatedly until the set point was reached. It then started blowing fuses. Then the compressor burned up, arcing and smoke. With new compressor, back to delay in starting when hot outside.
They have replaced just about every component. They did find three of the units on one circuit resulting in low voltage, 206 volts. They think this is the problem.
When the temps are under 105 the compressor starts just fine.
What component would be this sensitive to heat to not allow the compressor to start right away?
 
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Old 09-18-20, 05:42 PM
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Welcome to the forums.

What component would be this sensitive to heat to not allow the compressor to start right away?
The compressor.

You said the units were starving for power.
Has that been corrected as that will cause the damage ?
 
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Old 09-18-20, 05:50 PM
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I don't think it has been re-wired yet.
I can see low voltage causing damage but how would the outside temp play a part?
 
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Old 09-18-20, 06:08 PM
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If the compressor was starved for power or the condenser fan was running too slow and couldn't cool the unit.... the compressor would shut down on thermal overload.
 
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Old 09-18-20, 06:18 PM
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But wouldn't that happen only if the unit was already running?
This is happening when the system first kicks on when it's over 105 but not under.
 
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Old 09-21-20, 07:25 AM
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If the electrical issue hasn't been fixed, then what's most likely happening at 105+ degrees is a large power draw from all the units running is still lowering the available power to start your unit. Your electrical supply might be at the end of the line, so you're the one experiencing the most loss. 206 is definitely on the low side for A/C equipment.
 
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