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Old 07-15-2016, 04:07 PM   #11
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Hard start Capacitors

Think of a capacitor as like a toilet for an electrical charge. Yeah, I know but work with me here. It gradually fills up with electricity when not being used, then when the circuit is closed, it"dumps" the charge in milliseconds for a "jolt" to get the appliance going. It has no effect what so ever on the line voltage before or after discharge. If you have low voltage before, you will most likely have the same voltage after the start.
I installed HSCs on both my A/Cs on my TT and all three A/Cs on my home.
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Old 07-15-2016, 04:11 PM   #12
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My thought is that it might store and supply (boost) enough current on startup to avoid dropping the supply voltage below 104 but I know I'll still need more than 104 volts once the compressor is running, otherwise the EMS will still shut down the power supply.
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Old 07-15-2016, 04:13 PM   #13
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Great analogy!
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Old 07-15-2016, 04:38 PM   #14
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In my post, EMS means Electrical Management System, as in my 30 amp Progressive Industries EMS.
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Old 07-15-2016, 09:48 PM   #15
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The compressor motor is of the inductive type ... when the motor shuts off, there is refridgerant pressure held in the head, which is difficult to over come at start up. The Start Assist capacitor does just that, giving the motor more torque (with the available voltage), for a very brief moment in time and then it "drops out" after its job is done... an induction motor can turn either direction but can't start on its own and needs either an external force ... or better yet, a start capacitor to "direct it" in which way to turn ... it does this by shifting the natural trailing voltage phase forward in time. These capacitors are charged and discharged 60 times a second.
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Old 07-15-2016, 10:31 PM   #16
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to add to this: the A/C system operates with high head pressure (200 psi or more) and lower suction pressure about 65. For this reason it is important for the compressor to remain off for several minutes between cycles. this off time will allow the pressure to equalize and allow the compressor to start much easier.
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