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Old 05-28-2016, 07:46 PM   #1
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Hard Start Capacitor

hi,
i was on the phone with a service man at airxcel and mentioned that i put a hard start capacitor on by coleman-mach 3+ac. he jump in saying not to do this because it will shorten the life of the ac. "we would of added it if we felt it was needed". yet the schematic on the ac panel shows a hard start in a dotted outline connected to the run capacitor. so i am really confused about the capacitor i just added. what is the bottom line about adding the hard start?
thanks in advance
russ
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Old 05-28-2016, 08:05 PM   #2
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Originally Posted by RMFrawley View Post
hi,
i was on the phone with a service man at airxcel and mentioned that i put a hard start capacitor on by coleman-mach 3+ac. he jump in saying not to do this because it will shorten the life of the ac. "we would of added it if we felt it was needed". yet the schematic on the ac panel shows a hard start in a dotted outline connected to the run capacitor. so i am really confused about the capacitor i just added. what is the bottom line about adding the hard start?
thanks in advance
russ
The service man doesn't know beans from bull foot. Is he going by feelings... aw, that's nice!

There are optional "start assist" called hard start capacitors available from all the major brands and as you noticed, even shows them in the wiring diagram at the unit. I used a generic brand - Supco SPP6 - bought from Amazon and it works great. I got it for times when in the hot south, campground volts drop almost too low and the AC start up can cause a breaker to trip, but is way better with the capacitor added; the added torque at start up has to extend AC life rather than shorten it.
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Old 05-29-2016, 08:27 AM   #3
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This is a very timely post for me. I'm having the same problem here at Darlington Provincial Park this weekend. Voltage at the post is 110 - 111V. I'm drawing 4 amps with just the bathroom fan on and when the AC kicks on it drops down to around 103 - 104V and within seconds the PI EMS shuts down power with an E4 error (low voltage). First time I've had this at a Provincial Park. I may have to add a hard start capacitor and a delay switch.
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Old 05-29-2016, 08:39 AM   #4
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Hard Start Capacitor

If your voltage drops to 104V while running a capacitor will not stop the ems from shutting down. The starting capacitor only helps at startup. I would talk to the ranger to see if you have a bad connection at the post.
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Old 05-29-2016, 09:25 AM   #5
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If your voltage drops to 104V while running a capacitor will not stop the ems from shutting down. The starting capacitor only helps at startup. I would talk to the ranger to see if you have a bad connection at the post.
X2

What you might be able to do is switch the WH and fridge to gas and turn off as many 120vac devices as you can.

What you might want to look into is an adapter like the link I posted. I bought one from a member here (Turbs) for way less $$$. The idea if WHEN YOU HAVE 50 amps, you can chose which side (L1 or L2) has the highest voltage... and plug your 30amp into it... I was surprised how different on side (phase) can be from the other. Plus the 50 amp receptacles are not as worn and loose as the 50 amp (typically).

http://www.amazon.com/Conntek-Adatpe...amp+rv+adapter

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Old 05-29-2016, 09:34 AM   #6
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I had the park Technician here yesterday afternoon and he wasn't any help. There are no 50A services at any Provincial Parks so the adapter wouldn't help. This morning just turning on the electric kettle trips the EMS and it didn't last night. Other campers must be using a lot of power during the day. Since it’s Sunday I expect that many campers will be leaving today so I'll check some other site posts to see if they all read the same.
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Old 05-29-2016, 12:04 PM   #7
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Hard Start Capacitor

It is hot for southern Ontario this weekend, so I would guess that a lot of campers are using there AC. I can say I have never been to a campsite that had 50Amps on it.
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Old 07-15-2016, 03:15 PM   #8
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Sorry to revive this older thread....

Will a hard start capacitor reduce the voltage drop when the AC starts up? With around 110 volts at the post I'm hoping that once the initial startup is completed the voltage will stay above 104 volts.
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Old 07-15-2016, 03:51 PM   #9
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A start capacitor will help a compressor get moving but will not make any difference in the supply voltage once the compressor is running.
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Old 07-15-2016, 03:57 PM   #10
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I am not sure about voltage increase/stabilization... start capacitors are intended for motors that don't have the start windings(I know i will be corrected) or the same type of windings as a part start motor. I do know if the motor is working correctly you would not need a start capacitor to assist. Will it hurt anything? Prolly not. I would add a start assist kit and not look back, because if it needs it, then there already is a problem.
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