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Old 08-18-2018, 12:39 PM   #1
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Anyone installed a 5 2 1 hard start on their A/C?

Recently after returning to the hot humid Florida from a 2 month trip in our RV in Michigan, I noticed the A/C unit was struggling and I would hear the compressor drop out during the midday.
After inspection the unit on the rooftop, I discovered that one of the screws in the plenum had gone missing (Thanks Indiana and Michigan potholes). The evaporator was filthy from sucking all the unfiltered air in. I did a good thorough cleaning of both coils and secured the plenum well with new screws. The unit is cooling much better, and I haven't noticed the compressor dropping out since.
The duo-therm ducted unit does not include a start capacitor from the factory, though there are provisions for one. I am thinking that after 15 years of service, a kickstart capacitor might be a good addition.

My question is if anyone here has installed a 5 2 1 capacitor kit on their RV A/C unit. I have a pretty good knowledge of refrigeration systems and have installed plenty of hard start kits on residential A/C units, but never on a rooftop RV unit. The 5 2 1 unit says it's for 208/240v systems, but theoretically it should do the job on a 110v system also.

I prefer using a start capacitor with a true potential relay as opposed to the PTC (positive temperature coefficient) that most of the 2 wire hard start kits use as the PTC relays must cool down sufficiently to work, in other words, after the fluid heats up and drops the voltage, it has to cool back down in order to be used again. This can be problematic inside an A/C unit running and sitting in the sun.

With the 5 2 1 or a similar potential relay unit, the current drops once the compressor is running, and it reconnects immediately once it senses the current drop. This way it is ready to go as soon as it is called for next, regardless of temperature.

Has anyone here successfully used one of the 5 2 1 compressor saver kits on their RV air conditioner?
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Old 08-18-2018, 12:49 PM   #2
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I got a aux start cap from granger. Seams to start easier on gen or shore.
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Old 08-18-2018, 01:39 PM   #3
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I got a aux start cap from granger. Seems to start easier on gen or shore.
Do you know the brand or if it has a thermal or electronic switch?
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Old 08-18-2018, 01:46 PM   #4
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Just a capacitor you wire in with the existing. I don't remember which one but found the brand on this forum.
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Old 08-18-2018, 01:51 PM   #5
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Thank you for your response. I did go ahead and order the 5 2 1 Compressor Saver. After it gets here I will certainly post an update as to whether it can be installed on these rooftop units, and if so, how it works.
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Old 08-20-2018, 01:37 AM   #6
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Originally Posted by Brob View Post
My question is if anyone here has installed a 5 2 1 capacitor kit on their RV A/C unit. I have a pretty good knowledge of refrigeration systems and have installed plenty of hard start kits on residential A/C units, but never on a rooftop RV unit. The 5 2 1 unit says it's for 208/240v systems, but theoretically it should do the job on a 110v system also.

I prefer using a start capacitor with a true potential relay as opposed to the PTC (positive temperature coefficient) that most of the 2 wire hard start kits use as the PTC relays must cool down sufficiently to work, in other words, after the fluid heats up and drops the voltage, it has to cool back down in order to be used again. This can be problematic inside an A/C unit running and sitting in the sun.

With the 5 2 1 or a similar potential relay unit, the current drops once the compressor is running, and it reconnects immediately once it senses the current drop. This way it is ready to go as soon as it is called for next, regardless of temperature.

Has anyone here successfully used one of the 5 2 1 compressor saver kits on their RV air conditioner?
I put them on my AC's. What you need to keep in mind is the coil of the relay is matched to the voltage of the start winding. I don't think a 240 volt unit will work properly with a 120 volt supply. I used a Mars 19002 Mars 63 Potential Relay.

Pick up 139 Minimum, 153 Maximum. Dropout Maximum 55

I ran the math and ended up with a a start capacitor of 145-175 MFD 110/125 VAC.

The compressors start with a smooth purr not a bang like the ones at home with the Suppco PTC caps.


Dometic Air Conditioner Capacitor?
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Old 08-20-2018, 10:23 AM   #7
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I put them on my AC's. What you need to keep in mind is the coil of the relay is matched to the voltage of the start winding. I don't think a 240 volt unit will work properly with a 120 volt supply. I used a Mars 19002 Mars 63 Potential Relay.

Pick up 139 Minimum, 153 Maximum. Dropout Maximum 55

I ran the math and ended up with a a start capacitor of 145-175 MFD 110/125 VAC.

The compressors start with a smooth purr not a bang like the ones at home with the Suppco PTC caps.


Dometic Air Conditioner Capacitor?
I appreciate the information, I was unaware of the MARS capacitor. The 5 2 1 is supposed to arrive today, I will do some further investigation before I install it.
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Old 08-20-2018, 04:40 PM   #8
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I put a MicroAir easystart kit on mine. Works great and it is made for RVs and boats. I can run my AC with a Honda EU2000, although I now have an EU2200.

https://www.microair.net/collections...nt=30176048267
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