I put R-134 in my Coleman Roof top AC unit. I found out a month later i needed to use R-22. Will the R-134 damage the unit? the unit was empty when i filled it with r-134. any suggestions.

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That should be a 30,000 Btu unit. Its been a while since I worked on them. The 78 is the series or model, the 30 is the capacity or btu's and the 901 indicates it is a Copeland compressor.

The limiting factor is the power available to run the device. Typically, roof air units are around 12,000 BTU.

Unless your rig is wired with a 50 amp service, you will not be able to run more than you have at the present with your 30 amp service. I have found that a rig with a microwave, a roof AC and a TV frequently cannot run all three at the same time. If you do have 50 amp service, you can add the second roof air. Also, if you have a 30 amp service, you can upgrade to 50 but that is an expensive proposition with the cord itself costing around $200.00. You would also have to upgrade the distribution panel and probably have a pro properly split up the load between the two 120 Volt AC buss'.

I hope this response helps you with your deliberation and thanks for your question @ FixYa.com

Hi, I would have to say you have R-22 in this system. 134-a is for autos and some refrigeration commercial units. R-410-a is for the new residential units. and is a very high pressure freon. So, yes yours is R-22.
Sincerely,
Shastalaker7
A/C, Heating,

Either you need to replace the square gasket between the ac and the roof or you need to seal/replace your roof..

Fairly easy. The only thing that you must figure out is how many amps the heat strips will draw. Make sure the fuses and the breaker switch can handle them. And be aware your electric bills will shoot up.

Sounds like you have either a bad fan motor or a bad fan motor capacitor. When you turn the unit on with the fan not working, the compressor (the humming noise) runs and gets real hot real quick resulting in the compressor cutting off ( the nothing after) on it's inside high temp switch. This is what the compressor is designed to do so that when this happens, it does not burn the compressor out. Replace you fan capacitor, give the compressor an hour to cool, then try it. In most cases and if I'm correct, the unit will run just like you want it to. Good luck.
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These unit can be recharged. 134A. You NEED A SERVICE TECH THAT KNOWS HOW TO CHARGE UNIT.RUS

Under the drain pan on each side should be a small plastic drain plug they might be clogged up with debris.

If it needs a charge the leak has to be found and fixed. If the leak has been fixed and you have a service valve on the low side. It should have a vacuum pulled on the system to remove all air and non-condensable gases from the system. Then you can charge the system : 1. by weight according to the name plate. 2. charge by superheat (temperature leaving the evaporator + 16°F) When using the superheat method to charge the higher the Ambient temperature the lower the superheat difference will be.