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mike drum 07-27-2012 07:56 PM

condensing unit
got a puron 4 ton condenser that wont come on,checked the charge and the suction pressure was 50psi. so i started charging the unit to get it up for the pressure switch it tried 3 0r 4 times but shut down. i manually made the contactor and got my pressure up to 150 suction 600 head which seems high,pulled off from the contactor hoping it would stay made but shut off

Doc Holliday 07-27-2012 10:42 PM

It also a high pressure switch. The 410-A condensers are very touchy feely when it comes to charge. You can either remove the pressure switches from circuit altogether and then try and set your charge (recovering and then weighing in would be best and if you do that don't forget to always charge Puron systems in liquid, bottle upside down) or simply keep pushing in and holding in the contactor. Make sure the inside system is running as well as sending control voltage out to the condenser but mainly the blower needs to be running or your pressures will never be right, you'll have a really hard time.

HVACDave 07-27-2012 11:16 PM

Could you be cutting out on high pressure now? 600 seems really high for a constant head pressure. I would have thought 350-450 would seem more likely. Does it cycle at all?

scottmcd9999 07-28-2012 05:35 AM

You need to stop and determine why the outdoor unit won't come on. AFTER you figure this out, then you need to charge the system based on subcooling. Consult the literature for the system to determine the correct subcooling value (probably somewhere around 11 degs). You cannot accurately charge a 410A system based solely on pressures, at least in my opinion. You can get close, but until you start taking temps, you won't be sure.

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