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  1. General HVAC Discussion
    I installed a new 410a complete system with new Orfice coil and new lineset. 70 degrees on install date and initial start up. Suction pressure was 110 and high side of 280. It ran for about 15 minutes. I added a little freon and the high side shot up to 425. I immediately thought I had a...
    410a fluctuating head high pressure
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