Checking Freon Charge/Pressures on Heat Pump


Old 12-30-00, 06:49 PM
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A home heat pump appears to be low on Freon. Would like to check operating pressures using a set of std.manifold gauges. I understand that there are three ports on a heat pump rather than two as on an A/C only unit. Could someone tell me which two of the three ports need to be connected to the "High" and "Low" manifold gauge lines and how they can be identified?

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Old 12-30-00, 07:36 PM
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Your suction line(bigger one) is high pressure. I hope you are EPA approved to handle freon. If not, call a tech, big fine if you get caught without it.

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