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Old 07-11-2011, 12:33 AM
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R134a Manifolg Gauge Set Readings?

I've been using an R12 gauge set for years and am very acquainted with them. Yesterday, I purchased a US General set from Harbor Freight that are for R134a. The gauges are kind of confusing to me because the R134a scale starts at -5 and then goes up to positive numbers. In the center of the dial, you have a conventional number scale. When I read the R134a scale, the reading is +10 on the low side and +65 on the high. But according to the center numbers, its more like 45 and 250. I'm gonna take a picture later and post it. so which one is right? I'm thinking the center one of course - but what are all those positive and negative numbers on the R123a scale for? One other thing - the vacuum scale is located on the inner scale and goes down to 30 hg.

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Old 07-11-2011, 01:19 AM
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Old 07-12-2011, 07:34 PM
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Looks to me like those would be head temps on the low and high sides. +10*C on the low side would equate to about 45-50*F, 65*C on the high side would work out to 150-165*F on the high side.
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