Re: Beating a Dead horse - 6v AC

Posted by HH56 On 2010/1/10 20:00:45

POA valves were used on lots of cars and provide a constant temp for the evaporator. Believe they are rather sensitive to size of evaporator and also have some plumbing requirements so the oil can route around and not get trapped so a little more complex and some engineering required. Suction throttling is a little less involved as is basically a pressure differential balancing act between evaporator, atmosphere and springs. HGB the simplest as valve just opens or closes but the trick is to ensure liquid refrigerant is not able to get to suction side and damage compressor. 53-4 Packard was an electric solenoid valve mounted on fender to right of compressor and 55-6 was a modulator valve similar to expansion valve and was mounted at exit of evaporator at firewall. There was an extra run of tubing on both to short circuit the freon. Don't know how the Buick system was plumbed. Cadillac also used the solenoid while Ford products used a modulator. Here is a brief description of how HGB worked.


EDIT: Regarding Kevs post on the inverter/converter. A good idea but make sure to find one rated for inductive loads such as motors. The only one I've seen that is a possibility is by Newport engineering which they list as an accessory for their wiper motors. Again, that is even iffy because it's fused for 5 amps. Most inverters I've found absolutely state not for use with motors ie inductive loads.

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