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Re: Cool Xmas for BigKev ?? READ THIS NOW PLEASE
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Webmaster
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So researching A/C thermostat options, I started thinking of a two-stage thermostat. So hear me out here and tell me if you think this would work:
Use a preset thermostat (Part #119-9920 on this pagenostalgicac.com/controls-motors/ac-thermostats.html) back in the truck to prevent the unit from freezing up. The use a second thermostat in series with it up under dash to regulate actual cabin temp. So basically if either of those thermostat hits their temp setting threshold it cycles the compressor off. Work? No Work?
Posted on: 2013/12/5 11:46
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Cool Xmas for BigKev ?? READ THIS NOW PLEASE
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Webmaster
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Also found some picture of the unit mounted in a trunk here. I dont see any straps or brackets. I wonder if it mounts to the floor through the bottom panel. This wouldn't exactly work on a Packard as that area of the trunk is not flat as it is in the studebaker.
studebaker-info.org/tech/aircon/Novi/Novi.html more pics: markiiforum.com/showthread.php?t=1106
Posted on: 2013/12/5 12:00
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Cool Xmas for BigKev ?? READ THIS NOW PLEASE
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Webmaster
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Thats pretty slick work Howard. I may pursue that with you.
But, i'm wondering if a preset one in the trunk is all I need to keep the evaporator from freezing up and perhaps control the temp in the cabin with the dual blowers. HIGH - HIGH, LOW- HIGH (or HIGH-LOW), LOW - LOW, LOW - OFF (OR OFF - LOW). Technically the blowers could be on without the A/C on for circulation, and wire up the circuit so the A/C wont come on unless at least on the blowers is, and replace the center switch in the "Novi" style console with a simple On/Off switch to control the A/C operation. So basically one of the blowers has to be on for the A/C to be on, but the blowers can run without the A/C on. A 12v BOSCH style relay and a few diodes would make that an easy circuit to build.
Posted on: 2013/12/5 15:01
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Cool Xmas for BigKev ?? READ THIS NOW PLEASE
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Webmaster
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Also I found another Packard control panel picture from a 57:
Posted on: 2013/12/5 15:14
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Cool Xmas for BigKev ?? READ THIS NOW PLEASE
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Webmaster
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Reviewing the Mark IV A/C Manual, it appears to control the cabin temp via the blower speed. One rheostat for each blower, and a central ON-OFF switch for the system. So similar to my idea, just the Novi unit has two-speed blower motors.
Posted on: 2013/12/5 16:28
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Cool Xmas for BigKev ?? READ THIS NOW PLEASE
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Forum Ambassador
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V8 Packards had fixed evap temp and controlled the temp out by varying blower speed. Those had a single blower & was not the most comfortable for the entire car. It was a trade off -- for the front to be comfortable, back seat passengers would be hot unless it was on high. For the back seat to be comfortable, the front needed parkas. A trunk unit is just the opposite but at least with two blowers you will have a better chance of finding a common point with the fixed temp.
The original prewar Packard trunk was fixed temp. The postwar Packards & Cads, ARA, the Novi and some of the higher end MarkIV units -- actually most mfg's trunk units -- had two blowers but varied the temp by gas bypass or an early form of suction throttling. Mechanical units that were controlled by the pull out knob or a lever under the control panel. Packard & Cads Frigidaire unit by a rheostat controlled heater fooling a thermostat to open or close a solenoid valve.
Posted on: 2013/12/5 17:07
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Howard
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Re: Cool Xmas for BigKev ?? READ THIS NOW PLEASE
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Webmaster
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Another idea for a thermostat that struck me if to use a bimetallic thermostat with a rotatory adjuster (like used on old house thermostats). That could be used below dash for cabin temp in conjunction with a preset thermostat in the condenser to prevent freeze up.
Or a small circuit with a thermistor and potentiometer to regulate the temp. Basically whether it be mechanical (bimetallic) or electronic, just something that can be set to a target temp and cycles a circuit on above that temp, or off before that temp. That is really how a standard house thermostat works. Just pondering here.....
Posted on: 2013/12/5 18:03
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Cool Xmas for BigKev ?? READ THIS NOW PLEASE
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Webmaster
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I really think this could work....a very simple bimetallic, adjustable temp thermostat which is already in the normal operating range:
broan.com/products/product/72f0238b-dbba-49c5-831b-f7087b90a691
Posted on: 2013/12/5 18:20
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Cool Xmas for BigKev ?? READ THIS NOW PLEASE
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Forum Ambassador
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For something only around $10, definitely worth a try.
Posted on: 2013/12/5 18:36
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Howard
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