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Author: Paul and Mao Unmack

RV Safety & Maintenance

Oil Contamination in LP Gas Systems

Liquid propane gas (LP) packs a large amount of energy into a small package. As a result, it’s an economical choice for RVers, and it is used for heating, cooking and to power the RV refrigerator when AC power isn’t available. My wife, Mao, and I run our business for

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Your RV Refrigerator Part 6

By Paul Unmack, PE-CSE, ME #116483, www.arprv.com My previous series of articles discussed the process of how refrigeration works. In addition, I’ve discussed how to improve the reliability, efficiency and safety of RV refrigerators. The last article discussed venting and methods to improve refrigerator efficiency, by using a fan controller

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Your RV Refrigerator Part 5 – Removing the Heat

By Paul Unmack, PE-CSE, ME #116483, www.arprv.com The first series of RV refrigeration articles discussed how the refrigeration process works and the control of the process. This article will explain why it is important to remove the heat from your refrigerator and as you prepare for an outing. Heat and

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Your RV Refrigerator, Part 4-controllers and recalls

By Paul Unmack, PE-CSE, ME #116483, www.arprv.com In the previous installments of this series, I discussed how the cooling unit works. Then I covered how heat is applied in order to drive the cooling process. Like all systems, something has to control the cooling process to make it work in

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Your RV Refrigerator, Part 3—Electric Operation

By Paul Unmack, PE-CSE, ME #116483, www.arprv.com In the first article of this series on refrigerators, we covered how the cooling unit works and an example was given on how to test the cooling unit using both of the heat sources. The second article covered the refrigerator not operating properly

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Your RV Refrigerator Part 2 – LP Gas Operation

By Paul Unmack, PE-CSE, ME #116483 In my September/October article, I discussed how the cooling unit on your Dometic- or Norcold-type refrigerator works. I gave the example of the Hallstatt salt mines in Austria using water pipe lines to transport salt from the mines to the transportation depot. A distillation

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Your RV Refrigerator

By Paul Unmack, PE-CSE, ME #116483 Your RV gas/electric refrigerator is one of the great RV mysteries. It’s a device that somehow makes cold from either propane or electricity. No longer are we tied to an AC outlet to keep our food and drink fresh, allowing us great flexibility in

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