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  1. RV AC Soft Start
  2. Dometic
  3. 20 Amp
  4. Plug-In
  5. Single AC
  6. No Surge Protection
Dometic Soft Start for Penguin II Mechanical Air Conditioner Setup - Single Zone - Qty 1
Dometic

Dometic Soft Start for Penguin II Mechanical Air Conditioner Setup - Single Zone - Qty 1

Part Number: DMC52RR
In Stock
$349.20
RV AC Soft Start
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Reduce your RV air conditioner startup power demand by up to 75 percent and eliminate that loud, clunking compressor noise. Start and run your AC without the fear of tripping a breaker or overloading your generator. Great Prices for the best rv ac soft start from Dometic. Dometic Soft Start for Penguin II Mechanical Air Conditioner Setup - Single Zone - Qty 1 part number DMC52RR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (6)
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Dometic RV AC Soft Start - DMC52RR

  • 20 Amp
  • Plug-In
  • Dometic
  • Single AC
  • No Surge Protection

Reduce your RV air conditioner startup power demand by up to 75 percent and eliminate that loud, clunking compressor noise. Start and run your AC without the fear of tripping a breaker or overloading your generator.


Highlights

  • Reduces Startup Power: Lowers AC startup demand by up to 75% for smoother, quieter operation.
  • No More Loud Compressor Noise: Eliminates the clunk and trailer shake when your air conditioner kicks on.
  • Prevents Breaker Trips: Helps you start and run your AC without overloading your generator or tripping a breaker.
  • Generator and Appliance Friendly: Lets you run your Penguin II AC on small generators or with other small appliances.
  • Easy, Pre-Wired Install: No wire cutting or crimping - hardware included for quick setup inside your rooftop unit.
  • Built-In Diagnostics: Three LEDs show operation status and alert you to any faults for easy troubleshooting.

Features to know about

Why Use a Soft Start for Your RV?

A soft start device reduces the initial inrush current when an AC compressor kicks on. Instead of that harsh power spike that can trip breakers or overload generators, the soft start gradually ramps up the compressor's motor, making it easier to start an AC unit on limited power sources (like small generators, shore power, or inverters).

Stay Cool Without the Surprises

If you've ever worried your air conditioner would trip the breaker just as you're drifting off to sleep, or dreaded that loud, clunking start in the middle of the night, this soft start will help you relax. Once you install this device into your Penguin II, your AC compressor starts up quietly and smoothly. Your RV stays comfortable and your sleep stays undisturbed.


More Campsites, More Freedom

You want to stay off-grid, visit state parks, or camp in the mountains, but small generators or limited hookups make running your AC tough. This soft start reduces startup demand by up to 75%, letting you power your Penguin II air conditioner on a smaller generator, at altitude, or alongside your coffee maker. And it's d esigned to resist vibration, flames, dust, and rain, this unit is made for life on the move. An integrated bypass contactor and start capacitor keep your AC safe, even in tough conditions. So wherever you camp, you can enjoy more places and longer trips without worrying about power limits.

Longer Life for Your AC

It's frustrating to worry about repairs or replacement costs on the road. By smoothing out every start, this soft start limits the strain on your AC's motor and compressor, helping prevent wear and extend the life of your system, so you get more reliable cooling season after season.

Install Quickly, Troubleshoot Easily

Nobody wants a complicated install, especially when you're ready to hit the road. This controller is pre-wired and mounts right inside your rooftop unit with included hardware. Three built-in LEDs show you status and help diagnose any issues fast, so you spend less time troubleshooting and more time enjoying your adventure.

Specs

Electrical Specifications:

  • Voltage: 120 VAC
  • Maximum continuous working current: 20 amps
  • Startup power reduction: Up to 75%

Environmental Specifications:

  • Maximum working temperature: 140°F (60°C)
  • Enclosure rating: vibration, flames, and IP65 (dust-tight, water-resistant)

Dimensions:

  • Length: 8-1/4"
  • Width: 3-1/4"
  • Depth: 3-7/8"

General:

  • Application: Dometic Penguin II mechanical air conditioner units with manual control knobs

Warranty:

  • 1-Year limited


9610007171 Dometic SmartStart for Penguin 2 Mechanical Air Conditioner Models

Installation Details DMC52RR Installation instructions


California residents: click here


Video of Dometic Soft Start for Penguin II Mechanical Air Conditioner Setup - Single Zone - Qty 1

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Review of Dometic Soft Start Penguin II Mechanical Air Conditioner Setup - DMC52RR

Hi, everybody. Andy here with etrailer.com. Let's take a real quick look at this Dometic soft start for your Penguin II mechanical air conditioner setup. Now, this is, as I mentioned, designed to fit your Dometic Penguin II mechanical air conditioner unit. And this soft starter does reduce the power needed to start your Penguin II mechanical air conditioner for a more efficient operation. Now, this is designed and tested for all RVs and motorhomes, and this is going to be perfect for boondocking or supplementing generator power in high altitudes.

Now, this will let you run your air conditioner on a small generator, or simultaneously with small appliances. You will need one soft start controller per air conditioner unit. And this is going to really limit the stress that's put on the motor, the compressor, and the drive train to extend the life of your air conditioner. This built-in start capacitor is going to control the torque to ensure smoother startups and stops. So this is going to eliminate your trailer shaking and the loud clunking startup noise from your compressor.

You won't be jolted awake in the middle of the night when your air conditioner kicks on when you have this installed. This is also gonna help prevent overheating using an integrated bypass contactor. It's gonna resist vibrations, flames, it is IP65 rated against dust and low pressure water jet spray. And if you notice here, we do have LEDs that are going to show operations, status, and alert you to potential faults. So this is gonna be a pre-wired installation with the included hardware and the wiring harnesses that you see here.

And what's nice about this is you're not gonna have to worry about cutting or crimping wires to get this installed. Should be a pretty simple installation. And to help you with that, instructions are included to guide you through that installation process. In case you we inchesre wondering about some measurements, let me see if I can give those to you in a way that you can see, measuring what I'm calling the length here, measuring end of post to end of post. We're sitting pretty close to 8 1/4 inches or so, if you can see that.

Looking at the width, let's call it the width, pretty close to 3 1/4 inches wide. The height, about 3 7/8 inches taller. So just to kind of give you an idea of what to expect regarding the size here. This has a maximum working temperature of 140 degrees Fahrenheit. I think that's gonna wrap up our quick look today. I do hope that our brief time together was helpful for you. Again, my name is Andy. Thanks for joining me.

Customer Satisfaction Score:

Ratings & Reviews

4.7

6 reviews
Reduce your RV air conditioner startup power demand by up to 75 percent and eliminate that loud, clunking compressor noise. Start and run your AC without the fear of tripping a breaker or overloading your generator.

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Easy installation and super fast shipping. Thanks again.



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See what our Experts say about this Dometic RV AC Soft Start

  • Which Dometic SmartStart Fits Dometic Penguin II AC With Manual Controls Under Vent Assembly
    Hey Douglas, the correct Dometic Smart Start for your Dometic Penguin II is the # DMC52RR which is for the Penguin II with the control mounted under vent assembly like you have.
    view full answer...
  • How Loud is Dometic Penguin II Low Profile RV Air Conditioner
    Hi Ken; I don't have a reading from that exact distance but I can tell you the noise level of the Dometic Penguin II Low Profile RV Air Conditioner # DMC86ZR is around 62dB. If noise is your main concern, the Dometic FreshJet 3 RV Air Conditioner # DMC39ZR is advertised as their quiet model sitting at 58 dB. Both of these can be used with a soft start. However, as far as I know the current designs don't allow for compatibility with soft starts outside of the Dometic SmartStart. For the...
    view full answer...
  • How Many Amps Will a Dometic Penguin II Draw After Installing the Dometic Soft Start?
    Hey Arik. The Dometic Soft Start for Penguin II Mechanical Air Conditioner Setup - Single Zone item # DMC52RR will limit the amp draw on your Dometic Penguin II to 20 Amps. This is especially important during startup when the power can surge up to 2 or 3 times it's normal usage. What model number is your Dometic Penguin II?
    view full answer...
  • Recommended Soft Start for a Dometic AC System
    Hey Jim, welcome back! There's no information on Forest River's website other than you have a 11,000 BTU AC in your 2025 Palomino HS-2902. What you'll need to do is look for a part number or some kind of identifying information on the AC unit itself or in your owner's manual. We have three options for soft starts that work with Dometic AC units. These are all custom fit options that plug directly into your AC system. The Dometic Soft Start for Penguin II Electronic Air Conditioner Setup...
    view full answer...
  • Which Dometic soft start do I need for Penguin II AC? DMC52RR vs DMC77RR
    Hi Pete, based on the model number 970003821, you most likely have Dometic Penguin II style rooftop air conditioners. The correct soft start depends on how each of your air conditioners is controlled. If one of the units uses a wall thermostat and duct system, that is considered an electronic setup and you would want the Dometic Soft Start part # DMC77RR. If the unit has controls right on the ceiling assembly with knobs or buttons, that is a mechanical setup and you would use part part...
    view full answer...

Do you have a question about this RV AC Soft Start?


Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
Updated by:
Michael B
Employee Sabrina W
Updated by:
Sabrina W
Employee Kim H
Updated by:
Kim H
Employee Amanda M
Edited by:
Amanda M
Employee Andy C
Installed by:
Andy C
Employee Ashley K
Written by:
Ashley K

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