Guide to Winterizing a TAB 320 (2023-2025)


This article applies to any TAB 320 model equipped with the Nautilus P3. This includes 2023, 2024, and 2025. If you have an older TAB 320 with a Nautilus P2.5, please check out this support article: Click here.



Step 1: Prepare the System for Draining

  1. Set the Nautilus panel to Power Fill using the key on the sticker.
  2. Open the hot and cold low-point drain valves to let any liquid drain out.
  3. Drain the gray tank to remove excess water.
  4. Locate the fresh water tank drain on the passenger side of the wheel well and drain it.
  5. Inside the camper, lift the dinette seat to find the water heater drain, then open it and let it drain completely.

Step 2: Close the Drains

  1. Once everything is drained, close the:
  • Water heater drain
  • Freshwater tank drain
  • Gray tank drain
  • Low-point drain valves (hot and cold lines)

Step 3: Blow Out the Lines

Materials Needed:

  • Air compressor
  • Pressure gauge
  • RV blowout adapter (garden hose to air hose)
  • Short leader hose

Steps: 

  1. Set each Nautilus panel knob to a 45-degree angle.
  2. Connect your garden hose to the air compressor.
  3. Set the air pressure to 40 PSI.
  4. Open one low-point drain valve and allow compressed air to push out excess water.
  5. Close the drain valve and repeat with the other low-point drain valve.
  6. Inside the camper, blow out the water heater drain using the same process.
  7. Once finished, disconnect the garden hose from the air compressor.

Step 4: Add Antifreeze

  1. Set the Nautilus panel to Winterize mode.
  2. Insert the leader hose into the antifreeze jug or bucket.
  3. Turn on the water pump to start the siphoning process (it will stop when the lines are pressurized).
  4. Open each faucet and fixture inside the camper (hot and cold) until the water runs pink.
  5. Open the bathroom faucet and run both hot and cold until pink.
  6. Connect the external shower hose and turn on the hot and cold taps until pink.
  7. Pour antifreeze down the shower drain to protect the trap.
  8. Add antifreeze to the toilet to protect the shutter valve.

Your camper is now winterized! If you have any questions, contact tech@nucamprv.com.


Guide to Dewinterizing a TAB 320 (2023-2025)

This article applies to any TAB 320 model equipped with the Nautilus P3. This includes 2023, 2024, and 2025. If you have an older TAB 320 with a Nautilus P2.5, please check out this support article: Click here.


Introduction

Dewinterizing your nuCamp TAB 320 involves draining antifreeze, sanitizing the plumbing system, and flushing it with fresh water.



 

1. Drain the Antifreeze

  • Open the gray tank to drain out its contents, then close it.
  • Open the hot and cold drain valves to drain any remaining antifreeze.

2. Prepare a Sanitizing Solution

  • Mix your sanitizing solution based on your preference.
  • A stronger solution can be immediately rushed, while a weaker solution will need to sit to sanitize effectively.
  • Recommended: 1/4 cup per 15 gallons. Let rest for 12 hours.
  • The video suggests 1/2 cup of bleach per gallon of water in a bucket. This can be immediately flushed.
  • Connect one end of a hose to the city water inlet and place the opposite end into the sanitizing solution.
  • A shorter hose is more efficient for this step.

3. Siphon the Sanitizing Solution

  • Turn the Nautilus panel knobs to the Sanitize position using the key on the sticker.
  • Turn on the water pump to begin siphoning the sanitizing solution.
  • Once the freshwater tank is full, turn off the water pump.
  • Use the key on the sticker to switch to Dry Camp mode.

4. Flush the Antifreeze from Faucets and Fixtures

  • Inside the camper, turn on the water pump.
  • Run water through all faucets until the pink antifreeze is gone.
  • Connect and run the external shower hose to remove any antifreeze residue.

5. Empty the Fresh Water Tank

  • Open the freshwater drain valve and let the contents drain completely.
  • Close the valve when done.

6. Refill the Freshwater Tank

  • Set the Nautilus panel to Power Fill mode.
  • Connect a garden hose to the city water connection.
  • Use an inline water pressure regulator to prevent over-pressurization.
  • Monitor the water level to avoid overfilling.
  • Once full, switch the Nautilus panel to Dry Camping mode.

7. Flush the System with Fresh Water

  • Run fresh water through all faucets and fixtures to remove any remaining sanitizing solution.
  • Turn off the water pump once finished.


Final Step: Ready for the Camping Season

Your nuCamp TAB 320 is now dewinterized and ready for use! If you have any questions, contact tech@nuCamprv.com. Happy Camping!


Guide to the Nautilus P3 System

This article and video applies to any nuCamp model equipped with the Nautilus P3. If your model has the Nautilus P2.5, click here.


The Nautilus P3 system is used in the 2025 TAB 320, TAB 360, TAB 400, Cirrus 620, Cirrus 820, and Cirrus 920 models to streamline water management by centralizing essential functions. Below is an overview of its components, functions, and modes.




Step 1: Understanding the Nautilus Panel Components

The front panel of the Nautilus system includes the following key components:

  • City Water Hookup – Connects to city water for direct supply.
  • Black Tank Flush Hookup – Used to clean out the black tank by flushing it with fresh water.
  • Coax Connection for Interior TV – Provides a TV connection inside the camper.
  • Water Pump Switch – Turns on the water pump (identical to the interior pump switch).
  • External Shower – Allows access to hot and cold water outside the camper.
  • Mode Selection Knobs – Adjusts the system’s settings for different functions.
  • Instruction Key Sticker – Provides visual guidance on knob positions for each mode.

Step 2: Nautilus Panel Modes

1. Dry Camping Mode

  • Allows you to pump water from the freshwater tank to your fixtures.
  • Ensure the pump is turned on, either at the Nautilus panel or inside the camper.

2. Power Fill Mode

  • Used to fill the freshwater tank using a garden hose.
  • Connect the hose to the City Water Hookup and allow it to fill the tank.

3. City Water Mode

  • Directly supplies water from a city water connection to your fixtures, bypassing the freshwater tank.
  • No need to use the pump in this mode.

4. Sanitize Mode

  • Used when de-winterizing or sanitizing the system.
  • Connect a bucket or container to the City Water Hookup and siphon liquid into the fresh tank.

5. Winterize Mode

  • Used only during winterization to run RV antifreeze through the system.

Step 3: Using the Black Tank Flush

  • Connect the city water hose to the Black Tank Flush Hookup.
  • This allows fresh water to be forced through the black tank, helping flush out residual waste.

Important Notes:

  • Always use an inline water pressure regulator when connecting to city water (included in your welcome pack).
  • Follow the instructional sticker on the Nautilus panel for proper knob positioning.


Do I Need a Pressure Regulator?


As a nuCamp RV owner, it’s important to understand the role of a water pressure regulator in maintaining your RV’s plumbing system. Whether you're staying at a campsite or connecting to city water at home, a pressure regulator helps protect your unit’s water system from damage caused by excessive pressure.


Why You Need a Water Pressure Regulator

When you connect to city water, the water pressure can vary significantly. In many areas, the pressure can be too high for the delicate PEX lines and connections used in your RV. Without a regulator, water pressure could exceed the 40-50 psi range that is ideal for RV plumbing systems, leading to potential issues like:

  • Leaking connections
  • Burst PEX lines
  • Expensive and time-consuming repairs

To prevent this, every nuCamp RV is shipped with a pressure regulator designed to maintain water pressure between 40 and 50 psi. This ensures that your RV's plumbing system remains intact, and you won’t face costly repairs down the line.



How to Use the Water Pressure Regulator

Whenever you're connecting to city water—whether at a campground or at home—make sure to attach the pressure regulator to your water supply. Simply connect the regulator to the city water inlet on your RV, then hook up your hose to the regulator. This will keep the pressure at a safe level and protect your system from over-pressurization.


When to Use the Regulator

Always use the water pressure regulator when connecting to city water, especially when traveling or camping. It’s essential for protecting your plumbing, as the pressure at some campgrounds or in some locations can be significantly higher than recommended. If you ever have any questions or concerns, don’t hesitate to reach out to our team at tech@nucamprv.com.


Conclusion

In summary, using the water pressure regulator included with your nuCamp RV is crucial to ensuring the longevity of your plumbing system. By regulating the water pressure, you protect your PEX lines and connections from the risk of damage caused by excess pressure. Always remember to use the regulator whenever you're hooked up to city water, and your RV’s plumbing will remain in excellent condition for years to come.


Understanding the Cassette Toilet Components



Many nuCamp models have a 5-gallon cassette toilet. This includes the TAB 320, TAB 360, TAB 360 CS, and Cirrus 620. This may vary from model year to model year. Any model listed from 2021 to 2025 will have a cassette toilet.


The Thetford cassette toilet consists of two main parts:

  • A fixed portion (toilet inside the bathroom).
  • A removable waste tank (accessed from the exterior).

Using the Toilet

  • Flush Button – Press to activate the electric pump, which fills the bowl with water.
  • Handle – Open to release the valve blade and flush the toilet.
  • Level Indicator Display – A red light signals that the waste tank is full and needs to be emptied.

Accessing & Removing the Waste Tank

  • The waste tank access door is located on the driver’s side of the TAB 320.
  • Open the Seaflo access door to reach the tank.
  • To remove the tank:
    1. Pull the safety latch to release the tank.
    2. Slide the tank out using the grab handle and pull-out handle for easy transport.

Draining the Waste Tank

  1. Take the tank to an authorized waste dump station. (For demonstration, water is being used instead of actual waste.)
  2. Rotate the drain spout outward for easy and hygienic draining.
  3. Remove the drain spout cap.
  4. While tipping the tank forward, press the vent plunger on the back to improve airflow and prevent splashing.
  5. Completely drain the tank.

Cleaning & Reinstalling the Waste Tank

  • Once emptied, replace the drain spout cap and return the spout to its normal position.
  • Slide the waste tank back into place until you hear an audible click, ensuring it is locked securely for transport.

Cleaning the Valve Blade

  • Remove the cover to access the valve blade and opener.
  • Spray cleaner inside the tank.
  • Rinse using the spout and valve blade opening.

Important Usage Tips

  • Do not drive with the tank more than three-quarters full.
  • For best performance, empty the tank completely before traveling.

Need Help?

If you have any questions, reach out to nuCamp Tech Support at tech@nucamprv.com.

Thank you and safe travels!