This article applies to any TAB 320 model equipped with the Nautilus P3. This includes 2023, 2024, and 2025.

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.