Thetford Cassette C4 Toilet

Introduction

The Thetford Cassette Porta Potti is a functional and aesthetically designed portable toilet for caravan bathrooms. It is constructed from high-quality plastics for durability and features a high-gloss finish for easy cleaning and maintenance. The unit consists of a permanently installed toilet system and a slide-out waste holding tank, known as the CASSETTE.

The toilet section includes a seal and cover, valve blade opener knob, flush knob, waste level indicator, built-in fluid storage compartment, a drain tube, and a fresh water tank. The Cassette section, located underneath the toilet, is removable for emptying via an external access door. It features a rotating pour-out spout, automatic holding tank vent, air release valve blade, sliding cover, carrying handles, and hand grips.

The Thetford Cassette Porta Potti offers a unique solution to caravan sanitary needs.

Features

• 1. Valve blade opener knob: Opens and closes the valve blade.
• 2. Removable seat and cover: For easy cleaning.
• 3. Flush knob: Adds water to the bowl.
• 4. Waste level indicator: Signals when the Cassette is full.
• 5. Water fill funnel: Swings out for easy filling of the fresh water tank.
• 6. Drain tube assembly: For draining the fresh water tank.
• 7. Toilet fluid storage compartments: For storing sanitary fluids (on high models).
• 8. Cassette retainer clip: Secures the holding tank in a locked position.
• 9. Automatic holding tank vent: For pressure equalization.
• 10. Valve blade opener: Mechanism for opening the valve blade.
• 11. Cassette valve blade: The main valve for the waste tank.
• 12. Sliding cover: Guarantees optimal hygiene by automatically opening and closing as the holding tank is moved.
• 13. Upper carrying handles: Facilitate carrying and emptying.
• 14. Air release valve: Ensures smooth, splash-free emptying.
• 15. Lower carrying handles: Additional handles for carrying.
• 16. Hand grip: For easier handling.
• 17. Rotating pour out spout: Allows for easy and convenient emptying.
• 18. Cassette access door: Locks from the outside of the caravan.

Preparing for Use

1. Open the access door on the side of the Caravan and swing out the fresh water fill funnel.
2. Add the recommended amount of Aqua Rinse through the waterfill funnel for better flushing and hygiene. Fill the fresh water tank with fresh water using a hose or jerrycan until the water reaches the neck of the funnel. The tank capacity is 15 liters.
3. Replace the cap. Swing the water fill funnel inward until it touches the side of the water tank.
4. Note: 150 ml of water will remain in the fill bottle when the fresh water tank is empty.
5. Remove the Cassette by pressing the retaining clip down and pulling the tank straight out. Tilt downward slightly if necessary.
6. Position the tank vertically and swivel the pour out spout upward.
7. Remove the spout cap. Remove toilet fluid from the storage compartment. Add the recommended amount of toilet fluid through the pour out spout. Add water until the bottom of the Cassette is completely covered. Replace the cap and turn the pour out spout to its original position.
8. Note: The cap for the pour out spout is packed with the instructions. Hotter weather or longer retention times may require more toilet fluid.
9. Caution: Never add toilet fluid through the valve blade or toilet bowl. Pressure buildup can cause contents to splash upward upon opening the valve blade if done too quickly.
10. Slide the Cassette, with the pour out spout facing outwards, into the caravan through the access door. Ensure the sliding cover is correctly positioned with the arrows pointing towards each other.
11. Make sure the Cassette is locked with the retainer clip.

Operation

Flushing:

1. To prevent overpressure, open and close the valve blade once before use.
2. Add water to the bowl by turning the flush knob clockwise. The knob will automatically return when released.
3. After use, turn the valve knob counter-clockwise to open the valve blade, then turn the flush knob. This provides the best bowl rinse and most efficient water use.
4. After flushing, turn the valve knob clockwise to close the valve blade. The toilet can also be used with the valve blade open, allowing waste to go directly into the holding tank.

Emptying the Cassette:

The Cassette has a capacity of 20 liters and should be emptied when the waste level indicator shows full red. The indicator only starts moving from green to red when the tank is over 3/4 full.

Caution: Do not allow the Cassette to become overfilled. Refer to the troubleshooting section for emergency emptying procedures. Ensure the valve blade is closed before emptying.

12. Open the access door on the outside of the caravan and remove the Cassette tank by pressing the retaining clip.
13. Carry the Cassette using the lower carrying handle, with the pour out spout upwards, to a suitable disposal point. Position the Cassette vertically and rotate the pour out spout upward.
14. Remove the spout cap. Grasp the upper carrying handle nearest to the pour out spout. Place your other hand on the upper rear grip, depressing the air release valve button with your thumb while emptying to ensure smooth outflow.
15. When empty, manually slide the cover towards the pour out spout. Rinse the tank and valve blade area with water.
16. Note: Depress the air release valve button only when the pour out spout is pointed downwards.
17. If necessary, prepare the toilet for use again (refer to steps 1-7). Slide the Cassette into the toilet and lock the access door.

Cleaning and Maintenance

The large seal and the seal for the ventilation should be cleaned and greased regularly (once or twice a month, depending on usage) with silicone spray or salad oil.

Clean the Cassette by rinsing it thoroughly with clean water. Clean the toilet bowl, seat, and cover with a moist cloth. Mild soap or washing-up liquid can be used if necessary.

If the toilet will not be used for an extended period, leave the cap off the pour out spout to allow the Cassette to dry.

Winterizing/Storage

The Thetford Cassette Porta Potti can be easily winterized for storage or cold weather use.

1. Empty the fresh water tank using the drain tube. Position the drain tube outward through the door opening, pull off the plug, and drain the water.
2. Flush a few times by turning the flush knob to drain the pump assembly.
3. Notice: The Cassette must be empty. Empty the Cassette afterwards.
4. Empty the water fill funnel by pulling the bottle away from the tank. Remove the small water cap at the bottom of the fill funnel to allow water to drain.
5. Note: Do not tighten caps; this helps keep the unit dry.

Cold Weather Use:

The Cassette can be used during cold weather if the caravan or motorhome is heated. If the vehicle is not heated for more than a day or night, winterize the Cassette.

Thetford Warranty

1. The Thetford Cassette Porta Potti is warranted to the original buyer for one year from the date of purchase, provided the warranty card is completed and returned within 30 days of purchase.
2. The warranty covers replacement of parts due to defects and workmanship, ensuring the unit performs its intended function.
3. For defects, contact the original dealer or a Thetford Service Centre with proof of purchase.
4. The warranty does not cover defects resulting from misuse, negligence, accident, improper installation or handling, use of non-prescribed chemical agents, alterations, unauthorized repairs, or removal/alteration of the serial number or date.
5. Defective parts should be sent prepaid. If found defective and covered by warranty, they will be repaired and returned at no charge. If warranty does not apply or has expired, a nominal charge will apply. All transport costs are the owner's responsibility.
6. Parts must be cleaned before returning for inspection and repair.
7. No other warranty is expressed or implied, and no representative is authorized to assume liability beyond this warranty.

Troubleshooting

Problems - Solutions

1. Bowl does not drain when toilet is flushed. Cassette is overfilled.
2. Odours. Use the proper amount of holding tank deodorant as specified on the bottle.
3. Soiled bowl after flushing. Partially fill the bowl to cover the soiled portion. The next flush will dissolve the waste. Tip: Leave the valve blade open during use.
4. Cassette cannot be removed. Check for obstacles under the retaining clip. Depress the retaining clip several times to check operation. Ensure the valve knob and valve blade are in a partially open position. Close the valve blade by moving the knob clockwise. Caution: If the valve blade is open during Cassette removal, severe damage to the system can occur. Never force insertion or removal of the Cassette tank.
5. Valve blade mechanism sticks or is hard to open. Spray a light film of silicone on the blade.
6. Major unit malfunction. Contact your original caravan dealer.

Exploded View (C4)

Diagram showing the various parts of the Thetford Cassette C4 toilet with corresponding part numbers and descriptions.

Key Parts:

• 1. Flush knob
• 2. Seat & cover
• 3. Hinge post/pin
• 4. Waterfill funnel complete
• 5. Drain cap/waterfill funnel
• 6. Level indicator
• 7. Flush tube
• 8. Inlet tube
• 9. Bellow
• 10. Flush mechanism complete
• 11. Clip & clip retainer
• 12. Spring (retainer clip)
• 13. Holding tank
• 14. Pour out spout
• 15. Dump cap
• 16. Cap seal & spout seal
• 17. Lip seal
• 18. Seal cover & screws
• 19. Sliding cover
• 20. Vent plug
• 21. Automatic vent
• 22. Seal automatic vent
• 23. Blade opener
• 24. Door complete (22/28mm wall)
• 25. Hinge pin door
• 26. Door seals (2)
• 27. Door complete
• 28. Door seals (2)
• 29. Door lock complete
• 30. Door keys (2)
• 31. Lock cover
• 32. Lock complete
• 33. Door keys (2)
• 34. Lock complete
• 35. Lock cover
• 36. Door keys (2)
• 37. Mechanism complete
• 38. Drain tube
• 39. Door tube

Specify Colour:

• 10 = Ivory
• 44 = Beige
• 56 = Brown
• 62 = White
• 57 = White
• 70 = Jasmin
• 58 = Grey
• 74 = Grey

Capacities

Capacity fresh water tank: 15 L

Capacity waste holding tank: 20 L

Contact Information

Details for Thetford B.V. (Netherlands), Thetford G.m.b.H. (Germany), Thetford SARL (France), Thetford Ltd. (England), and Thetford Corp. (USA) are provided with addresses, telephone numbers, and fax numbers.