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Water
Water Fact:
Worldwide, water use doubled between 1960 and 2000 and continues to increase, but all easily obtainable resources are already being exploited.
 
 
 
 
 
 
 
 
 
 
2 Storey Venting
 
 
Venting Example In A Two Storey Installation
 
 
 
 
 
 
 
 
 
 
Single Storey Venting
 
 
Venting Example In A Single Storey Installation
 
 
 
 
 
 
 
 
 
 
 

Installation of Central Composting Toilet Systems

Vent Stacks

One of the main tasks is the installation of the vent stack, which is included with all units.The vent kits included in the shipping carton are sufficient for installation in most single storey buildings. If more pipe is needed it is normally easy to find. All vent pipes are thinwall PVC. The drawing below illustrates some of the more common vent stack configurations for central system installations:

 
 
 
 
Venting For Central Composting Systems
 
 
Vent Stack Configurations For Central Systems
 
  • Electric Units With 2" Stacks should have the minimum number of bends, should use 45° elbows where possible, and should not have bends totaling more than 360°.
  • 4" Non-electric Vent Stacks should be installed as straight as possible. If 45° elbows are needed in a 4" vent stack then a 12 volt fan should be included in the installation to assist airflow.

Merging a Sun-Mar vent with other existing vents risks interference and is not advised.

The diffuser included with all central units is a simple but effective device originally patented by Sun-Mar principals to aid updraft, resist winter freeze-up, and protect the vent from downdraft and weather. As shown in the drawings the diffuser should be installed 2-3 feet above the peak of the roof for best performance. This prevents downdraft.

Vent joints within the bathroom should be siliconed, vent joints outside should be glued with CPVC glue.

See the Winter Use section for additional tips on protecting your vent stack in the winter.

Detailed Vent Stack Installation Instructions

Electric Unit 2" Vent Pipe Installation

Piping can be installed up the inside wall; through the wall at a slight angle and up the outside wall. The choice depends on ease of installation, visibility, and (especially if the toilet is to be used consistently through a cold winter), the necessity of insulating all exposed vent pipe.

Piping and fittings are of standard 2" PVC central vacuum tubing. Additional pipe or fittings are easily available should you need them, from any building supply dealer. If you cannot find them near your location, they are available in 30" lengths directly through us.

  1. Minimize the number of sharp angles as each reduces vent efficiency. If it is necessary to have angles in the vent pipe, it is recommended that 45 degree angles be used whenever possible. (90 degree elbows may be used as long as no horizontal pipe run results - pipe may be bracketed at a slight upwards angle to prevent this).

  2. Do not lead the vent pipe downward or horizontally at any point. This may lead to the vent pipe being blocked by condensate which would cause a urine smell in your bathroom.

  3. All connectors in the vent pipe should be sealed. Use silicone for the connection of the vent stack to the toilet in case the toilet has to be moved or you have to access the fan. PVC cement may be used in the rest of the stack installation if desired.

  4. All exposed vent pipe should be insulated with the foam insulation supplied with the toilet. This is especially important for winter or residential use.
Non-Electric Unit 4" Vent Pipe Installation

Piping can be installed up the inside wall; through the wall at a slight angle and up the outside wall. Note: With this configuration a 12 volt fan is necessary.

The choice of venting configuration depends on ease of installation, visibility, and (especially if the toilet is to be used consistently through a cold winter), the necessity of insulating all exposed vent pipe.

Piping and fittings are of standard 4" PVC sewer tubing. Additional pipe or fittings are easily available should you need them, from any building supply dealer. If you cannot find them near your location, they are available in 30" lengths directly through us.

  1. The vent stack should be installed as near to vertical as possible.

  2. Silicone caulking should be used for the connection of the vent stack to the toilet because at some time the toilet may have to be moved or you may wish to install a 12 volt fan in the vent stack.

  3. The Sun-Mar 12 volt fan is fitted inside an 11" length of 4" vent pipe for easy installation, should it be needed. It is installed by either cutting out a section of the vent immediately above the composting unit, or by raising the vent stack off of the composting unit and inserting the fan section. The fan can be used with a solar panel and 12 volt battery, or by purchasing a 12 volt adapter from your local hardware store and simply plugging it into the wall.

  4. If a 12 volt fan is installed it should be operated continuously, since otherwise it forms a partial blockage in the vent stack. To install, you can either use PVC connectors or a rubberized connector.

  5. All connectors in the vent pipe should be sealed.

Leading the Vent Through The Roof (All Units)

As shown in the diagram above, the vent stack should end about 20" above the peak of the roof so that it is less subject to downdraft.

Where the piping is taken through the roof, the roof flashing provided may be used to seal the installation or if a new roof is being installed, the roof flashing should be laid underneath the new roofing material.

DO NOT install horizontal sections of vent pipe to avoid leading the vent through the roof.

The Diffuser (All Units)

The diffuser provided with the unit is a simple device to be installed at the top of the vent stack with the larger pipe protruding above the smaller. The diffuser design encourages updraft, and discourages wind and weather from going down the vent stack.

Compared to wind turbines, diffusers are less likely to freeze up in winter, and are more effective in calm weather.

Waste Pipe Installation

The second main task of installing a central unit is the waste pipe installation. Click here for full information on how to install the waste pipe.

Electrical

All electric units are supplied with a power cord and pre-molded plug which connects to a standard (3) pin 110 volt outlet and powers both the fan and heating element.

It is recommended that all units be installed on a GFI (Ground Fault Interrupt) circuit to protect your unit from power surges.
12 volt fans for non-electric models can be installed in-line with the stack, and connected to a battery which draws from an alternate source of energy, such as a solar panel. Click here for more information on the 12 Volt Fan and its installation.

Drains

Central units are all fitted with 1" drains, which should be connected to an approved drain pit, container, or other facility. Click here for more information on handling excess liquid.

Winter Use

Sun-Mar composting toilet systems serve as a reliable year-round facilities when prepared for continuous or periodic use during the cold winter months. If you use your cabin only once in a while in the winter, the unit may be used as a holding tank during this time.

If your Sun-Mar will be in use every weekend in the winter, or in a residence, the temperature must be kept above 55°F at all times to keep the compost going. Click here for more information on winter use.

What's In The Box?

Click here to see what parts are included with your Sun-Mar.


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