Sun-Mar CENTREX 3000 series User manual

Serial No.______________
CENTREX 3000
OWNER’S MANUAL
CENTREX 3000 CENTREX 3000 NE
RATED CAPACITY
Residential & Continuous Use
Certified to NSF/ANSI Standard 41 CENTREX 3000: 6 Adults
CENTREX 3000 NE: 5 Adults
Standard 41
Certified for liquid containment, Weekend & Vacation Use
odors, and solid end products in CENTREX 3000: 9 Adults
both residential and cottage use CENTREX 3000 NE: 8 Adults

Models for which the manual applies:
CCEB-02510 Centrex 3000 115V
CCNB-02540 Centrex 3000 NE
CCEB
-
02515 Centrex 3000 230V

TABLE OF CONTENTS
The CENTREX
3
000 Toilet
The Patented Bio-Drum
Compost Finishing Drawer
Evaporation Chamber
The Collection Chamber
How Composting Works
What’s In the Box?
Parts and Functionality
Installation FAQ
Rough-In Diagrams
Installation Specifications
CENTREX 3000
CENTREX 3000 NE
Space Required and Other
Considerations
Vent Pipe Installation
CENTREX 2000
Collection Chamber Installation
CENTREX 2000 NE (Non-Electric)
Inlet Coupling
Diffuser Installation
Drain Installation
Effluent Handling
Installing The Waste Pipe
Initial Start-Up and Use
Basic Instructions and Ongoing Toilet
Maintenance
Removing Compost From The Bio
Drum ™
Seasonal Usage and Spring Start-Up
Winter Use
1
1
1
1
1
2
3
3
4
5
6
6
6
6
7
7
7
8
8
8
9
9
9
10
11
12
13
13
Com
post Troubleshooting
Compost Too Wet
Waste Not Breaking Down
Lumps In Drum
Drum Too Full
Strong Odor
Flies Present
Mechanical Troubleshooting
Urine Odor in Washroom
Occasional Urine Odor Outside
Fan Noisy
Fan Not Working
Liquid Build-Up In Evaporation Chamber
Liquid Overflow
Heating System not Working/
Lack of evaporation
Liquid in Finishing Drawer
Drum Will Not Turn
Drum Door Not Opening/ Closing
Properly
CENTREX 2000 Explosion Diagram
Wiring Diagram/ Electrical
Specifications
Composting Toilet Accessories
14
14
14
14
14
14
14
15
15
15
15
16
16
16
16/17
17
17
17
18
19
Do NOT stand on the toilet.
Electric toilets must be installed so
that electrical components in the base
of the toilet are protected from rain,
flooding and melting snow.
Do NOT power wash electric toilets.
Using metal tools for cleaning
purpose
s w
ill damag
e the
toilet.

SUN-MAR CENTREX 3000 TOILET
The key to the success of the CENTREX 3000 lies in its three-chamber design. Each chamber – the patented Bio-drum™,
the compost finishing drawer, and the evaporation chamber - has their own independent environments for optimum
efficiency. The Centrex 3000 is the only Sun-Mar unit with an additional compartment for finished compost, called the
Collection Chamber.
The CENTREX 3000 electric version has a thermostatically controlled heater and fan assembly to help evaporate liquid.
They must be connected to electricity consistently, unless the toilet will not be used for three continuous days or longer.
The CENTREX 3000 Non-Electric (“NE”) version is for use where there is no electricity readily available. It has no built-in
fan or heater, but does include a 12-volt fan.
The safety drain must be connected in all Centrex 3000 installations. Please see page 9 for full details
on drain installation.
The Patented Bio-Drum ™
Unique to Sun-Mar, the patented Bio-drum™provides the necessary volume to maintain and easily aerate the compost by
simply turning the Bio-drum™. Excess liquid will exit through a screen in the bottom of the drum into the evaporation
chamber. Mixing the Bio-drum™is accomplished by manually rotating the handle in a clock-wise direction. Compost will
drop automatically into the collection chamber with SUN-MAR’s unique Autoflow™technology. Compost can be
removed from the drum by pulling out the white drum lock button (on the right-hand side, under the handle) and rotating
the handle in a counter clock-wise direction, resulting in compost dropping into the finishing drawer (see page 12).
The Compost Finishing Drawer
The compost finishing drawer sits in the opening in the front right of the unit. Since the CENTREX 3000 automatically
discharges finished compost into the collection chamber at the end of the unit, this drawer is used only if you need to
remove all compost from the drum, or make room in the drum for extended usage of the composter. Removal of the
compost finishing drawer and access panel allows access to the evaporation chamber for cleaning and maintenance
purposes.
The Evaporation Chamber
The evaporation chamber is the floor of the unit under the compost finishing
drawer. This is the area where any excess liquid will gather for
evaporation. A safety drain exits from the left side of the composting toilet which
will drain over-flow liquid that is not evaporated to an approved facility.
The Collection Chamber
CENTREX 3000 units incorporate SUN-MAR’s unique Autoflow™technology.
As the drum rotates, compost moves automatically through the drum and into a
separate collection chamber located near the end of the unit.
1

HOW COMPOSTING WORKS
Composting is the natural process of decomposition that can be assisted by providing the ideal
conditions to help your composting toilet work at peak performance. The ideal conditions for
decomposition to occur depend on several factors: oxygen, temperature, moisture content, and
the carbon/nitrogen ratio.
Oxygen
Oxygen is very important in composting. Your compost should be aerated in order to encourage
aerobic bacteria growth. Aerobic bacteria are bacteria that grow and live in the presence of
oxygen and are very efficient in breaking down waste. To aerate the compost and encourage
the growth of these bacteria, the compost drum should be turned three times per week (6
complete turns of the drum).
Temperature
Temperature is another important consideration when composting. Optimal composting
temperatures range between 70-100 °F (21-38 °C). Decomposition will slow significantly or
stop completely if the compost becomes too cold (below 55 °F or 13 °C). If you are in an area
that experiences temperatures below 55 °F (13 °C) additional heat is required if the composting
toilet will be used continually or frequently. If used for intermittent cottage application (3 - 4
weekends throughout the cold season) no additional heat is required. The toilet will function as
a holding tank until the temperature warms up.
Moisture
Moisture is necessary to achieve good compost. Your compost should always be damp, like
your garden after you have watered it. This moisture allows the bacteria to travel around in the
compost so that they can speed decomposition by digesting the waste. If the compost is too dry,
the bacteria cannot survive and decomposition will slow or cease. When adding water to the
compost, you are aiming for damp compost, not saturated. Too much liquid in the compost limits
the amount of oxygen that aerobic bacteria require to survive. If normal urination is not enough
to maintain the correct moisture level in the compost, we encourage you to add additional water
to the drum.
Carbon/Nitrogen Ratio
Almost all organic material will compost with the proper amounts of carbon and nitrogen. In
order to maintain a good balance between carbon and nitrogen, only carbon-rich materials
(SUN-MAR Compost Sure Blue) and nitrogen-rich human waste should be added to the
composting toilet.
2

What’s in the box?
CENTREX 3000 CENTREX 3000 NE
1-Owner’s Manual
1- Warranty Card
1- Rake
6 - 2”x31” Vent pipes (PVC)
1- 4” Diffusor
2- Compost Sure Blue
1- Hardware Kit
1- 1” x 8’ Drain Hose
1-Collection Chamber
1- Owner’s Manual
1- Warranty Card
1- Rake
5 - 4”x31 Vent pipes (ABS)
1-
6” Diffusor
2- Compost Sure Blue
1- Hardware Kit
1- 1” x 8’ Drain Hose
1-12volt 2.4 watt Fan
1-Collection Chamber
** Please note that the Collection Chamber will be shipped as a second box.
Parts and Functionality
Familiarize yourself with your new toilet
1) Turn the drum handle clockwise to rotate the Bio-drum™for mixing and aeration. (The drum
rotates counter-clockwise and the drum door closes). This is how you will rotate the drum during
regular operation.
2) Lift and remove the access door and rotate the drum until the drum opening is visible through the access
door opening for adding “Compost Sure Blue”. This is how you will add “Compost Sure Blue” bulking
mixture to the drum during regular operation.
3) Pull the drum locker button, (located on the side, near the handle), hold it out and turn the handle
counter-clockwise to simulate removal of compost from Bio-drum™to the finishing drawer. This is how
you will remove compost during regular operation. (see page 12)
4) After the toilet has been plugged in for ten minutes, remove the compost finishing drawer at the bottom
front of the toilet. Place a hand inside the drawer opening, on the surface of the evaporating chamber
(the area under the finishing drawer) to check it is warm to the touch, and that the heater is working
properly (CENTREX 3000 electric).
5) Line the bottom of the collection chamber with the plastic bag (provided). Place the collection chamber
base on the right side of the CENTREX 3000 so that the base rests under the opening in the patented
bio-drum. Place the top of the collection chamber on the base. SUN- MAR Autoflow™technology allows
compost to automatically deposit into the collection chamber.
6) The unit must be installed so that the base is protected from weather. The rubber “u” channel at the bottom
of the unit is well-sealed, but if the unit is sitting in water, has snow melting against it, or rain pouring on it,
this may eventually wear through and short out the heating element. This seal is water resistant; it is not
water-proof.
Note: The composting unit should be placed on a level surface, or sloping slightly toward the safety
drains assembly to ensure drainage of effluent. Do not install the unit in a pit where water can
accumulate around the composter.
3

Installation FAQ
1) Must I install the vent?
Yes, in order to ensure odorless operation.
2) Vent pipe leading out of the toilet
When you are installing the vent pipe, completely
avoid ANY downward sloping or horizontal runs,
no matter how small.
3) How many bends can I put in the vent pipe?
Electric Systems : No more than four 45°bends.
There should not be any horizontal runs (no matter
how small) or downward slopes of the pipe. Fasten
your pipe with the supplied brackets to prevent
settling.
Non-Electric : No more than two 45°bends.
4) Can I merge the toilet vent with an existing
plumbing vent
No. We realize that this will make your installation
easier, but if the toilet is not installed with its own vent,
it will hamper the airflow, and will lead to odors. In
addition, other plumbing fixtures connected to the
same vent will start to smell of ammonia. The toilet
needs to be installed with its own vent in order to
function odorlessly.
5) Where does the diffuser go?
On top of the vent stack .
6) I have a metal roof, an obstruction or a steeply
pitched roof. Must I have the vent above the peak
of the roof?
Yes. If the vent ends under the eave, the air from the
vent will downdraft over the property, possibly causing
a urine smell to occur. The vent should be installed 24-
30 inches above the peak of the roof to prevent
downdraft.
7) How will I secure the stack if I need go to 24-30
inches above the peak of the roof?
Guy wires. These should be available at your local
hardware store; you may have already used them
for other applications.
8) Can I use venting other than what is
supplied?
No, always use the recommended venting.
Schedule 40 venting has a smaller inside diameter
that will reduce venting capacity, and may result in
odor. Flexible venting should not be used in any
application of a CENTREX 3000 toilet, as this will
result in odor around the toilet.
9) Do I need to plug in my electric toilet?
Yes. Your composting toilet should be plugged in
continuously unless it will not be used for 3 or more
consecutive days.
10) Will I need an overflow drain on my Centrex
3000 or my Centrex 3000 NE?
While both toilets have a considerable evaporating
capacity, an overflow drain will be required in all
installations.
11) Do I really need an overflow drain with a
non-electric toilet?
Yes. You will have overflow liquid, even with limited
usage.
12) What should the overflow drain be
connected to?
All effluent handling systems should be in
accordance with local regulatory practices.
13) The area where the composter is
installed can get below 55°F (13°C) at
times. Will this affect composting?
Yes. If the toilet is being used continuously, you will
need to install an additional heat source, and build
an insulated box around the composter (if installed
outside), see page 14 for further details.
4

CENTREX 3000 ROUGH IN DIMENSIONS
5

Installation Specifications
CENTREX 3000
Space Required and other Installation Considerations
1) Ensure that the unit is installed on a level surface or sloping slightly towards the safety drain.
2) Ensure the CENTREX 3000 is protected from precipitation.
3) To ensure that the CENTREX 3000 is accessible for ongoing maintenance, install the composter in an area with a
minimum height of 30”. DIGGING BELOW GROUND TO FACILITATE THE INSTALLATION OF THE CENTREX 3000
IS NOT RECOMMENDED.
4) Compost will be removed from the finishing drawer at the front of the toilet. Ensure that there is at least 17”
in front of the CENTREX 3000 so that the drawer may be removed from the composter unit. (See page 12)
5) The safety drain is required in ALL installations. Install the unit in a location where the safety drain can be connected.
This drain exits from the left side of the unit and must slope downward at all points. (See page 9)
6) Install in a location where the vent pipe can be attached. (See page 7)
7) To ensure proper ventilation, install in a location that is not air tight. The toilet must be able to vent to ensure
odorless operation.
8) The fan will run continuously 24 hours per day while in use. A ground fault interrupter (GFI) circuit is recommended for
any toilet installed. If you are in an area where you experience power fluctuations, you may wish to use a surge protector
Some 230V models may have an over current protection device on the heating element circuit, which is intended to
protect the fuse and is located on the electric box.
CENTREX 3000 NE (Non-Electric)
Space Required and other Installation Considerations
1) Ensure that the unit is installed on a level surface or sloping slightly towards the safety drain.
2) Bends in the vent, downward or horizontal runs, installation near hills or overhanging trees may cause downdraft. A 12
volt fan will be necessary.
3) To ensure that the CENTREX 3000 NE is accessible for ongoing maintenance, install the composter in an area with a
minimum height of 30”. DIGGING BELOW GROUND TO FACILITATE THE INSTALLATION OF THE CENTREX 3000
NE IS NOT RECOMMENDED.
4) Compost will be removed from the finishing drawer at the front of the toilet. Ensure that there is at least 17” in front of the
CENTREX 3000 NE so that the drawer may be removed from the composter unit. (See page 12)
5) The safety drain is required in all installations. Install the unit in a location where the safety drain can be connected. This
drain exits from the left side of the unit and must slope downward at all points. (See page 9)
6) Install in a location where the vent pipe can be attached. (See page 8)
7) To ensure proper ventilation, install in a location that is not air tight. The toilet must be able to vent to ensure
odorless operation.
8) Competing appliances (i.e. wood stove) may need an air intake installed from the outdoors. The CENTREX 3000 NE has
a passive vent. Competing appliances can draw a lot of air and may cause your composting toilet vent to release air into
the building rather than venting to the outside. A 12volt 2.4watt (included)
fan will be necessary.
6

Vent Pipe Installation – CENTREX 3000
If running a vent through a wall, it should only be done at a 45°angle to prevent condensation from accumulating
in the pipe, causing a constriction. Venting should only be installed vertically. Limit bends in the vent stack to no
more than four that have a combined total of 180°. Use silicone to seal all vent connections. DO NOT INSTALL
WITH HORIZONTAL, FLAT OR DOWNWARD SECTIONS OF VENT.
All vent pipe that is exposed to the outside or in a non-heated space should be insulated if using the unit during
cold weather.
INSTALL VENT SO THAT IT TERMINATES 24” - 30” ABOVE HIGHEST PEAK OF THE ROOF. If there is more
than 30” of vent, including diffusor, needed above the roof line, use guy wires to secure the vent above the roof.
A 4” diffuser is included with the CENTREX 3000. This is meant to be installed at the top of the vent stack to
encourage updraft. (See page 8 for installation instructions)
The vent must be installed separately from ALL other household vents. Venting cannot be merged with other,
pre-existing venting. Doing so will prevent the toilet from operating odorlessly.
All connections in the vent pipe should be sealed. Use silicone caulking to seal the connection between the vent
and the composting toilet. A sealant such as PVC cement may be used for all other vent connections.
The vent stack should end approximately 24” - 30” above the peak of the roof to
allow for proper ventilation of odor, and to encourage updraft. Where the pipe is
taken through the roof, a roof flashing may be required if running the vent stack
through the roof. If you have a steeply pitched roof, or are in an area where
snow shear is a danger, you may wish to install a heavier pipe around the vent
pipe where it exits from the roof. If you do choose to install in such a manner,
ensure that the area between the pipes is sealed with a waterproof substance to
prevent leaks.
The collection chamber is included with your Centrex 3000, to facilitate the auto-feed
function of your unit. The collection chamber can be lined with the enclosed chamber bin
liner, and placed around the opening, on the handle side of the unit. This will allow
compost to exit directly into the collection chamber, when finished.
Replacement collection chamber bin liners can be purchased directly through Sun-Mar.
7

Vent Pipe Installation – CENTREX 3000 NE
INLET COUPLING: Place the vent inlet coupling into the hole on the top of the
CEMTREX 3000 NE, so that the 1” of smaller diameter pipe is inserted into the hole
on the top of the toilet. This is the first piece of the venting. Once you have finished
assembling the vent, you should run a bead of silicone around where the inlet
coupling meets the top of the toilet to prevent odor from escaping.
The CENTREX 3000 NE does not have a built-in fan and operates with passive
venting. Due to this, bends in the vent stack must be limited to no more than two 45°
bends. All additional vent pipes should only be vertically installed. THERE CAN BE
NO HORIZONTAL, FLAT OR DOWNWARD SECTIONS OF VENT.
INSTALL VENT SO THAT IT TERMINATES 24” - 30” ABOVE THE HIGHEST
PEAK OF THE ROOF. If there is more than 30” of vent, including diffusor, needed
above the roof line to reach 24-30” above the highest peak of the roof, use guy wires
to secure the vent above the roof.
The vent must be installed separately from ALL other household vents. Venting
cannot be merged with pre-existing venting. Doing so will prevent the toilet from
operating odorlessly.
All connections in the vent pipe should be sealed. Use silicone caulking to seal
connections closest to the toilet, and PVC glue to seal any others
The vent stack should end approximately 24” - 30” above the peak of the roof to
allow for proper ventilation of odor, and to encourage updraft. Where the pipe is
taken through the roof, a roof flashing may be required if running the vent stack
through the roof. If you have a steeply pitched roof, or are in an area where snow
shear is a danger, you may wish to install a heavier pipe around the vent pipe where
it exits from the roof. If you do choose to install in such a manner, ensure that the
area between the pipes is sealed with a waterproof substance to prevent leaks.
Diffusor Installation
The diffusor provided with the toilet is a simple device to be
installed at the top of the vent stack with the larger pipe
protruding above the smaller. To install, simply glue the diffusor
vertically on the topmost section of vent pipe. The diffusor
design encourages updraft, and discourages wind and weather
from going down the vent stack. We do not recommend
installing anything else on the top of the vent as it could impede
the venting. Unlike wind turbines, diffusors are less likely to
freeze in winter, and are more effective in calm weather.
8

The Safety Drain Hose
For all CENTREX 3000 units, the safety drain must be connected. The safety drain is to remove excess
liquid that is not evaporated from the evaporation chamber.
*The safety drain is gravity fed, and so, must slope downward at all points. Do not merge sinks, bathtub,
etc. drains to the safety drain.
1) The drain assembly (fig. 1), has a cap on one end, the other end will
be uncapped to facilitate the connection of the drain hose (Included
with unit). The cap can be removed, and placed on either side
of the drain assembly, for convenience of installation.
Fig 1
2) Place the 1” SS hose clamp over the end of the hose that will
be connected to the drain assembly. Carefully push the drain hose
over the barbed end of the drainassembly where the cap has been
removed (Fig 2) so that the drain hose will overlap the drain Fig. 2
assembly by 1”.
3) Move the 1” SS hose clamp on to the section of the hose that is
covering the end of the drain assembly. Use a flat head screwdriver
to tighten the 1” SS hose clamp (Fig 3), until the drain hose is firmly
affixed to the drain assembly
Fig 3
4) The drain assembly is gravity fed, ensure that the drain hose is
lower than the drain assembly at all points (Fig 4). This may
necessitate clamping the drain to the floor in some installations.
Fig 4
Effluent Handling
The following are possible options to take care of the liquid:
- Feed into a lined pit filled with gravel and sand. Such a
recycling bed also ensures a closed loop system.
- Feed into a small cesspit or “French drain”.
- Plumb into an existing septic or holding tank line.
Installation should be in accordance with applicable local regulations.
Installing The Waste Pipe
When installing the waste pipe from the toilet to the unit, the following should be considered:
1) The pipe should be either 45 °or vertical (if composting unit is directly below toilet), or at a 2-3 °angle (1/8 inch-1/4
inch or 3mm-13mm drop per foot maximum) so that the waste travels with the liquid.
2) Pipe should not slope upwards at any point.
3) Connections should be snug so that waste does not collect and cause blockage.
4) It is recommended that the waste pipe be no longer than 15 feet (460cm) without installing a clear out port (a Y fitting
with screw on end cap) near the toilet to provide easy access should it be required.
5) Use a soft sealant, such as silicone for the connection of the waste pipe to the unit so that the unit can be moved for
servicing or other reasons should this ever be required.
6) Insulate pipe if unit is to be used during the winter.
7) For installations of waste pipe over 6 feet, ensure the waste pipe is supported to prevent sagging.
9

Initial Start-Up
Follow these steps when starting up your CENTREX 3000 toilet for the first time, or if you have emptied
the Bio-drum™ and need to re-start the compost.
After installation is complete, do the following:
Step 1:
Spray Compost Quick: Remove the finishing drawer
and spray the whole inner floor of the toilet (evaporation
chamber) under the finishing drawer. This will help to
prevent organic material from hardening on the floor of
the toilet. Spray Compost Quick into the patented Bio-
drum™ and the inside of the finishing drawer.
Step 2:
Pour 1 bag of Compost Sure Blue into a bucket and add
2 quarts of warm water. Add 1/2 of the Microbe Mix
packet (2 Tablespoons) to the bucket. Allow the
Compost Sure Blue to absorb the water (about an
hour).
Step 3:
Scoop the Compost Sure Blue mixture into the patented
Bio-drum™ through the access door on the CENTREX
3000. Rotate the drum to mix.
Ensure that the opening in the drum remains open
under the waste pipe. The CENTREX 3000 toilet is now
ready for use.
Step 4:
For electric toilets only: The fan should run
continuously 24 hours per day when installed in a
primary residence.
120 Volt Use: Plug in to a three-pronged electrical
outlet.
240 Volt Use: The toilet must use a main plug with an
earth connection.
Replacement of electrical components (including the
power cord and main plug) must be performed by a
qualified person to avoid electrical hazard.
Once installation and initial startup has been completed, the toilet may be used immediately. Please note that when first used it will take
approximately 6 weeks at optimum temperatures (70-90 °F, 20-30°C) before you will have sufficient microbial cultures in the drum to achieve
good compost. During this time, the contents of the Bio-drum™ start out as Compost Sure Blue and waste. Over the first 6 weeks, you will
notice that the compost will hold moisture and will become more uniformly dark in color.
During the first 6 weeks, you may notice that some Compost Sure Blue has fallen through the drum screen onto the evaporation chamber to the
left of the finishing drawer. This should be raked out and removed with the rake tool provided with the toilet.
NOTE: Regular toilet paper may be used. Toilet paper is a good source of carbon for your compost.
10

Ongoing Toilet Maintenance
Once your CENTREX 3000 toilet is installed and you have gone through the initial start-up procedure, follow the steps
outlined below to keep your composting toilet working optimally.
Daily
Even if you only use the toilet for urination, at least one cup of Compost Sure
Blue should be added per person per day of use. Add the Compost Sure Blue
through the access door of the CENTREX 3000 toilet. The Compost Sure Blue
should be added to the composting unit, just prior to turning the drum.
When in use, the opening in the Bio-drum™ must be centered under the
waste pipe, ready to receive waste at all times.
Every second day
Every second day before turning the handle, spray 3-4 sprays of Compost Quick
on the surface of the compost and add Compost Sure Blue, at the rate of one
cup per person per day. Compost Quick is an enzyme that will speed up the
composting process.
Turn the handle in a clockwise direction to mix and aerate the compost. When
mixing, ensure that the drum rotates 6 complete revolutions (42 turns of the
handle).
Every two weeks
Add one scoop (tablespoon) of Microbe Mix to the Bio-drum™ to ‘recharge’ the
pile. This will help to ensure your microbe colony stays constant and healthy.
Every three
months
Rake the evaporation chamber: Remove the finishing drawer. Rake any solid
debris from the floor of the toilet under the drawer (evaporation chamber), paying
extra attention to the two back corners of the toilet as this is where debris may
accumulate. Remove and dispose of the solid debris.
Twice per year
Clean the drum screen. Spray the Bio-drum™ screen with Compost Quick and
let sit for 15 minutes (this will help to loosen the debris if the screen is not too
encrusted). Scrub the screen vigorously with a wire brush. If brushing the
screen does not clear it and liquid is still not draining through the screen, you
may have to use a screwdriver or nail to clear each hole in the drum screen. See
page 18, “Liquid in Drawer” for details.
CAUTION
1) Do NOT add or clean the toilet bowl liner with chemicals. Chemicals will kill the bacteria. Instead, clean the bowl
liner with Compost Quick.
2) Do NOT add plastic, glass, metal, cleaning fluids, cigarettes. Add only waste and Compost Sure bulking material.
3) Kitchen or garden waste, are NOT recommended.
4) Do NOT add baby wipes, diapers or feminine paper as they will not compost.
11

Removing Compost from the patented Bio-drum ™
The level of compost in the patented Bio-Drum™ should never be more than half full. As a guide, the compost in the drum should be at
least 4 inches from the bottom of the drum door. Unlike other Sun-Mar units, the Centrex 3000 uses patented Autoflow technology to
remove finished compost to the collection chamber. If you are expecting the 3000 to receive prolonged use that exceeds its rated
capacity, you may need to manually remove compost to the finishing drawer. It will not fall into the drawer on its own; it must be
removed from the drum by following the steps outlined in this section.
Pull the drum
lock
button
The drum lock button is
located below the handle.
Pull the button out
approximately 1/2” and
hold.
Do NOT push the
button in.
The drum lock button is
attached to a bar that sits in a
molded depression in the drum.
When the button is pulled, the
bar is pulled out of the
depression, which allows the
drum to turn counter-clockwise.
Turn the
handle
counter-
clockwise
While holding the drum
lock button out, turn the
handle counter-clockwise
for three revolutions of
the handle. Release the
drum lock button and
continue to turn the
handle counter-clockwise
until the handle hits a
hard stop.
The drum door will stay open
allowing compost to fall into the
finishing drawer. Fresh and
composted material will be
deposited into the drawer.
Level the
compost
in the drawer
Open the drawer and use
rake to level the
compost.
Leveling the compost will
prevent compost from soiling
the patented Bio-drum™.
Allow the
compost
to rest
Compost should now be
allowed to rest in the
drawer for 3 - 4 weeks to
finish the composting
process.
This compost will be isolated
from any new waste and should
be left in the drawer for a
minimum of 3-4 weeks or
longer to finish composting.
Compost may be removed at any time that you need more space in the Bio-drum ™ .
12

Seasonal Use and Springtime Start Up
Empty Compost from Last Season
Before your first use of the unit, extract compost from the drum by releasing the drum locker (located on the handle side of the unit),
then rotate the handle counter-clockwise giving the drum one complete revolution only. Compost from the drum will drop into the
finishing drawer. Empty the drawer and repeat this procedure until most of the compost is removed, leave 4-6 inches of compost.
This will be your “starter base” for the coming season.
Rake
Remove the finishing drawer and use the rake tool to rake any loose material from the floor of the toilet. Pay careful attention to the
back two corners of the toilet (near the safety drain), to ensure that your drains do not get clogged. Do not dig or chip into the buildup,
as this can damage the toilet.
Add Water & Microbe Mix
Add some warm water to the remaining compost, enough to ensure that it is quite moist. Also, add some Sun-Mar Microbe Mix (two
scoops) to give the compost pile a “kick-start” and rotate the drum several times to mix. If your composting toilet is electric, plug it in
and use for another season.
Guidelines for Winter Use
No Winter Use
When preparing for the winter shut down, just add enough water to soak the compost within the Bio-drum™. Contact Sun-Mar
regarding specific amounts as installation and expected usage varies. If the toilet is electric, make sure to unplug it before leaving.
If the toilet will not be used for the duration of winter, it is possible to place something over the diffusor to prevent animals (who are
looking for a home at this time of year) from getting down the vent stack and into the toilet. Please remember to remove this block
before spring start up. Do not add anti-freeze or similar substances to the toilet.
Occasional Winter Use
If the toilet will be used for 3-4 weekends throughout the winter season, it is considered occasional use. All of the same considerations
should be taken with these toilets to winterize them (please see the information described above, and the section below titled, “Heavy
or Residential Winter Use”). When the temperature dips below 55 °F (13 °C), composting activity will decrease dramatically. These
toilets do not need to be kept warm and will act as a holding tank during the winter months until spring, when it will warm and begin
composting again.
During the winter, the compost will freeze into a solid mass. The drum should not be turned as this may damage the composting
toilet. With this in mind, it is a good idea to remove enough compost before it gets too cold to make room in the drum in the event of
occasional winter use.
Heavy or Residential Winter Use
The toilet should be kept in a heated area and the following winterization tips should be followed if the toilet will receive frequent use:
1) Vent Pipe – electric models: all 2” vent pipe should be insulated where exposed to the outside or in an unheated area. If you are in
an area that experiences extreme winter conditions, we recommend that heat tape should be applied to the exposed vent pipe to
prevent ice blockages.
2) Safety Drain – all models: we recommend that the safety drain should be installed and insulated above the frost line. There will be
less evaporation in the winter so this will help with any excess liquid. If possible, heat tape can be applied to the safety drain to prevent
ice blockage.
3) Keep it warm: If the composting toilet is used frequently in the winter then the toilet should be kept in a warm place, with
temperatures above 55 °F (13 °C).
Warning: The water valve must be drained and removed if the ultra-low flush toilet is installed in an area where
freezing temperatures are anticipated to prevent freezing and cracking of valve.
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Compost Troubleshooting
Symptom Cause Remedial Action Prevention
Compost Too
Wet
Compost porosity is poor Ensure that Compost Sure Blue
is being used.
Use Sun-Mar Compost Sure Blue
Drum screen clogged Spray the drum screen with
Compost Quick. Scrub the drum
screen with wire brush.
When toilet is in use, turn the Bio
Drum ™ every other day, for six (6)
revolutions of the drum.
Waste not
Breaking Down
At All (the
drum will fill up
quickly)
AND/OR
Large Lumps in
Compost
Insufficient Microbes Add Sun-Mar Microbe Mix. Be sure to add the Microbe Mix
packet at start up.
Room Temperature
Under 55 °F/13°C
Install heat source to increase
temperature. Temperature
should be above 55 °F/13°C
constantly to ensure
composting does not stop.
Install toilet in warm area. The
warmer the area, the better your
compost will be!
Compost Too Dry/
Insufficient Moisture
Add 1/2 to 1 gallon of warm
water to compost in order to
bring it up to appropriate
moisture level. Remove or
break lumps apart.
A moisture content of 40-60% is
ideal for aerobic microbes.
Drum Too Full
Compost not emptied
into finishing drawer in a
timely fashion
Remove compost until drum is
only half full or less. Rotate
compost thoroughly to aerate,
and add compost accelerant
(Compost Quick and Microbe
Mix).
Do NOT let drum get above 1/2 full.
This will lead to lack of aeration, and
the possibility of an anaerobic
compost.
Strong Odor
Compost anaerobic
See “’Drum screen is clogged’
in “Compost Too Wet” and
“Drum Too Full”
Follow “Ongoing Maintenance” and
use Compost Sure Blue.
Flies Present
Kitchen/Garden Waste
added
Do not add kitchen waste or
garden scraps.
Do not add kitchen waste or garden
scraps.
Compost too dry
OR
Foreign material added
Applying pesticides such as
pyrethrin, or any locally
permitted equivalent safe for
garden use, to your compost is
an immediate remedy. Please
contact Sun-Mar for specifics.
The alternative to using
pesticides is to completely clean
the toilet out, and wash the
inside of the drum with soap
and water.
IMPORTANT:
If using pesticides, avoid spilling
on the outer shell of the
composter.
Keep compost moist. It should have
a slight gloss or shine. If it does not,
add warm water to it until it reaches
this consistency. Fungus gnats tend
to be attracted to the fungus which
forms on compost when it dries out.
Moist compost will not be attractive
to flies.
Do not add topsoil from the ground,
composted matter, or kitchen scraps
to the toilet. These may carry or
attract flies.
Use Compost Sure Blue.
14

MECHANICAL TROUBLESHOOTING
Symptom Cause Remedial Action Prevention
Urine Odor in
Washroom
Horizontal runs or
downward slopes in
vent pipe
Re-install the vent so there are no
horizontal or low points where
condensation can collect.
Install wall brackets on vent pipe
to prevent settling.
DO NOT install horizontal runs;
liquid will collect and block
ventilation, causing odor.
Fan has failed Have your serial number ready and call
SUN-MAR for a replacement.
Instructions are included with the
replacement fan.
Competing Appliances
OR
Downdraft
If you believe that there may be a
downdraft outside of the building, it may
be a good idea to remove your fan
assembly prior to installation and set
the fan gate to ‘0’ to prevent urine odor
in the bathroom. (This is specific to the
electric models.)
Install a 12volt fan in vent pipe.
(CENTREX 3000 NE) Wood stoves or
furnaces installed in a tightly sealed
room with the composting toilet may
draw air in causing a vacuum in the
room. This will draw air down the vent
pipe.
Downdraft is dependent on wind
direction as well as natural
obstructions etc.
Install the vent so it goes above
the highest peak of the roof.
Occasional
Urine Odor
Outside
(CENTREX 3000 NE)
1) Vent stack not
installed above
peak of roof.
2). If vent stack is
installed above
roof line, natural
obstructions, such
as tall trees, being
located in a valley
or close to a hill
may be causing
downdraft.
1) Check that the vent is installed above
the peak of the roof. If not, extend the
vent. Guy wires may be necessary.
2) Add lime to the evaporation chamber
– Contact Sun-Mar for specific
instructions. You will have to rake more
often if you do this.
3) SUN-MAR has a filter box available
which will filter the ammonia out of the
vented air in a downdraft situation. Call
SUN-MAR for details.
Follow instructions on page 7 & 8.
Fan Noisy
Bearings beginning to
wear, OR
Dust/debris gathering
on blades
1) If it is rattling, it may need to be
cleaned or the bearings are worn and
the fan needs to be replaced.
2) A low “hum” is the normal sound the
fan will make. If you are in a very quiet
setting it will be more noticeable. If this
is the case, consider purchasing a fan
speed control so that the fan may be
turned down.
The fan is a constantly moving
part and has a finite service life.
Clean the fan with a small brush
and/or compressed air nozzle
once a year. This will prevent wear
and lengthen the life of your fan.
15

Fan not
Working
Debris in fan, or
Mechanical failure
resulting in loss of
power
Remove the fan assembly from the
toilet and vacuum any dust out of the
fan blades.
Check the power source (ie. breakers,
fuses). If this does not remedy the
problem, have your serial number ready
and call SUN-MAR
The fan is a continuously moving
part which will eventually have to
be changed.
Liquid Build up
in Evaporation
Chamber
Increased usage The amount of liquid varies
substantially between installations. The
overflow drain needs to be installed.
Install the overflow drain.
Climactic conditions Evaporation rates vary substantially
with climatic conditions. Expect faster
evaporation rates during warm dry
weather.
Mineral salts may have
accumulated in the
evaporation chamber,
reducing evaporation
rates
Fill the evaporation chamber with very
hot water and 1/3 bottle of “Compost
Quick” enzyme liquid. Leave overnight,
and rake gently the following day to
remove.
Rake evaporating chamber at
spring start ups for cottage use,
and once every other month for
residential use.
Liquid
Overflow
If Drain Is Blocked
1) Check drain line for kinks, blockages
or upward bends. Remove and flush if
blockages present; un-kink if bent and
ensure that the drain pipe is sloping
downward. If your drain pipe is in order,
proceed to step 2.
2) Rake any solid materials away from
the safety drains. This is the “build up”
area. If drains are still clogged, proceed
to step 3.
3) Use a wire to poke blockage out of
the drain assembly. A brown spot may
be visible through the opaque
assembly.
Drain all liquid through the overflow
drain by tipping the toilet back (making
sure overflow is hooked up first)
1) A clogged drain is not very likely
to happen if evaporating chamber
is raked every 3-4 months.
2) Use premium 1”ID hose for the
drain line. A good hose will be less
likely to kink. Use elbows or fittings
around bends to prevent kinks.
Hose is provided with the Centrex
3000 and 3000 NE units.
3) Use Compost Sure Blue as a
bulking material.
Overflow drain not
hooked up
Connect overflow safety drain.
Toilet tipped forward Check and ensure that the toilet is level.
Heating
System not
working/ Lack
of Evaporation
Test to determine
whether failure has
occurred
Pull finishing drawer out and put your
hand in the evaporation chamber (NOT
in the liquid). This heat can be felt if
there is liquid in the chamber. If there is
no warmth rising from the floor of the
toilet, your heating system is not
working. It is most commonly the
thermostat that has failed.
If you notice a lack of evaporation, but
there is still warmth in the heating
chamber, see “Liquid Build up” for
solutions.
A ground fault interrupter circuit is
recommended to protect your
Centrex 3000 from power surges
that could cause your heating
system to malfunction.
Thermostat Failure Have your serial number ready and call
SUN-MAR for a replacement. (Detailed
instructions are included with the
replacement part)
16

Heating Element
Failure
Fan failure coinciding with a lack of
heat, or the breaker supplying power to
the heating element beginning to trip
indicates a problem with the element.
Have your serial number ready and call
SUN-MAR for further diagnostic
instructions or to order replacement
parts.
1) Install unit with a ground fault
interrupter and/or a surge
protector,
2) If you remove the toilet from the
bathroom for cleaning, DO NOT
use a water hose to clean the
toilet. The base is water resistant,
NOT water proof.
3) Install according to manual
guidelines.
Blown fuse
(230V toilets ONLY)
Have your serial number ready and call
SUN-MAR for a replacement. (Detailed
instructions are included with the
replacement part) Check fuse located
on the electric box to ensure that it is
functioning correctly, if the wire in the
fuse is charred or broken, replace the
fuse.
Power surges can cause the fuse
to blow. If this is a possibility in
your area, a surge protector is re-
commended.
Liquid in
Finishing
Drawer
Drum Screen Clogged
Or
Condensate coming
down vent stack (NE)
CENTREX 3000 (electric): Unplug the
Centrex 3000 before attempting any
maintenance. Disconnect the vent
stack and remove the fan assembly.
Rotate the drum until the drum screen
is visible. Spray the drum screen with
Compost Quick and let sit for 30-45
minutes. Use a long-handled wire brush
to thoroughly scour the drum screen.
Rotate drum so screen is on the
bottom, then look through drawer
opening to check for liquid dripping from
screen.
CENTREX 3000 NE: Remove the blank
fan plate. Rotate the drum until the
drum screen is visible through the
opening where the blank fan plate was
located. Spray the drum screen with
Compost Quick, let sit for 30-45
minutes, then thoroughly scour with
long handled wire brush.
Following the routine maintenance
described on page 12 will prevent
the drum screen from becoming
clogged.
In a CENTREX 3000 being used
residentially, the drum screen
should only have to be scrubbed
twice a year, approximately every
six months.
Drum will not
turn
Set screw securing
handle to shaft has
broken.
Drill out set screw and replace, or have
your serial number ready and call SUN-
MAR for a handle replacement kit
(instructions included).
Drum should never be more than
½ full. Use the circular indent on
the front inside of the drum as a
guide. Compost should never be
above half way up that circle. See
page 12 for further information on
removing compost.
Steel roll-pin securing
gear wheel to shaft
has broken.
Have your serial number ready and call
SUN-MAR for a replacement small gear
kit.
Drum Door Not
Opening/
Closing
Properly
Drum too full and/or
Hinges are stuck
Spray hinges with Compost Quick.
Scrub hinges with toothbrush or other
soft nylon bristled brush.
Remove compost using a small, hand-
held tool until drum is less than half-full.
Do not allow the Bio-drum™ to
become more than half full. This
can lead to excess stress on
hinges and other moving parts,
and can prevent compost from
being able to exit the drum.
If you have any questions, please call Sun-Mar’s customer service number, 1 888 341 0782 ext. 218
before proceeding with any mechanical repairs. The serial number of your composting toilet will be
required for warranty purposes, and to ensure that the correct part is provided for your toilet.
17