Sun-Mar CENTREX 1000 User manual

Serial No.______________
CENTREX 1000
OWNER’S MANUAL
CENTREX 1000 CENTREX 1000 NE
RATED CAPACITY
Certified to NSF/ANSI Standard 41 Weekend Vacation Use
Standard 41
Certified for liquid containment, CENTREX 1000: 7 Adults
odors, and solid end products in CENTREX 1000 NE: 6 Adults
both residential and cottage use

Models for which the manual applies:
CCEL-02201 Centrex 1000 115V
CCNL-02301 Centrex 1000 NE
CCEL-02202 Centrex 1000 240V
Unit must be installed so electrical components in the base are protected from
rain, flooding and melting snow.
Place the warning and cleaning sticker on the inside lid of the ultra low flush
toilet.
Metal tools will damage the toilet.

OWNER’S MANUAL
CONTENTS
How Composting Wo ks 2
The CENTREX 1000 Toilet 3
The Patented Bio-Drum 3
Compost Finishing Drawer 3
Evaporation Chamber 3
Inspection 4
Check for Damage 4
What’s in the Box 4
Familiarize yourself with the
CENTREX 1000 4
Placement of the unit 4
Installation 5-7
CENTREX 1000 Rough in
Dimensions 5
CENTREX 1000 Elect ic Installation 6
Space requirements 6
Vent Piping Location 6
Electrical Considerations 6
CENTREX 1000 NE Installation 7
Space requirements 7
Vent Piping Location 7
Installation Common To All 8
Leading the vent through
the Roof 8
Leading the vent through the wall 8
The Diffusor 8
Drain Installation 8
Handling Effluent 8
Installing The Wastepipe 9
Installing The Ult a-Low
Flush Toilet 9
Sta t Up And Use 10
Ongoing Maintenance 11
- 1 -
Sp ing Time Sta t Up 12
Winte Use 12
Removing Compost f om the
Bio-D um 13
Compost T oubleshooting 14
Compost Too Wet 14
Waste is not Breaking Down 14
Lumps In Drum 14
Drum Too Full 14
Flies Present 14
Mechanical
T oubleshooting 15-17
Urine Odor In Washroom 15
Occasional Urine Odor Outside 15
Strong Sewage Odor 15
Fan Noisy 15
Fan Not Working 16
Liquid Buildup/
Lack of Evaporation 16
Liquid Overflow 16-17
Heating System Not Working 17
Liquid In Finishing Drawer 17
Drum Will Not Turn 17
Drum Door Not Opening/
Closing 17
Basic Inst uctions 18
Composting Toilet
Accesso ies 19
CENTREX 1000 Specifications 21

HOW COMPOSTING WORKS
Composting is the natural process of decomposition that can be helped along 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).
Tempe atu e
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 unit will function as a holding tank until the temperature
warms up.
Moistu e
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.
Ca bon/Nit ogen Ratio
Almost all organic material will compost. The proper bulking material and human waste
should be added to the composting toilet. In order to maintain a good balance between
carbon-rich materials (SUN-MAR Compost Sure Blue) and nitrogen-rich human waste
only.
- 2 –

THE SUN-MAR CENTREX 1000 TOILET
The key to the success of the CENTREX 1000 lies in its three chamber design. Each
of the three chambers; patented Bio-drum, compost finishing drawer, and evaporation
chamber, have their own independent environments for optimum efficiency.
The CENTREX 1000 electric version has a thermostatically controlled heater and fan
assembly to help evaporate liquid and should be used where there is a constant
electrical supply. The CENTREX 1000 NE (non-electric) version is for use where there
is no continuous electric supply. The CENTREX 1000 NE has no fan or heater.
Odorless operation is achieved by a 4” vent which acts like a chimney creating a partial
vacuum within the unit.
The Patented Bio-D um
Unique to Sun-Mar, the patented bio-drum provides the necessary mass to maintain
good compost and allows easy aeration of the compost by simply turning the 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 rotating the handle in a clock-wise
direction. Compost is removed from the drum by pulling out the white drum lock button
(below the handle) and rotating the handle in a counter clock-wise direction.
The Compost Finishing D awe
The compost finishing drawer sits in an opening in the front of the unit. Compost in the
drawer is isolated from mixing with new waste while resting for 4 weeks so that it can
finish composting.
The Evapo ation Chambe
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.
- 3 –

Inspection
We recommend an inspection of the CENTREX 1000 prior to installation and to make
sure you have received all of the parts required as listed below.
- 4 –
Inspecting the
unit fo
Damage
What’s in the
Box
Familia ize
You self with
the
CENTREX
1000 Toilet
Placement of
Unit
1. If there is any visible damage to the carton-
The contents of the carton should be inspected before signing the
bill of lading. Damaged units should be refused. Call Sun-Mar
immediately.
2. If the shipper has left-
Report the damage immediately to the transport company and call
Sun-Mar.
3. Soon after delivery, remove the CENTREX 1000 Toilet carefully
from the carton- If there is hidden damage, or for any service
questions, contact Sun-Mar to determine the best course of action.
1- Owners Manual 1 - Warranty Card
1- 6” Diffusor (NE) 5- 4”x31” Vent Pipes (NE)
1- Hardware Kit 1- Rake
1- 1” x 8’4” Drain Hose 1- 4” Diffusor (Electric)
1- Compost Sure Blue 6 - 2”x31” Vent pipe (electric)
1. Turn the drum handle clockwise to rotate the patented 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, rotate the handle 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. Plug the unit’s electrical cord (Electric) into a standard three-prong
electrical outlet, and feel the air movement from the vent outlet at
the front of the unit to ensure the vent system is working properly.
4. Pull out the compost finishing drawer at the front bottom of the
unit. After the unit has been plugged in for ten minutes, place a
hand on the floor 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.
The unit should 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. Install your unit with a protective cover of some kind
to protect it from precipitation reaching it. 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 whe e wate can accumulate a ound the composte .

Installation
CENTREX 1000 ROUGH IN DIMENSIONS
- 5 –

CENTREX 1000 Elect ic Installation
- 6 –
Space
Requi ed and
othe
Installation
Conside ations
Vent Pipe
Location
Elect ical
Conside ations
1. Compost will be removed from the finishing drawer. Ensure that there is at least 15” in front of the
CENTREX 1000, so that the drawer may be removed from the unit.
2. 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.
3. Install in a location where the vent pipe can be attached as per the instructions listed below.
4. Install in a location that is not air tight. The toilet must be able to vent to ensure odor free operation.
5. Ensure that the CENTREX 1000 is accessible for ongoing maintenance.
6. Ensure that the installation area is a minimum height of 28”. DIGGING BELOW GROUND TO
FACILITATE THE INSTALLATION OF THE CENTREX 1000, IS NOT RECOMMENDED.
7. Ensure the CENTREX 1000 is protected from precipitation.
8. Ensure that the unit is installed on a level surface or sloping slightly towards the safety drain.
1. If running a vent through a wall, it should be done at a 45° angle to prevent condensation from
accumulating in the vent pipe, causing a constriction. NO HORIZONTAL SECTIONS OF VENT.
Venting should be installed vertically.
2. 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.
3. INSTALL VENT SO THAT IT TERMINATES 24” - 30” ABOVE HIGHEST PEAK OF THE ROOF.
4. If you will be installing venting on a steeply pitched roof where snow shear may occur; Install a
heavier pipe through the roof and feed the enclosed vent through the heavier pipe. Seal
between the pipes with expandable foam or other such water-tight substance. The heavier pipe
should be able to withstand the weight of sliding snow.
5. If there is more than 36” of vent needed above the roof line to reach 24-30” above the highest
peak of the roof (diffusor included in measurement), use guy wires to secure the vent above
the roof.
6. Limit bends in the vent stack to no more than 4 that have a combined total of 180 °.
7. The vent must be installed separately from ALL other household vents. Venting cannot be
merged with other venting. Doing so will prevent the unit from operating odorlessly.
8. All connectors in the vent pipe should be sealed. Use silicone caulking to seal the connection
between the vent and the fan. PVC cement may be used on all other vent connections.
9. The diffusor should be glued vertically on to the top of the vent pipe. This assembly helps draw air
up the vent pipe.
Possible venting configurations for the 2” electric vent pipe.
The fan will run continuously 24 hours per day. A ground fault interrupter (GFI) circuit is recommended
for any unit installed in an environment where it will be exposed to moisture. This may be installed
directly on the wall socket or at the circuit breaker. If you are in an area where you experience power
fluctuations, you may wish to install a surge protector.
Some 230V models may have an over current fuse protection on the heating element circuit which is
located on the electric box.

CENTREX 1000 NE (Non-Elect ic) Installation
- 7 –
Space
Required and
other
Installation
Considerations
Vent Pipe
Location
Vent Inlet
Coupling
1. Compost will be removed from the finishing drawer. Ensure that there is at least 15”
in front of the CENTREX 1000 NE so that the drawer may be removed from the unit.
2. The safety drain is necessary for 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.
3. Install in a location where the vent pipe can be attached as per the instructions listed
below.
4. Install in a location that is not air tight. The toilet must be able to vent to ensure odor
free operation.
5. Ensure that the CENTREX 1000 NE is accessible for ongoing maintenance.
6. Ensure that the installation area is a minimum of 28” in height. DIGGING BELOW
GROUND TO FACILITATE THE INSTALLATION OF THE CENTREX 1000 IS NOT
RECOMMENDED.
7. Bends in the vent, installation near hills or over hanging trees may cause down draft.
A 12 volt fan may be necessary.
8. Competing appliances (ie. wood stove) may require an air intake installed from the
outdoors if the unit is installed in an enclosed basement. A 12 volt fan may be
required.
9. Ensure that the unit is installed on a level surface or sloping slightly towards the
safety drain.
1. All vent should be vertically installed.
2. Limit bends in the vent stack to no more than 2 - 45 °
bends. NO HORIZONTAL SECTIONS OF VENT.
3. INSTALL VENT SO THAT IT TERMINATES 24” - 30”
ABOVE HIGHEST PEAK OF THE ROOF. If the vent
is being installed on a steeply pitched roof where snow
shear may occur; Install a heavier pipe through the
roof and feed the enclosed vent through the heavier
pipe. Seal between the pipes with expanding foam or
other such water-tight material. The heavier pipe
should be able to withstand the weight of sliding snow.
4. If there is more than 36” of vent needed above the roof
line to reach 24-30” above the highest peak of the roof
(diffusor included in measurement), use guy wires to
secure the vent above the roof.
5. The vent must be installed separately from ALL other
household vents. Venting cannot be merged with
other venting. Doing so will prevent the unit from
operating in an odorless fashion.
6. All connectors in the vent pipe should be sealed. Use
silicone caulking to seal the connections.
7. The diffusor should be glued vertically on to the top of
the vent pipe. This assembly helps draw air up the
vent pipe.
Place the vent inlet coupling into the hole on the top of
the unit for the 4” vent and so that the 1” of smaller
diameter pipe is protruding into the hole. This is the first
piece of the venting. Once you have finished assembling
the vent, run a bead of silicone around where the inlet
coupling meets the top of the composting unit to prevent
odor from escaping.

Installation Common To Elect ic O NE Units
-
- 8 -
Leading the
vent th ough the
oof
Leading the
vent th ough the
wall
The Diffuso
D ain
Installation
Handling
Effluent
The vent stack (shown in diagram) should end
approximately 30” above the peak of the roof so that
it is less subject to downdraft. Where the pipe is
taken through the roof, a roof flashing may be
required to seal the installation. If you 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 do this,
ensure that you seal the area between the pipes
with a waterproof substance to prevent leaks.
When it is necessary to lead the vent through a wall,
connect one 45° elbow on the vent outlet on the unit.
Using a hole saw or other appropriate tool, cut a
hole through the wall board behind the unit so that
the vent pipe can be inserted into the 45° elbow. Cut
a similar hole on the other side of the wall that is
slightly higher than the inner hole so that the vent
pipe will be angled upward at 45°. If installing
through an exterior wall, waterproof sealant will be
required around the vent pipe where it emerges from
the building.
The diffusor 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. 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.
The safety drain must be connected as it will be required in all Centrex 1000 NE
installations or Centrex 1000 electric with ultra-low flush toilets.
- Remove the orange cap from one side of the overflow drain assembly.
- Place a 1” hose clamp over the end of the drain hose that will be connected to the
overflow drain assembly.
- Push the drain hose over the ribbed end of the over-flow drain and clamp with the 1”
SS hose clamp.
- Connect the 1” hose to an approved drainage facility.
- The safety drain is gravity fed. The drain hose must be below the level of the safety
drain in order to function.
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.

– 9 –
Installing the
waste pipe
Installing the
Ult a Low
Flush Toilet
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”-1/4” or 3-13mm 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 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 longer installations of waste pipe, ensure the waste pipe is supported
to prevent sagging.
1. Make sure the center of the floor flange is at
least 11 inches (280mm) from the back wall.
2. When Installing a new floor flange, ensure
that the toilet mounting bolts align properly
with ultra low flush toilet mounting pattern.
3. Secure flange to floor using flat head screws
through counter-sunk holes in flange. Insert
bolts into slotted holes in flange(Fig. A)
4. Position floor seal by pressing the floor bolts
up through the holes in the seal.
5. Set toilet in place with bolts protruding up
through mounting holes in base (Fig C).
6. Install washers and hex nuts provided with
toilet. Tighten nuts down equally with
standard 7/16” (12mm) open end wrench.
7. Connect water supply line to water valve (1/2”
or 13mm MPT) inlet using appropriate fittings
(Fig D)
8. Turn on water supply and flush toilet to test
for leaks.
9. Attach pedestal and pedal covers to toilet
base. See instructions below.

Initial Sta t Up and Use
These steps are only used when starting up your CENTREX 1000 toilet for the first
time or when you have emptied the drum and need to re-start the compost.
After installation is completed do the following:
Step 1 : Spray Compost Quick: Remove the finishing drawer
and spray the whole inner floor of the unit under the
finishing drawer. Spray Compost Quick into the patented
bio-drum and the inside of the finishing drawer.
Step 2: Pour 1/2 bag of Compost Sure Blue into a bucket and add 2 quarts of
warm water. Add 1/2 of the Microbe Mix packet 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 1000. Rotate the drum
to mix. The opening in the drum must remain open under the waste pipe.
The CENTREX 1000 toilet is now ready for use.
Step 4: For electric units only. The fan will run continuously 24 hours
per day.
120 Volt Use: Plug it in to a three prong electrical outlet.
240 Volt Use: The unit must use a mains plug with an earth
connection. Replacement of electrical components (including the
power cord and mains plug)must be performed by a qualified person
to avoid hazard.
When you first start up the CENTREX 1000, it will take approximately 6 weeks at optimum temperatures (70-90 ° F)
before you will have sufficient quantities of microbes in the drum to actually achieve good compost. During this time, the
contents of the patented 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 six 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 unit.
NOTE: Regula toilet pape may be used. Toilet pape is a good sou ce of ca bon fo you compost so it may be
added to the Bio-D um™
- 10 –

Ongoing Toilet Maintenance
Once your CENTREX 1000 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.
CAUTION
1. Do NOT add or clean the toilet bowl liner with chemicals. Chemicals will kill the bacteria. INSTEAD, clean the toilet
bowl with Compost Quick.
2. Do NOT add plastic, glass, metal, cleaning fluids, cigarettes. Add only waste and 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 -
Add one cup of
Compost Su e Blue
pe pe son pe day of
use
Sp ay Compost Quick
on the su face of the
compost
Tu n the handle
clockwise eve y
second day to mix the
compost
Make su e that the
opening in the d um
is cente ed unde the
waste pipe.
Eve y two weeks
Eve y th ee months
Twice pe yea
Pe iodic maintenance
Even if you only use the toilet for urination then 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 CENTREX 1000
toilet. The Compost Sure Blue should be added to the composting
unit, just prior to turning the drum.
Every second day before turning the handle, spray 3-4 sprays of
Compost Quick on the surface of the compost. 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).
The hole in the drum must be open under the waste pipe, ready to
receive waste.
Add one scoop of Microbe Mix to the patented bio-drum to ‘recharge’
the pile. This will help to ensure your microbe colony stays constant
and healthy.
Rake the evaporation chamber: Remove the finishing drawer. Rake
any solid debris from the floor of the unit under the drawer
(evaporation chamber), paying extra attention to the back corners of
the unit as this is where debris may accumulate. Remove the solid
debris.
Clean the drum screen. Spray the 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 the
wire brush. If brushing the screen does not clear it and liquid is still
not draining through the screen, you may have to resort to having to
use a screwdriver or nail to puncture each hole in the drum screen.
Remove compost from the drum. When the drum is half full (even
with the middle of the drum hub at the front of the drum) it is time to
remove compost. To remove compost from the drum:
See page 13 of your Owner’s Manu
al

Seasonal Use and Sp ingtime Sta t Up
Empty Compost f om 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 completely and use the rake tool to rake any loose material from the floor of the unit. Careful
attention should be paid, to the left two corners of the unit (near the safety drain) to ensure that your drains do not get
clogged.
Add Wate & Mic obe 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 of 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.
Winte Use
No Winte Use
Just add water, lots of water. Soak the compost in the drum to prevent it from drying out before Spring. Make sure to
unplug the unit if electric. If you have a non-electric unit, it may be a good idea to place something over the diffusor to
prevent animals (who are looking for a home at this time of year) from getting in.
Occasional Winte Use
If the unit will be used for 3-4 weekends throughout the winter season then it is considered occasional use. All of the same
considerations should be taken with these units to winterize them. When the temperature dips below 55 ° F (13 ° C),
composting activity will decrease dramatically. These units do not need to be kept warm and will act only as a holding tank
during the winter months until they warm up enough in the spring to begin composting again. During the winter, the
compost will freeze into a solid mass so the drum should not be turned as it 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 for winter use.
Heavy o Residential Winte Use
These units should be kept in a heated area and all winterization tips should be followed, including the following:
1. Vent Pipe - electric models; all 2" vent pipe should be insulated if they are 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 composting part of the unit should be
kept in a warm place. Below 55 ° F (13 ° C), composting actions slows dramatically so if it is in a place that falls below
this temperature, a source of heat should be provided for the unit so that it can keep up with constant use.
Wa ning: The wate valve must be d ained (o emoved) if the ult a low flush toilet is installed
in an a ea whe e f eezing tempe atu es a e anticipated to p event f eezing and c acking of
valve.
- 12 –

Removing Compost f om the patented Bio-D um
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. Compost must be
removed from the drum by following the steps outlined in this section.
Compost maybe be removed at any time that you may need more space in the drum and will need to
be removed more frequently for heavily used units or where the CENTREX 1000 toilet is the primary
residential toilet.
- 13 -
Pull the
d um lock
button
Tu n the
handle
counte -
clockwise
Level the
compost
in the
d awe
Allow the
compost
to est
The drum lock button is
located below the handle.
Pull the button out
approximately 1/2” and
hold.
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.
Open the drawer and use
rake to level the
Compost.
Compost should now be
allowed to rest in the
drawer for 3 - 4 weeks to
finish the composting
process.
The drum lock button
is attached to a bar
that sits in a molded
depression in the
drum. When you pull
the button, you pull
the bar out of the
depression which
allows you to turn the
drum in the opposite
direction.
The drum door will
stay open allowing
compost to fall into
the finishing drawer.
Fresh and composted
material will be
deposited into the
drawer.
Leveling the compost
will prevent compost
from soiling the
patented bio-drum.
This compost will be
isolated from any new
waste and should
be left in the drawer
for a minimum of 4
weeks or longer to
finish composting.

Compost T oubleshooting
- 14 –
- 14 –
Symptom Cause Remedial Action P evention
Compost
Too Wet
Waste not
Breaking
Down at all
(the drum
will fill up
quickly)
Large
Lumps
in
Compost
Drum Too
Full
Flies
Present
Compost porosity
is poor.
Drum screen
clogged
Insufficient
moisture in
compost
Insufficient
Microbes
Room
Temperature
Under 55 ° F /13 °C
Compost Too Dry
Compost not
emptied into
finishing drawer
in a timely fashion
Kitchen/Garden
Waste added
-compost too
dry
-compost
anaerobic
-foreign material
added
Change bulking material to Compost Sure
Blue.
Spray the drum screen with Compost
Quick. Scrub the drum screen with wire
brush.
A moisture content of 40-60% is ideal for
aerobic microbes to thrive.
Add Sun-Mar Microbe Mix.
Install heat source to increase temperature.
Temperature should be kept above 55 °
F /13 °C constantly to ensure the composting
action does not stop completely.
Add 1/2 to 1 gallon of warm water to
compost in order to bring it up to
appropriate moisture level.
Remove lumps or break them apart.
Remove compost until bio-drum is only half
full or less. Rotate the compost bio-drum
thoroughly to aerate, and add compost
accelerant, (Compost Quick and Microbe
Mix) if available.
We do not recommend adding kitchen or
garden scraps.
1.To eliminate flies, you can use any
pesticide that is used on your garden.
Pesticides used for garden use are not
anti-bacterial so are safe to use on your
compost.
2. The alternative to using pesticides is to
completely clean the toilet out, wash the
inside with soap and water
IMPORTANT:
Application of a pesticide in a SUN-MAR
toilet is not a health concern because all
SUN-MAR units are vented.
If using pesticides, avoid spilling on the
outer shell of the composter
Use Sun-Mar Compost Sure
Blue
Add water to patented bio-
drum
Be sure to add microbe packet
at start up.
Install unit in warm area. The
warmer the area, the better
your compost will be!
Use proper bulking material
and add warm water if
necessary.
When drum is 1/2 full, remove
some compost to the finishing
drawer. Do NOT let drum get
above 1/2 full. This will lead to
lack of aeration, and anaerobic
compost.
Do Not add kitchen or garden
waste.
1. Keep compost moist. In
order to determine a good
level of moisture, shine a
flashlight into the drum. The
compost 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 dry compost, due
to the fungus which begins to
form on the surface when it
dries out. Good, moist
compost will not be attractive
to flies.
2. Do not add topsoil from the
ground, composted matter, or
kitchen scraps to the toilet.
Flies may be present in, or
attracted to these items.
3. Use “Compost Sure Blue”.

MECHANICAL TROUBLE SHOOTING
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Symptom
Cause
Remedial Action
P evention
Urine Odor
in
Washroom
Occasional
Urine Odor
Outside
Strong
Sewage
Odor
Fan Noisy
Horizontal runs or
downward slopes
on vent pipe
Fan has failed
Downdraft
Competing
appliances
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.
Compost is
anaerobic
Fan damaged in
shipping or
bearings are
beginning to wear.
Re-install the vent so there are no
horizontal or low points where
condensation can collect.
Have your serial number ready and call
SUN-MAR for a replacement. Instructions
are included with the replacement fan.
If you believe that there may be a down-
draft 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.
(electric)
Install a 12 volt fan in vent pipe.
(CENTREX 1000 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.
1. Check that the vent is installed above
the peak of the roof. If not, extend the
vent. Guide wires may be necessary.
2. Add lime to the evaporation chamber –
as much as you think necessary. 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.
Begin following: “Compost troubleshooting”
suggestions.
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 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.
Install wall brackets on vent
pipe to prevent settling. DO
NOT install horizontal runs
as liquid will collect and
block ventilation, causing
odor.
The fan is a constantly
moving part and has a finite
service life.
Downdraft is dependent on
wind direction as well as
natural obstructions etc.
Initially, install the vent
above the peak of the roof.
If symptoms occur, add lime
or a filter box.
Follow “Ongoing Main-
tenance” and use proper
bulking material
.
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.

- 16 –
Symptom Cause Remedial Action P evention
Fan Not
Working
Liquid
Build up/
Lack of
Evaporat-
ion
Liquid
Overflow
Debris in fan or
mechanical failure.
Increased usage.
Climactic
conditions
Mineral salts may
have accumulated
in the evaporation
chamber over time,
reducing
evaporation rates.
Drains Blocked
Overflow drain not
hooked up
Unit tipped forward
Remove the fan assembly from the unit and
vacuum any dust out of the fan blades.
Check the power source. If this does not
remedy the problem, have your serial
number ready and call SUN-MAR
The amount of liquid varies substantially
between installations. The overflow drain
needs to be installed.
Evaporation rates vary substantially with
climatic conditions. Expect faster
evaporation rates during warm dry weather.
To remove these, fill the evaporation
chamber with very hot water and 1/3 bottle
of “Compost Quick” enzyme liquid. Leave
overnight.
Drain all Liquid through the overflow drain
by tipping the unit up (make sure overflow
is hooked up first)
1. Rake peat moss away from the safety
drains. This is the “build up” area. If
drains are still clogged, proceed to step
3.
2. 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 3.
3. Use a wire to poke blockage out of the
drain assembly. A brown spot will be
visible through the opaque assembly.
Connect overflow safety drain
Check and ensure that the unit is level.
The fan is a continuously
moving part which will
eventually have to be
changed. Do Not turn on
and off daily.
Install the overflow drain.
Rake evaporating chamber
at spring start ups for
cottage use, and once
every other month for
residential use.
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.
3. Use Compost Sure
Blue as a bulking
material.
Evaporation will slow during
damp weather, make sure
drain hose is installed.

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- 17 -
Symptom Cause Remedial Action P evention
Heating
System Not
Working
Liquid in
Finishing
Drawer
Drum Will
Not
Turn
Drum Door
Not
Opening/
Closing
Properly
Test to determine
whether failure has
occurred
Thermostat Failure
Heating Element
Failure
Blown fuse
(some 230V units
ONLY)
Drum Screen
Clogged
Set screw securing
handle to shaft has
broken
Steel roll-pin
securing gear
wheel to shaft has
broken
Drum too full
Hinges Stuck
Pull finishing drawer out and put your hand
in the evaporation chamber (NOT in the
liquid). If there is no warmth rising from the
floor of the unit, 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.
Have your serial number ready and call
SUN-MAR for a replacement. (Detailed
instructions are included with the
replacement part)
If the insulation behind the electric box is
moist or discolored, or heating does not
work after the new thermostat has been
connected, then the heating element has
failed.
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.
Remove the finishing drawer. The drum
screen is located on the bottom of the
patented Bio-drum, to the left of the drawer
opening. Scrub drum screen with a wire
brush.
Drill out set screw and replace, or have
your serial number ready and call SUN-
MAR for a handle replacement kit
(instructions included).
Have your serial number ready and call
SUN-MAR for a replacement small gear kit.
Spray hinges with Compost Quick. Scrub
hinges with toothbrush or other soft nylon
bristled brush.
A ground fault interrupter
circuit is recommended to
protect your CENTREX
1000 Toilet from power
surges that could cause
your heating system to
malfunction.
Your thermostat and fan are
the two constantly moving
parts on the unit, and so are
the most likely to fail.
Both are easy to replace.
If you ever remove the unit
for cleaning, DO NOT use a
water hose around the base
of the unit.
Power surges can cause
the fuse to blow. If this is a
possibility in your area, a
surge protector is re-
commended.
Scrub drum screen with a
wire brush.
Drum should never be more
than ½ full.

Basic Maintenance Inst uctions
Ultra low flush toilet and CENTREX 1000 Units
These instructions are not to replace the owner’s manual, but are intended as simple instructions for
daily use.
USING THE TOILET
Deposit the toilet paper, step on the foot pedal to flush, close the lid and walk away…your job is done.
If you plan on making a more substantial deposit and would like more water in the bowl, simply lift the
foot pedal up and the bowl will fill. When you have the desired amount of water, let the pedal drop
back in place and do what you have to do.
EVERY OTHER DAY
Turn the handle to mix and aerate the compost. If the toilet is being used predominantly for urination,
be sure to add at least one cup of bulking mixture (added at the composting unit) per average amount
of users per day. At the composting unit (not the flush toilet), open the access port to the drum. Add
Compost Sure at the rate of one cup per person per day, so, if there are two people staying, you
would add 4 cups of Compost Sure all at once (2 people x 2 days = 4cups). To avoid messy waste
pipe obstructions, Compost Sure should always be added at the composting unit, not the flush toilet.
Grasp the crank handle and turn in a clock-wise direction for 6 complete turns of the drum. Keep in
mind that one revolution of the drum = 6-7 complete turns of the handle. When the drum has been
turned the required amount of turns, turn the handle counter clockwise until you feel resistance on the
handle. THIS IS REALLY IMPORTANT! By turning the handle counter clockwise, you are centering
the opening in the drum under the waste pipe. To ensure that there are no messy accidents, do not
skip this step!!
CHECK THE VOLUME OF THE BIO-DRUM™
To speed up composting, add one scoop of Microbe Mix every second week, and ensure that the
drum is not more than ½ full.
ATTENTION: the Cent ex 1000 elect ic model must emain plugged in to an
elect ical outlet continuously to function in an odo less fashion. If you will be
away f om the esidence whe e the composting toilet is installed fo longe than
th ee days, the powe may be disconnected while the composting toilet lays
do mant.
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