Sun-Mar CENTREX 2000 User manual

RATED CAPACITY
Residential & Continuous Use
CENTREX 2000 Electric Units; 4 Adults
CENTREX 2000 NE units: 3 Adults
Weekend & Vacation Use
(Cottage Use)
CENTREX 2000 Electric Units; 7 Adults
CENTREX 2000 NE Units; 6 Adults
Serial No. ______________
CENTREX 2000
OWNER’S MANUAL
PO-MANU0-0609XX
Nov 2011
Rev D8
Product Info: [phone] Fax: [phone] Tech. Service: [phone] Ext 218
E-mail: [e-mail] http://www.sun-mar.com
600 Main St. 5370 South Service Rd.
Tonawanda, N.Y.Burlington, ON
14150-0888 U.S.A. L7L 5L1 CANADA
Standard 41
Certified for liquid containment,
odours, and solid end products in both res-
idential and cottage use
Certified to NSF/ANSI Standard 41
CENTREX 2000
SUN-MAR Corp. warrants the original purchaser that this toilet is free from defects in material and workmanship
under normal house or cottage use.SUN-MAR Corp. will furnish new parts for any part that fails within three years
and five years on the fibreglass tank, provided that our inspection shows that such failure is due to defective material
or workmanship.Any part supplied by us to replace another part is warranted for the balance of the original warran-
ty period.
This warranty does not cover:
1. Damage resulting from neglect, abuse,accident or alteration; or damage caused by fire, flood, acts of God or any
other casualty.
2. Parts and accessories not sold or manufactured by SUN-MAR Corp. or any damage resulting from the use of such
items.
3. Damage or failure resulting from failure of the purchaser to follow normal operating procedure outlined in the
Owner’s Manual or in any other printed instructions.
4. Labour and service charges incurred in the removal and replacement of any parts found defective under the
terms of this warranty.
5. All returns to the factory must be made freight prepaid. All shipments from the factory are made F.O.B.the
factory.
This warranty is in lieu of all other warranties expressed or implied, and no person is authorised to enlarge our
warranty responsibility, which is limited to the terms of this certificate. The Company reserves the right to change,
improve or modify its products without obligation to install these improvements on equipment previously
manufactured.
WARRANTY
CENTREX 2000 NE

Models for which the manual applies:
CCEB-02510 Centrex 2000 115V
CCNB-02540 Centrex 2000 NE
CCEB-02515 Centrex 2000 230V
1 PP-AFCOV-0001XX Cover Plate 16 (Incl. In Heating Element Kit) Insulation
2 AO-ACCEP-0481BX Access Port 17 AO-THERA-0001AX Thermostat
3 PP-BUSH0-0812XX Bushing Threaded
18 AO-HEATE-0311XX Heating Element C9286-1
4 AO-SMALL-0440XX Nylon Drive Gear 19 PM-ALUMS-0811EX Aluminum Sheet
5 AO-SHAFA-0851XX SS Shaft Kit 20 AO-DRUML-0469BX Drum Locker
6 AO-FAN_A-0315KX Fan Assembly (Electric) 21 PP-SCRE00-0821EX Drum Locker Knob
7 PP-GASK0-0188XX Rubber Gasket 22 PP-INTAV-0797XX Air Intake Vent
8 PP_DRUM0-0624CX Centrex 2000 Drum
23 PF-TANKC-0761EX Centrex 2000 Tank
9 PP-BEARP-0758RX Bearing Plate 24 PP-BEARS-0787CX Drum Bearing Strip
10 PP-GASK0-0188BX Rubber U Channel 25 AM-DRUMS-0329EX Drum Screen
11 AP-DRAI0-0306EX Drain Assembly 26 AO-DRUMD-2004EX Drum Door
12 PF-DRAW1-0764EX Centrex 2000 Drawer 27 AO-DRUMD-2004EX Drum Door
13 P0-ELECB-0001AX Electric Box Assembly (Electric)
28 AO-HANDL-3000EX Swivel Handle
14 PF-HEAT1-0760EX Centrex 2000 Heater Tray 28 PP-TOPC2-0802BX Centrex 2000 Top Kit
15 PP-GASK0-0188BX Rubber U Channel 29 PP-TOPC2-0802DX Centrex 2000 NE Top
30 AO-PIPEP-0305XX Pipe Piece Inlet NE 4"
- 21 -
CENTREX 2000 EXPLOSION DIAGRAM & PART NUMBERS
CENTREX 2000 SPECIFICATIONS
Electrical Specifications 115V
Maximum Amps 3.6
Fan Watts
35 req.
(Required)
Heater Watts 370
(When on)
Average Power Use 200
In Watts (Heater on
1/2 time)
Metal tools will damage the body of the unit.

- 20 - - 1 -
OWNER’S MANUAL
CONTENTS
How Composting
Works
The CENTREX 2000
The Patented Bio-Drum
Compost Finishing Drawer
Evaporation Chamber
Inspection
Check for damage
What’s in the box
Familiarise yourself with the
CENTREX 2000
Placement of the Unit
Installation
CENTREX 2000 Rough in
Dimensions
CENTREX 2000 Electric
Installation
Space requirements
Vent Pipe Location
Electrical Considerations
CENTREX 2000 NE Installation
Space requirements
Vent Pipe Location
Installation Common to All
Leading the vent through
the Roof
Leading the vent through
the wall
The Diffusor
Drain Installation
Handling Effluent
Installing the waste pipe
Installing the Ultra Low Flush
Toilet
Start Up and Use
Ongoing Toilet Maintenance
2
3
3
3
3
4
4
4
4
4
5-7
5
6
6
6
6
7
7
7
8
8
8
8
8
8
9
9
10
11
Spring Time Start Up
Winter Use
Removing Compost from the
Bio-Drum
Compost
Troubleshooting
Compost Too Wet
Waste not Breaking Down
Large Lumps In Drum
Drum Too Full
Flies Present
Mechanical
Troubleshooting
Urine Odor In Washroom
Occasional Urine Odor Outside
Strong Sewage Odour
Fan Noisy
Fan Not Working
Liquid Build up/
Lack of Evaporation
Liquid Overflow
Heating System Not Working
Liquid In Finishing Drawer
Drum Will Not Turn
Drum Door Not Opening/
Closing
Basic Instructions
Composting Toilet
Accessories
CENTREX 2000
Specifications
12
13
14
14
14
14
14
14
15-17
15
15
15
15
16
16
16-17
17
17
17
17
18
19
21

Note:
Use “Compost Sure Blue” for optimum results.
HOW COMPOSTING WORKS
Composting is the natural process of decomposition that can be helped along by providing the ideal con-
ditions 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). If the compost becomes too cold (below 55 ° F or 13 ° C),
decomposition will slow significantly or stop completely. 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 fre-
quently. If used for intermittent cottage application (3 - 4 weekends throughout the cold season) no addi-
tional heat is required. The unit will function as a holding tank until the temperature warms up.
Moisture
Moisture is necessary to achieve a 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 a damp com-
post, 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 com-
post, we encourage you to add additional water to the drum.
Carbon/Nitrogen 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 -
ACCESSORY ITEMS FOR THE CENTREX 2000
SUN-MAR has a number of highly specialised composting accessory items. These items may be used to improve
composting.
Name Description Container
“Compost
Quick”
“Microbe
Mix”
“Compost
Sure Blue”
DC Vent Kit
AC Fan Speed
Control
Specially selected natural enzyme solution designed to help the
aerobic bacteria convert waste to compost.
Also very effective as a cleaner for toilet bowls
454g(16oz) bottle with spray cap
Designed for electric units only, the control kit allows users to adjust
the speed of the fan. Ideal for installations where the toilet is used
in winter applications or in bunkies where the toilet may be in close
proximity to sleeping quarters.
Specially selected dried microbes and enzymes designed to start
and accelerate composting in all Sun-Mar composting toilet and
toilet systems.
500g/16 oz. jar with scoop
Bulking material containing 100% chopped hemp stalk to
provide moisture retention, porosity,and free air space within
the compost.
30 litre (8 USG) /bag
Kit required for conversion of electric units to also operate in non
electric or 12 volt mode. For use all CENTREX systems.Includes a
12 volt fan.
- 19 -
AF Waterless
Kit
Purchase of a SUN-MAR dry toilet necessary. This kit will adapt a
Centrex 2000 for use without water.Ideal where water supply is
limited or low output is desired.

Basic Maintenance Instructions
Ultra low flush toilet and CENTREX 2000 Units
The toilet is porcelain and should be cleaned with hot water or bio-degradable products only to avoid
damage to the compost. 'Compost Quick or Baking Soda can be used diluted in hot water.
Weekly maintenance (every second day):
Turn drum to reveal waste inlet hole through access port and add Compost Sure Blue at the rate of 1
cupful (250ml) per person per day.
Rotate handle clockwise to mix contents of Bio-drum and give 6 complete revolutions of the drum -
(36-40 rotations of the handle). Ensure that the drum door opening is in the vertical position at the
end after hearing the 'click' of the catch.
Spray Compost Quick into the drum before and after mixing.
Check compost volume and condition in 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.
Bi-Monthly maintenance and emptying cycle:
Rake out evaporation chamber with rake provided (the area below the finishing drawer). Clean the
drum screen. Remove the finishing drawer, the drum screen is to the left of the drawer on the bottom
of the drum. 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 a the wire brush. If
brushing the screen does not clear it and liquid is still not draining through the screen, use a screw-
driver or nail to puncture each hole in the drum screen.
Attention: the Centrex 2000 electric model must remain plugged in to an electrical outlet continuously
to function odorlessly. If you will be away from the residence where the composting toilet is installed
for longer than three days, the power may be disconnected while the composting toilet lays dormant.
The CENTREX 2000
The key to the success of the CENTREX 2000 lies in it’s three chamber design. Each of the three chambers; patent-
ed Bio-drum, compost finishing drawer,and evaporation chamber,have their own independent environments for
optimum efficiency.
The CENTREX 2000 electric version has a thermostatically controlled heater and fan assembly to help evaporate liq-
uid and should be used where there is a constant electrical supply. The CENTREX 2000 NE (non-electric) version
is for use where there is no continuous electric supply. The CENTREX 2000 NE has no fan or heater.Odorless oper-
ation is achieved by a 4” vent which acts like a chimney creating a partial vacuum within the unit.
The Patented Bio-Drum
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 Drawer
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 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 evapo-
ration. 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 -
- 18 -
Bio-Drum
Finishing Drawer
Evaporation Chamber

Inspection
We recommend an inspection of the CENTREX 2000 prior to installation and to make sure you have
received all of the parts required as listed below.
Inspecting
the unit for
damage
What’s in
the Box
Familiarise
Yourself
with
CENTREX
2000
Placement
of
Unit
i) 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.
ii) If the shipper has left-
Report the damage immediately to the transport company and call Sun-Mar.
iii) Soon after delivery, remove the CENTREX 2000 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- 4” Diffusor (100mm)(Electric)
1- Warranty Card1- 6” (150mm) Diffusor (NE)
1- Hardware Kit 6- 2” x 30” (76.2cm)PVC Pipe (Electric)
1- 8’ 4” (254cm)1” ID Drain Pipe 2- Compost Sure Blue
1- Rake
5- 4” x30” (10.16 x 76.2cm)ABS Pipe (NE)
i) 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.
ii) Lift and remove the access door and rotate the drum until the drum opening is visible through the
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.
iii) 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.
iv) Pull out the compost finishing drawers at the bottom right 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 from reaching it. Do not install the unit in
a pit where water can accumulate around it.
Symptom Cause Remedial Action Prevention
- 4 -
Evaporation will slow during damp
weather,make sure drain hose is
installed.
A ground fault interrupter circuit is rec-
ommended to protect your CENTREX
2000 from power surges that could
cause your heating system to malfunc-
tion.
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 from the
bathroom 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 serge protector is recommend-
ed.
Drum should never be more than 1/2
full.
Connect overflow safety drain
Check and ensure that the unit is level.
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 heat-
ing 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 thermostat access cover 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
chared 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 replace-
ment kit (instructions included).
Have your serial number ready and call SUN-MAR for a
replacement Small Gear Kit.
Drum Hinges have compost caked on them. Spray
with Compost Quick and clean with nylon brush.
Overflow drain not
hooked up
Unit tipped forward
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
Liquid
Overflow
(Cont’d)
Heating
System Not
Working
Liquid in
Finishing
Drawer
Drum Will
Not Turn
Drum Door
Not
Opening/
Closing
Properly
- 17 -

Symptom Cause Remedial Action Prevention
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
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 condi-
tions.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,
unkink 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. You will notice if this is clogged because
you will see a brown spot through the opaque
assembly.
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 vigorously
at spring start ups for cottage use,
and once every other month for resi-
dential use.
1. A clogged drain is not very likely
to happen if you rake your evapo-
rating chamber 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 your
bulking material.
Installation
CENTREX 2000 ROUGH IN DIMENSIONS
- 5 -
- 16 -

- 6 -
Symptom Cause Remedial Action Prevention
Urine Odour
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 ship-
ping 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 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. (electric)
Install a 12 volt fan in vent pipe. (NE)
Wood stoves or furnaces installed in a tightly sealed
room with the composting toilet may draw air in caus-
ing 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” sugges-
tions.
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 pre-
vent settling.DO NOT install horizontal
runs as liquid will collect and block ven-
tilation, causing odour.
The fan is a constantly moving part and
has a finite service life.
Install an air intake to the competing
appliance from the outside.
Downdraft is dependent on wind direc-
tion 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 Maintenance” and use
proper bulking material.
Clean the fan with a small brush and/or
compressed air nozzle once a year. To
do this, remove the fan assembly by tak-
ing offthe snap cap covers and
unscrewing the screws which hold it in.
The entire assembly will then simply
slide out. This will prevent wear and
lengthen the life of your fan.
- 15 -
1) Compost will be removed from the finishing drawer.Ensure that there is at least 17” in front of
the CENTREX 2000 so that the drawer may be removed from the unit.
2) 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.
5) Ensure that the CENTREX 2000 is accessible for ongoing maintenance.
6) Ensure that the installation area is a minimum height of 28”. WE DO NOT RECOMMEND
DIGGING BELOW GROUND TO FACILITATE THE INSTALLATION OF THE CENTREX 2000.
7) Ensure the CENTREX 2000 is protected from precipitation.
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. THERE SHOULD BE 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 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.
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.
Space
Required and
other
Installation
Considerations
Vent Pipe
Location
Electrical
Considerations
MECHANICAL TROUBLE SHOOTING
CENTREX 2000 Electric Installation

- 7 -
- 14 -
1) Compost will be removed from the finishing drawer.Ensure that there is at least 17” in front of
the CENTREX 2000 NE so that the drawer may be removed from the unit.
2) 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.
5) Ensure that the CENTREX 2000 NE is accessible for ongoing maintenance.
6) Ensure that the installation area is a minimum of 28” in height. WE DO NOT RECOMMEND
DIGGING BELOW GROUND TO FACILITATE THE INSTALLATION OF THE CENTREX 2000 .
1) All vent should be vertically installed.
2) Limit bends in the vent stack to no more than 2 - 45 ° bends. THERE
SHOULD BE 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 odorlessly.
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 for the 4” vent so that the 1” of
smaller diameter pipe is protruding into the hole in the top of the unit. This
is the first piece of the venting.Once you have finished assembling the vent,
you should run a bead of silicone around the inlet coupling to prevent odor
from escaping.
Use Sun-Mar Compost Sure Blue
Add water to patented bio-drum
Be sure to add ½ 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 com-
post 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 a dry compost, due
to the fungus which begins to form
on the surface when it dries out. A
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”.
Symptom Cause Remedial Action Prevention
Compost
Too Wet
Waste not
Breaking
Down at all
If this is the case,
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
-kitchen/garden
waste added
-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 con-
stantly 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 drum is only half full or less.
Rotate compost thoroughly to aerate,and add com-
post 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 composter is
not a health concern because all SUN-MAR units are
vented. If using pesticides, avoid spilling on the outer
shell of the composter.
Space
Required
and other
Installation
Considerat-
ions
Vent Pipe
Location
Vent Inlet
Coupling
Compost Troubleshooting
CENTREX 2000 NE Installation

Leading the
vent
through the
roof
Leading the
vent
through the
wall
The Diffusor
Drain
Installation
Handling
Effluent
Removing Compost from the patented Bio-Drum
As shown in the installation, the vent stack should end about
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 2” 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 slighly higher then
the inner hole so that the vent pipe will be angled upward at a 45°.
If installing through an exterior wall, waterproof sealand 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 should be connected as it will be required.
- 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 clam with the 1” SS hose clamp.
- Connect the 1” hose to an approved drainage facility.
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.
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The drum lock button is located
below the handle.Pull the but-
ton out approximately 1/2” and
hold.
While holding the drum lock but-
ton out, turn the handle count-
er-clockwise for three revolu-
tions 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 your
rake to level the compost.
Compost should now be allowed
to rest in the drawer for 3 - 4
weeks to finish the composting
process.
Pull the
drum lock
button
Turn the
handle
counter-
clockwise
Level the
compost in
the drawer
Allow the
compost to
rest
The level of compost in the Bio-drum should never be more than half full. As a guide,the compost in the drum should be at
least 6 inches from the bottom of the drum door.Compost must be removed from the drum by following the steps outlined in
this section.
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 com-
post to fall into the finishing drawer. Fresh
and composted material will be deposited into
the drawer.
Levelling the compost will prevent the com-
post 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 com-
posting.
Compost maybe be removed at any time that you may need more space in the drum and will need to be removed more fre-
quently for heavily used units or where the CENTREX 2000 is the primary residential toilet.
Installation Common to All

- 12 - - 9 -
Installing the
waste pipe
Installing the
Ultra Low Flush
Toilet
When installing the waste pipe from the toilet to the unit, the following should be considered:-
i) 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.
ii) Pipe should not slope upwards at any point.
iii) Connections should be snug so that waste does not cause blockage.
iv) 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.
v) 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.
vi) Insulate pipe if unit is to be used during the winter.
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.
Seasonal Use and Spring time 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 completely and use the rake tool to rake any loose material from the floor of the unit. Pay careful
attention to the left two corners of the unit (near the safety drain) to ensure that your drains do not get clogged.
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 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.
Winter Use
No Winter 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 Winter 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), com-
posting 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 or Residential Winter 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.

Start Up and Operation
Initially, when starting up your CENTREX 2000, follow these steps. These steps are only used when
starting up your CENTREX 2000 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 to condition the
surface of the composting toilet. Remove
the finishing drawer and spray the whole
inner floor of the unit under the finishing
drawer. Spray Compost Quick into the
Bio-drum and the inside of the finishing
drawer.
Step 2: Pour one bag of Compost Sure Blue into
a bucket and add 2 quarts of warm water.
Add ½ 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 from the
bucket into the Bio-Drum through the access
door on the CENTREX 2000. Rotate the drum
to mix.
Step 4: If the unit is electric,plug it in to a three
prong electrical outlet. The fan will run continuously
24 hours per day while the unit is being used. The
opening in the drum must remain open under the
waste pipe. The CENTREX 2000 is now ready for use.
When you first start up the CENTREX 2000, 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 a 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 colour.
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.
Ongoing Toilet Maintenance
Once your CENTREX 2000 is installed and you have gone through the initial start-up procedure, follows the steps
outlined below to keep your composting toilet working optimally.
- 10 -
Add one cup of Compost Sure
Blue per person per day
Spray Compost Quick on the sur-
face of the compost
Turn the handle clockwise every
second day to mix the compost
Make sure that the opening in
the drum is centered under the
waste pipe .
Every two weeks
Every three months
Twice per year
Periodic 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 on the CENTREX 2000.
Every second day before turning the handle,spray 3-4 sprays of Compost Quick on the sur-
face 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 (36 turns of the handle).
Turn the handle in a counter-clockwise direction until it comes to a hard stop. The drum
opening should now be centered under the waste pipe.
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 two
corners of the unit near the safety drain 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 vig-
orously 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 it is time to remove compost. To
remove compost from the drum:
1) Pull the drum lock button located below the handle on the CENTREX 2000.
2) While holding out the white drum lock button, turn the handle in a counter-clockwise
direction for one complete revolution of the drum.
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 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 -