12 Volt Fan
Installation
(AC/DC and
NE)
Every Sun-Mar AC/DC and NE model comes with a 12 Volt Fan for installation in the 4” stack. Its instal-
lation is required in the following situations:
-If you are installing both 2” (50mm)and 4” (100mm)vent stacks (prevents downdraft from
the 4” (100mm) vent in the AC/DC units)
-If you are in an area where you are subject to downdraft
-If you are using the unit residentially
-If you need to install the vent stack with bends
We include the 12 volt fan with the AC/DC unit because many AC/DC owners do install both vent stacks. It
may also be installed later if you wish simply by cutting a
section out of your vent and replacing it with the fan.
To install the fan initially, pick a spot on the stack that you
can reach easily. In order to get the best evaporative per-
formance from the fan, install it near the composting unit if
possible (remember, the fan will still not be enough to evap-
orate all liquids in a non-electric or DC only environment).
Once you have placed it where you wish, use silicone caulk-
ing, or rubberized couplings, to make the installation airtight.
Do not use glue at this area as you may need to change the
fan at a later date.
The 12 Volt Fan may be powered with a battery that is con-
nected to a generator, solar panel, or other alternative ener-
gy system. For use in AC, purchase a 12 Volt to AC Adapter
from any electrical store and snip off the female end - wire
the positive wire to the red wire on the fan, and the negative
wire to the blue wire on the fan. Tie them off with small wire
connectors, and plug your AC Adapter into the wall.
The 12 Volt Fan should be continuously running if used, as if it is not running it will act as a block in the
vent stack.
Symptom Cause Remedial Action Prevention
Use Sun-Mar Compost Sure Blue
100% wood shavings as a bulking
material.
Rotate the drum as advised. Do not
allow the drum to become too full.
Follow section on moisture in
“PERIODIC CHECKUP”.
Use toilet for urination.
Add correct bulking material.
Be sure to add Microbe Mix packet
at startup.
Install unit in warm area. The
warmer the area, the better your
compost will be! If evening temper-
atures fall below the prescribed
temperatures on a residential unit,
consider installing a heat source on
a timer for evenings.
Never add bleach or cleaning chemi-
cals.
Add water or flush toilet to moisten
compost.
Compost
Too Wet
Your compost
is too wet when
there are
standing pools
of liquid.
Compost will
smell of sewage
and is
anaerobic
Compost
Too Dry
Compost is too
dry when com-
post looks flat
and brown rather
than rich and
black.
Waste not
Breaking
Down at all
If this is the case,
the drum will fill
up quickly
Compost porosity is
poor. Too much
peat moss has been
used as a bulking
material. This is
compacting, pre-
venting liquid from
draining through,
and leaving no free
air space for oxy-
gen.
Drum screen
clogged
Moisture not being
added periodically
or before departure
on cottage units.
Toilet not used for
urination.
Insufficient bulking
material or not
enough peat moss.
Insufficient Microbes
Room Temperature
under 60F/15C
Bleach or other anti-
bacterial chemicals
added.
Compost too dry
For an immediate improvement in porosity add
about 1/2 (2 liters) gallon of wood shavings,
(not anti-bacterial) to the drum.
On an ongoing basis, change bulking material to
Compost Sure Blue or 100% wood shavings.
Remove the finishing drawer. The drum screen is
to the left of the finishing drawer opening. Spray
the drum screen with Compost Quick and let set
for 15 minutes. With a long handled wire brush,
vigorously scrub the drum screen.
Add 1/2 to 1 gallon (2-4 liters)of warm water
to compost in order to bring it up to appropriate
moisture level.
Peat moss retains moisture. 40-60% moisture
content is ideal for aerobic microbes to thrive.
Add Sun-Mar Microbe Mix
Install heat source to increase temperature.
Temperature should be kept above 55-60F/15C
constantly if toilet will be used on an ongoing
basis.
Empty drum. Hose out inside of drum. Restart
compost according to “Initial System Startups”.
Bacteria need moisture to live and move within
the compost. Compost should be quite moist,
40-60% moisture content.
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