Earth Stove MP35/50 Owner's manual

Installation And Operation
Instructions
"linisappliance must be Installed by a qualified technician.
Read thoroughly before installaMon.
Save this manual for future reference.

TABLE OF CONTENTS
Safety Notice ....................................... 1
Introduction ........................................ 2
Operation ........................................--4
Maintenance ......................................- 8
Installation ......................................... 12
Troubleshooting ...................................-18
Power Flow Diagram ............................... 20
Wiring Diagram .................................... 21
Glossary --'- ........ ................................. 22
Specifications ...................................... 23
Component Diagrams .............................. 24
Warranty .......................................... 25
Safety/Listing Label ................................ 26
Service/Maintenance Log ........................... 27
'4
p/n 16482 Rev. 10/97

.
.
•IMPORTANT SAFETY NOTICE
PLEASE READ BEFORE ATTEMPTING TO BURN!
CAUTION: If this stove is not properly installed, a house fire may result For your safety,
follow the installation directions; contact local building officials about restrictions and
installation inspection requirements in your area.
Installation of this stove must comply with
local codes. A building or installation permit
may be required. Be sure to check with your
local building official or fire department
before installing.
11.
If utilizing an existing chimney have your
fireplace flue or chimney system inspected by
a qualified person prior to installation of the
stove. Make any necessary repairs before
installing.
Terminate pellet vent pipe so that contact
with humans or possible damage to pipe is
avoided.
12. Required fuel is: 1/4" diameter wood pellets,
1" ma_cimum length, 8500 BTU per pound,
10% maximum moisture content, 1 1/2% -
3% ash. Corn kernels, 10,000 BTU per
pound, 15% maximum moisture content.
(Optional Cornpot and metering cup filler
plug required).
.
.
D
6.
.
So
.
Never connect stove flue to chimney being
presently used by another appliance.
Never block any air intake or air outlet
ports. Dangerous overheating can result.
Do not install this stove in a sleeping room.
Never connect the stove to an air duct
system.
Never stack or pile combustible materials
against the stove or around external vent
termination.
To avoid burns, children and adults should
be alerted to the hazards of high surface
temperatures.
To provide reasonable fire safety, install a
smoke detector and a conveniently located
fire extinguisher.
13. Do not attempt to burn cordwood or pressed
logs in this stove, severe damage or fire could
result.
Testing/Listing
The Earth Stove model MP35/50 pellet fired
appliance has been constructed, tested and listed
for use in residential construction in accordance
with the applicable portions of the following
standards - UL1482, UL127, UL103 or UL641,
UL507 and UL39i and for use in manufactured
dwellings and park trailers according to OAR
918-520-010 through 918-520-110, by Pacific
Inspection and Research Laboratory, Inc.,
(PIRL) Redmond, WA 98052. Listing file
89-174.
Based on a tested air to fuel ratio in excess of
35:1, this appliance is not an effeeted facility
under the EPA regulations for wood burning
stoves.
10. In the event of a chimney fire, notify the fire
department, and unplug the stove.
Page I

INTRODUCTION Read Entire Manual Before Attempting to Burn
Three Pronged Plug (Grounded) Ash Drawer
Your stove has aprinted circuit board and other
electrical components that require a grounded circuit
and proper polarity. Purchasing a surge protector
provides additional insurance against unnecessary
problems.
Control Panel/Fan Rheostat
The ash drawer located in the front of the pedestal is
designed to make cleaning easier by containing the
ashes in a removable drawer. It is accessed by
turning the spring loaded screws located on the ash
drawer cover. Do not operate the stove with the ash
drawer open or ajar. Replace gasket material as
necessary to insure a tight seal.
The primary control .board manages the performance
of your stove. It allows you to regulate the fuel feed
rate, the draft fan voltage and main power to the
stove. The room air fan rheostat allows you to
manually regulate the fan speed except when the
automatic high speed override is engaged.
Firepot
Decorative Logs
An important feature of your NaturalFire stove is
the realistic fire created by the flame spread firepot
and the refractory logs. Although the logs are quite
durable, they should be handled carefully, as they
retain heat for a considerable period of time, and if
dropped can break.
The pellet firepot is where the fuel is burned.
Although ithas a self cleaning capability for much
of the ash build up, variable fuel quality (ash
content) and extended periods of a low burn rate
will .necessitate some manual cleaning. An Earth
Stox_e firepot cleaning tool is highly recommended
,(part#1000).
Hopper
The hopper is where the fuel is stored before it feeds
into the stove.
Placement of the logs is important in achieving a
realistic fire. One recommended pattern is pictured
below which allows you to use a Firepot cleaner
without having to remove the logs (except for full
maintenance).
Page 2

INTRODUCTION
How It Works
The fuel metering cup rotates in the throat of the hopper
providing a measured amount of fuel based on the set feed
rate. The fuel drops into the anger tube where it is moved
into the firepot. The draf_ f_n provides combustion air
through the _.ger tube and a series of holes in the inner
firepot, to allow for complete combustiom
The flame and hot gases provide heat to the heat exchange
tubes lorm_ in the upper chamber of the stove. The
room air fan extracts the heat and delivers it to the room,
along With the natural radiant heat from the glass and
metal surfaces.
Gold Door
Your Earth Stove's gold door frame should be cleaned
thoroughly With agood window cleaning solution and a
soft cloth BEFORE the stove is burned. Do not use any
metal polishes or abrasives to clean the door. Any oils or
finge_v_ints leg on the gold could become Iw.u_ent
blemishes if the stove is burned prior to _ removal.
Atkrr the first few fires the gold will cure.
Glass
The glass is asuper heat resistant ceramic that withstmds
continuoustemperatums upto 1390° F. This temperature
is well beyond the temperatures in which you operate
your stove.
This appliance is designed to provide aflow of air over
the inmde of the El_% which along with high heat helps
keep it clean. When operating the stove on low for
extended periods of time, the gl___ may get dirty. A
commercial _I_ cleaner designed for stoves is
recommended for cleuning.
The glass should be cleaned thoroughly with glass cleaner
and asoft cloth BEFORE the stove is burned.
Marble Set
Marble is a natural product so each piece will have its
own unique chamc_. Marble may be cleaned With a
damp cloth toremove oils or dust. Be sure toinstallthe
four cerawool strips (under the rfiarble) to protect it Do
notputro_ objects(suchas_vets,steamers,hopperlid,
etc.) on the _. Do not install the marble before
curing the paint
Remote Wall Thermostat
One way to maxim_ the efficiency and convenience of
your stove is to install are.mote wall thermostat. A
Honeywell T87F 24 volt thennostat is recommended (see
page5).
Corn Pot
NaturalFire pellet stoves will bum most types of corn with
the _aa_fion of a corn pot kit. For dtcmils, see the section
on burning com.
Several options are availal, le to enhance your NaturalF'ge pe[l_ stovz Please see your local d..-br for further
inform_m_'_om
Page 3

OPERATION
Before Attempting To Start Your Stove, Read This Manual Thoroughly. Have Your Stove Pretested and
Professionally Installed.
Start Up Procedure
1. Plug in the stove. Fill hopper with pellet fuel.
2. Turn the Main Power Switch to the "Feed
System" position.
3. Provide starting fuel by pushing the "Start
Button" and allow fuel to feed for approximately
five minutes (or put approximately two cups of
fuel directly in the Firepot).
4. Turn the Main Power Switch to the "Off'
position. (This will stop the fuel feed.)
5. Open fire door and apply Fire Starter gel to the
fuel in the Firepot, then light. Allow the fuel to
burn for five minutes with the door slightly ajar.
Shut Down Procedure
1. Turn the Main Power Switch to the "Draft
Fan" position. If using a remote
Thermostat, turn the Thermostat down.
2. When the fire in the Firepot goes out
completely, shut the Main Power Switch to the
"Off" position.
WARNING: IF THE POWER SWITCH IS
TURNED OFF PREMATURELY WHILE A FIRE
IS STILL ACTIVE IN THE FIREPOT, THIS MAY
RESULT IN SMOKE BACK INTO THE
DWELLING (THIS WOULD DISSIPATE
RAPIDLY).
Pellet Fuel Calibration *
6. Close the door.
7. Turn the Main Power Switch to the "Feed
System" position, then push the Start Button.
8. 'Set the Fuel Rate Switch to the "Full" position.
If using a remote Thermostat, adjust it to'the
desired room temperature.
9. As the stove tem]?erature rises, the Room Air
Fan will automaucally engage. At that point,
adjust the Fuel Rate Switch to the desired
setting. During the start up procedure or when
running the stove on a "Low" Fuel Rate Setting,_
the Room Air Fan Rheostat must be in the off
position. Failure to do so could cool down the
stove and it will automatically shut off.
10. If the fire goes out, go back to step two again.
The MP35/50 is shipped from the factory, set to
50,000 BTU input. To adiust to 35,000 BTU input,
install the 1/8" filler plug into the fuel metering cup.
35,000 BTU - 1/8" filler plug
50,000 BTU - open
Filler Plug Installation
Place the filler plug into the bottom of the metering
cup fuel cavity and secure with the screw provided
into the tapped hole.
Page 4

OPERATION
Control Board
A. Main Power Switch
The main power switch is athree way toggle with
the following positions:
1. Off(stove off)
2. Draft Fan -aUows the draft tim to operate
alone during shut down.
3. Feed System -stove on
B. Fuel Rate Switch
The fuel rate switch controls the amount of time
the burner feeds fueL It can be set to the
following threepositions:
o
2.
°
Full -will feed fuelcontinuously.
Medium - will feed fuel approximately
two minutes on then two minutes oE
Low -will feed approximately one
minute on then _ minutes Off..
C. Draft Fan Switch *
The draft fan sSwitoh conlrols the amount of air
used for combustion during piloting process. It
can be set to the following three posifiom:
1. High -runs at 75% of capacity when
stove is not feeding fuel.
2. Low- runs at 50% of capacity when
stove is not feeding fuel.
3. Off- runs at 0°,4 of capacity when stove
is not feedin_ fuel.
*The dmR fan will nm at 100% of capacity
during the feeding of fuel.
D. Start Button
Depress the start button to allow fuel to feed for
approximately 12 minutes (used during start up of
thestove).
E. On/OffLight
The On/Off Light blinks to indicate electricity is
flowing through the primary tonal boar&
F. Fuse
The Fuse protects the Primav/ Control Board
fi_m power "surges or spikes".
Optional Remote Wall Thermostat
One way to maximize the efficiency and convenience of
your stove is to install a icmote wall thermostat. A
Honeywell T87F 24 volt thermostat is recommended.
Follow the m_nuf_etu_s installation insm_ons using
18/2 stat wire. The leads from the stove are the yellow
wires found behind the Primary Control Board.
Once you have installed the Th_m_ostat, the Fuel Rate
Switchshould be set to"Low". This will be the rate the
stove will run on pilot when the Thermostat is not cMllng
for heal
Page 5

OPERATION
Room Air Fan Rheostat
The room air fan rheostat can be used to vary the
speed of the room air fan by rotating it to the
desired setting. When the stove is very hot
(running on high), the rheostat override (fan speed
disc) will automatically run the fan on high to
prevent the stove from overheating.
•"¢
Normal Operating Sounds
Heat Exchange Tubes -As the room air fans
increase in speed, you may hear air flowing through
these tubes and out into the room.
Thermostatic Control Disc - There are four
different heat activated temperature discs on the
insert. The discs can make alight clicking sound as
they cycle while the insert heats up or cools down.
Room Air Fan - The modern, high efficiency fan
may have a hum or pulsating sound, particularly on
the high setting. The sound may change as the fan
speed is varied.
Auger Feed System -When fuel is fed from the
hopper to the auger tube, a light clinking sound of
the fuel being cut may be heard.
Auger/Cup Motor(s) - When feeding fuel, you
may hear the intermittent buT7 or hum of these
motors.
Draft Fan -This motor runs at various speeds to
provide combustion air to the firepot (and to aid in
the draft of the flue). The speed of this motor wiU
,increase with the feeding of fuel.
Page 6

OPERATION
Burning Corn (Optional)
Natural Fire pellet stoves will bum most types of
corn with the addition of a compot kit. Ris not
necessary to mix corn with wood pellets however,
wood pellets are required to start the fire.
NOTE: Burning treated seed corn is never
recommended
The compot kit consists of:
1 1/8" Filler Plug
1 3/8" Filler Plug
1 Compot
To install the cornpot, simply remove the screw(s)
from the top of the auger housing and lift up and out
on the firepot. Slide mounting flange of the cornpot
over the auger housing and replace screw(s).
Initially the air shutter on the draft: fan should be set
at 1/2 open and the draft fan selector on "LOW". If
more or less combustion air is needed, adjust the air
shutter accordingly to achieve a bright yellow flare e.
Because corn size and density varies, it will be
necessary to calibrate the fuel metering cup in order
to maintain rated BTU input and prevent overfiring.
This requires the installation of the filler plug in the
fuel metering cup. Use the 3/8" filler plug provided
in the compot kit.
The moisture content of the corn should be 15% or
less, and care should be taken to ensure that there
are no foreign objects in the corn (i.e. sticks, stalks,
cob parts, etc.). When burning corn, the primary
combustion takes place on a bed at the bottom of the
compot.
The compot has a solid bottom and sides with air
holes because burning corn forms afluid-like
residue which becomes solid when cool. The
cornpot cleaning will depend upon the quality and
quantity of corn being used. The compot should be
cleaned when the build up starts to reach the bottom
air holes inside of the compot. You will need to
remove the ash, and in some instances a white
calcium like deposit. The stove must be shut down
and cooled before cleaning.
CORN BURNING SHOULD BE DONE IN TOP
VENT INSTALLATIONS ONLY. .If the
installation must elbow into a wall thimble, the
horizontal mu sl_ould not be more than 24". The use
of a wall mounted thermostat, part #CTR140 is
suggested.
Start Up Procedure
We recommend starting a corn fire with wood
pellets because corn has adense shell that can be
difficult to start. Manually fill the cornpot, to the
bottom of the auger tube, with wood pellets. Use of
the start button feature is not recommended when
initially starting the unit for corn burning. (See
"Start Up Procedure" in the Operation section for
additional start up information).
Page 7

MAINTENANCE
Ash Removal and Disposal
CAUTION: BE SURE THE FIRE IS OUT AND
STOVE IS COLD BEFORE REMOVING
ASHES! NEVER BURN YOUR STOVE WITH
THE ASH DRAWER OPEN.
Ashes can hold live embers for several days, and
must be disposed of with care. Be certain the fire is
out before you remove the ash drawer. Brush ashes
into the ash drawer. After emptying, clean and
replace the ash drawer and tighten the spring loaded
screws. NEVER Elace ashes in a cardboard box or
any other combusUble receptacle. Place the ashes in
a metal container with atight fitting metal lid. The
closed container should be stored on a
noncombustible surface, away from combustible
materials. Keep the ashes in the closed container
until you are certain all the cinders have completely
cooled. Replace ash drawer gasket if it becomes
damaged.
Paint
Your stove finish is a high temperature paint that
•requires time and temperature for the silicon resin in
the paint to completely cure. Depending on your
use, this may take afew hours or a few days. The
paint manufacturer recommends you ventilate the
house during the initial bums. Although the
emis'sion is primarily Carbon Dioxide, there are
other components emitted which make it smell bad
and may irritate some people. Do not place
anything on the stove surface until the paint is
completely cured, as it will become soft durin_ this
process. Do not attempt to repaint the stove unul the
_aint is completely cured. If the surface later
ecomes stained Or marred, it may be lightly sanded
and touched up with spray paint trom the same paint
manufacturer, paint is available at your local
dealer.
KEEP YOUR HOUSE WELL VENTILATED
DURING THE CURING PROCESS. THE
CHEMICAL SMELL AND BLUISH HAZE
EMITTED BY THE CURING PAINT CAN BE
QUITE NOTICEABLE AND MAY SET OFF A
SMOKE DETECTOR.
Fan(s)
At least once each year, check the room air fan and
draR fan inlets for deposits from carpeting, pet hair,
furniture coverings, etc. Use a brush and/or light
vacuuming for cleaning.
Door Gasket
Aspun fiberglass gasket (3/4" in diameter) provides
the seal around the fuel door. Should this become
frayed or ,damaged it should be replaced. Spun
fiberglass rope" gasketing can be purchased from
your dealer or some hardware stores. It must be the
same diameter as the original. Use high temperature
(RTV) silicone sealer as an adhesive.
WARNING: MAINTAIN THE DOOR SEAL IN
GOOD CONDITION. DO NOT LEAVE THE
STOVE BURNING WITH THE DOOR OPEN OR
AJAR. DO NOT USE ANY TYPE OFARRASIVE
CLEANER OR POLISH ON GOLD PLATING.
Creosote Formation and Need for
Removal
If your stove is properly adjusted, very little
creosote will develop in your flue system. If
creosote begins to develop, it is likely that poor
adjustment or needed maintenance is causing
incomplete combustion of the fuel. Be sure your
draft fan switch, and draft fan shutter are set
properly.
What causes creosote is the moisture content of fuel
verses the rate at which it is burned. Piloting astove
on low feed rate for long periods of time, causes
incomplete combustion, cre.atin_ vapors which may
condense in a relatively cool chimney, thus forming
creosote. These deposits tend to form in long runs
of venting where gases cool prior to exhausting.
Soft fly ash is a normal by product of bumingpellet
fuel, and Can accumulate in your flue system. Using
lower grade fuel will increase the frequency of
cleaning that wiU be needed. Check your flue
regularly (at least once a month) until a schedule can
be established for your installation and fuel quality.
Remember, during high use periods to increase your
inspection cycle.
Note: Single wall pi]_e cools rapidly, therefore
installations using this type of flue are more
susceptible to creosote deposits.
Page 8

MAINTENANCE
Refractory_ Logs
The following steps will insure the longevity of
your logs:
1. Never attempt to handle the logs while they are
hot.
.Carefully remove logs from firepot when the
stove is cold. Remove ashes from the firepot.
Then carefully place the logs into their proper
position (see page 2).
Firepot
Keep the firepot inner holes free of obstructions
(buildup). Remove the flrepot and empty it when
this occurs.. The quality and quantity of pellets
used will dictate the necessary cleaning. Remove
clinkers or carbon build up.
Clinkers are abyproduct of the fuel. Silica (or dirt)
in the fuel, along with other impurities can fuse
under heat and cause clinkering. Clinkering is a
function of the fuel, not the stove. A clinker should
be removed using a clean out tool.
Cleaning the MP35/50
.Turn the unit off two to three hours before
cleaning to allow the unit to cool (see Shut
Down Procedure).
2. Place protective floor covering around the
front of the stove.
o
,
.
.
o
Remove ash drawer and empty ashes into your
noncombustible container. Dispose of ashes as
previously described (see Ash Removal and
Disposal). Clean any remaining ash from the
firebox and ash drawer area.
After the stove chimney has been swept, the
top/rear chimney seal off plate needs to be
pulled off of the stove to vacuum the unit out.
There is a baffle plate beneath the heat
exchange tubes. Fly ash will acel_mulate on
this plate and must be removed to ensure flail
efficiency. To clean, remove the baffle plate
and pull the cleaner plate all the way forward
and then return to the rear of the firebox.
Remove the clean out access cover and
vacuum out the fly ash (see page 10).
Reinstall your firepot being sure that the auger
tube protrudes about 1/8" into the firepot,
Replace baffle and clean out access. Reseal
and secure stove chimney.
The cleaning frequency will be dictated by the
quality and q, antity of the fuel burned. The
following is the suggested schedule to
establish a minimum: A_Rer every 1/2 ton of
pellets, when the metal surfaces of the
exchange tubes are no longer visible, or after
every 2-3 weeks of use.
3. CAREFULLY remove the decorative logs
from the firebox and set them aside.
4. Remove the firepot by removing screw(s)
from the auger housing and pulling up and out.
Page 9

MAINTENANCE
Top Chimney Outlet
Upper Baffle Plate
Heat Exchanger Tubes
Lower Baffle Plate
Clean-Out Access
-Firepot
Page I0

MAINTENANCE
Maintenance Requirements
As with all appliances, periodic maintenance is required to keep them operating at optimum efficiency.
We recommend an annual maintenance service by a qualified technician.
Maintenance Related Problems
Problem: Decrease in heat output or incomplete
combustion.
Solution: See maintenance points A, B, C, D&E.
Problem: Decrease in Room Air Fan velocity.
Solution: See maintenance point D.
Problem:
Solution:
Noticeable change in Room Air Fan
noise.
See maintenance point D.
Problem:
Solution:
Stove smokes or odor in home.
See maintenance points A, B, C,E, G &
H.
Problem: Flames appear to bum lazily.
Solution: See maintenance points A, B, C&E.
Problem:
Solution:
Pellets stick to inside surface of hopper
(additives in fuel bonding to paint).
See maintenance point I.
Recommended Maintenance Points
A. Once for every 1/2 ton of'fuel burned,
remove all dust and flue ash from Heat
Exchange Tubes and Baffle areas using the
cleaner plate.
no Remove and clean the Firepot. Keep inner air
holes free from buildup. Remove ashes from the
Ash Drawer weekly or as fuel dictates.
C. Clean chimney, cap and exhaust passageway
annually or as needed. Inspect monthly.
D. Vacuum air intake and squirrel cage on Room
Air Fan annually.
E. Clean squirrel cage on Draft Fan annually.
F. If Remote Thermostat is used, remove cover and
clean contacts annually.
G. Replace Door Gasket as needed.
H. Replace Ash Drawer Door Gasket as needed.
Ig Clean inside surface of hopper with agood
window cleaning solution, then apply a non-stick
spray (i.e. Teflon Spray). Do not use vegetable
or oil based sprays.
If solutions fail to cure problem, See Trouble Shooting Section.
Page 11

INSTALLATION
Recommended Pre-Installation Procedure
NOTE TO INSTALLER: Before the unit is 5.
installed it is recommended that the unit be
pre-buraed to verify the operation, to bum off oils
that are sometimes found in the heat exchange tubes,
and to cure the paint. The "Pre-lnstaIiation 6.
Procedure" should be done in a well ventilated area
as follows.
i.
,
3.
.
Remove the baffle plate from the pallet and
place it on the brackets inside the stove. The
brackets are located below the heat exchange
tubes at the rear and above the door at the from.
Make certain the baffle plate is placed all the
way to the rear and left hand side of the unit and
not centered. The heat exchanger cleaner plate
han_es should fit into the two notches in the
baffle plate
Plug the stove into agrounded oulet (using a
circuit tester, verify the electrical outlet for
proper ground and polarity where the unit will
be installed. Failure to do so could result in
damage to the electrical components and void
thewarranty).
Check the shutter on the dra_ fan and make sure
it js set at 1/2 open (once installed the actual
setting will depend upon the dra_ of the flue).
On the primary control board, A) set the main
power switch from "Off" to the "Draft Fan"
position and B) put the fuel feed rate on "Full".
The draft fan should now start. Open the door,
place your hand over the firepot and see if the
draft Fan is forcing air into the firepot. Turn the
main power switch to the "Off" position.
Turn the rheostat "On" to see if the room air fan
ram_..After checking the fan, turn the rheostat
"Off".
Look down into the hopper, and make sure
nothing is obstructing the fuel metering cup.
Pour 1/4 bag of pellets in the hopper.
With the main power switch in the "Feed
System" position, push the start button. Allow
fuel to feed for approximately five mirLutes or
add two cups of pellets by hand to the center of
the firepot (see page 4, item 3). Put the main
power switch in the "Off" position. Apply
non-volatile lighting material to the pellets and
light it with a match. Let the fuel bum for five
minutes leaving the door slightly ajar.
.Close the door and set the main power switch to
the "Feed System" position, and the fuel rate
Switch to the "Full" position. Push the start
button. The draft fan will run at high and .the
flame will increase (a full flame will need to be
established in the firep0t before normal
operation can be maintained.
,Once running, observe the stove operating for
15-30 minutes.
9. As the stove temperature rises, the room air fan
will automatically be engaged. Set the rheostat
to the desired speed.
10. If necessary, adjust the _ fan shutter to bring
the fire to a bright yellow flame (the average
installation will be 1/2 way open).
1I. Once the stove is operating properly, complete
filling the hopper and run the unit for 30
minutes.
Page 12

INSTALLATION
Vent Termination Requirements
The termination of the outside chimney of the
_oellet stove shall be located in accordance with the
llowing:
1. Higher than 3 ft. above any forced air inlet (air
conditioner, etc.) located within 10 ft.
2. Not less than 4 ft. below, 4 ft. horizontally
from or 1 ft. above any gravity air inlet
(door, window, etc.).
3. Not less than 2 ft. from an adjacent building
and not less than 7ft. above grade when
located adjacent to the public sidewalks
(access).
4. Not less than 3 ft. below an eave or any
construction that projects more than 2" from the
plane of the wall.
Corner
I
Rear Wall or Alcove
Note: Do not use class B venting intended for gas
appliances as a chimney or connector pipe on a
pellet fired unit.
Minimum Clearances to Combustibles
Side: 12"
Back: 1"
Front: 48" horizontal from door
Single Wall pipe: 9"
Maximum horizontal run: 36"
Offsets allowed: 2 I,
*- 12" Min.
.......... i
48" Min.
12" Min..=.)
Rove Face
---C
6" Max.
Alcove Clearances *
The MP35/50 pellet stove may be installed in an
alcove with the following minimum clearances:
Alcove height: 72"
Side Wall Clearance: 12"
Back Wall Clearance: 1"
The stove cannot be recessed into the alcove more
than 6" from the face of the stove to the plane of
the opening of the alcove.
Rear Wall orAlcove
Floor Protection
If placing units on acombustible surface, the
following requirements must be met:
Residential Installation: No floor protection
required when installed on a solid level surface (no
carpe0.
Mobile Home Installations: The floor protection
must cover the area beneath the stove and extend
one inch beyond the base on all sides.
* IF INSTALLED TO THE. MINIMUM SIDE
AND REAR CLEARANCES IN AN ALCOVE,
REMOVAL OF THE APPLIANCE MAY BE
NECESSARY FOR SERVICING.
Page 13
T
Alcove
36" Max.
1

INSTALLATION
yentin_ Requirements
There are several options for the installation and
venting of your pellet stove. Refer to clearances
before ins_ing your stove.
Connect onlyone flue per appliance. When oassing
_arough walls or .ce_!in_sl The manufacturer.
recommends that ctearances are maintained in
accordance with NFPA 21.1. Do not dowusize your
connecting pipe or chimney.
Your NaturalFire pellet stove must be connected to
a 4" oioe The preferred type of pipe is a listed
cbimn'e_ which co"nforms to- UL standard 641 or a
single wall pipe, 26 gauge minimum. Single wall
connector pipe is limited to use within the room.of
installation; wall or ceiling penetrati.'on must be ..vg.m
a listed vent pipe and a wall thimble or ceiling
penetration plate• Follow the pipe manutacturers
mstallatinn instructions and clearances. ALl p!pe
joints must be sealed wi_ the compound supphe-d
with the pipe or a RTV silicone with arating of at
least 570°F.
You may connect the single wall or pellet vent to
the top of the stove using three screws to secure it to
the collar. Use a RTV silicone with a rating of at
least'570°F, or interam to provide a complete seal.
Note: Single wall pipe can be used as aliner in a
class A, or masonry chimney.
Connection To A Masonry Chimney.
Be sure to verify the construction of a masonry
chimney, as many have combustible framing.
Follow the pipe manutacturer clearances.
An oversized chimney or high altitude may re.suit in
less than optimum performance. Inst911.atiom " mto a
large, masonry cl_lmney may regutre a}mer to
improve performance. The use of single w_,. n.ex or
rigtd (26 gauge galvanized or stainless steeu pipe as
aliner is approved.
Standard (Recommended)
The most desirable installation is Pellet Vent pipe
connected to the top of the stove and run up throu_,h
the ceiling, then terminating above the roof line. pe
sure to follow all clearances listed by the pipe
manufacturer.
Connection To An Existing Class A
Chimney
An adaptor can be used to make_e connection from
4" Pellet Vent pipe to existing UL cmmuey system.
Verify with th_ pipe manufacturer that. your pipe
brands will interconnect. Installauons rote a large
•* . •e
UL chimney system may reqmre a liner to unprov
-- -- _r• •d
performance. The use of single wall flex.or ngl
_26 gauge galvanized or stainless steel) pipe as a
liner through a UL class "A" chimney is approved.
Page 14

INSTALLATION .-
Direct Vent
Although a direct vent flue is an approved
installation, the manufacturer recommends the
outside flue should be installed with a cleanout "T",
and Pellet Vent chimney pipe run up through the
cave. This will eliminate the possibility of siding
discoloration and/or to enhance performance in bad
draw situations. Terminate the pipe using the
standard clearance. Exception: If using a UL listed
Pellet Vent pipe you may use the Pellet Vent
manufacturer's cleara/lces.
IF BURNING CORN, DIRECT VENT IS NOT AN
APPROVED INSTALLATION.
IMPORTANT!! Never turn the Draft Fan Selector
to the "OFF" position on any direct vent
installations. Keep the Combustion Fan Switch on
the Primary Control Board in the "Low" or High"
position. In the event of a toss of power in a rear
vent direct termination application, natural draft is
not present and you may receive smoke back in to
the dwelling that will dissipate rapidly.
To Install
The MP35/50 can be converted to a direct vent by
transferring the top flue outlet to the rear vent
position. Replace the top flue outlet by using the
rear cover plate, removed from the back of the
stove. Follow the directions listed below:
1. Lift off the top louvered trim (A) to access the
top flue outlet. Remove mounting nuts and
starting collar.
2. Remove right side heat shield by removing
screws on rear flange to expose access opening.
3. Remove the rear flue cover plate located on the
back of the stove.
4. Install the gasket (B) and starting collar (C)
making sure the gasket is intact for a tight .seal.
Replace nuts and tighten.
5. Place the rear flue cover plate over the top
opening. Make sure the gasket is in place and
there is a complete seal. Replace nuts and
tighten.
6. Attach section of pellet vent pipe (D). Seal this
connection with high temperature silicone
sealant. Secure the section of pipe with two
sheet metal screws into the starting collar. One
up from the bottom at 6:00 position and one
from the side through the access opening at the
9:00 position. The horizontal run may not
exceed 36 inches..
When rear breaching, a trim kit is available through
your dealer, part number TRK35. It consists of the
1) New louvered top trim, and 2) Two flue seal
gaskets (the additional gasket is provided in case of
accidental damage during installation).
A) Top Louvered Trim Panel
B) Gasket Material
C) 4" Starting Collar
D) 4" pellet pipe, 24" section
E) 4" Wall Thimble
F) 4" Rain Cap
•
Page 15 '

INSTALLATION
Mobile Home Installation Requirements
Installation of the MP35/50 into manufactured
housing must follow the instructions for residential
installation, with the following supplemental
requirements per OAR 814-23-900 through
814-23-909:
.No single wall pipe may be used as a connector
or chimney. Pellet Vent pipe must be used from
stove top to termination.
2. Maximum two offsets permitted.
,The chimney must provide for a section joint so
that any parts extending above 13' 6" from
ground level can be removed for transportation
of the mobile structure.
oThe stove must be grounded to the mobile home
wailer frame with a No. 8(minimum) solid
conductor.
5. The combustion air must communicate to the
outside air.
6. Floor protection must cover the area beneath the
stove and extend one inch beyond the base on all
sides.
7. Structural members such as roof trusses or floor
joists cannot be cut or modified while making
the installation.
Outside Air Provision
Although this section applies to a mobile home
installation, it may also be required by local codes in
standard residential installations. Use the
manufacturers optional outside air kit (part #85-35)
or equivalent.
1, Set the stove in its irmtalled position and select
the floor or outside wail location for the outside
air penetration. The air ducting must connect
with the bottom of the motor cabinet of your
stove, using rigid or flexible 3" duct.
2. Cut an opening for the outside air kit (Part
#85-35).
3. Install the outside air kit.
Outside Combustion -_-_"
Air Inlet
Page 16

INSTALLATION
Optional Installation Applications
Direct Vent Termination
<
m
Direct Vent Using a Cleanout "T"
Page 17