MP80
INSTALLATION AND OPERATION MANUAL

MP80 SOLID FUEL
FURNACE FOR USE AS
ANADD-ON TO OIL, GAS OR
ELECTRIC FURNACEOR AS AN INDEPENDENTFORCED AIR WITH BLOWER

READ THOROUGHLY AND COMPLY WITH ALL LOCAL CODES AND REGULATIONSVALLEY COMFORT SYSTEMS INC.
1290 COMMERCIAL WAY
PENTICTON, B.C. V2A 3H5(250) 493-7444
www.blazeking.com
Email: sales@blazeking.com
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Pour la version française de nos manuels S.V.P. vous référez à notre site web : www.blazeking.com

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INDEXWARRANTY

4&5

SPECIFICATIONS

6SAFETY PRECAUTIONS

7

OPERATIONS

8LIGHTING INSTRUCTIONS

8WOOD TYPES

9

RELOADING

9CREOSOTE

10

MAINTENANCE

11

GASKET (DOOR)

11

INSTALLATION INSTRUCTIONS

12PARTS INCLUDED

12

OPTIONAL EQUIPTMENT

12INSTALLATION OPTIONS

12

TYPICAL INSTALLATION DIAGRAMS

13

CLEARANCES

14

ALTERNATE FURNACE LOCATIONS

14PRESSURE LOSS15COMBUSTION AIR

15

INTERCONNECT DUCT RETAINERS

15

FLUE LOCATION & CONNECTIONS

16

CHIMNEY HEIGHT

17

THERMOSTATS

17

FAN LIMITS

18

DOOR LATCHES18

OIL FURNACE ADD ON

19

GAS FURNACE ADD ON

19

WIRING DIAGRAMS

20,21,ELECTRIC FURNACE ADD ON

21

VB1000 BLOWER

22WARNOCK HERSEY LABEL

23

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VALLEY COMFORT SYSTEMS INC.
LIMITED WARRANTY - MP80
WARNING: TO VALIDATE THIS WARRANTY YOU MUST COMPLETE AND RETURN THE WARRANTYCARD WITHIN 20 DAYS OF THE DATE OF PURCHASE.
WHAT THE WARRANTY COVERS:
This warranty contains different terms that cover different parts of the furnace. VALLEY COMFORT SYSTEMS INC warrants the STEEL COMPONENTS including the COMBUSTION CHAMBER and CAST LINERS of the VALLEY COMFORT furnace, which is delivered with this warranty, against defects in material or workmanship to you, the original retailpurchaser (hereafter referred to as purchaser), for a period of up to five (5) years following the date of original retail purchase, subject to the provisions of RESPONSIBILITIES OF THE COMPANY below. VALLEY COMFORT SYSTEMS
INC warrants the FAN LIMIT CONTROLS, THERMOSTAT, DAMPER MOTOR, DOOR GASKETS, ELECTRICAL RELAYS (if applicable) and the BLOWER MOTOR (if applicable) of the VALLEY COMFORT furnace, which is delivered
with this warranty, against defects in material or workmanship, to the purchaser, for a period of one (1) year following thedate of original retail purchase, subject to the provisions of RESPONSIBILITIES OF THE COMPANY below. No person is authorized to modify this warranty or to make any additional warranties on behalf of the manufacturer, VALLEYCOMFORT SYSTEMS INC.

WHAT THE WARRANTY DOES NOT COVER:
Unless otherwise provided by law or covered by this warranty, VALLEY COMFORT SYSTEMS INC is not responsible forremoval, transportation or re-installation of any product repaired or replaced pursuant to this warranty. VALLEY COMFORT SYSTEMS INC shall in no event be liable for special, incidental, consequential, indirect or other similar damages
arising from the breach of the warranty, even if VALLEY COMFORT SYSTEMS INC has been advised of the possibilityof such damages. Some provinces / states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. VALLEY COMFORT SYSTEMS INC limits all implied
warranties, if any, including the warranties of merchantability or fitness for particular purpose, to one (1) year from thedate of original retail purchase. Some provinces / states do not allow limitations on how long implied warranty lasts, so
the above limitation may not apply to you. Actions for breach of this warranty must be brought within one (1) year of the
expiration of this warranty.
This appliance, when installed, becomes part of a system that includes, the fresh air supply, flue and chimney. VALLEYCOMFORT SYSTEMS INC. does not warranty this product for performance under operating conditions other than whatis specified in the manual. Problems caused by improper air supply, negative pressure or chimney flue system performance, are not covered by this warranty.

HOW YOU CAN GET SERVICE:
If this product requires repair or replacement due to defects in material or workmanship covered by this warranty, contact
your VALLEY COMFORT dealer and explain the defect. If the dealer does not repair or replace the product to your satisfaction, contact the Service Department of VALLEY COMFORT SYSTEMS INC at 1-250-493-7444, e-mail:sales@blazeking.com or write to 1290 Commercial Way, Penticton, BC, V2A 3H5. Please explain the defect and state
the model, serial number, date of retail purchase, and the name and address of your VALLEY COMFORT dealer. VALLEY COMFORT SYSTEMS INC may request that the defective part, parts, or the entire furnace, be shipped to VALLEYCOMFORT SYSTEMS INC at the purchaser’s expense.

RESPONSIBILITIES OF THE COMPANY:
IF the purchaser has complied with all of the terms and conditions of this warranty and IF the purchaser has notified
VALLEY COMFORT SYSTEMS INC of a defect prior to the expiration of the respective warranty period and after shipment to VALLEY COMFORT SYSTEMS INC., the following procedure shall be implemented. VALLEY COMFORT SYSTEMS INC. will upon receiving the product determine if there is a defect, and if the defect falls within the scope of thiswarranty. If it is determined by VALLEY COMFORT SYSTEMS INC. to be covered by this warranty then, VALLEYCOMFORT SYSTEMS INC. will either repair or replace the product, AT ITS ELECTION, or MAY ELECT to refund a
portion of the purchase price, based on the formula below. A refund will only be given to the purchaser in the event that
VALLEY COMFORTCONTINUED ....

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VALLEY COMFORT SYSTEMS INC
LIMITED WARRANTY - MP80
SYSTEMS INC. cannot provide a repair or replacement within a reasonable time, and the purchaser is willing to accept
such a refund. If VALLEY COMFORT SYSTEMS INC. elects to repair or replace the product based on the formula below, VALLEY COMFORT SYSTEMS INC. will ship the product prepaid at their expense to a VALLEY COMFORT
dealer nearest the purchaser. If it is determined by VALLEY COMFORT SYSTEMS INC. that there is no defect, or thedefect resulted from causes not within the scope of this warranty, then the purchaser must bear the cost of storing andof returning the product to the purchaser.
During the 2nd year ................... purchaser pays 20%
During the 3rd year .................... purchaser pays 40%
During the 4th year .................... purchaser pays 60%
During the 5th year .................... purchaser pays 80%

MISUSE OF FURNACE NULLIFIES WARRANTY:
The above warranty is conditional upon the proper installation and use of the furnace according to the manufacturer’s
directions embodied in the Owner’s Installation and Operation Instructions published by VALLEY COMFORT SYSTEMS INC and in compliance with the local building or fire codes in the area where it is installed. The Local Building
Inspector or Fire Department should inspect the furnace prior to beginning use. A copy of the Owner’s Installation andOperation Instructions is provided with each unit, or can be obtained by writing to VALLEY COMFORT SYSTEMS INC
at the address shown below. READ THE OWNER’S INSTALLATION AND OPERATION INSTRUCTIONS BEFOREINSTALLING OR USING THE FURNACE. SAVE THESE INSTRUCTIONS FOR FURTHER MAINTENANCE AND
SAFETY PROCEDURES. Alteration of, abuse of, damage to, lack of maintenance of, faulty repair, OR misuse of thefurnace, VOIDS this warranty. Use of fuel other than natural untreated wood (such as artificial logs, wood exposed tosalt water, or coal that may burn at excessively high temperatures or may release fumes that can explode) will VOID
this warranty. Burning the furnace with the loading door open (other than during the brief start-up period) will also VOID
this warranty.

OTHER LEGAL RIGHTS OF THE PURCHASER:
This warranty gives you specific legal rights, and you may have other rights that vary from province to province. All
parts of this warranty are to be interpreted in accordance with the laws of British Columbia, Canada. If you do notagree to the purchase of the furnace on the terms and conditions set out in this warranty, then you must return the
furnace to the dealer prior to use or installation, and the purchase price will be refunded.

THIS WARRANTY ONLY COVERS UNITS INSTALLED IN CANADA OR USA.
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||PLEASE KEEP YOUR RECEIPT, AS PROOF OF PURCHASE.
ALL WARRANTY CLAIMS SHOULD BE MADE THROUGH THE DEALER YOU
ORIGINALLY PURCHASED YOUR APPLIANCE FROM:WARNINGTO VALIDATE THIS WARRANTY, YOU MUST COMPLETE AND RETURN THE WARRANTYCARD WITH 20 DAYS OF THE DATE OF PURCHASEThis product is proudly manufactured in Canada by:

VALLEY COMFORT SYSTEMS INC.
1290 COMMERCIAL WAY, PENTICTION, B.C., V2A 3H5(250) 493-7444
E-mail: sales@blazeking.com

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SPECIFICATIONS

Model

MP80

Rating80,000 Btu. Nominal

HeightWidth
Length35
21
37

Flue collar
6" ID
Flue pipe center to bottom 26 1/2"
Recommended flue pressure .03" water column (draft)
Hot air plenum opening

30 5/8" L x 18" W

Fire door opening

12" x 13"Firebox length
Width
HeightCapacity

26"
14"
19"
4 cu. ft.

Fuel length24"

Firebox design features

1) distributed draft system with preheatedprimary air, via cast liner ports.
2) Stainless steel baffle system to retain
high combustion efficiency

Construction

14 Ga. Firebox
Cast iron liners
12 Ga. heat exchanger
20 Ga. cabinet
Stainless steel baffle

Weight

325 lbs.

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SAFETY PRECAUTIONS- Comply with all local codes and regulations.
- Never operate a furnace that has been improperly installed.
- DO NOT USE CHEMICALS OR FLUIDS TO START OR FRESHEN A FIRE. Keep all flammable fluids well away from the furnace.
- DO NOT BURN GARBAGE, GASOLINE, NAPHTHA, OR ENGINE OIL, OR RAGSSOAKED IN THESE FLUIDS.
- Combustible material including firewood must be stored well away from the furnace, outside of the
distances specified for "clearance to combustibles".
- Never operate the furnace unless you are sure the smoke pipe and chimney are in safe condition.
Flue gasses may contain carbon monoxide, which is poisonous.
- Keep smoke pipe and chimney clean to prevent a chimney fire. In the event of a chimney fire turndown all thermostats and close off combustion air. Call a fire department if necessary. Have aclearly understood plan to handle a chimney fire.

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Congratulations on your choice of a wood furnace from Valley Comfort. We thank you for the confidence
you have placed in us.
A word about Valley Comfort -- In 1953 when most folks were excited about getting rid of their woodburning appliances, a determined entrepreneur, Pete Stoopnikoff, was convinced that he could make a better wood heater. After many years of packing "too much wood", he was determined to produce a more efficient Canadian heater. He succeeded! That's over 40 years ago and since then Valley Comfort has researched, designed, produced and marketed an expanding line of fine products. In the late 1970's safety
standards were introduced to the industry and our products were some of the first to be approved. Today, allof our heaters and furnaces are tested and approved to the national standards. We have built our reputation
on quality and are committed to that end when making all of our products.
This instruction booklet provides you with important instructions assuring maximum usage and service lifeof your furnace. Please read this booklet thoroughly and save it for future reference. Carefully follow instructions for installation.

OPERATING INSTRUCTIONSLIGHTING THE FIRE
NEVER START A FIRE UNLESS THE FURNACE IS CORRECTLY INSTALLED.
CHECK THE INSTALLATION INSTRUCTIONS CAREFULLY
In a new furnace, spread 1" of sand or ashes in the bottom of the firebox to protect against high heat and toprevent warping
Your MP80 firebox is lined with quality cast liners. Stresses inherent in the cast process must be neutralized before you build extremely hot fires. The first fire should be small and should burn no longer than
30 minutes, gradually increasing for the next six lightings.
Turn up the thermostat to open the draft
NEVER USE FLAMMABLE FLUIDS TO START THE FIRE
On top of crumpled paper place split dry kindling and then small wood. When a small fire is established
add larger pieces of wood
Load the wood only to the bottom of the door.
The first time you light your furnace, high temperature paints will give off an odor. Open a window to ensure adequate ventilation.
The damper will close when either the plenum temperature reaches the limit level or the room temperaturereaches the thermostat setting.
The circulation blower should cycle off and on automatically, dependent on plenum temperature.

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WHAT KIND OF WOOD
There is an old idea that you should use some green wood to insure long burn times. THIS IS WRONG! Always remember, the dryer the wood the better. It takes a great deal of energy to evaporate the moisture contained in green wood and that energy will not be heating your house. Green or wet wood also increases creosote formation.
In most cases the harder the wood the more heat it produces,. In all cases the dryer the wood the more heat it
produces. We recommend at least 12 months drying time for split piled wood, protected from rain.
Your wood burning furnace is not designed to burn coal and doing so is unsafe. Burning coal voids the warranty. Never burn salt water drift wood. It is very corrosive and will damage the firebox. Burning salty wood
also voids the warranty.
This controlled combustion firebox has been designed for high efficiency and long burn times. The proper
time to add more wood is when the last charge has been reduced to a glowing charcoal bed stage. There will
be very little smoke at this stage in the burn cycle.
WARNING: BURNING WET UNSEASONED WOOD CAN CAUSE EXCESSIVE CREOSOTE ACCUMULATION. WHEN CREOSOTE IS IGNITED IT CAN CAUSE A CHIMNEY FIRE WHICH
MAY RESULT IN A SERIOUS HOUSE FIRE

OPERATIONS
Draft is created by the heated air rising in the chimney system. This draft will pull fresh combustion air
into the firebox. Recommended draft is .03 in. w.c. Too little draft results in a sluggish fire and smokebacking up into the house when the furnace door is opened. Too much draft (over .06 in. w.c.) is unsafe
and wastes fuel. (Use a Barometric damper when necessary)
The damper opening has been set at the factory and should not be adjusted.
Ashes should be cleaned out when they reach a depth of 4" in the firebox. Leave approximately 1" of ashes
in the bottom of the firebox. Dispose of ashes in an airtight, metal container and store it outside awayfrom combustibles.
Adjust the bleed air screw on the damper door to just maintain combustion air during times when thedamper door is closed .
OPEN THE FIRING DOOR ONLY TO RELOAD FUEL.
Your appliance must be vented by a chimney system suitable for solid fuel fired appliances and should bechecked periodically to insure its safe condition.
During a power failure, use extreme caution to not over fire. Leave the damper closed. Remove the blower
cabinet door and air filter. Open all registers to allow maximum air flow in the duct system. Although
there is considerable heat available even during a power failure, this furnace is not approved for gravity
operations. Without the blower running, high temperature in the system builds up quickly and over firing will result in permanent damage to the firebox. Maintain a small fire only. Over firing voids all
product warranties.
If your furnace is operating as an add-on combination unit remember both units will not fully fire at thesame time. If wood is to be your main source, set the wood thermostat at your desired room temperatureand set the backup thermostat approximately 5 degrees lower.

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CREOSOTE
In any wood burning appliance, creosote can be a problem. The best way to handle it is to prevent or minimize it by proper firing methods. If creosote does occur you should understand its nature and have a plan tohandle it. Always assure safety by having a clearly understood plan of how to handle a chimney fire, if itever occurs.
Creosote is a black, ill smelling liquid which results from distillation of wood gases during the combustion
process. It solidifies depending on temperature and is highly combustible in either state . The amount of
creosote depends on several factors:
1) Moisture content of the fuel2) Stack or flue temperature3) Amount of draft
4) Appliance Efficiency
When stack temperatures drop below 120oC (250oF), creosote will condense out of the products of combustion or smoke. Once a flue pipe becomes heavily coated with creosote, the only safe way to remove it iswith a proper chimney cleaner or brush. A combination of wet fuel and poor operating procedure may necessitate weekly cleaning to remove creosote buildup.
Remember - the hotter the fire the less creosote. A large smoldering fire causes more creosote than a small,high heat fire. We recommend that each day, preferably in the morning, a small intense fire be maintained.
This daily practice should burn out the small deposits of creosote before they build to a dangerous level.
Morning and evening the draft should be opened for at least 20 minutes by turning the thermostat up.
NEVER "burn out" large deposits of more than one day’s accumulation.
In conclusion, creosote can best be controlled as follows: Burn dry split wood.
Mixing small and large pieces of wood.
Using smaller split wood during warmer weather.

Keeping stack temperature up by using double wall pipe on flue runs and protecting outsidechimney installations in a chase.
Minimizing elbow use and keeping flue runs as short as possible ensuring tight connections.

Checking daily for creosote until experience shows how often cleaning is required. Remember aclean chimney is a safe chimney.

Having a clearly understood plan should a chimney fire occur.
WARNING: FAILURE TO INSPECT AND CLEAN YOUR CHIMNEY SYSTEM REGULARLY CANRESULT IN A SERIOUS FIRE WHICH MAY DAMAGE YOUR CHIMNEY OR CAUSE A HOUSE
FIRE

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MAINTENANCE
Maintain fire door gaskets to ensure a tight seal. Use 7/8" replacement gasket. Glue is not necessary as
high density gasket will fit tight and stay secure.
WARNING: DO NOT OPERATE THIS WOOD FURNACE IF THE DOOR GASKET IS MISSING
OR DAMAGED. DANGEROUS OVERFIRING CAN OCCUR WHICH CAN DAMAGE THE APPLIANCE OR IGNITE CREOSOTE IN THE CHIMNEY, POSSIBLY CAUSING A HOUSE FIRE.
IF ANY PART OF THE WOODSTOVE OR FLUE SYSTEM IS GLOWING THE FURNACE IS BEING OVERFIRED.

OPERATE THE ALTERNATE ELECTRIC, GAS OR OIL FURNACE PERIODICALLY TO ENSURE THAT IT WILL OPERATE SATISFACTORILY WHEN NEEDED.
INSPECT VENT PIPES, VENT PIPE JOINTS AND VENT PIPE SEALS REGULARLY TO ENSURE
THAT SMOKE AND FLUE GASES ARE NOT DRAWN INTO OR CIRCULATED BY, THE AIR
CIRCULATION SYSTEMYour appliance has been manufactured in the Valley Comfort tradition of high quality. To ensure yearsof trouble free operation, have your furnace serviced regularly by your Valley Comfort dealer.
After each heating season thoroughly clean the chimney and firebox so your system is ready for next
fall. Inspect all parts for signs of abnormal wear or problems.

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INSTALLATION INSTRUCTIONSGENERAL
Please take time to read these instructions thoroughly. You have invested your money in a quality product.
Too much haste now, could result in a faulty installation, and cause serious problems. In addition to thesegeneral installation instructions, which apply to all installations, you must follow the specific instructions
which pertain to your particular installation i.e.: add-on to electric, gas, oil or independent installations.

FREIGHT DAMAGE
This product was carefully inspected before it left Valley Comfort, inspect the unit thoroughly and reportany damage to the carrier and then immediately file a freight damage claim. Your local Valley Comfort
dealer will assist if required.

PARTS INCLUDED WITH MP80 (parts inside firebox for shipping)
Furnace
Fan limit controls, bracket and electrical junction box
Honeywell
L4064R 1027 set at 150° or equivalent
Honeywell
L4064R 1043 set at 220° or equivalent
Honeywell
L4064N 1058/U set at 250° or equivalent (Manual Reset)
Thermostat (Honeywell T822d or equivalent)
Poker
Ash shovel
Instruction bookInsulation hold back strips

OPTIONAL EQUIPMENT

900 cfm. to 1200 cfm.. Variable Blower and cabinet for independent use.
CF6 kit for use in wood counter flow installations

INSTALLATION OPTIONSThe MP80 may be installed as follows: (Typical Mechanical Drawings on page 13 fig. #1.)
1) An add-on to any of the following furnaces:a) An electric forced air furnace rated at 10 KW to 25 KW with a minimum size fan of
900 cfm. Diagrams 8 & 8A on page 21(electrical drawing)b) A forced air gas furnace with a maximum output
of 120,000 Btu. and a minimum size fan of 900 cfm.
Diagram 6 on pg 20 (electrical drawing)c) An oil furnace having an oil input as shown on the nameplate of not more than 1.2
usgph. and a fan capacity of not less than 900 cfm. Diagram 6 on page 20 (electricaldrawing)2) As an independent forced air wood furnace equipped with a blower of not less than 900 cfm. capacity. Diagram 7 on page 20 (electrical drawing)

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Typical installation illustration Fig 1.

HOT AIR TO HOUSE

ALTERNATE

HOT AIR TO HOUSE

ALTERNATE
HOT AIR

HOT AIR
PLENUM

PLENUM

GAS, OIL

GAS, OILELECTRICELECTIRCUP FLOWUP FLOW

FURNACE

FURNACE

EXISTING

MP80

MP80

HOT AIR TO HOUSE

HOT AIR SUPPLYPLENUM

RETURN

RETURNAIR

AIR

PLENUM

PLENUM

COUNTER/

COUNTER/FLOW GASFLOW GASELECTRICELECTRICOR OILOR OIL

MP80

MP80

WOOD COUNTERFLOW
INSTALLATION REQUIRES
CF6 KIT OPTIONNOTETYPICAL ADD ON SYSTEMLAYOUT

IN THIS CONFIGURATIONSPECIAL CLEARANCES APPLYSEE CF6KIT INSTRUCTIONS.
DO NOT INSTALL IN THISCONFIGURATION WITHOUTUSING THE CF6KIT.
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CAUTIONS
All installations must comply with local building safety codes.
Installation shall be by a licensed, qualified mechanical installer experienced in heating equipment
installations.
THE WOOD SECTION MUST BE VENTED INTO A CHIMNEY APPROVED FOR SOLIDFUEL USE BE IN GOOD CONDITION. MOST GAS FURNACES ARE VENTED INTO "B"
VENT PIPE. THIS IS UNACCEPTABLE FOR SOLID FUEL APPLIANCES. THE MP80
MUST NOT BE VENTED INTO A CHIMNEY WHICH ALSO SERVES AS A GAS APPLIANCE VENT.
DO NOT CONNECT THE DUCT WORK SO REVERSE OR PARALLEL FLOW IS POSSIBLE.
DO NOT RELOCATE ANY OF THE CONTROLS ON THE ORIGINAL OR ALTERNATE FURNACE.
Ensure that all existing or alternate furnace systems are in good operating condition before installingthe add-on.
Valley comfort Systems Inc. supports the Wood Energy Technology Transfer Inc. This organization provides training and certification for personnel involved in installation andmaintenance of wood heating systems across Canada. For your safety and satisfaction
your system must be properly installed.

MINIMUM CLEARANCES TO COMBUSTIBLES (See label copy addendum)
Wood charging end
One side
Other side for servicing
Single wall flue to combustibles including electric wiring and electric furnace

48 inches
6 inches
18 inches
18 inches

Plenum and first 6 ft. of supply duct

2 inches

If the furnace sits on a combustible floor, a non combustible shield must be used underneath and extend 6 in. out from all sides and 18 in. out from the charging end. This floor protection is required toprevent sparks from falling onto the combustible floor,(see CSA B365-M87) it is not required to be aheat protective covering.
This furnace must be installed in compliance with all local codes and regulations.

LOCATION RE ALTERNATE FURNACE OR BLOWER
The MP80 can be located on either side of the alternate furnace as space permits, in a series downstream
configuration. Minimum size of the interconnect duct is 12 in. x 18 in. DO NOT USE INTERCONNECT
DUCT ELBOWS THAT HAVE AN INSIDE RADIUS OF LESS THAN 6" (150mm.).

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NOTE: After interconnect duct opening has been cut into the side of the MP80, insulation must be fastened back to the furnace cabinet all around the opening. Use the metal strips provided to hold the insulation tightly against the cabinet inside, to prevent the insulation from dislodging due to blower induced vibration.

PRESSURE LOSS
Before any changes are made to the existing furnace system you must establish the working parameters of thatsystem. You can then insure that the addition of the add-on will not degrade the operation of the original system and can confirm correct air flow will be maintained. Change all filters in the system to insure maximum
free air flow. Using an accurate manometer, check the static pressure at the end of a typical duct near the exit
to the house and then check the static pressure in the plenum above the existing furnace.
Pressure drop = Static pressure at furnace -(minus) static pressure at duct exit
Record the pressure drop of the original system.
Addition of the add-on furnace will add air flow resistance in the system. After installation is complete measure the pressure drop in the same run measured before add-on installation. If the air flow has diminished theblower speed should be adjusted to compensate. When using a belted blower the pulley size should bechanged or adjusted to speed up the blower. If the pulley size is adjusted measure the blower motor current toinsure that it is still within the nameplate rating. It may be necessary to replace the motor with a more powerful motor. If a direct drive blower is used change to a higher speed. Do not change the blower size.

COMBUSTION AIR
Insure adequate combustion air allowing for all other exhausting type appliances in the dwelling (range hoods,
dryers, fireplaces etc.…). Introduce outside air if required to the furnace and allow for circulation via two
openings. In confined area, provide at least 1 sq. inch minimum free area for each 1000 BTU installed capacity.

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LOCATION RE FLUE
The Chimney must be an approved chimney for use with solid fuel fired appliances, be in good repair
and be free from leaks and obstructions. If using a masonry chimney, it must meet the minimum standards of the building code of Canada. The wood flue must always enter the chimney below an oil flue.
You must comply with the local authority having jurisdiction and with CSA installation standard B365
-M87. DO NOT OPERATE THE MP80 WITH A DRAFT OF OVER .06 INCHES WATER COLUMN. HIGHER DRAFT LEVELS MAY CAUSE THE FIRE TO BURN OUT OF CONTROL AND
CREATE A FIRE HAZARD.
Flue pipe between the furnace and the chimney should be as short and direct as possible, rising a minimum of 1/4" per running foot. The chimney connector must be attached to either an approved masonry chimney or one of the listed factory built chimneys suitable for use with solid wood fuel. All
joints must be tight and fastened with sheet metal screws. Place the small (crimped) end of the pipe
into the furnace collar and into each preceding length of pipe to ensure that any creosote which mightform will run back down into the furnace see fig 10 below..
WARNING: Chimney connector is to be used only within the room, between the stove and ceiling/wall. Never use chimney connector to pass through a combustible ceiling or wall. Always
maintain the minimum clearances to combustibles as required by the building applicable codes.

TOWARDFLUE GASESSTOVERISING DIRECTION

FLUE PIPE
CONNECTIONS
120FIG9

Recommended draft is .03 in. water COLUMN. It is unsafe to operate the furnace with more than .06 in.
water column draft, use a barometric control, if necessary, to achieve this.
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CHIMNEY HEIGHT REQUIREMENTS
Regardless of whether you use a masonry chimney or a listed metal chimney it must be the required height
above the roof or other obstructions. The code requires the chimney to be at least 3 feet higher than thehighest point where is passed through the roof and at least 2 feet higher than the highest part of the roof or
structure that is within 10 feet of the chimney, measured horizontally. (see diagram below)

The height requirement is necessary in the interest of safety and does not necessarily assure proper flue
draft. Use a minimum total system height of 12 feet, measured from the stove flue collar to the top of thechimney, not including the chimney cap.

THERMOSTATSStand alone wood furnace installations use one thermostat for the wood furnace. Combination systems using your wood furnace in conjunction with an alternate furnace (gas/oil/electric) will use 2 thermostats, one
to control the wood furnace and one to control the alternate furnace. The two thermostats are interconnected
via the various limit controls, to prevent simultaneous operation of both furnaces when the hot air plenum
reaches 150°F. Thermostats should be mounted side by side on an inside wall out of direct sunlight or otherheat sources.

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FAN LIMIT INSTALLATION
Using the bracket provided, install the fan limit and junction box assembly onto the warm air plenum, above
and to the right of the firebox fuel door, as illustrated in Fig 2. All 120vac wiring must be routed on the outside of the cabinet surface. Installation of wiring must be by a qualified electrician. See specific add on type
instructions for wiring diagrams that apply. Wire between the junction box and the damper motor should berouted in the outside channel of the bracket, to the right of the firebox door with clips at each end as required. Clips must not compress leads tightly against the surface.

FIG 2
FAN & LIMIT &ELECTRICAL JUNCTION BOX
MOUNTED TO PLENUM
AS SHOWN USING 2 PLY
MOUNTING BRACKETTEMPLATE FOR DRILLING HOLES—CUTOUT LINES

Ø0.80 in (3x)3.50 in3.50 in

DOOR AND LATCH INSTALLATION
Install the firebox door on the frame hinges. Install the door latch catch on
to the frame mounting bracket, as shown below, using the two 1/4" x 3/4"
carriage bolts provided. Adjust the door latch catch for a snug fit of thedoor against the gasket. The door gasket will "seat" after a short time so
the initial adjustment should be snug. Advise the homeowner to check thefit of the door gasket from time to time to ensure a seal all around the firebox door. A loose fitting door will allow entry of excess air and result inhigher burn rates with less control.

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ADD-ON TO OIL FURNACEThe MP80 may be connected to an oil furnace having a rated input of up to 1.2 USGPH. Minimum
blower capacity must be at least 900 cfm.. A regular upflow oil furnace may be used and connected as
per fig. 1on pg. 13. The MP80 can be located on either side of the oil furnace. Minimum interconnect
duct size is 12" X 18" with minimum 6" inside radius elbows The wood furnace requires a chimney approved for solid fuel use. Maintain clearances to all combustibles. Refer to general instructions portionsof this manual also.
If changes are made to the installation of the oil furnace these shall comply with CSA Standard B139.
An interconnect limit switch system must be included in the control circuitry to prevent the simultaneous
operation of both furnaces when the hot air plenum reaches the preset level of 150°F. See Typical wiring
Diagram 6 on pg. 20.

ADD-ON TO GAS FURNACEThe MP80 may be connected to a gas furnace having a rated input up to 120,000 BTU. Minimum blower
capacity must be at least 900 cfm.. A counterflow gas furnace may be used with an interconnect duct as
indicated in Fig 1. page 13. A regular upflow gas furnace may also be used and connected as per Fig 1onpg. 20. The MP80 can be located on either side of the gas furnace. Minimum interconnect duct size is12" x 18" with minimum 6" inside radius elbows. The wood furnace requires a chimney approved forsolid fuel use. Maintain clearances to all combustibles. Refer to general instructions portions of this manual also.
THE OPERATION OF THE GAS FURNACE MUST BE VERIFIED, FOR ACCEPTABLE OPERATION BEFORE AND AFTER INSTALLATION OF THE ADD ON, BY A GAS FITTER WHO IS
RECOGNIZED BY THE REGULATORY AUTHORITY. DO NOT CONNECT TO ANY FURNACETHAT HAS NOT BEEN CERTIFIED INITIALLY AS COMPLYING WITH CGA STANDARD CAN1
-2.3 OR ITS PRECEDENTS. DO NOT CONNECT TO ANY FURNACE THAT IS NOT EQUIPPEDWITH AN AIR CIRCULATION BLOWER.
DO NOT, UNDER ANY CIRCUMSTANCES, CONNECT THE MP80 TO A CHIMNEY WHICH
ALSO VENTS A GAS FURNACE OR OTHER GAS APPLIANCE.

ADD-ON TO ELECTRIC FURNACEThe MP80 may be added to an electric furnace with heating capacity between 10KW and 25 KW. Minimum blower capacity must be at least 900 cfm. Electric furnaces approved for installation in any position
can be inverted and used in a down flow position using an adapter duct between the furnace and the addon as indicated in fig. 1 pg. 13. The electric furnace can be located on either side of the MP80 but clearances to combustibles must be maintained. Refer to general and pressure loss instruction portions of thismanual. (pg. 15)
If changes are made to the installation of the electric furnace they must comply with CSA Standard
C22.1.
An interconnect limit switch system must be included in the control circuitry that prevents the simultaneous operation of both furnaces when the hot air plenum reaches the preset level of 150°F. Typical wiring
diagram follows below re: Diagram 8A (with W1,R,C and G connections.) and 6 for basic units.
An interconnect limit switch system must be included in the control circuitry to prevent the simultaneous operation of both furnaces when the hot air plenum reaches the preset level of 150°F.
Typical wiring diagram follows, see Diagram 6 on pg. 20
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DIAGRAM 6

TYPICAL WIRING FOR WOOD / GAS, WOOD / OIL OR WOOD/
ELECTRIC COMBINATIONS

L4064R1027
INTERLOCK LIMIT
150 DEG F

L4064R1043
LIMIT
220 DEG F

L4064N1058
LIMIT MANUAL RESET /FAN
25O F (121 C)

BreakJumperJunction
Box

ALTERNATE THERMOSTATWOOD THERMOSTATW1
24V IN(24V out tofutnace control)

DAMPERMOTOR

Fan Control to
Alternate Furnace (High Voltage)

C (Common)

Optional
CF-6KITINDEPENDENT WOOD FURNACE
When installed with a blower cabinet mounted on either side the MP80 becomes an INDEPENDENT
wood only furnace. The blower must have a minimum 900 cfm. capacity. In this configuration theinterlock function of the transfer relay is not used. See Electrical Diagram 7 on page 21.

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DIAGRAM 8A

WIRING CONNECTIONS WHEN USING ELECTRICAL FURNACE WITH
W1,R,C&G CONNECTIONS.
L4064R1027
INTERLOCK LIMIT
150 DEG F

L4064R1043
LIMIT
220 DEG F

L4064N1058
LIMIT MANUAL RESET /FAN
25O F (121 C)

BreakJumperJunction
Box

ALTERNATE THERMOSTATDAMPERMOTOR

WOOD THERMOSTATW1

R (24V IN)

C (Common)

G

Optional
CF-6KIT
DIAGRAM 7
L4064R1027
INTERLOCK LIMIT
150 DEG F

WIRING AS AN INDEPENDENT FORCED AIR WOOD FURNACE EQUIPPEDWITH A VB1000 BLOWER
L4064R1043
LIMIT
220 DEG F

L4064N1058
LIMIT MANUAL RESET /FAN
25O F (121 C)

Junction
Box

When installing in astand-alone configuration with a VB1000
blower. Only 2 out of
the three limit switches
are used. The middle
limit is the Operating
Limit and the right limit
with the red re-set
switch is the Safety
Limit. The left limit is
only for use with an alternate furnace.

120V IN

TRANSFORMER
24V OUT

Optional
CF-6KITN
120VAC IN
WOOD THERMOSTAT

N
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21

24 Volt Transformer comes with the VB1000 Blower

DAMPER
MOTOR

Date printed:4/7/2011

VB1000 Valley Comfort Blower Specifications

This opening 15/16 "17
attaches tothe plenum

22"

3/4"

1"
1"

19 7/16 "This opening
attaches tothe furnace

1 29/32"
13 23/32"

11 13/16"

13 1/4 "6 3/16 "

/1
15
19

6"

24"








1/3 HP 110V Motor
Adjustable from 900cfm to 1200 cfm
20Ga Steel Cabinet Construction
High Quality Baked Enamel Finish
Color matched to Valley Comfort Wood Furnaces
Complete with 24" X 20" Air Filter

Please check the dimensions on this drawing against the unit you are installing as there may besome slight variations in the dimensions due to manufacturing tolerances and or changes.
Installation instructions begin on page 12 of this manual.

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ALTERNATE THERMOSTATWOOD THERMOSTAT

W1

MP80.PUB Version 1.05

R (24V IN)

C (Common)

24

DAMPER
MOTOR

G

Date printed:4/7/2011