United States Stove Furnace HOTBLAST 1950 User Manual

INSTALLATION AND OPERATING INSTRUCTIONS

FOR THE HOTBLAST 1950 EPA WOOD BURNING FURNACE

Verified and tested following CSA

B366.1 M91, UL 391-95, 99 by :

Intertek Testing Services

Distributed by:

UNITED STATES STOVE COMPANY

227, INDUSTRIAL PARK ROAD

P.O. BOX 151

SOUTH PITTSBURG TN 37380

Tel: (423) 837-2100 Fax: (423) 837-2109

INTRODUCTION

Take note that this furnace operates like an EPA wood burning stove. This applies to the lighting, the embers and

the minimum combustion air intake which depends on the type and the grade of the combustible.

This model line is certified as meeting the emissions limits in 40 C.F.R. part 60, section 60.532 (B) per EPA

methods 28 and 5G-3, February 1988.

Average emissions rate: 6.56 g/hr

Average heating efficiency: 71.43%

To optimize the efficiency of your furnace, here are few advices you should follow when installing or operating

your Hotblast 1950 furnace.

Respect the local codes (when in doubt, consult your local dealer).

Make sure your furnace is installed according to the instructions on the certification plate.

All controls adjustments must be performed by a qualified technician. The controls settings and the blower speed

must conform to the recommendations of the National Warm Air Heating and Air Conditioning Association and

respect the recommended static pressure ranges in the warm air bonnet of the furnace (see General Technical

Data, static pressure).

1. CHIMNEY AND DRAFT

This furnace must be connected to a chimney certified for wood burning heating appliances; a 7 inch connector is

highly recommended for your Hotblast 1950.

If draft exceed –0.06 in. W.C a barometric damper should be installed on the smoke pipe.

Never install a manual damper.

The barometric control must be adjusted so that the maximum draft measured at the furnace outlet does not

exceed -0.06 in. w.c. Please note that a draft exceeding -0.06 in. w.c. could produce an uncontrollable fire. On the

other hand, the minimum draft required is -0.04 in. w.c. in the evacuation pipe.

2. SAFETY RULES

2.1

GENERAL REQUIREMENTS

ꢀ Make sure the chimney outlet and the pipes are clean and in good condition.

ꢀ Do not use chemical products or flammable liquids to light the fire.

ꢀ Do not burn wood coated with paint, glue or chemical products.

ꢀ Do not burn wastes or flammable liquids such as gasoline, naphtha or motor oil.

ꢀ Do not install an automatic feeder on this furnace.

ꢀ Do not store wood in the vicinity of the furnace. Respect the required clearances between combustible materials

and the source of heat.

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W A R N I N G

-THE ASH DRAWER AND EXCHANGERS ACCESS PANEL GET VERY HOT.

-DO NOT MANIPULATE WITH BARE HANDS.

2.2

ODOUR FROM THE PAINT

It is normal that a smoke odour emanate from the unit when you first light it. It is recommended to burn it at high

rate and ventilate the building until the odour resorbs.

2.3

ASH DISPOSAL

Ashes must be placed in a metal container with a tight fitting lid. The container should be stored outdoors, well

away from combustible materials. If the ashes are meant to be buried in soil, you should wait until all cinders have

thoroughly cooled before burying.

2.4

CREOSOTE BUILD-UP AND REMOVAL

When wood is burned slowly, it produces tar and other organic vapours which, when combined with moisture,

form creosote. The creosote vapours condensate in a relatively cool chimney flue. As a result, creosote residues

accumulate in the flue lining.

N.B.: To minimize the frequency of the chimney cleaning, buy your firewood at least one year before using it. Store

it in a dry place in order to obtain the minimum moisture content and optimize its efficiency. Do not store wood or

combustible materials within the installation minimum clearances or the space required to reload the appliance and

remove the ashes.

When ignited, creosote produces an extremely hot fire inside the chimney.

To avoid chimney fires, it is important to do the turnover of wood. Inspect the chimney and venting system at

regular intervals to determine a cleaning cycle. A weekly cleaning might be required during mild temperature

periods but a monthly cleaning should be sufficient during colder periods. If a significant layer of creosote has

accumulated, it must be removed immediately to eliminate the risk of a chimney fire. Remember that a small

hot fire is preferable to a large smouldering one to prevent creosote build-up within the system. An emergency plan

is necessary in case of a chimney fire. It is recommended to clean the heat exchangers thoroughly at the end of the

season to prevent rust.

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2.5

SMOKE DETECTOR

We highly recommend the use of a smoke detector. It must be installed at least 15 feet (4,57 m) from the

appliance in order to prevent undue triggering of the detector when reloading.

2.6

DOOR GLASS

To maintain a clean and safe installation, do not build your fire too close to the glass or allow the fire logs to lean

on the glass.

Do not operate your furnace at the minimum rate for prolonged periods and keep the air inlet opened long enough

during the fire start-up to prevent the fire from going out; failure to do so will contribute to the sooting up of the door

glass, exchangers and chimney.

An intense fire will help keeping the glass clean. However, in the event that your glass gets stained, which should

not occur, you will have to clean it using a wet cloth and oven cleaner. The glass may be cleaned ONLY when the

unit has cooled down. Do not use abrasive cleanser. Wood stove glass cleaners are available on the market and

their efficiency makes no doubt.

WARNING: Avoid knocking or scratching the glass which could be damaged.

2.6.1 GLASS SPECIFICATIONS

The glass is made of Pyroceram type of glass, 3/16” – (5 mm) thick.

Do not operate your furnace with a broken glass, as this could seriously damage your appliance.

You can purchase your replacement glass from your Hotblast dealer.

2.7

ASH DRAWER

Your appliance is equipped with an ash drawer to collect ashes produced by the combustion of wood. This

drawer must not be left open during combustion as this will cause over firing and serious damage to the furnace.

The drawer must be cleaned regularly.

It is important that the door and the ash drawer be kept closed while the appliance is in use.

Maintain all gaskets in good condition: in case of deterioration, contact your dealer for

replacement.

2.8

ASH GRATE

You must replace the ash grate if it is damaged and a replacement may be obtained from your dealer. The steel

plate on the ash grid is meant to optimize the heat inside the combustion chamber and should only be removed to

empty the ashes.

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3. APPLIANCE INSTALLATION

3.1

UNIT LOCATION

The furnace must be installed where outside air supply is sufficient for proper combustion. In airtight houses, it

might be necessary to install an outside air inlet (see details in section 3.4).

The furnace must be positioned so that the connector is as short as possible; minimize the use of 90^oelbows.

The owner must ensure a proper installation to allow a safe operation of the appliance.

3.2

CLEARANCES TO COMBUSTIBLE MATERIALS

N.B. This appliance must be installed according to the instructions on the unit’s certification plate.

MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS FOR HOTBLAST 1950 FURNACE

N.B. THE SIZE OF THE AIR RETURN CONDUITS SHOULD BE AT LEAST EQUAL TO THE

SIZE OF THE COLD AIR PLENUM OPENING.

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3.3

PIPE CONNECTOR AND DAMPER

Before proceeding to connection, remove all accessories such as

scraper, shovel and poker from the evacuation pipe of the furnace.

A 7” diameter chimney listed for use with wood burning heating appliances is highly recommended for the

Hotblast 1950. In this case, a reducer from 7” to 6” is required. If draft exceed –0.06 in. W.C a barometric damper

should be installed on the smoke pipe. Never install a manual damper.

REDUCER

DIAMETER 7 "

For a proper installation, follow the advices below:

1. All the joints of the evacuation pipe must be secured, using three screws.

Make sure that each screw goes through the inner walls of both connectors (male and female). See

pictures below showing a male-female coupling.

PROPER INSTALLATION

IMPROPER INSTALLATION

CAUSE RESTRICTION

2. A minimum rise of 1/4 inch per horizontal foot must be respected.

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DAMPER

The barometric control must be adjusted so that the maximum draft measured at the furnace outlet is limited to -

0.06 in. w.c. Please note that a draft higher than -0.06 in. w.c. could result in an uncontrollable fire. On the other

hand, the minimum draft to be respected is -0.04 in. w.c. in the evacuation pipe on the solid fuel side.

3.4

COMBUSTION AIR

In the event that the furnace and the chimney are completely cold, it might be necessary to provide fresh air by

opening a door or a window for a few minutes during the lighting procedure.

Take note that a house constructed or renovated in order to be airtight is liable to lack fresh air necessary for a

proper combustion and operation of flame producing heating appliance.

In such a case, when starting up the fire, do not operate appliances which evacuate air outside the house such

as:

Range hood

Air exchanger

Clothes dryer

Bathroom fan

Ventilated central vacuum system

NOTE:

It is recommended to install an outside air inlet of minimum 4” diameter in the room where the heating appliance is

installed (see drawing below). To do so, it is preferable to choose a wall that is not exposed to dominant winds,

depending on the conditions surrounding your house.

.B. The owner of the furnace is responsible for the room salubrity in case of negative pressure or

3.5

ELECTRICAL CONNECTION

The following instructions do not supersede the local code.

HOTBLAST 1950

On the Hotblast 1950 the combined limit control is installed with the support provided on the left side of the

appliance (two holes are predrilled on the edge of the furnace), and connected to the electrical box along with the

transformer. Install the damper motor on the right side of the front facade above the door (use pre-drilled holes).

The chain that links the air inlet latch to the motor must have a play of 1/8 in. When there is no call for heat, the air

inlet latch must be completely shut and the chain must be affixed to the damper motor at the “8 o’clock” position. *

WARNING: USE WIRES SUITABLE FOR 75^OC (167 ^OF) ONLY.

* (With all reserves on the minimum combustion air to be increased depending on the type and quality of the

combustible).

3.6

THERMOSTAT

The thermostat must be installed on an inside wall in a location where it is not likely to be affected by the draft

coming from an air outlet. It must be installed at a minimum of 55 inches above the floor.

3.7

FAN CONTROL

The fan control setting may vary depending on the type of installation; the “fan OFF” temperature is preset at

110^oF and the “fan ON” at 150° F at the factory. This setting should provide a proper operation for most

installations.

For a prolonged operation of the blower, it is preferable that the “fan OFF” setting be low enough. But a “fan OFF”

setting too low will cause undesirable cold air circulation. To modify the setting, move the tab on the temperature

dial of the fan limit control at the desired position.

The adjustment of all controls must be performed by a qualified technician. The controls setting and the blower

speed must conform to the recommendations of the “Warm Air Heating and Air Conditioning National Association”.

To obtain a continuous air circulation during summer, move the manual switch ON.

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4. OPERATING INSTRUCTIONS

Control system

On the wood only furnaces , the thermostat controls the air inlet damper. When the thermostat calls for heat, the

damper opens and the fire burns up. When the furnace gets hot enough, the combined limit control activates the

blower motor at the speed selected for wood heating.

The chain that links the air inlet damper to the motor must have a play of 1/8 inch. When there is no call for heat,

the air inlet damper must be completely closed and the chain must be affixed to the servo-motor at the “8 o’clock”

position. *

* (With all reserve on the minimum air to be increased depending on the type and quality of the combustible).

4.1

LIGHTING

1. Open the door

Note: In the case that there is a bed of coals in the bottom of the furnace, go to step b) Pre-heating.

2. Remove the steel plate on the ash grid and dump the ashes in the ash drawer.

3. Put the steel plate back in place, making sure it is properly seated. The steel plate on the ash grid is intended to

optimize the heat retention into the combustion chamber.

4. Place one or two dry kindlings at the front of the combustion chamber.

5. Place newspaper strips on top of the kindlings.

6. Cover the newspaper with more kindlings and small pieces of dry wood.

7. Add newspaper strips, then light the fire as low as possible and leave the door 1/2" (13 mm) opened. If lighting

fails , you might experience a back draft through the air inlets.

4.2

PREHEATING

1. Once the kindling is well ignited or the coals revived, put 2 or 3 fire logs in such a way that the flames can

interlace between the logs then close the door. It is important to respect these loading sequences so that the

wood burns from the front to the back of the furnace.

2. Wait 15 to 20 minutes, then proceed with loading the furnace.

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4.3

HEATING

1. When loading the furnace, spread the coal and embers evenly in the center of the combustion chamber before

adding new logs.

2. Do not overload. Air must circulate freely in the upper part of the combustion chamber in order to obtain an

efficient operation of the appliance. Please note that a small hot fire will produce much less residues than a large

smouldering one.

IMPORTANT: DURING THE HEATING PROCESS, REMOVE THE ASHES AND WOOD THAT COULD

OBSTRUCT THE 1/4" (6.4 mm) HOLE LOCATED BELOW THE DOOR INSIDE THE FURNACE.

PROCEDURE TO OPEN THE LOADING DOOR

TO MINIMIZE THE RISK OF SMOKE SPILLAGE, OPEN THE DOOR 1”

AND WAIT ABOUT 10 SECONDS BEFORE OPENING COMPLETELY.

THE PURPOSE IS TO STABILIZE THE PRESSURE INSIDE THE FURNACE.

4.3.1 EARLY SIGNS OF OVERFIRED FURNACE

1. Roaring fire.

2. Chimney connector is glowing red.

3. Extreme heat coming from the furnace.

4. If this occurs, DO NOT OPEN THE DOOR, shut-off the air inlet opening completely, and wait until the glow has

completely subsided.

ALWAYS KEEP THE DOOR AND THE ASH DRAWER CLOSED

(except for lighting and maintenance).

4.3.2 WOOD AS HEATING FUEL

We recommend that you burn seasoned hardwood only.

There are two important factors to be considered when choosing a type of wood: the moisture content and the

wood density. Dry hardwood, such as maple, oak and beech will provide better results because of the high density

and minimal tar produced during combustion. It is highly recommended to use wood that has been dried at least six

months. Do not use coal as heating fuel in this appliance.

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Whenever a high amount of smoke is noticed in the room, you must:

1. Open doors and windows.

2. Make sure the furnace door is closed as well as the damper (if necessary, lower the thermostat starting point or

undo the chain of the damper and close the barometric draft control manually).

3. When the furnace has cooled down, inspect the chimney to detect obstructions and consult a specialist to

determine the cause of the smoke spillage.

CARBON MONOXYDE IS A LETHAL GAS (ODOURLESS AND COLOURLESS), WHICH YOU MUST

BEWARE OF.

4.3.3 CHIMNEY FIRES

They might occur when the fire gets extremely hot; burning paper, cardboard, branches or small pieces of wood

can ignite the creosote residues accumulated in the evacuation flue system. The usual signs are:

1. Rumbling

2. The flue gets extremely hot

3. Sparks are coming out of the chimney

In case of a chimney fire, call your local fire department immediately and sprinkle the

roof around the chimney with water.

Make sure that the furnace door is closed as well as the damper (if necessary, lower the thermostat starting point

or release the chain from the damper and CLOSE the barometric draft control manually).

If the fire gets uncontrollable due to improper use or because the draft is too strong, follow the same procedure

as in a chimney fire except that you will have to OPEN the barometric draft control manually.

LOCAL FIRE DEPARTMENT.

Phone number: ___________________________________

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5. MAINTENANCE

5.1

MAINTENANCE OF THE EXCHANGERS

The evacuation pipe and the exchangers should be inspected regularly during the burning season. Easy access

is provided (without the use of tools): unscrew the wing nut on the exchangers access door. See pictures below.

Wing nut

Insulation

pad

Exchangers cover

Before cleaning the three exchanger pipes, move the upper plate of the combustion chamber forward. Using the

scraper, clean the three exchanger pipes. The accumulated dirt in the lateral exchangers will fall into the

combustion chamber; the dirt in the central exchanger will have to be removed from the front or the back of the

furnace. After cleaning the exchangers, make sure that the upper plate is free of ashes and do not forget to push

the upper plate back to its original position. Finally, close the exchanger access door.

HOTBLAST 1950

SECTION VIEW

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5.2

CHIMNEY MAINTENANCE

One of the most efficient methods is to sweep the chimney is using a hard brush. Brush the chimney downward

so soot and creosote residues will come off the inside surface and fall at the bottom of the chimney where it can be

removed easily.

The chimney must be checked regularly and if creosote has accumulated, it must be removed without delay.

Cleaning on a monthly basis should be sufficient during the coldest months.

Smoke flue inspection

The smoke flue should be inspected regularly during the heating season.

If possible, the smoke flue should be dismantled and cleaned.

The flue should be inspected to detect any damage.

If no damage is noticed, put the flue back in place; otherwise, it must be replaced.

Use only wood as a combustible.

Seasoned hard wood logs 18” to 22” long are recommended as a combustible.

5.3

MAINTENANCE OF THE BLOWER MOTOR

The two bearings of the motor must be lubricated once a year using non detergent SAE 20 oil.

DO NOT OVERLUBRICATE

FILTERS

The blower must not be operated without the filters. In order to operate a slow combustion heating system

efficiently and safely, you have to ensure regular maintenance. This means that the chimney, the joints and the flue

must be kept in good condition and the air filters must be cleaned or replaced regularly. Use the same size and

same type as the original filters.

Filters dimensions

Filters 12” x 24” (HOTBLAST 1950 part number 53-005-035)

5.4

DOOR GASKET MAINTENANCE

It is important to maintain the door gasket in good condition. After a while, the gasket might sag; a door

adjustment may be then required.

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Door adjustment procedure:

1. Unscrew completely the locking pin (see picture below).

Locking pin

2. To increase the pressure of the door on the gasket, turn the handle counter clockwise; to decrease the pressure

on the door on the gasket, turn the handle clockwise.

3. Finally, screw back the locking pin about 1/4” deep, make sure you lock it in place with the nut.

6. REPLACEMENT PARTS

Your HOTBLAST furnace is designed to burn clean and require little maintenance. It’s recommended to conduct a

visual inspection at least once a month to uncover any damage on the unit. Make necessary repairs as soon as

possible with genuine Hotblast replacement parts.

DOOR GLASS

•

Inspect the glass regularly to detect any breakage or failure. If you find any defect, stop the furnace

immediately. Never operate a furnace with a broken glass.

If you have to change your door glass, you must use Pyroceram 3/16”(5mm) thick glass available at your

HOTBLAST authorized dealer.

To replace the glass, remove screws that hold the glass retainers in place. Remove these retainers and

replace the glass. The glass gasket should be replaced at the same time. To put back in place, follow the

same procedure backwards.

•

Do not use an abrasive cleanser. Special cleansers for wood stoves glass are available in any good

hardware store.

Clean glass ONLY when the unit has cooled down.

GASKET

We recommend to replace the gasket that seals the door once a year, in order to maintain a good control of the

combustion for maximum efficiency and security. To replace your door gasket, remove the old gasket and glue.

Clean the surface thoroughly, apply glue sold for that particular use, and put the new gasket onto the door. Wait for

at least 2 hours before lighting your furnace.

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A R N S F K O C T B L A

R E D

U E B L

E T W H I

B L A C K

E T I W H

B L A C K

C H S W I T

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8. HOTBLAST 1950 TECHNICAL DATA

HOTBLAST

1950

47”

25 ½”

47 ¼”

15 ⅞”

28”

24 ½”

44”

* 7”

FLUE

WEIGHT

560

* Reducer required

8.1

GENERAL TECHNICAL DATA

TEMP

VAR.

(^OF)

MODEL

DIRECT DRIVE

MOTOR SPEED

OUTPUT

BTU/ HR STATIC PRESSURE

FILTER

(2)

FAN

DD-10

(CFM)

(WOOD)

MIN.

MAX.

H₂O

HOTBLAST 1950

1/3

3 or 4

1300

140000

0,2

0,6

12” x 24” X 1”

8.2

TECHNICAL DATA – ELECTRIC CONNECTION REQUIREMENTS

OUTPUT TEMP. VAR.

(CFM)

(^OF)

AMPS

TOTAL REQUIRED GAUGE SINGLE PHASE

15 120

BREAKER FEEDER

VOLTAGE

ELEMENTS

QTY

MODEL

WOOD

BTU/HR

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11. TROUBLE SHOOTING

PROBLEM

CAUSES

SOLUTIONS

Heating inefficient during the first

combustions. Lack of draft.

Improper adjustment of the

Adjust the damper, minimize the

barometric damper (opened too

wide). Chimney flue restriction (too

long., or too many 90^oelbows)

chimney length and use 45^oelbows.

Furnace heats well, warm air plenum Improper installation of the ducts,

is very hot by there is not much heat little static pressure, unbalanced

Reinstall the ducts correctly.

Respect the minimum static pressure

of 0.20 in. w.c.

coming out in the room.

system (too many warm air outlets

and not enough cold air inlets).

Furnace consumes a lot of wood.

The thermostat which controls the

damper is continuously activated or

is too close to a source of cold air.

Damper not properly adjusted.

Relocate the thermostat. Adjust the

chain that links the damper to the

damper motor. Rebalance the

ventilation system in order to

House not insulated enough. Ash

increase the air flow in the room

drawer is not tightly closed. Furnace where the thermostat is located.

too small for the surface to be

heated. Unbalanced ventilation

system, very little heat where the

thermostat is located.

Fan start-up is too slow.

Fan “ON” setting too high. Return air Lower the temperature starting point.

is too cold (temperature lower than

65 degrees). Limit control not well

located in the warm air plenum.

The “fan ON” setting on limit control

is set at 150°F, it may reduced in

some particular installations. Reduce

the fresh air flow. Relocate the limit

control.

A lot of creosote, moderate heat

output.

Wet wood, lack of draft. Barometric

damper not properly adjusted. Dirty

chimney.

Use dry wood. Adjust the barometric

damper. Clean the chimney flue and

the furnace exchangers.

Furnace heats a lot but the warm air

plenum does not get hot.

Wet wood or low grade wood. Too

much cold air return for the hot air

ducts. Unbalanced ventilation

system. Blower speed too high

Use dry wood. Reinstall the

ventilation system correctly. Use a

lower blower speed.

IMPORTANT NOTE

FOR, INSTALLATION OF A CENTRAL HEATING VENTILATION SYSTEM, IT IS HIGHLY

RECOMMENDED TO CONSULT A HEATING SYSTEM VENTILATION SPECIALIST.

N.B.: UNITED STATES STOVE COMPANY IS NOT RESPONSIBLE FOR POOR APPLIANCE

PERFORMANCES, DUE TO AN IMPROPER INSTALLATION.

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