VF3000 Coal Stoker Boiler

Installation & Operating Manual
VF3000 Coal Stoker Boiler
Please read this entire manual before you install and use your new room heater. Failure
to follow instructions may result in property damage, bodily injury, or even death.
INSTALLATION DIRECTIONS. INSTalLATION should be performed by a qualified installer.
Contact your local authority (such as municipal building department, fire department, fire
prevention bureau, etc.) to determine the need for a permit.
this appliance is also approved for installation into a shop.
save these instructions.
Specifications 5
Hot Water Coil
Packing List7
Verti-Flow™ Stoker Control
Feed Adjustment19
Aquastat Installation23
Wiring Diagrams22
Warranty 25
 = Contains updated information
Harman® Central Heating Appliances are built and tested to be complete Home Heating solutions. As with any
Central Heat system, a backup heating system may be required in the event of power outages or during appliance
service or maintenance.
The VF 3000 Stoker Boiler features our patented Verti-Flow™ Coal Feeder. The VF 3000 has a 5,000 to 95,000 BTU range
and 250 lb. coal hopper capacity.
An aquastat is used to activate the feeder when more heat is needed to maintain the set water temperature. When the
Aquastat senses the water is at the set temperature the feeder stops feeding coal. Now the Verti-flow™ Stoker Control takes
over to maintain a very low fire until more heat is needed.
Properly installed and maintained, your VF 3000 will heat your home for a lifetime. Therefore, have your unit professionally
installed. Consult with your Harman® Dealer regarding proper maintenence.
Specifications/Hot Water Coil
Hot Water Coil
To install a hot water coil:
1. Remove the blank plate covering the water coil opening.
2. Insert the coil into the boiler as shown. Be sure to put a new gasket around the coil plate.
3. Tighten all bolts evenly.
4. Fill the boiler and check for leaks before and after the boiler is up to temperature. Rust caused by a leak can reduce the
life of the boiler.
5. A tempering valve may be installed between the in and out pipes to reduce the maximum water temperature at the tap.
NOTE: This hot water coil is rated at 4 gallons per minute.
Never sleep in the same room with any coal burning stove.
Always empty the hopper when not burning for more than a week. When left standing for long periods with wet coal, the
pusher block will rust and corrode, causing it to seize. If the stoker is then turned “on”, damage to the pusher assembly and
feed motor will result. This will be considered neglect and will void the warranty on those parts. Always check to see if moving
parts are free before using if the unit has not been burned for a period of time. This can best be determined by shaking the
adjuster rod.
Freshly delivered coal is typically watered down to minimize dust when loading and unloading. Wet rice coal does not flow as
well as damp or dry coal, and may bind or bridge in the hopper. We do not recommend loading your hopper with wet coal. If
you must burn wet coal, the feed rate will likely need increased, in order to get the same size fire. As the wet coal in the hopper
dries out, the feed rate will need decreased to avoid over-feeding. Using wet coal, in an emergency, will likely not damage
your stove as long as it is hot and burning at the time. The damage is caused when the hopper has wet coal in it when the
stove is cold. This will cause rust and corrosion which is considered neglect and will not be covered by the product warranty.
Appliance Placement: The VF3000 must be installed on a non-combustible floor. The non-combustible floor must also extend
a minimum of 18” in front of the firebox door, and 8” to the sides. Maintain a minimum of 18” of clearance to combustible
walls, 24” to the ceiling and keep combustible materials a minimum of 36” away from in front of the appliance.
This boiler may be connected to an existing boiler heating system. Inter-connection may be done in a series or parallel
configuration. Consult with your licensed plumber or HVAC professional to determine the most effective installation for your
heating needs.
This unit must be connected to a chimney capable of providing a -.04 minimum draft.WARNING: If the chimney has no draft,
coal gases may escape from the unit and stove pipe. These gases are toxic and can be fatal. It is recommended that a CO
detector be installed to warn of this condition.
Packing List
NOTE: Although required for unit
completion, the Feeder and Hopper are
sold as separate items.
Adapter Plate
Pressure Relief
Aquastat-(3 Pieces)
and Sensor
(2) Grate Inserts
Grate Holder
with Gasket
Combustion Blower
Left Side
Hopper - Sold
Cleaning Rod
Spring Handle
Right Side
Clean out slide
Base Jacket
Flue Pipe
Ash Tub
Flue Plate
Ash Door
The VF3000 is reversible as to which end the hopper and
flue pipe are located. Therefore, a decision must be made
as to which way will work best for your situation.
If you woud like to have the flue to the right and the hopper
to the left, make sure the gaskets are in place on both the
flue pipe and flue plate. Bolt the flue pipe on the right end
and the flue plate on the left end of the base. Next, the baffle
must be slid into place on the right end with the center of the
base. Note the baffle and flue pipe must always be at the
same end and opposite the hopper.
Next, place the base jacket around the base and clamp into
place with the four clamping bolts on the front of the base.
The hole in the jacket goes around the flue pipe.
Place 1/4” x 1” gasket around the flat edge on top of the
base. Now place the boiler on top of the base with the feeder
opening opposite the flue pipe. Place 1/4” x 1” gasket around
the door openings on the boiler. Bolt the door mount on the
front door opening with 5/16” x 1” flat head bolts. Bolt the
door blank on the rear opening with 5/16” x 1” hex head bolts.
Now the outer jacket can be installed. The front jacket with
the coil hole must be installed first. Next, the two sides which
hold the front in place and then the top which holds the sides
in place.
Hopper right, flue left
Hopper left, flue right
Begin assembly by sliding the pusher block with the adjuster rod from the front through the slot shown in Fig. 1. Be sure the
pusher block is turned with the bolt hole to feed indicator side. Next, hold pusher block in the most rearward position and
slide the adjuster tube over the adjuster rod until it bottoms out on the pusher block. Thread the adjuster, then the wing nut
on the end of the adjuster rod.
Put gasket around the opening on the adapter plate. Slide the feeder through the plate and bolt together with two 5/16 x 3/4”
bolts. Next, install the grate holder.
Fig. 1
The grate is composed of four pieces: the grate holder, (2) grate
inserts, and firebrick angle. The firebrick angle is bolted to the grate
holder with (2) 3/8” x 1 1/4” bolts. Before installing the grate holder,
3/8” round gasket must be checked in the groove on the bottom
side of the grate holder, as shown in fig. 4. Check to be sure the
gasket has not been damaged. Locate the flange at the rear of the
grate holder into the slot on the feeder as shown at left. Bolt the
front end down snug with the 1/4” x 20 allen bolt and nut provided.
The rear end will be locked in place by the flange.
Before completely tightening the bolt, be sure the grate holder
is back as far as possible and centered side to side on the
feeder opening.
Fig. 2
Fig. 4
Fig. 3
Snug these bolts only.
Grates and Firebrick
Lay the two grate inserts into the grate holder as shown.
Divide the spaces between the grates equally and be sure
they are not tight. The spaces are needed for expansion.
The grate inserts can also be installed or removed after the
feeder is in place.
Place the two firebricks on the grate angle and make the two
bolts snug on the adapter plate as shown.
Apply 1 inch flat gasket around the feeder opening and insert
the feeder and adapter plate into the boiler and tighten.
NOTE: You will need a 3/4” socket to do this.
Remove one of the screws on the intake screen, and install
the blower restrictor plate. Install the blower on the bottom
of the feeder by sliding it into the bracket as far as it will go.
NOTE: The bolt holes on the blower flange are not used.
Control Box
Install the control box on mounting pad provided on the side
of the stoker with (4) #8-32 bolts and nuts.
Plug the gear motor into the top receptacle, and the
combustion blower into the middle receptacle on the control
box. The bottom receptacle is not used.
Insert small end of hopper into the hopper slot on the feeder.
Push top of hopper under the hopper support, causing the slot
on the bottom side of the support to hook onto the hopper.
The hopper support will spring up slightly for the hopper to
go under. If you have difficulty getting the hopper under, you
can raise the top slightly
The feed motor cover can now be installed.
Chimney Connectors and Chimneys
Draft is widely misunderstood. It is important that you, the
stove operator, realize that draft is a variable effect, not a
given quantity. Stoves and chimneys do not have draft, yet
draft is the key to your stove’s performance.
Draft is a force, produced by an operating stove and the
chimney to which it is attached. It is created by hot gases
rising up the chimney, creating a pressure difference between
the inside of your home and the outside air. It continually
moves fresh combustion air into the stove, and hot exhaust
gases out of the stove; without this constant flow, the fire
will go out.
Other factors, such as barometric pressure, winds, the
tightness of the home, the total inside chimney volume,
chimney height and the presence of venting devices such
as exhaust fans also play a role in maintaining an adequate
draft. Low barometric pressures, super insulated homes,
and exhaust fans can reduce draft; winds can play havoc
with draft; and too large or too small a chimney volume can
cause reduced draft due to the excessive cooling or not
enough room to vent the exhaust gases. Introducing outside
air directly to the stove may help remedy a low draft problem.
Some signs of inadequate draft are smoking, odor, difficulty
in maintaining the fire, and low heat output. Overdraft can be
caused by a very tall chimney even if it is the recommended
size, and can cause overfiring of your stove. Signs of an
overdraft include rapid fuel consumption, inability to slow
the fire, and parts of the stove or chimney connector glowing
red. It is important that you follow the chimney guidelines in
this manual, including size, type, and height to avoid draft
When installed and operated according to this manual, the
appliance will produce enough hot gases to keep the chimney
warm so that adequate draft is maintained throughout the
burn cycle.
Chimney Connectors
In general, following these guidelines will ensure compliance
with all national and provincial codes; prior to beginning your
installation, check with your local building code official(s)
regarding any additional local requirements or regulations
which may influence the design and placement of your
venting system.
The VF3000 may be installed with (.6 mm) 24 gauge chimney
connector pipe. The size of the connector should correspond
to the size of the flue collar opening. Do not use makeshift
No part of the chimney connector may pass through an attic
or roof space, closet or other concealed space, or through
a floor or ceiling. Whenever possible, avoid passing the
connector through a combustible wall; if you must, use an
approved wall pass-through, described later in this section.
Assemble the connector beginning at the flue collar, with the
crimped ends pointing towards the stove (to keep debris and
creosote flakes inside the system). Each joint, including the
one to the stove’s flue collar and the one to the chimney itself
should be secured with at least three sheet metal screws.
Screws may be a maximum of 3 inches apart. A 1-1/4" (32
mm) overlap is required at each joint, including the flue collar
attachment. No more than two 90 degree elbows should be
used, and the total length of connector should not exceed
10 feet (3m) All horizontal runs of connector must have a
minimum upward slope of 1/4" per foot (20 mm per meter).
Wall Pass-thrus
Occasionally it is necessary to pass the chimney connector
through a combustible wall to reach the chimney. Depending
on your local building codes, and the pertinent provincial or
national codes, there are several choices for accomplishing
this safely. Before beginning your installation, contact local
officials, and also the chimney connector and chimney
manufacturer for specific requirements.
Canada. Three methods are approved by the Canadian
Standards Association. The diagram shows one method
requiring an 18” (460 mm) air space between the connector
and the wall. It allows use of one or two covers as described
in the diagram. The other two methods are described in detail
in the current issue of CAN/CSA B365, the national standard.
United States In the U.S., the national code is NFPA 211.
While many localities adopt this standard, be sure to check
with local authorities before beginning your installation.
The NFPA (National Fire Protection Association) permits four
methods for passing through a combustible wall. A commonly
used method to pass through a wall directly to a masonry
chimney is to clear a minimum 12”(305 mm) around the entire
chimney connector, and fill it with brick masonry which is at
least 3.5”(90 mm) thick. A fireclay liner, minimum 3/8” (9 mm)
wall thickness must run through the brick wall to the chimney
liner (but not beyond the inner surface of the liner). It must
be cemented in place with refractory cement. This method
is illustrated. For details on the other three options, refer to
the most recent edition of the NFPA 211 code.
Minimum 2" (50mm)
Clearance to Brick
Combustible Material
Chimney Flue
Hole with a minimum
clearance of 18" (450 mm)
between connector and
Non-combustible cover,
one side only. If two
covers are used, each
must be mounted on
non-combustible spacers
at least 7/8" (21mm) away
from the wall.
Minimum 12"
(300mm) to Brick
Fire Clay
Masonry Chimney Built to
NFPA 211 Specifications.
1" (25mm)
Minimum 12" (300mm)
to Combustibles
The Chimney
This unit must be installed into a chimney approved for use
with solid-fuel appliances. In the U.S., it must be connected to
(1) a prefabricated chimney complying with the requirements
for Type HT chimneys in the Standard for Chimneys, FactoryBuilt, Residential Type and Building Heating Appliances, UL
103, or (2) a code-approved masonry chimney with a flue
In Canada, this unit is listed for use with prefabricated
chimneys tested and listed to the high temperature (650
degrees C) chimney standard, ULC S-629, or with a code
approved masonry chimney.
The minimum recommended height for any chimney is
16 ft (4.8 m) above flue collar height. A round flue (either
masonry or approved prefabricated), of either 6" (150 mm),
7" (180 mm) or 8" (200 mm) may be used. For square or
rectangular masonry chimneys, nominal sizes of 8" x 8" or
8"x 12" (200mm x 200 mm, 200 mm x 300 mm) may be used.
Codes require that solid-fuel chimneys extend 3 ft (0.9 m)
above the highest point at which they exit from the roof. Then,
the chimney must extend 2 ft.(6 m) above the highest point
within a 10 ft (3 m) radius. Thus, the 3 foot, 2 foot, 10 foot rule:
3ft. - Above roof exit point
2ft. - Higher than anything within
Do not connect this unit to a chimney flue servicing
another appliance.
This VF3000 Is Approved To Burn Anthracite “Rice”
Coal Only.
More Than 10 ft. (3m)
10 ft. (3m)
2 ft. (0.6m) min.
Height Necessary
Above Any Roof
Surface Within 10ft.
3ft. (0.9m)
The 3-foot, 2-foot, 10 foot rule
10ft. of the chimney.
Existing Masonry Chimneys
If you plan on using a pre-existing masonry chimney, have
it thoroughly inspected and cleaned. Any faults which make
the chimney unsafe and unusable must be repaired prior to
use. These can include improper height, structural defects,
blockages, inadequate clearance to combustibles, unsealed
openings into other rooms of the house, signs of creosote or
smoke leakage, a loose or absent clean-out door, or absence
of a liner.
Venting to a Masonry Chimney
When connecting to a masonry chimney, several provisions
are standard. First, whether the chimney connector is vented
to the chimney through a thimble or a breech pipe, neither
must pass beyond the inner surface of the chimney liner,
and both must be firmly cemented in place with refractory
cement. (A thimble is a masonry pipe which is inserted
through the chimney wall, and is frequently the preferred
method; a breech pipe is a piece of steel pipe used the same
way.) In Canada, a breech pipe has ridges or protrusions to
lock it firmly into the refractory cement. In either case, the
chimney connector vents to the chimney through the thimble
or breech pipe.
Using a thimble, the connector slides completely inside the
masonry to the inner edge of the flue liner, and may be easily
removed for chimney and connector inspection. A breech
pipe must extend at least 2” (50 mm) into the room, so the
connector can be attached with sheetmetal screws.
Venting to a Masonry Fireplace Chimney
In some situations, a code compliant chimney originally
used for a masonry fireplace may be used to install your
stove. In addition to the requirements found in the previous
paragraphs, it is important to be aware that all clearances
must be met, including those from the chimney connector to
combustibles. Do not forget to include floor protection in your
plans. (See Clearances and Floor Protection in this section.)
Since many fireplaces have exposed wooden mantels and
trim, pay special attention to the clearances necessary to
these materials.
If your fireplace chimney is behind a combustible wall, you
must use an approved wall pass-through system to gain
access to the masonry chimney. The chimney connector
must enter the chimney at a place where it is lined, and
the fireplace must be made inoperable. For example, you
might remove the damper, replacing it with a secure, airtight,
noncombustible seal (removable for inspection); this also
satisfies the requirement that no room air must be allowed
to enter the chimney.
Do not burn any fuel other than coal. Never use highly volatile
substances in your stove, such as gasoline, which could
cause an explosion.
When solid fuels are burned completely, they produce
water and carbon dioxide. However, in long slow burns, a
substantial amount of carbon monoxide may be produced.
If allowed to build up, carbon monoxide (which is odorless)
can prove fatally poisonous. Proper ventilation and draft will
prevent this from happening. If you smell smoke, thoroughly
ventilate your dwelling. Contact your dealer to arrange for
a draft test.
Other causes of poor ventilation or draft are icing, exhaust
fans, a blocked outside air inlet, and room air starvation. If
your stove is sluggish and you get occasional odor, check
these possibilities and increase the air flow in your home.
Installing to a Prefabricated Chimney
When venting your stove using a prefabricated chimney,
be sure to contact local building code authorities, and to
follow the manufacturer’s instructions exactly. Use only
the manufacturer’s parts; do not use makeshift installation
techniques. All prefabricated chimneys must be tested to
either the U.S. or Canadian high-temperature standards, UL
103 or ULC S629.
Do not connect the venting to any air distribution duct or
Aquastat and Wiring
See page 23 for assembly and mounting details. Pay close attention to the jumper positioning inside the A350 and S350
controls. Also note the sensor and its wire length when considering the mounting location. Remember that 212° f. is boiling
temperature and must be avoided. Be sure to incorporate a means for flowing water in the event of an over-heat condition.
Coal can not just stop burning when there is no demand for heat. Never fire a boiler with no water in the system. Serious
consequences will result.
Basic Plumbing
This is a basic plumbing hook up. Your system may vary depending on many factors. Therefore, we recommend having
experienced personnel do the plumbing.
This is only one of many layouts possible. Cirulator pumps, zone valves, and thermostats are not supplied with the unit
because the amount and type of these parts vary with every system. It is best to have a professional plumber do the job.
Fresh water in- with
automatic fill
Heated domestic water
Air Scoop
System Return
System Supply
Tempering Valve
Expansion Tank
Temp. / Pressure Gauge
Aqua Sensor Well
Pressure Relief
Circulator Pump
Boiler Drain
Place the boiler a minimum of 18” from a wall. The flue pipe must be at least 18” from anything combustible. The rear of
the hopper should be a minimum of 36” from the wall. The boiler should be placed on a non-combustible floor. Secure all
chimney connector pipe joints with a minimum of 3 sheet metal screws.
Draft Test Procedure
Attach a draft meter to the vent pipe on the boiler side of the barometric damper (if installed). With a fire established, the
chimney draft should be between -.04 and -.06 inches of Water Column. If the flue draft exceeds these readings, install and
adjust the barometric damper accordingly.
DO NOT operate if the flue draft exceeds -.10 inches Water Column ( -24.9 Pa).
Next, remove the allen head set screw from the center of the firebox door and attach your draft meter. The firebox draft
should be -.04 to -.05 in W.C. Adjust the combustion blower restrictor plate, closed to increase the draft or open to decrease
firebox draft.
Combustion Blower
Restrictor Plate
Verti-Flow™ Stoker Control
0.75 A
1.25 A
0.5 A
Verti-Flow™ Stoker Control
This section describes the features and operations of the Harman® Verti-Flow™ Stoker
Control. The timers are adjustable from 0 minutes to 15 minutes in 1 minute steps. There
are red lights on the front panel to show proper operation of the timer. One indicator
shows power is applied to the unit. The other three indicators show when power is
available at the adjacent receptacle.
The stoker control will be mounted on the side panel of the feeder directly below the
coal hopper. The three receptacles and switch will be facing forward while the power
cord, 3 AMP fuse access port and the thermostat connections will be to the rear.
Verti-Flow™ Stoker Control
The Verti-Flow™ Stoker Control
How to operate the Stoker Control
The top receptacle (0.5 A) provides power to the coal feeder
motor. Thus, the plug from the coal feeder motor should be
inserted into this receptacle.
There are four operator interfaces on the Stoker Control. The
operator interfaces are: one (1) rocker switch and three (3)
16-position rotary switches.
The center receptacle (0.75 A) provides power for the
combustion blower motor. Thus, the plug from the combustion
blower should be inserted into this receptacle. The bottom
receptacle (1.25 A) is not used.
The rocker switch is a power switch that controls only the
coal feeder motor. For normal operation this switch should
be placed in the “on” position. This switch’s operation can be
verified by a small red light above the coal feeder receptacle
being on when the switch is on. The off position is used for
lighting the fire.
The thermostat connections on the back panel of the stoker
control are .25 inch male quick connect terminals. The
mating connectors (supplied) should be .25 inch female
quick connector terminals. The wire should be no smaller
than 22 gauge.
The thermostat connections should be connected to the
aquastat as shown on the wiring diagram.
The AC power cord should be the last connection made. The
power cord should be plugged into a 115 VAC / 60 hertz wall
outlet, which has proper grounding available. This 115 AC
volt wall outlet should also be capable of handling 3 amps
of current because this is the maximum amperage this unit
will draw.
The other three switches are the customer’s adjustments for
the timers (on timer, off time, distribution blower time). These
switches can adjust each timer individually from 1 minute to
15 minutes in 1 minute increments. Do not set pilot mode
timers to 0.
The “on” time and the “off’ time should be programmed
to a minimum time that keeps the coal burning during the
maintenance cycling mode. The distribution blower time
should be set to 0. This is because the VF 3000 doesn’t have
a distribution blower. The Verti-Flow™ Stoker Control is also
used on the Magnum Stoker which does use this timer.
Recommended timer settings to start are: “on” 4 minutes, “off”
12 minutes, extend timer 0 minutes. You may find that these
settings produce too much heat in pilot mode. If so, you can
reduce the “on” time and increase the “off” time. However,
we do not recommend going below 4 minutes with the on
time for efficiency reasons.
DANGER- Risk of Fire or Explosion;
DO NOT burn garbage, gasoline, drain
oil or other flammable liquids.
CAUTION- Hot While in Operation;
- Keep Children Away
- Do Not Touch
Fill the boiler and plumbing system with
water prior to lighting!
Starting a fire
Feed Indicator
Fill the hopper with rice coal. With the aquastat calling for
heat, the coal will begin to feed onto the grate inside the stove.
This process can be accelerated by adjusting the feed rate
to the maximum position. When the coal starts to come up
out of the grate and is almost up to the area where the holes
start, turn the feed adjuster back about 2 turns and turn off
the feed motor with the switch on the side of the control box.
Whether using wood pellets, charcoal, or kindling and paper,
mix your starter material with the coal on the grates, for best
results. Use a match to light the fire or starting material.
After the coal is burning, the feed motor can be turned on and
the coal fire will continue to get larger. Fresh coal will continue
to be pushed onto the grate and ashes will be pushed off the
grate. The feed rate must be adjusted so the coal is burned
up and turned to ashes before the coal gets to within one
inch of the end of the grate. Too high of a feed rate will push
unburned coal off the coal grate, therefore wasting fuel.
Feed Adjustment
The feed indicator on the side of the feeder shows how far
the pusher moves each stroke. There are dots above the
indicator spaced 1/8” apart. A movement of one dot would
give a low burn, two dots medium and three dots high. Lock
the adjuster with the wing nut after adjusting feed rate.
After the fire is burning and the feed rate is adjusted, you
can now set the aquastat to the desired water temperature.
Ash Removal
With each hopper of coal that is burned, approximately one
ash pan full of ashes must be removed. Failure to remove
ashes will result in a blocked grate and the fire will not burn
properly. Remember, the ash pan will be hot, so always wear
protective gloves.
Ashes should be placed in a metal container with a tight
fitting lid. The closed container of ashes should be placed
on a non-combustible floor or on the ground, well away
from all combustible materials, pending final disposal. If the
ashes are disposed of by burial in soil, or otherwise locally
dispersed, they should be retained in the closed container
until all cinders have thoroughly cooled.
The small tray in the side of the stoker should be removed
and emptied.
The spring handle located at the center of the unit should
be cycled in and out several times. This action cleans the
interior of the heat exchanger and causes the dust to fall
into the ashpan.
Every 3 months:
The grate “clean-out” slide should be opened and reclosed
as shown in drawings below.
In the “closed” position, be sure the “grate clean-out” plate
slide is straight across as shown.
Baffle slide
The easiest way to handle this slide is through the ash door
with a poker inserted into the hole at the end. The purpose
of this operation is to let any ash build-up, under the grate,
fall into the ash tub.
This operation can be performed while the unit is burning.
However, you should first lower the thermostat to lower the
stove temperature and be sure you are wearing protective
The operation can also be performed when the unit is not
burning by lifting the grate inserts out and removing the ash
with a vacuum cleaner.
Slide open
Remove baffle slide as shown and remove fly ash.
Slide closed
The end of the heating season is the best time to perform
annual maintenance. Rust and corrosion can form much
faster in the high humidity of summer, so cleaning your VF
3000 will prevent those damages.
1. Remove all coal from the hopper
2. Remove all ashes
3. Remove and clean flue pipe
4. Check chimney and clean if necessary
5. Remove hopper and check for rust at bottom edges. If rust
is found, remove it with a file or sandpaper then paint the
area with spray paint available at your Harman® dealer.
Hopper Maintenance:
Always empty the hopper when not burning for more than
a week.
Pusher Block Maintenance:
When left standing for long periods with wet coal, the pusher
block will rust and corrode, causing it to stop. If the stoker is
then turned “on”, damage to the pusher assembly and feed
motor will result. This will be considered neglect and will void
the warranty on those parts. If the unit has not been burned
for a period of time, always check to see if moving parts are
free before using. This can best be determined by shaking
the adjuster rod.
6. Check the feeder for rust and corrosion where the hopper
fits into it.
7. Check pusher block to be sure it moves freely. This can
best be done by shaking the adjuster rod. If it does not
move freely, it should be removed and cleaned. Also
remove any rust or corrosion from the area where the
pusher block slides and spray with WD-40 or other rust
preventing spray. To remove pusher block, remove cover,
wing nut, adjuster and adjuster tube. Remove motor mount
with motor in place and cord still attached. Swing pusher
assembly up as high as it will go. Remove feed indicator
from side with allen wrench. Now the pusher block can be
removed. To reinstall, just reverse procedure. If the pusher
block cannot be removed, call your Harman® dealer.
WARNING- Risk Of Fire;
- DO NOT Operate with flue draft exceeding -.10 in Water
Column (-24.9 Pa.)
- DO NOT operate with fuel loading or ash removal doors
- DO NOT store fuel or other combustiblematerial within
specified installation clearance areas.
- INSPECT and clean chimney flue system and chimney
connectors regularly.
Adjuster Rod
- Inspect flue pipes, joints, and seals regularly to
ensure that smoke and flue gases are not drawing
into the dwelling.
- Cleaning of the heat exchanger, flue pipe, chimney,
and draft inducer if used, is especially important at
the end of the heating season to minimize corrosion
during the summer months caused by accumulated
- DO NOT use chemicals or fluids to start a fire.
-DO NOT burn garbage, gasoline, naptha, engine oil,
or other inappropriate materials.
Feeding Problems
Gas Odor Problems
Wet Coal:
Wet coal does not flow the same as dry coal, therefore; the
feed rate will change with wet coal. If it is too wet, it may not
feed at all. Wet coal can also cause a sulfur odor.
Gas Alarm Goes Off or Sulfur Odor Exists:
A sulfur smell may be noticed when a door is opened during
operation with wet or damp coal. This is normal. However, it
is not recommended that wet coal be used or the doors be
opened for more than a few seconds while burning to inspect
the fire or remove ashes.
Wrong Size Coal:
The Verti-Flow™ System is designed to burn rice coal (or
buckwheat coal if rice is not available). If buckwheat coal is
burned, raise the draft setting from .04 to .06. Larger coal
will not feed or burn properly.
Hopper Blocked:
Sometimes wood, paper, or other foreign objects accidently
end up in your coal bin and can slow down or block the flow of
coal. You may have to empty the hopper to find the blockage.
Pusher Out of Adjustment:
This can happen when more than one person tend the stoker.
One person does not tell the others what adjustments were
Lack of Draft or a Down Draft in the chimney: These will
cause gases to escape from the unit. No unit will function
properly without draft. Any draft problem should be corrected
before use.
A draft inducer may be installed to increase draft in marginal
situations. The installation should be performed by your
dealer who is factory trained to correct any problems on initial
start up. After proper installation, many years of trouble-free
operation can be expected.
Stoker Control Troubleshooting
Problem: No motors or lights will turn on.
1. Check AC power cord to the stoker control
2. Check the 3 amp fuse on the side panel of the stoker
timer. (replace only with a 3 amp 3 ag slow blow fuse.)
Problem: Lights on the stoker control are on, but motors
will not operate.
Solution: Check the AC power plugs from the motors (are
they securely plugged into the correct outlet?)
Problem: One of the motors will not operate.
Solution: Check if the light above the receptacle is lit. Check
the AC power plug from the motor (is it securely plugged
into the correct outlet?”
Problem: The motors are cycling on and off, but not in the
correct order.
Solution: Check the AC power plugs from the motors (are
they securely plugged into the correct outlet?)
Problem: Coal feeder motor will not turn on.
Solution: Check if the red light is lit, if not, check if the feeder
motor switch is turned on.
Problem: The motors turn on and off as programmed, but
the water temperature is below the thermostat setting.
Solution: Check the connections from the stoker control to
the aquastat.
(a350My350, s350)
1. Lay the din rail on a flat surface with the flat side down. Secure one end clamp on the left side.
2. From the right side, slide the A350 control onto the din rail. Slide the control to the left until it is against the end clamp.
3. Repeat Step 2 with the Y350 power module, connecting it to the A350 control. NOTE: Be careful when fastening the
plug-together connecters located at the top of the controls.
4. Repeat Step 3 with the S-350 control, connecting it to the Y350 power module.
5. Install the other end clamp to the right side of the din rail.
6. Remove the covers on the three controls by using the four screws on each control. (A350, Y350, S350)
7. Install the terminal box to the controls by using the three chase nipples and locknuts supplied with the kit.
8. Mount the terminal box with controls to the boiler jacket or any other desired location by the four holes in the terminal box.
9. Using two 8-32 nuts, install the terminal block over the studs located in the terminal box.
10. A350 Control: 1) Set the jumpers to the heat position. They may already be in this position. 2) Set the differential to the
desired set point. 3) Terminate the wires using the common and the normally open terminals.
11. Y350 Control: 1) Terminate the power wiring using the 120 VAC terminals on the control. This will be supplied from the
terminal block located in the terminal box.
12. S350 Control: 1) Set the offset to the desired set point. 2) Set the differential to the desired set point. 3) Set the jumpers
to the cooling position. 4) Terminate the wiring using the common and the normally open terminals.
13. Set the A350 control to the desired water temperature.
14. After locating and installing the sensor well and sensor, wire the sensor to the A350 control. The terminals marked “sen”
and “com” are located in the upper left-hand corner of the A350 control. Make sure the sensor is inserted into the well
fully and secured with a setscrew.
15. Reinstall the covers on the three controls
16.NOTE: Sensor wire can be lengthened up to 50 feet with standard 22 awg t-stat wire. Shielded cable is generally not
required for sensor wiring runs of less than 50 feet. However, if over 50 feet, follow this guide:
14 awg.....................800 feet
16 awg.....................500 feet
18 awg.....................310 feet
20 awg.....................200 feet
22 awg.....................124 feet
Wiring Diagram & Fuel
Approved For Use With Anthracite Rice Coal Only.
Anthracite coal is “hard coal”, mined primarily in the northeast United States. Rice coal, as shown at right, is typically
described as coal having no dimension larger than 3/8”. Other size coal may cause feeding problems, and is therefore not
recommended for use in your VF3000.
It is best to buy your supply of coal when the temperature is above freezing. This is because many dealers put kerosene
or fuel oil on the truck box and calcium on the coal to keep it from freezing while it is being transported. The calcium can
promote rust and the oil may cause an odor depending on what type is used.
It is best and most convenient to have a coal bin inside and close to the boiler. The bin should have drainage to allow the
water to drain.
DO NOT store fuel within the specified clearance area.
Rice Coal
hearth & home technologies
lIMIted lIFetIMe warrantY
Hearth & Home Technologies, on behalf of its hearth brands (”HHT”), extends the following warranty for HHT
gas, wood, pellet, coal and electric hearth appliances that are purchased from an HHT authorized dealer.
warrantY COVerage:
HHT warrants to the original owner of the HHT appliance at the site of installation, and to any transferee taking ownership
of the appliance at the site of installation within two years following the date of original purchase, that the HHT appliance
will be free from defects in materials and workmanship at the time of manufacture. After installation, if covered components manufactured by HHT are found to be defective in materials or workmanship during the applicable warranty period,
HHT will, at its option, repair or replace the covered components. HHT, at its own discretion, may fully discharge all of its
obligations under such warranties by replacing the product itself or refunding the verified purchase price of the product
itself. The maximum amount recoverable under this warranty is limited to the purchase price of the product. This warranty
is subject to conditions, exclusions and limitations as described below.
warrantY PerIOd:
Warranty coverage begins on the date of original purchase. In the case of new home construction, warranty coverage
begins on the date of first occupancy of the dwelling or six months after the sale of the product by an independent,
authorized HHT dealer/ distributor, whichever occurs earlier. The warranty shall commence no later than 24 months
following the date of product shipment from HHT, regardless of the installation or occupancy date. The warranty period for
parts and labor for covered components is produced in the following table.
The term “Limited Lifetime” in the table below is defined as: 20 years from the beginning date of warranty coverage for
gas appliances, and 10 years from the beginning date of warranty coverage for wood, pellet, and coal appliances. These
time periods reflect the minimum expected useful lives of the designated components under normal operating conditions.
Warranty Period
1 Year
2 years
HHT Manufactured Appliances and Venting
3 years
Components Covered
Electric Venting
All parts and material except as
covered by Conditions,
Exclusions, and Limitations
Igniters, electronic components,
and glass
Factory-installed blowers
Molded refractory panels
Firepots and burnpots
5 years
1 year
7 years
3 years
1 year
3 years
90 Days
Castings and baffles
Manifold tubes,
HHT chimney and termination
Burners, logs and refractory
Firebox and heat exchanger
All replacement parts
beyond warranty period
See conditions, exclusions, and limitations on next page.
4021-645F 02-18-13
Page 1 of 2
warrantY COndItIOnS:
This warranty only covers HHT appliances that are purchased through an HHT authorized dealer or distributor. A list of
HHT authorized dealers is available on the HHT branded websites.
This warranty is only valid while the HHT appliance remains at the site of original installation.
This warranty is only valid in the country in which the HHT authorized dealer or distributor that sold the appliance
Contact your installing dealer for warranty service. If the installing dealer is unable to provide necessary parts, contact
the nearest HHT authorized dealer or supplier. Additional service fees may apply if you are seeking warranty service
from a dealer other than the dealer from whom you originally purchased the product.
Check with your dealer in advance for any costs to you when arranging a warranty call. Travel and shipping charges
for parts are not covered by this warranty.
warrantY eXCluSIOnS:
This warranty does not cover the following:
• Changes in surface finishes as a result of normal use. As a heating appliance, some changes in color of interior and
exterior surface finishes may occur. This is not a flaw and is not covered under warranty.
• Damage to printed, plated, or enameled surfaces caused by fingerprints, accidents, misuse, scratches, melted items,
or other external sources and residues left on the plated surfaces from the use of abrasive cleaners or polishes.
• Repair or replacement of parts that are subject to normal wear and tear during the warranty period. These parts
include: paint, wood, pellet and coal gaskets, firebricks, grates, flame guides, batteries and the discoloration of glass.
• Minor expansion, contraction, or movement of certain parts causing noise. These conditions are normal and complaints related to this noise are not covered by this warranty.
• Damages resulting from: (1) failure to install, operate, or maintain the appliance in accordance with the installation
instructions, operating instructions, and listing agent identification label furnished with the appliance; (2) failure to
install the appliance in accordance with local building codes; (3) shipping or improper handling; (4) improper operation, abuse, misuse, continued operation with damaged, corroded or failed components, accident, or improperly/
incorrectly performed repairs; (5) environmental conditions, inadequate ventilation, negative pressure, or drafting
caused by tightly sealed constructions, insufficient make-up air supply, or handling devices such as exhaust fans or
forced air furnaces or other such causes; (6) use of fuels other than those specified in the operating instructions; (7)
installation or use of components not supplied with the appliance or any other components not expressly authorized
and approved by HHT; (8) modification of the appliance not expressly authorized and approved by HHT in writing;
and/or (9) interruptions or fluctuations of electrical power supply to the appliance.
• Non-HHT venting components, hearth components or other accessories used in conjunction with the appliance.
• Any part of a pre-existing fireplace system in which an insert or a decorative gas appliance is installed.
• HHT’s obligation under this warranty does not extend to the appliance’s capability to heat the desired space. Information is provided to assist the consumer and the dealer in selecting the proper appliance for the application. Consideration must be given to appliance location and configuration, environmental conditions, insulation and air tightness of
the structure.
this warranty is void if:
The appliance has been over-fired or operated in atmospheres contaminated by chlorine, fluorine, or other damaging
chemicals. Over-firing can be identified by, but not limited to, warped plates or tubes, rust colored cast iron, bubbling,
cracking and discoloration of steel or enamel finishes.
The appliance is subjected to prolonged periods of dampness or condensation.
There is any damage to the appliance or other components due to water or weather damage which is the result of, but
not limited to, improper chimney or venting installation.
The owner’s exclusive remedy and HHT’s sole obligation under this warranty, under any other warranty, express or
implied, or in contract, tort or otherwise, shall be limited to replacement, repair, or refund, as specified above. In no
event will HHT be liable for any incidental or consequential damages caused by defects in the appliance. Some states
do not allow exclusions or limitation of incidental or consequential damages, so these limitations may not apply to you.
This warranty gives you specific rights; you may also have other rights, which vary from state to state. EXCEPT TO
4021-645F 02-18-13
Page 2 of 2
Date Of Service
Service & Maintenance Log
Performed By
Description Of Service
At Harman®, we build each product to a standard, not a price.
(Signature of Boxer)
Your premium quality hearth product designed and assembled
by the experienced and skilled members at Harman® in
Halifax, PA, USA.
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