Yunca Heating HOBSON Operating manual

Yunca Heating Solid Fuel Maintenance Guide April 2010
Yunca Woodburners and Multifuels feature
very similar basic designs throughout the
range, so when it comes to maintaining
your fire the same procedures may be
followed for different models.
To assist with identifying fires and associated
spare parts, please refer to the online spare
parts (woodburner, multifuel) guide:
http://www.yunca.co.nz/Instructions/index.htm
Yunca recommends you regularly check your
burner to ensure optimum performance. To
save on maintenance costs there are a
number of procedures that, with due care and
attention, can be carried out by the owner.
This includes the following:
-replacing the glass / glass seal
-replacing the door rope / ash door rope.
-replacing the door handle / door handle
shaft
-replacing firebricks / combustion plates / air
tubes
The following is a guideline to assist with
some of these tasks.
Remember that your safety is paramount, so if
there is any doubt please contact your local
Yunca agent or a service firm (maintenance
may also be carried out by the same firm that
offers chimney cleaning, for example).
Yunca recommends that the flue system is
checked and cleaned annually.
1. REPLACING THE GLASS,
GLASS SEAL and DOOR ROPE
Glass may be cleaned by dipping a damp paper
towel in ash and wiping the cold glass. Buff with a
clean, damp paper towel. Glass may blacken
when a fire is turned down, and this will normally
burn off when next operating at a higher
temperature.
If there is a very sticky, dark deposit on the glass
this is creosote, caused by burning wet wood or
not having enough heat in the fire bed before
turning the fire down. Creosote may be difficult to
remove. Avoid scratching the glass. Avoid harsh
chemicals or the glass may become pitted. Should
you use ANY cleaner on the glass, you must rinse
well before use.
Avoid creosote build up by ensuring your firewood
is well seasoned. Creosote can also cause
chimney blockages.
N.B. When door / ash door rope has been
replaced it will be necessary to adjust the door
handle shaft (where fitted). Refer to section 2.
1A. “NEW MODEL” MULTIFUEL FIRES
(FREESTANDING & INBUILT), HOBSON,
FITZROY, QEWB (except QEWB2000),
and QEWB VARIANTS (FOCUS,
RADIANT, etc).
(Wegj and Blenz: Refer 1B, 1C).
You may leave the door frame in place on the
fire when changing glass, glass seals and
ropes. It is not advisable to reuse old glass seal
as it may not give an adequate seal and it will
be very difficult to fit without adhesive.
A GUIDE TO MAINTAINING YOUR
YUNCA SOLID FUEL BURNER

Yunca Heating Solid Fuel Maintenance Guide April 2010
REPLACING THE GLASS, GLASS SEAL AND
DOOR ROPE
– 1A. MULTI, HOBSON, FITZROY, QEWB, etc
continued.
When carrying out this work it pays to have
something soft on the hearth (like an old
pillow), just in case.
Remove the door handle.
Door glass is “sandwiched” between the cast
frame and the door panel.
Access the glass by carefully removing the door
rope to expose four screws in the channelling.
When these screws are undone the glass will
drop, so please take care here and hold the
glass in place.
Remove the glass and the door panel.
Fit new seal (black ladder tape) to the glass (if
existing glass is being reused, clean the glass
first). Start away from the corner, take care
NOT to stretch the new seal. It is recommended
that only a small amount of the backing tape is
removed from the seal at one time – the seal is
very, very sticky. The centre of the seal runs
along the glass edge and then, when you are
happy that the tape fits well, it is pressed down
over each side. Allow a small overlap as over
time the seal can shrink.
Place the glass between the door panel and
the casting (there is a recess on the front of the
casting that the glass fits into). Take care when
doing up the screws as incorrect pressure may
crack the glass. Lightly tighten the screws,
bottom ones first, just enough to stop the glass
slipping, then the top ones. Make sure the glass
and door panel are straight, then begin
tightening the screws until fitting firmly, a little at
a time, working your way diagonally around the
door (similar to when you need to change the
tyre on your car).
If door rope is in good condition it may be
reused. Always install the rope as one piece (do
not cut it into sections). When putting new
ropes in, you may find the rope is a bit stiff. You
can “work” it to soften it up, just make sure you
don’t twist the rope in the channel. Start hard
into a corner, and try not to pull on the rope
when putting it in as this will stretch it. Pinching
the rope as you place it in the channel may
make it easier to fit. As you complete each side,
go back over that section and gently tap the
rope in (otherwise it may pull out while you are
trying to place the next section).
If you find the rope is too long (a small amount
left over is ok, more than 15mm needs
trimming) this MAY mean the rope has been
stretched, try removing the rope and refitting it.
If only a small amount left over try and squeeze
it in, but if that is not possible it is ok to trim it.
The ends of the rope are taped is to stop it
fraying. Place a piece of tape (sellotape is fine)
around the rope, and cut just past the tape. Cut
the rope slightly longer than needed to give a
good air tight seal.
The door handle shaft will need to be adjusted
(see 2 below) to allow for the newness of the
rope. Check the door after a couple of fires in
case you need to adjust the door shaft again as
the rope will have bedded in.
1B. WEGJ SERIES
Remove the door from the fire. The Wegj
door is fitted in the same way as an oven door,
lift up and out, however please be careful near
the hinges as the springs cause them to retract
and may trap fingers (yes, it can bite!). Open
the door slightly, grip near the bottom of the
door then lift the door up and away from the
fire.
Remove the screws. Lay the door, hinge side
(inside) facing downwards, on a firm surface
that will not scratch the enamel coating or the
glass. There are six screws (three on each of
the long edge) holding the door components
together. Remove all of these screws and
gently but firmly lift up the front section of the
door panel. The glass and its seal can now be
seen, pick the glass up carefully, remove the
old glass seal, clean the glass – if required.
Attach the glass seal to the glass as described
in 1A above.
This is a good time to check the springs and
door mechanism. Replace where required.
Refer to the online spare parts guide for details.
Return the glass to the retainers on the inner
door panel, replace the outer door panel, and
screw the panels back together when you are
sure everything is correctly aligned.
Refit the door to the fire (the springs on the
hinges may be tight and can easily pinch if care
is not taken when putting the door back on the
fire). This job is made easier if the hinge arms
are held open (screwdrivers can be used to
prevent the springs retracting) while
manoeuvring the door back into place.

Yunca Heating Solid Fuel Maintenance Guide April 2010
Changing the Wegj door rope is simple.
Remove old rope from the retainer attached to
the front of the fire box opening and insert a
new rope.
1C. BLENZ
You may leave the door frame in place on the
fire when changing glass, glass seals and
ropes. It is not advisable to reuse old glass seal
as it may not give an adequate seal and it will
be very difficult to fit without adhesive.
When carrying out this work it pays to have
something soft on the hearth (like an old
pillow), just in case.
Remove the screws attaching the door rope
retainer to the door casting, the door rope will
stay in the retainer unless it is also needs to be
changed. Remove the glass (if you have
difficulty you may find it easier to also remove
the door handle and undo the lock-nut to allow
the shaft to be extended. Attach the glass seal
to the glass as described in 1A above. Refit the
glass and attach the retainer to the door, taking
care to align the door panel correctly – the door
should openly freely and the panel needs to be
straight.
If the door rope needs to be changed do so (it
fits very easily into the channel on the retainer).
Adjust the door handle shaft (see below).
2. DOOR HANDLES and DOOR
HANDLE SHAFTS.
With the exception of the Wegj and the ash doors
(see 2B) of some models, Yunca fires use the
same door handle. The handle is fitted with a
single screw to the shaft.
Door handle shafts can be adjusted to ensure a
better fit. There are slight design differences for
some models (refer to our online spare parts
information)
http://www.yunca.co.nz/Instructions/index.htm
however the instructions are basically the same.
Always shut a fire door gently as sometimes fuel
may not be fully in the firebox and this may cause
the glass to break.
2A. ALL FIRES (except Wegj).
To open the door, turn the handle up (anti
clockwise) to the “12 o’clock” position and open
the door. To close the door, start with the
handle at 12 o’clock, push the door closed, and
turn the handle down to about the “4 o’clock”
position.
DO NOT FORCE THE HANDLE to close the
door (or handle may break). If the door is too
difficult to close, try adjusting the door handle
shaft. Similarly if the door handle turns too
easily (past the “five o’clock position, for
example), then the shaft needs to be adjusted.
DO NOT LEAVE THE DOOR HANDLE in
position over the glass.
There is an easy test to check if your fire door
or ash door is sealing fully.
ONLY TRY THIS IF THE FIRE IS COLD (NOT
going, NO hot or warm embers).
A sheet of paper is placed half in, half out of the
top of the door, and the door is then closed. If
the paper pulls out without tearing, then it is
likely the door handle shaft needs adjusting, or
the door rope may need replacing.
Adjust the shaft by loosening the locking nut,
then wind the brass bush in (to tighten) or out
(to loosen or remove). Once adjusted, close the
door and check it - too loose and the door
handle will likely be able to keep turning in a full
circle and lack of a tight seal will allow too much
air in, too tight and you risk breaking the
handle. When satisfied that the door is closing
correctly, tighten the locking nut. The rope will
bed in a little, so it is recommended that the
door closure be rechecked after a few fires.
2B. WEGJ DOOR, also BLENZ ASH
DOOR and all QEWB MULTI SERIES
ASH DOOR
Each door handle is fixed by a single screw to
the shaft. A plug (0300P) is available to fit into
the open end at the side of the handle once it
has been fitted.
Should you need to replace the springs
(0222W) in a Wegj door it is recommended
that BOTH be changed at the same time to
provide even tension. Access by removing the
door from the fire and follow instructions in 1B
(above). You will find it easier to replace the
glass seal with a new one at this time, rather
than struggle to refit the existing seal.
If there is difficulty closing the ash door (Blenz,
Qewb MF series) try adjusting the catch pin
(0215BQM).

Yunca Heating Solid Fuel Maintenance Guide April 2010
3. FIREBRICKS, COMBUSTION
PLATES, AIR TUBES.
With the exception of the “new model” style multi
(freestanding and inbuilt), all Yunca fires feature a
40mm firebrick (1605) – three or four down each
side and four or five across the back - to protect
your firebox. In some models these fit snugly, in
others there may be a small gap between bricks.
Grip the brick at the base, lift slightly and pull
forward to remove.
3A. HOBSON, FITZROY, QEWB SERIES
and VARIANTS.
The firebricks support a solid combustion plate
(1606Q).
Woodburners feature a round air tube (1607,
1607C) fitted at the front of the combustion
plate (one end of the tube goes through a hole
in the right side of the firebox, and the other end
hooks over the angle piece on the left of the
combustion plate). It may be easier to fit the
round air tube when the front, right fire brick is
removed.
CLEAN AIR versions of the HOBSON and
FITZROY have a SQUARE air tube (1607HSC)
fitted, it sits on top of the bricks, under the
combustion plate.
3B. BLENZ (also EXCEL, FINZ)
Three different types for these models:
- no air tube
- a single air tube
- a double round air tube.
In the case of all models there are four fire
bricks (1605) placed inside the frame, which is
supported by the side bricks. Bricks within the
combustion frame can be replaced with the
frame in-situ, slightly angle the brick up and into
place. N.B. Older models had a solid metal
plate, these are now replaced with the frame
and fire bricks.
When replacing the frame remove bricks and
any air tube from inside the frame first. Then
remove side bricks to enable the empty frame
to be removed from the firebox. Ensure the
firebox is emptied of all bricks to give room to
manoeuvre. Place the replacement frame inside
the firebox, support the corners first, and then
place side and back bricks. Finally, place bricks
into the top of the frame and fit any air tube. It
may be easier to fit the round air tube when the
front, right fire brick is removed.
3C. WEGJ 2000
Five fire bricks (1605) are placed inside the
frame. It may be difficult to replace bricks in
clean air models because there is less room
above the frame, however by “stacking” one
brick on top of another, and pushing them to the
side, there may be enough room to manoeuvre
new bricks into place.
A round air tube (1607W2R, 1607W2RC) is
fitted at the front of the combustion plate frame
(one end of the tube goes through a hole in the
left side of the firebox, and the other end
against the angle piece on the right of the
combustion plate). It may be easier to fit the
round air tube when the front, left fire brick is
removed.
CLEAN AIR versions have a SQUARE air tube
(1607W2S) fitted, it sits on top of the bricks,
under the combustion plate.
N.B. The “original” Wegj has a steel drum firebox, please
refer to our spare parts guide or the manufacturer for
guidance.
3D. “NEW MODEL” MULTI
(FREESTANDING and INBUILT)
These models use castings rather than bricks,
although after use they may not look it!
Replace castings that are worn / warped (they
lift out). When cleaning the fire ensure you
remove the back and rear castings from time to
time as ash will deposit behind these parts and
put pressure on other parts (such as the grate)
causing them to warp.
The combustion plate (1606M) is solid with
bars at the front and back, and a cut out either
side. The bars are different widths, the smaller
bar faces to the front of the fire.
A half moon casting (1207M) is bolted to the
underside of the ledge that supports the
combustion plate at the top of the firebox. The
straight edge of this part faces the front of the
firebox. To fit – first remove the combustion
plate to allow access above. Hold the casting in
place, insert the bolts up from underneath and
reach up through the gap to secure with the
nuts provided.
YUNCA HEATING
41 ONSLOW ST, PO Box 932,
INVERCARGILL
Ph 03 216 6626
[e-mail]
www.yunca.co.nz