Yunca Heating HOBSON Manuale operativo

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

sales@yunca.co.nz

www.yunca.co.nz

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