STUV 21-75-DF is a multi-fuel stove that can burn wood, coal, or peat. It has a large viewing window that provides a clear view of the fire, and it is equipped with a number of features that make it easy to use and maintain.
The STUV 21-75-DF has a built-in fan that helps to circulate warm air throughout the room, and it is also equipped with a thermostat that allows you to control the temperature of the room. The stove is made of high-quality materials, and it is designed to last for many years.
Here are some of the possible use cases for the STUV 21-75-DF:
- Heating a single room or a small home
STUV 21-75-DF is a multi-fuel stove that can burn wood, coal, or peat. It has a large viewing window that provides a clear view of the fire, and it is equipped with a number of features that make it easy to use and maintain.
The STUV 21-75-DF has a built-in fan that helps to circulate warm air throughout the room, and it is also equipped with a thermostat that allows you to control the temperature of the room. The stove is made of high-quality materials, and it is designed to last for many years.
Here are some of the possible use cases for the STUV 21-75-DF:
- Heating a single room or a small home
maintenance
S 21 maint. en 02-06
Replacing pulleys, upper pressure roller and counterweight cables 3-4
Replacing the door seal, the window, and the door runners 5-8
Replacing the door 9-11
Replacing the compensating springs 11
Replacing the lower seal 12
Replacing the door catch spring 12-13
Replacing the lower pressure roller 13
Replacing the refractories 14
Working on the ventilation unit 15
List of spare parts 16-18
from serial nr. 00020432
S21 maint. en
02-06
2
Maintenance requires a variety of tools
- two flat screwdrivers of different
sizes
- a chain about 1 m long
- a 2.5 Allen key (M4)
- a 3 Allen key (M5)
- open-end spanners : 7, 8, and 12
- a high-temperature lubricant
Some operations differ according to
the serial number. This number is vis-
ible on the upper right front, on the
return.
S21 maint. en
02-06
3
78
7 The parts that make up the pulley.
Make sure to centre parts A, B and
C properly when reassembling.
8 Do not hesitate to lubricate the
pulley. Use “high-temperature”
lubricant.
6 Using the 12 mm open-end span-
ner and a 3 Allen key, unscrew the
pulley from the bracket.
6
4 Lower the bracket 10 cm. 5 Pivot the bracket 45° and lower it
until it is completely free.
45
Pulleys maintenance
1 2
1 Tilt the door. Unhook the cable. 2 To avoid "losing" the cable in the
convection chamber, attach it to
the chain. Let the counterweight
down.
3 Using the 3 Allen key, unscrew the
2 screws that hold the bracket in
place. When a screw is seized-up,
do not force as this will damage its
head : it will un-seize with a ham-
mer blow in line with the screw-
driver.
3
Replacing pulleys, upper pressure roller and counterweight cables
Disassembly
A
B
C
S21 maint. en
02-06
4
13 14
13 The cable's connection to the
counterweight is accessible.
14 Close-up of connection (A) and
“standby” position (B).
10 11
10 Components of upper pressure
roller.
11 Refit in the reverse order.
When reassembling, make sure
the cable is running in the pulley
and runs on the right side of the
pressure roller.
12 To replace cable, proceed in the
same way as for removing the pul-
ley bracket.
12
B
A
9
9 Using a 12 mm open-end spanner
and a 3 Allen key, undo the upper
pressure roller.
Upper pressure roller's maintenance
Replacing counterweight cables
A
S21 maint. en
02-06
5
6
6 Unhook the cables from the door.
4 Using a flat screwdriver, release the
end of the seal by opening the seal
clamps.
4
5 Remove seal from its groove by
lifting its end.
56
1
1 Tilt the door by 20° and slightly
slide the door upwards (± 6cm).
2
2 Undo the two cruciform screws
from the seal groove.
3
3 Completely tilt the door.
1. Disassembly
7 Re-attach them in "standby"
mode.
7
8 Using the 8 mm open-end span-
ner, unscrew the damper cover
plate.
8
9 Close the door, remove the damp
cover plate.
9
Replacing the door seal, the window, or the door runners
Door seal : photos 1 to 5 and 25 to 35
Window : photos 1 to 13 and 20 to 35 except 25 and 26
Door runners : photos 1 to 35 except 25 and 26
S21 maint. en
02-06
6
10
10 Using the cold handgrip, remove
the keys, releasing the compensa-
tion springs.
11 Use a support to rest tilted door.
Using the cold handgrip, tilt the
door. Protect the paint on the
door edge.
11
12 Unscrew and remove
the stainless-steel.
12
Warning : The weight of the door is
no longer offset by the springs, so the
door could swing heavily and cause
damage !
16 Move the intermediary sliding
mechanism of the runner, allowing
access to the 4 screws (3 screws in
the Stûv 21/75).
16
17 Remove the damaged runner.
17
13 Remove the (damaged) window.
13
14 Using the 2.5 Allen key, remove
the two countersunk head screws
M4 on each side.
14
15 Remove sliding door.
15
S21 maint. en
02-06
7
21 Re-attach the cables to the door.
21
22 Close the door, replace the two
compensation spring keys.
22
left key
right key
23
23 Replace the damper cover plate.
24
24 Open the door. Using the 8 mm
open-end spanner, tighten the
damper cover plate.
25
25 To replace the seal, remove it by
sliding it out of its groove. Spot
groove side with its two perfo-
rated ledges. They will have to be
positioned face-up.
26
26 Slide the new seal in the groove
with an even length on both sides.
Leave more slack for the top part.
20 Re(place) the window (check that
the Stûv logo is in the right posi-
tion). Tighten the stainless-steel
clamps.
20
19
19 Screw the runner back on. Make
sure it is fitted with the 7 holes
towards the top. Screw back the
two screws on each side of the
sliding door.
2. Reassembly
18 To reassemble, reverse the proce-
dure. Realign the stay bar.
18
S21 maint. en
02-06
8
27
27 Insert the extremities of the two
legs of the armature in the orifices
at the bottom of the door, mak-
ing sure you have the two ledges
towards the top.
28 Fit the seal into the door groove.
28
32
32 Check that the screws went
through the armature orifices
by feeling the seal.
31
30 Fit the armature using 2 Parker
screws running through the seal.
33 Adjust the extremities of the seal
by pulling it to the edge of the
window.
33
29 Slightly lift the door (45°) and pull
out the runner 10 cm.
2 9
34
34 Fold back the pointed tongue on
the seal with a screwdriver.
30
31 Do not tighten too hard so that
the seal does not lift in the angles.
35
35 Make sure the point sets well into
the seal.
A B
S21 maint. en
02-06
9
1 2
1 Using the cold handgrip, tilt the
door. Leave the cold handgrip in
the opening lug, in order to pre-
vent the door from sliding !
2 Unhook the cables from the door. 3 Re-attach them in "standby"
mode.
4 Using the 8 open-end spanner,
unscrew the damper cover plate.
4
5 Close the door and remove the
damper cover plate.
5
6 Remove the secondary air damper.
6
7 Remove the primary air damper.
Close the door.
9 You can access the M 5 screws.
Using the 8 mm spanner, unscrew
these screws.
8 Using the cold handgrip, remove
the keys, releasing the compensa-
tion springs.
7 8 9
Replacing the door
1. Taking the door apart
3
S21 maint. en
02-06
10
10 & 11 Tilt the door while holding it firmly. Remove the whole
door-and-hinges unit.
10 11
1
1 Replace the door-and-hinges unit. 2 Close the door. With an 8 mm
spanner, tighten the M 5 nuts.
2
left key
right key
3
3 Replace the two compensation
spring keys.
4
4 Open the door. Replace the two
dampers.
5 Place the cover plate in position.
5
2. Reassembling the door
6 Using the 8 mm open-end span-
ner, tighten the screws on the
damper cover plate.
6
Warning : the weight of the door is no
longer offset by the springs, so the
door could swing heavily and cause
damage !
S21 maint. en
02-06
11
Replacing the compensating springs
2
2 Uncover the springs. Using a
screwdriver, release the springs.
3 Using a flat screwdriver and an
8 open-end spanner, remove the
spring pin.
3
1
1 Take the door apart (see pages
9 and 10). Put the door down
with the external surface facing
upwards.
4
4 Replace the springs. Check the
direction of the springs (fig. 5) :
the large hooks should be attached
to the pin. Replace the door (see
page 10).
7 Replace the 2 cables on the sliding
parts. Close the door.
7
5
side view
S21 maint. en
02-06
12
Replacing the lower seal
4
4 Undo the curved-head M 5 screws
of about 5 turns.
1
1 Tilt the door. Using the 8 mm
open-ended spanner, undo the
dampers cover plates (photo 8 p.5)
5 Remove the seal.
5
1
1 Tilt the door.
Replacing the door catch spring
2
2 Press the catch and remove the
split pin.
3 Remove the catch and the spring.
3
2 Close the door and remove cover
plates and dampers.
2
3 Tilt the door and set cables in
“standby” position.
3
6 Insert the seal, adjust its position,
and tighten the M 5 screws.
6
A
B
S21 maint. en
02-06
13
4
4 Fit a new spring and refit
the catch.
5 Using a flat screwdriver, clear a
passage for the split pin and slide
it in the hole.
56
6 Push the split pin until its safety
position.
Replacing the lower pressure roller
4 Slide the glass towards oneself
while supporting it until it reaches
the end of runners.
4
1 Tilt the door.
1
2 Unhook the cables from the door.
2
3 Re-attach them in "standby"
mode.
3
5 Unscrew the damaged catch
(12 mm spanner) and replace
parts while taking care not to
damage glass.
5 6
6 Components of the catch.
A
S21 maint. en
02-06
14
Remove the damaged refractory stones.
Check the position of the primary air diffuser (photo 1 page 15 fig. A).
Placing the refractories :
- Make sure you always position the chamfer towards the interior
of the fireplace,
- Follow the sequence set out in figures 1 à 6" (depending on the model of fire-
place being lined).
Replacing the refractories
1
21/75, 21/85,
21/95
2
21/105, 21/125
A
1
2
3
4
5
6
8
7
9
10
12
11
6
21/75 & 21/85 DF
For models 21/45, 21/65C, 21/65H,
21/75, 21/85 et 21/95 single-sided :
- Lining the bottom : place the rebat-
ed refractories towards the back
(to receive the back refractories)
- Place the side refractories as far
forward as possible (with the rebate
towards the front of the fireplace),
so as to be able to fit the refracto-
ries lining the back,
- Place the back ones as far to the
outside as possible, and then centre
them,
- Finally, push the side refractories
towards the back (to hold in place
the refractories lining the back).
21/105, 21/125 single-sided :
- The same procedure applies to the
other single-sided models, but the
4 refractories without rebates go in
the centre of the rear wall.
- For levels 2, 3, and 4, place the
respective locking pieces in front
of refractories nos. 16, 21, and 26.
For the double-sided models :
- 21/75 & 21/85 DF : centre all
refractor plates.
- 21/95 DF (fig.6') : fit refractors
1 & 5, then 2, 3 & 4 and finish
with sides.
- 21/125 DF (fig.6") : fit refractors
1, 2, 6 & 7, then 3, 4 & 5 and
finish with sides.
6'
21/95 DF
6"
21/125 DF
4
21/65H
5
21/65C
3
21/45
S21 maint. en
02-06
15
3
3 Unscrew and remove the ventila-
tor. To reassemble, do the same
in reverse order. Be careful : for
the single-sided models, there is
a correct direction for the floor of
the fireplace. For positioning the
refractories, see page 14.
2
2 Unscrew and remove the floor of
the fireplace.
Working on the ventilation unit
Do not forget to switch off the current before maintenance !
1 Place some protective material (for
example, a blanket) on the edge of
the fireplace, Take out the refracto-
ries and the primary air diffuser.
1
A
S21 maint. en
02-06
16
List of spare parts Page reference Part reference
for all the Stûv 21...
paint spray MA010
Handling handle 21 (cold handgrip) page 5 photo 1 21MAIN2
runner Accuride GC 2726-0045 page 6 photo 17 MA090
speed variator, built-in or visible VENT01322
fan 600 m3page 15 photo 3 VENT300
fan 200 m3VENT200
door knob 21 (MA17071) + M 6 screws (QUI0060612) SAV21KBPOR2
Guitel pulley model 21 page 3 photo 7 A MA009
corrugated washers pulley braking page 3 photo 7 B MA030
pulley backing washer 21 page 3 photo 7 C 21RONDRESS
closure kit :
catch (P870), spring (MA036) split pin (QUI05125)
page 12 photo 3 SAV21KFERM2
lower bronze pressure roller page 13 photo 6 A MA1906
upper pressure roller page 4 photo 10 A MA0172
magnet kit :
magnet (MA050), spring (MA034) & screws (QUI00840312)
page 8 photo 33 SAV21AIMANT
for the Stûv 21/45 SF (single-sided)...
counterweight support cable 21/45 (L : 1424 mm) page 4 photo 13 MA0914
damper cover plate (3 sides) 21/45 page 5 photo 9 SAV2145P610
primary air deflector 21/45 page 15 photo 1 SAV2145P170
silicone seal THT black (MA0069) 21/45 (L : 290 mm) page 12 photo 6 A SAV2145JSI
clamp for silicone seal + protective cover (PCE 690-700)
21/45
page 12 photo 6 B SAV2145KPRINOX
door seal black (MA006404) 21/45 (L : 1920 mm)
for armature
page 7 photo 26 SAV2145JPO2
armature for door seal 21/45 page 7 photo 25 MA00555
seal pliers kit 21/45 (PCES 710-720-730) for armature page 6 photo 12 SAV2145KPJINOX2
window kit 21/45 + seal (MA006402) page 7 photo 20 SAV2145KVITRE
refractory Stûv 21/45 SF page 14 photo 3 REFR2145SF
vermiculite deflector 21/45 SF page 14 photo 3 2145SFDEV
for the Stûv 21/65C SF (single-sided)...
counterweight support cable 21/65C & 21/75 (L : 941 mm) page 4 photo 13 MA0911
damper cover plate (3 sides) 21/65C & 21/65H page 5 photo 9 SAV2165P610
primary air deflector 21/65C & 21/65H page 15 photo 1 SAV2165P170
silicone seal THT black (MA0069) 21/65C & 21/65H
(L : 490 mm)
page 12 photo 6 A SAV2165JSI
clamp for silicone seal + protective cover
(PCE 690-700) 21/65C & 21/65H
page 12 photo 6 B SAV2165KPRINOX
door seal black (MA006404) 21/65C (L : 1560 mm)
for armature
page 7 photo 26 SAV2165CJPO2
armature for door seal 21/65C page 7 photo 25 MA00556
seal pliers kit 21/65C (PCES 710-720-730) for armature page 6 photo 12 SAV2165CKPJINOX2
window kit 21/65C + seal (MA006402) page 7 photo 20 SAV2165CKVITRE
refractory Stûv 21/65C SF page 14 photo 4 REFR2165CSF
S21 maint. en
02-06
17
List of spare parts Page reference Part reference
for the Stûv 21/65H SF (single-sided)...
counterweight support cable 21/65H & 21/95
(L : 1160 mm)
page 4 photo 13 MA0913
damper cover plate (3 sides) 21/65C & 21/65H page 5 photo 1 SAV2165P610
primary air deflector 21/65C & 21/65H page 15 photo 1 SAV2165P170
silicone seal THT black (MA0069) 21/65C & 21/65H
(L : 490 mm)
page 12 photo 6 A SAV2165JSI
clamp for silicone seal + protective cover
(PCE 690-700) 21/65C & 21/65H
page 12 photo 6 B SAV2165KPRINOX
door seal black (MA006404) 21/65H (L : 1850 mm)
for armature
page 7 photo 26 SAV2165HJPO2
armature for door seal 21/65H page 7 photo 25 MA00557
seal pliers kit 21/65H (PCES 710-720-730) for armature page 6 photo 12 SAV2165HKPJINOX2
window kit 21/65H + seal (MA006402) page 7 photo 20 SAV2165HKVITRE
refractory Stûv 21/65H SF short (= réfractaire 21/65C SF) page 14 photo 5 REFR2165CSF
refractory Stûv 2165H SF page 14 photo 5 REFR2165HSF
for the Stûv 21/75 SF (single-sided) & DF (double-sided)...
counterweight support cable 21/65C & 21/75 (L : 941 mm) page 4 photo 13 MA0911
damper cover plate (3 sides) 21/75 page 5 photo 1 SAV2175P610
primary air deflector 21/75 page 15 photo 1 SAV2175P170
silicone seal THT black (MA0069) 21/75 (L : 590 mm) page 12 photo 6 A SAV2175JSI
clamp for silicone seal + protective cover (PCE 690-700)
21/75
page 12 photo 6 B SAV2175KPRINOX
door seal black (MA006404) 21/75 (L : 1630 mm)
for armature
page 7 photo 26 SAV2175JPO2
armature for door seal 21/75 page 7 photo 25 MA00551
seal pliers kit 21/75 (PCES 710-720-730) for armature page 6 photo 12 SAV2175KPJINOX
window kit 21/75 + seal (MA006402) page 7 photo 20 SAV2175KVITRE
refractory Stûv 21/75 SF page 14 photo 1 REFR2175SF
refractory Stûv 21/75 DF page 14 photo 6 REFR2175DF
for the Stûv 21/85 SF (single-sided) & DF (double-sided)...
counterweight support cable 21/85 & 21/125 (L : 1050 mm) page 4 photo 13 MA0912
damper cover plate (3 sides) 21/85 page 5 photo 1 SAV2185P610
primary air deflector 21/85 page 15 photo 1 SAV2185P170
silicone seal THT black (MA0069) 21/85 (L : 690 mm) page 12 photo 6 A SAV2185JSI
clamp for silicone seal + protective cover (PCE 690-700)
21/85
page 12 photo 6 B SAV2185KPRINOX
door seal black (MA006404) 21/85 (L : 1890 mm)
for armature
page 7 photo 26 SAV2185JPO2
armature for door seal 21/85 page 7 photo 25 MA00552
seal pliers kit 21/85 (PCES 710-720-730) for armature page 6 photo 12 SAV2185KPJINOX2
window kit 21/85 + seal (MA006402) page 7 photo 20 SAV2185KVITRE
refractory Stûv 21/85 SF page 14 photo 1 REFR2185SF
refractory Stûv 21/85 DF page 14 photo 6 REFR2185DF
S21 maint. en
02-06
18
List of spare parts Page reference Part reference
for the Stûv 21/95 SF (single-sided) & DF (double-sided)...
counterweight support cable 21/65H & 21/95 (L : 1160 mm) page 4 photo 13 MA0913
damper cover plate (3 sides) 21/95 page 5 photo 1 SAV2195P610
primary air deflector 21/95 page 15 photo 1 SAV2195P170
silicone seal THT black (MA0069) 21/95 (L : 790 mm) page 12 photo 6 A SAV2195JSI
clamp for silicone seal+protective cover (PCE 690-700)
21/95
page 12 photo 6 B SAV2195KPRINOX
door seal black (MA006404) 21/95 (L : 2150 mm)
for armature
page 7 photo 26 SAV2195JPO2
armature for door seal 21/95 page 7 photo 25 MA00553
seal pliers kit 21/95 (PCES 710-720-730) for armature page 6 photo 12 SAV2195KPJINOX2
window kit 21/95 + seal (MA006402) page 7 photo 20 SAV2195KVITRE
refractory Stûv 21/95 SF page 14 photo 1 REFR2195SF
refractory Stûv 21/95 DF narrow (= refractory 21/75 DF) page 14 photo 6' REFR2175DF
refractory Stûv 21/95 DF wide (= refractory 21/85 DF) page 14 photo 6' REFR2185DF
for the Stûv 21/105 SF (single-sided)...
counterweight support cable 21/105 (L : 975 mm) page 4 photo 13 MA0915
damper cover plate (3 sides) 21/105 page 5 photo 1 SAV211105P610
primary air deflector 21/105 page 15 photo 1 SAV21105P170
silicone seal THT black (MA0069) 21/105 (L : 890 mm) page 12 photo 6 A SAV21105JSI
clamp for silicone seal+protective cover (PCE 690-700)
21/105
page 12 photo 6 B SAV21105KPRINOX
door seal black (MA006404) 21/105 (L : 1820 mm)
for armature
page 7 photo 26 SAV21105JPO2
armature for door seal 21/105 page 7 photo 25 MA00558
seal pliers kit 21/105 (PCES 710-720-730) for armature page 6 photo 12 SAV21105KPJINOX2
window kit 21/105 + seal (MA006402) page 7 photo 20 SAV21105KVITRE
refractory Stûv 21/105 SF (= refractory 21/75 SF) page 14 photo 2 REFR2175SF
refractory Stûv 21/105 SF “center” page 14 photo 2 REFR21105SFCEN
refractory key Stûv 21/105 SF & 21/125 SF page 14 photo 2 A REFR21125SFCLEF
for the Stûv 21/125 SF (single-sided) & DF (double-sided)...
counterweight support cable 21/85 & 21/125 (L : 1050 mm) page 4 photo 13 MA0912
damper cover plate (3 sides) 21/125 page 5 photo 1 SAV21125P610
primary air deflector 21/125 page 15 photo 1 SAV21125P170
silicone seal THT black (MA0069) 21/125 (L : 1090 mm) page 12 photo 6 A SAV21125JSI
clamp for silicone seal + protective cover (PCE 690-700)
21/125
page 12 photo 6 B SAV21125KPRINOX
door seal black (MA006404) 21/125 (L : 2290 mm)
for armature
page 7 photo 26 SAV21125JPO2
armature for door seal 21/125 page 7 photo 25 MA00554
seal pliers kit 21/125 (PCES 710-720-730) for armature page 6 photo 12 SAV21125KPJINOX2
window kit 21/125 + seal (MA006402) page 7 photo 20 SAV21125KVITRE
refractory Stûv 21/125 SF page 14 photo 2 REFR21125SF
refractory Stûv 21/125 SF “center” page 14 photo 2 REFR21125SFCEN
refractory key Stûv 21/105 SF & 21/125 SF page 15 photo 2 A REFR21125SFCLEF
refractory Stûv 21/125 DF narrow (= refractory 21/75 DF) page 14 photo 6'' REFR2175DF
refractory Stûv 21/125 DF wide (= refractory 21/85 DF) page 14 photo 6'' REFR2185DF
S21 maint. en
02-06
19
Take care !
As Stûv fireplaces are constantly
developing, do not forget to indicate
the fireplace production number when
you are ordering spare parts.
That way, you are certain of obtaining
the right part for your fireplace.
Concept & Forme sa - rue Jules Borbouse 4 - B-5170 Bois-de-Villers (Belgium)
tél : +32 (0)81 43 47 96 - fax : +32 (0)81 43 48 74
info@stuv.be - www.stuv.be
Printed on 100% recycled paper - Stûv reserves the right to implement modifications without notice.
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STUV 21-75-DF Maintenance Manual
- Type
- Maintenance Manual
- This manual is also suitable for
STUV 21-75-DF is a multi-fuel stove that can burn wood, coal, or peat. It has a large viewing window that provides a clear view of the fire, and it is equipped with a number of features that make it easy to use and maintain.
The STUV 21-75-DF has a built-in fan that helps to circulate warm air throughout the room, and it is also equipped with a thermostat that allows you to control the temperature of the room. The stove is made of high-quality materials, and it is designed to last for many years.
Here are some of the possible use cases for the STUV 21-75-DF:
- Heating a single room or a small home
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