Jetmaster MYNX User manual

INSTALLATION
& OPERATING
INSTRUCTIONS
MYNX
THE FIRST DIY FIREPLACE

INSTALLATION & OPERATING INSTRUCTIONS 1
CONTENTS
INDEX
PLEASE READ THIS CAREFULLY BEFORE STARTING WORK
INSTALLATION AND OPERATING
INSTRUCTIONS: MYNX
1) Index 1
2) Technical Data 2
3) Placement Of The Unit 2
a) Placement inside the room 2
i) Safety distances 2
ii) Hearth 3
iii) Roof / ceiling influence 3
b) Roof & Ceiling requirements 3
i) Flue length 3
ii) Flue termination point 4
iii) Ceiling penetration 5
iv) Roof Cavity 6
c) Additional accessories 7
4) How To Install 8
a) Locate the unit, and cut through the ceiling 8
b) Now fit the flue pipes. 8
c) Fixing the flue length. 10
d) Fitting the cowl. 10
e) The flue pipe must now be sealed on top of the roof. 10
f) Heat insulation. 14
g) Finishing. 14
5) Use 16
a) What wood to use 16
b) Building a fire 16
c) Using the damper (accessory) 17
6) Maintenance 19
a) Painting of exposed surfaces. 19
b) The log pan 19
7) Warrantee 20

Installation and operation of the Mynx
3) Placement Of The Unit
a) Placement inside the room
i) Safety distances
The distance from the back of the unit
to the closest wall should be at least
100mm
The distance from either side of the
unit to the closest wall should be at
least 300mm
Heat is radiated from the front of the
fireplace. It is therefore important to
take special care that no combustible
material is placed close to the opening
of the fireplace. No combustible materials
e.g. wooden furniture, cupboards and
fittings should be placed within 700 mm
from the opening of the fireplace.
NOTE:
The safety distances quoted above, assumes
that all walls are constructed from heat
resistant materials. If any combustible
materials are used (e.g. wooden panels)
additional measures should be taken to
protect these materials from the heat
radiated by this fireplace.
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A B C D ROOM SIZE
FLUE SIZE
530 400 780 Ø175 105m3

ii) Hearth
Heat is radiated from the bottom of this
fireplace. It is therefore important to
ensure that the fireplace is installed on a
non-combustible surface.
A popular example of such a surface is a
floor, tiled with ceramic tiles.
Do not install this unit directly onto
wooden or carpet floors. For these areas
a non-combustible hearth must be placed
underneath the unit.
The size of the heart must cover at least
the area underneath the unit with a border
of 100mm all round and 200mm in front
of the unit.
A popular example of such a hearth is a
marble, or granite slab.
iii) Roof / ceiling influence
It is important to take into account all
requirements for the flue height, flue
protection and the flue termination, before
making a final decision on the location of
the fireplace in the room.
NOTE: First read the rest of this manual
before starting the installation
INSTALLATION & OPERATING INSTRUCTIONS 3
INSTALLATION AND OPERATING INSTRUCTIONS: Mynx
Installation and operation of the Mynx
b) Roof & Ceiling requirements
i) Flue length
NOTE: It is important to note that the correct
installation of the flue will ensure that the
unit functions properly. Deviation from these
requirements would lead to un-satisfactory
performance.
The length of the flue must be at least
3.6m.
The standard number of flues supplied
is 3 x 1.2m flues with a sliding section
that can add up to 1m additional flue
length.
The desired positioning of the unit in
combination with the roof height and
angle, can dictate that a longer flue than
the standard 4.6m would be required.
Additional flue lengths are available in
standard lengths of 1.2m.
NOTE: Longer flue lengths could cause an
excessive draw through the flue pipe. This
could result in less heat being transferred
into the room. To counteract this an additional
damper flue section can be purchased and
installed as the first flue section on top of
the unit.

ii) Flue termination point
It is important to terminate the top of
the flue in such a way that it will allow
free passage of combustion products to
the atmosphere without being subjected
to turbulent air or high pressure zones
that could cause a downdraught.
The guidelines stipulated below are the
minimum requirements allowed.
Surrounding landscapes, buildings and
inclement weather conditions, not
addressed below, could also influence
the escape of combustion products.
Contact your local Jetmaster agent for
assistance in this regard.
Installation and operation of the Mynx
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OPERATING INSTRUCTIONS: Mynx
Roof pitch more than 10°
Roof pitch less than 10°
C
A
B
D

The gap is finished neatly by fixing the
escutcheon plate to the ceiling, covering
the hole. Refer to the installation instructions
for detail on fitting the escutcheon plate.
See Page 14 section 4)g)
A gap of 150mm must be left between
brandering beams and the flue pipe.
Should the gap be less than 150mm,
then added insulation between the flue
pipe and the brandering should be
provided.
iii) Ceiling penetration
Refer to Figure 3
The ceiling boards must be protected
from the heat that will be generated by
the flue pipe. It is therefore important
to comply with the following.
The flue diameter is Ø175mm. A
Ø200mm hole must be cut in the ceiling,
thus leaving a 12-13mm gap all round
the flue pipe.
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INSTALLATION AND OPERATING INSTRUCTIONS: Mynx
Installation and operation of the Mynx
IF
If the flue is closer than 600mm
to the apex of the roof
If the flue is further than 600mm
from the apex of the roof
If any building is closer than 2m
from the flue
If the roof pitch is less than 10°
Then
The flue termination must be at
least 600mm above the roof apex.
The flue termination must be at
least 1000mm above the roof level.
The flue termination must be raised
until it is clear within 2m.
The flue termination must be at
least 1000mm above the highest
point of the roof.
A
B
C
D

Installation and operation of the Mynx
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provided to prevent the wooden beams
from overheating.
It is recommended that all joints in the
flue pipe, should be secured using self-
drilling screws, and sealed using heat
resistant silicone. It is normally not
necessary to secure a single joint that is
visible from the inside of the room. Care
must be taken to ensure that the integrity
of the flue installation is not compromised.
iv) Roof Cavity
It is important that all combustible
materials in the ceiling cavity be protected
from the heat radiated by the flue pipe.
It is recommended that the complete flue
run in the ceiling cavity be insulated, using
ceramic wool.
A gap of at least 150mm must be left
between the flue pipe and any wooden
beams. Should the gap be less than 150mm,
and then added insulation must be

c) Additional accessories
In order to allow multiple installations,
the following accessories are available:
i) Basic flue kit
This kit is required with all installations.
It contains the necessary parts that will
allow you to perform the most commonly
occurred installations
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INSTALLATION AND OPERATING INSTRUCTIONS: Mynx
Installation and operation of the Mynx
ii) Additional flue lengths
Additional flue pipe sections of 1.2m can
be used where the length of a standard
flue needs to be extended

Installation and operation of the Mynx
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INSTALLATION AND
OPERATING INSTRUCTIONS: Mynx
iii) Damper flue section
This is a short flue section containing
a damper.The damper can be used to
regulate the draw through the flue pipe,
improving the efficiency of the unit.This
part is especially functional on flue
lengths of more than 4.6m
iv) Wall penetration kit
If an installation through a ceiling is
not possible, then this kit can be used
to route the flue pipe horizontally
through a wall, and back to the vertical
position on the outside of the wall

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INSTALLATION AND OPERATING INSTRUCTIONS: Mynx
Installation and operation of the Mynx
4) How To Install
a) Locate the unit, and cut
through the ceiling
After the appropriate floor level position
for the unit was decided on,it is important
to ensure that the roof structure will
allow for the flue pipe to pass safely
through the roof. Note the requirements
described under Roof & Ceiling requirements
above. See page 3 section 3)b)
Carefully cut a hole through the ceiling
in a position away from any timber beams
or brandering, making sure that the
opening is Ø200mm. Use the ceiling
escutcheon plate inner diameter as a
template and add 12 mm all round.
Remove roof tiles in the immediate area
or cut a similar hole through the roofing
material. It is important to note the size
of the base plate of the flashing. It might
be necessary for example, to remove
additional roof tiles, in order to allow the
flashing to be located properly.
If a hearth is to be constructed (e.g. in a
carpeted room), use a plumb line from
the centre of the hole in the ceiling to
determine the position of the hearth.
The next step is to carefully locate the
unit in its final position.
b) Now fit the flue pipes.
Flue pipes are fitted with the knurled end
facing upwards. Slide the flue pipe over
the collar on top of the unit
NOTE: If a damper section is fitted, this must
be the first section fitted directly on top of
the unit. Ensure that the operating mechanism
will be accessible for use during operation.
The handle mechanism is intended to be
facing towards the front of the unit.
Fit the rest of the flue pipes by sliding the
plain end of the higher pipe, over the
knurled section of the lower pipe.
TIP: It might be easier to first join two pipes,
and then lift both pipes so that the top section
goes through the ceiling. Then fit the next
section underneath. This will be at a more
convenient height. The completed flue can
then be lifted on top of the unit as a last step.
The flue pipes are designed to form
adequate seals on each joint, and to form
a neat joint.The joints are not designed
to keep the flue sections in a straight line.
Keeping the flues in a straight line must
be done by providing support from the
outside of the flue.

Installation and operation of the Mynx
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A typical scenario is:
The bottom of the flue pipe is located
on the fireplace.There is one joint in
the flue exposed inside the house,
without any securing screws.The flue
pipe is indirectly supported by the
escutcheon plate in the ceiling.The flue
pipe has one joint inside the roof cavity
that is secured with 2 screws, and sealed
with silicone.The flue is then supported
indirectly at the roof level by the roof
flashing

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Installation and operation of the Mynx
c) Fixing the flue length.
Refer to section 3)b)ii) on page 4 for the
details on the position of the flue
termination point.
The top section of the flue can be slid up
or down to achieve the desired flue length.
When the desired length has been
reached, secure the 2 sections using at
least 3 self-drilling screws. Ensure that the
following is complied with:
• The 2 flue sections must overlap by
at least 120mm
• It must be fastened with at least 3
screws.
d) Fitting the cowl.
NOTE: Before fitting the cowl, it is important
to ensure that the flue has been set to the
correct height.
Slide the cowl base into the top of the
flue pipe.
Secure the cowl base onto the flue pipe
with at least 1 self-drilling screw.
e) The flue pipe must now be
sealed on top of the roof.
NOTE: Before fitting the flashing, it is important
to verify the final flue height. It is normally
easiest to first fit the flashing and fix the flue
height last. In some cases it might be easies
to first fix the flue height, before fitting the
flashing. (E.g. if the joint between the last 2
flue sections would be on the same level as
the flashing)

Installation and operation of the Mynx
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INSTALLATION AND
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The first step in this process is to cut /
break a hole through the roof surface.
For roof materials manufactured of steel
sheets (e.g. IBR, Corrugated iron etc.) it
is recommended that an angle grinder
be used to cut a hole through the roof
sheeting material.
For tiled roofs, remove the tiles directly
above where the flue must go through.
Fit the next flue sections so that it goes
through the hole in the roof.
NOTE: It is important to ensure that the
hole cut in the roof is as small as possible.
Any gaps between the flue and the roofing
materials must be as small as possible.
For tiled roofs it is important to fill the
gaps between the flue and the roof tiles
with partial tiles. For example, it might
be necessary to cut a tile in half, to allow
such half a tile to be replaced next to
the flue. On the top section of the flue
it might be necessary to fit a full tile but
slide it higher up, to fill the gap of half a
tile.
Slide the lead flashing over the flue pipe.
The hole provided in the flashing is slightly
smaller than the size of the flue pipe
itself.This is to aid a proper form on the
final installation. Using pliers, the flashing
can be manipulated to allow it to slide
over easily.
The flashing should now be formed onto
the roofing materials.
NOTE: Bear in mind that the aim of this
process is to prevent water leakage through
the roof. Always be on the lookout for possible
water leaks that can be avoided!
Form the flashing from the centre
outwards.The aim is to make the flashing
take the same shape as the roofing material
as well as to close any gaps between the
flashing and the flue pipe.
Start by forming the flashing by hand,
firmly push the flashing down as far as it
would go without applying any strain.Then
using a hammer, lightly knock the flashing
down onto the roof, forming it down into
all corners.
Working from the inside outward, repeat
this process a few times forming the
flashing a bit deeper with every repetition.
Repeat this until it takes the same shape
as the roof.
Now, form the flashing onto the flue pipe.
Again this is normally easiest using a
hammer, and gently knocking the lead up
against the flue pipe.
NOTE: During the forming process ensure
that you do not apply heavy force, and that
you do not tear through the lead flashing.
Should the flashing however be torn, this can
be sealed as described below.

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INSTALLATION AND OPERATING INSTRUCTIONS: Mynx
Installation and operation of the Mynx
NOTE: On most tiled roofs, it would be
allowable to lift the row of tiles right above
the fluepipe and to place the top of the lead
underneath these tiles.
The flashing must now be sealed against
the roof materials.This is done using the
membrane and acrylic waterproofing paint.
All forms of surface contamination must
be removed to ensure a smooth surface,
free of moisture and any loose material,
or any other barrier to adhesion. Steel
and galvanised steel surfaces must be free
of loose paint, grease, grime, oil and rust.
All surfaces must first be prepared with
a primer coat.
For all non-metal surfaces (For
example roof tiles) mix 50 % waterproofing
paint and 50% clean water to prime the
entire surface.Allow a 30-minute drying
time.
For metal surfaces (for example
galvanised roof sheets) use the Jetmaster
heat resistant paint to prime the area.
Allow a 30-minute drying time.
Cut strips of membrane long enough to
cover each edge of the flashing
Apply at the rate of 1 litre/m2 undiluted
waterproofing paint and immediately
embed the membrane into the wet paint,
ensuring no creases or folds in the
membrane. Work the membrane
thoroughly into the waterproofing paint
using a brush. Ensure that the membrane
forms into all crevices and that it
completely covers the edge of the flashing.
The waterproofing paint should be evident
"striking through" the membrane and if
this is not the case, too little waterproofing
paint has been applied or the waterproofing
paint has been allowed to dry before
embedding the membrane.
NOTE: Ensure that an area of at least 100mm
around the joint between the flue pipe and
the flashing is not contaminated with the
paint.
Allow a 30 minute drying period before
any second layer sections are laid.
It is recommended that the complete
supply of waterproofing paint and
membrane be used to apply additional
layers in sensitive areas. (For example on
corners, or at tile overhangs, or over roof
screws)
Note: Drying times could vary based on
atmospheric temperature and humidity. The
quoted drying times is based on 25°C and
60% humidity.
The next step is to seal the joint between
the flue pipe and the flashing, using heat
resistant silicone.

Installation and operation of the Mynx
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INSTALLATION AND
OPERATING INSTRUCTIONS: Mynx
Ensure that the area to be sealed on the
flue pipe and the flashing is clean and
free from dust, rust, oil and any other
contaminants.
Apply silicone generously, ensuring that
all gaps are covered.The silicone can be
smoothed around the pipe and over the
edge of the flashing, using a wet finger.
NOTE: Before attempting to smooth the
silicone with a finger, first inspect the area
for any protrusions or materials that might
lead to personal injury!
Do a final inspection of the complete
joint. If any possible water leaks are
detected, cover that as described above.
NOTE: The paint is water based, and will
be washed away if it is exposed to rain
before it has dried. The paint needs 24
hours to dry properly.
NOTE: Allow at least 24 hours for both the
paint and the waterproofing paint to dry
before attempting to light a fire

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INSTALLATION AND OPERATING INSTRUCTIONS: Mynx
Installation and operation of the Mynx
Heat insulation.
It is important that all safety distances
referred to in this manual are adhered
to.
Combustible materials that are within
the safety distances must be insulated
to prevent it from being exposed to the
heat from the unit.
It is recommended that covering it with
ceramic wool should insulate the
complete flue run inside the roof cavity.
If the complete flue run inside the roof
cavity is not insulated, care should be
taken to ensure that all combustible
materials are protected. It must also be
noted that heat will build up throughout
the roof cavity to levels that might be
damaging in the long run.
g) Finishing.
The ceiling must be finished by fitting
the escutcheon plate around the flue
pipe onto the ceiling.
The escutcheon plate comes in 2
sections. Each section is fastened onto
the ceiling board.
Hold the escutcheon plate in place and
mark where the 6 holes should be cut
for the 6 screws.
Cut holes large enough to let the spring-
loaded toggle screw legs through. A
Ø16mm hole should be adequate.

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INSTALLATION AND
OPERATING INSTRUCTIONS: Mynx
Fit the 3 screws (Ø5mm x 30mm long)
through a half-moon section of the
escutcheon plate, and fit the spring-loaded
toggles on the end of the screws. The
spring-loaded side must now be pushed
through the ceiling by compressing the
legs and allowing it to expand again on
the other side of the ceiling board.
To tighten the screws, they can be turned
by hand while gently pulling down.This
will prevent the legs from rotating freely.
It can be
NOTE: Do not seal the small air gap between
the flue pipe and the escutcheon plate.
All metal surfaces exposed inside the home, can be wiped clean with a clean dry
cloth, and any marks should be touched in using Jetmaster touch-up paint.
All metal surfaces exposed on the outside of the building must be coated with a high
quality heat resistant enamel paint. Before applying the enamel paint, first ensure that
all scratches are touched in with the Jetmaster touch-up paint. This will lay the
foundation for a durable outer coating.

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INSTALLATION AND OPERATING INSTRUCTIONS: Mynx
Installation and operation of the Mynx
5) Use
a) What wood to use
Wet wood that is unseasoned will not
burn efficiently and will more than likely
cause smoking in excess of permitted
emissions allowed in smoke controlled
zones
Wood should have been stored
(seasoned) in a dry but ventilated place
for a year before burning. Green (freshly
cut) wood contains around 50%
moisture. Heat from the fire has to drive
this off as steam before the wood can
burn effectively.This heat is lost in the
formation of steam.Apart from burning
your wood in an efficient appliance,
burning seasoned wood is the greatest
step towards efficiency. Air-dried
seasoned wood has about 20% moisture
content; this reduction makes a
tremendous difference to the heat
output of the fire.
Hardwoods are better for open fires
than softwoods (pines, etc. which burn
too fast and spit).
A split log will catch and burn better
than a round log.
b) Building a fire
Start by placing some fire lighters or
crumpled up newspaper at the bottom
of the log pan.
Place a layer of kindling (fine wooden
pieces) on top of the firelighters. Place
it in a criss-cross pattern or similar, to
allow for air movement around and
through them.
Place some smallish logs on top.
Ignite the firelighters, and allow the fire
to settle for a few minutes. Larger logs
can be added once the fire has been
established.
The fire can be maintained by adding
logs while there are still flames. Fresh
logs will catch alight easier when there
are still flames, than when it is placed on
a bed of hot coals only.
NOTE: The bigger the fire the more heat
is transferred to the room.
It is important not to place logs on the
fire protruding from the front of the log
pan. Such logs can cause spillage of
smoke, or un-acceptable burn patterns.

Installation and operation of the Mynx
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c) Using the damper (accessory)
A Flue damper is available as on optional
extra.This damper can be used to improve
the control over the fire especially in
installations with flue systems longer than
4.6m
The damper operates by restricting the
flow through the flue pipe. Slowing down
this flow rate, especially when a large fire
is burning, will allow more of the heat to
be conducted into the room, and less heat
escape through the flue pipe.
The fire should me monitored continuously
so that the correct damper setting for the
specific stage of burn can be set.
How a damper is typically used
When the fire is started the damper is set to the Open position, allowing the
maximum draw, while the most smoke can be expected.
When the fire is established, the damper is turned down to position 1.The user will
check that there is no spillage of smoke into the room. If there is spillage, turn the
damper back to the open position.
close
open
1
2
The damper settings are as follows:
Setting % of normal area
Open 100%
Position 2 70%
Position 1 50%
Closed 30%
NOTE: Even the closed position of the damper does not
completely seal the flue pipe. There will always be an opening
for combustion products to pass the damper.
Use the poker stick to operate the damper.
• Place the end of the poker stick through the circle, in
the damper shaft.
• Pull.
• Turn to the desired position
• Push back to lock it in place
• Remove the poker stick.

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Installation and operation of the Mynx
If there is no spillage, the damper can be
set to position 2, and again checking for
spillage. If there is any spillage, turn the
damper back to position 1.
The same process can be followed,
switching to the closed position, and
checking for spillage.
NOTE: The idea is to set the damper to
the smallest position that still allows for
adequate draw.
The fire can now be left to burn for a
while. It must be noted that the size of
the fire will affect the optimum damper
position. The ideal is to add wood at
such intervals that the fire is maintained
in the same intensity, in order to maintain
the damper position.
If the fire is left to die down, it will be
necessary to start opening the damper
again, allowing a better draw.
If a large quantity of wood is added, the
damper should be opened fully, and only
closed down again when the fire is
established.
NOTE: It is important in all situations to set
the damper so that no smoke enters the
room. If in doubt over the damper position,
rather opt for the safer setting and choose
the setting that allows more draw.
6) Maintenance
a) Painting of exposed surfaces.
All surfaces that are exposed outdoors
must be inspected regularly. Any paint
deterioration must be fixed immediately.
All indoor exposed surfaces should be
inspected on a regular basis (at least
annually).Any scratch marks or other
marks showing paint deterioration,
should be repaired using Jetmaster touch-
up paint, immediately.
NOTE: Before painting any surface (indoor
or outdoor) it is important to clean the area
properly to ensure that the new coat of
paint covers no dirt, or rust.
b) The log pan
The log pan is a consumable item. It will
deteriorate during use.The life span of
the log pan will be determined by the
manner in which it is used, the fuel that
is burned as well as the frequency of
use.
It is best to leave a layer of ash in the
bottom of the log pan. This acts as
insulation, improving performance as
well as the lifespan of the log pan.
It is therefore recommended that during
the winter season, the log pan be cleaned
only as necessary. Each night the fire can
be started on top of the ashes of the
fire from the previous fire. This will
typically result in the log pan being
cleaned on a weekly basis.
At the beginning and at the end of the
winter season, the log pan can be
removed completely, all deteriorated
paint films brushed off, and re-coated
using Jetmaster touch-up paint.