Ventilation; Installation Of Appliance Firebox; Installation Of Gas Burner; Lighting And Controlling The Fire - Jøtul Gas Atra 740 DS Installation And Operating Instructions Manual

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Normally 6" or 150mm from the edge of the appliance casing
will be sufficient. Check temperatures after several hours
operation if in doubt about materials and their suitability.
No curtains may be positioned above the appliance.
The chimney must have suitable liner for direct connection
to the appliance flue outlet spigot. Under no circumstances
may the appliance be fitted directly into a fireplace or
chimney without direct connection to a proper flue pipe.
Failure to observe this could cause abnormal operation of
the appliance leading to a dangerous situation.
The gas supply can be laid into the firebox from underneath
the gas burner assembly (chased into the constructional
hearth) as the firebox has an open base.

4. Ventilation

For UK installation every 1kW above 7kW gas input, there
must be 5cm
2
of additional purpose provided ventilation.
For example: if the input is 8.15 kW (see data badge) this
2
requires 1.15kW x 5cm
This can be directly to outside air through an outside wall
or through another room – but the next room must also
have sufficient permanent ventilation to the outside. If in
doubt consult a Corgi registered fitter.

5. Installation of Appliance Firebox

The gas supply must have a shut off valve near the appliance
for maintenance purposes. A restrictor elbow is supplied
with the appliance to use if one is not already present.
Only use the minimum length of 8mm diameter pipe for
this fire. It has a high heat input and using more than 0.3m
of 8mm diameter pipe for the final connection is likely to
lead to an excessive pressure drop. Use minimum 15mm
pipe for the lead up to the appliance and 22mm further
back.
Plan to site the flame and ignition gas control on the
appliance in the room that will be used most. There is only
a gas control at one side of the double sided appliance.
Remove the glass panels (2 screws at bottom edge of each)
and lift out the draught diverter assembly (packed inside
the firebox) complete with flue spigot connector and place
to one side.
Lift out the log retainers noting that the back one (side
away from the gas control) is slightly smaller than the front
one.
Insert the firebox into the opening and position correctly.
Bring flue liner down into top of firebox through hole in
top.
Put gasket onto draught diverter flange and slide flue spigot
and draught diverter assembly onto flue liner until properly
engaged. Do not push liner down further than lower fixed
stops in spigot.
Use self-tapping screws to secure flue liner to flue spigot,
making sure that the draught diverter part of the assembly
is left clear for gases to enter the flue liner. This must be
observed. Failure to screw the liner on properly or blocking
the gap for products of combustion to enter the flue pipe
will cause abnormal operation and may be dangerous.
Push the whole assembly up into the hole in the firebox
top and secure with screws provided.
Decide which side of the fire is to have the gas control
present. Now lay in the gas pipe to the right side of the
opening when facing the side to have the control. Place the
burner into the firebox to mark the position of the gas
connection to the valve. Remember to only use the shortest
piece of 8mm pipe possible.
2
= 5.75cm
of permanent ventilation.
Complete the gas pipe for the burner assembly to the right
hand side front underneath the firebox. Knockouts are
provided in the sides of the firebox if necessary but the gas
pipe can be brought in underneath the fireplace base in
most instances as the firebox bottom is open.
Make good the wall surface up to the firebox or fit a trim.
Always use non-combustible materials e.g cement render
and not plaster. Marble slips, metal or stone panels etc can
be used to replace plaster around the firebox if required.
Basic plaster and plasterboard do not usually have sufficient
heat resistance to be used directly above the firebox.

6. Installation of Gas Burner

Place burner into firebox. Angle control valve through the
cut-out in the firebox base first and then lower down
gradually, making the angle horizontal as it is lowered.
Sometimes this is easiest from the side away from the
control valve.
Purge gas pipe to ensure any dust or debris is removed
from it before connection to valve. The valve may be
permanently damaged if this is not done and will be a
chargeable replacement.
Connect the gas pipe to the control valve using the internal
compression nut and olive (compression ring) provided.
Secure the burner to the firebox through the legs using the
four M4 screws provided. Note that only 4 of the 8 holes
are required depending upon which way the burner is
installed.
Place log retainers in firebox. The larger one goes at the side
of the burner with the gas control present. The smaller one
goes at the other side.
Check for gas soundness and operation of ignition and pilot.
Place pilot shield in front of pilot by hooking on to edge of
burner tray.
Install ceramics with instructions provided in pack.

7. Lighting and Controlling the Fire

From the off position, press in and turn the knob anti-
clockwise. A click will be heard from the piezo spark
generator and the gas should ignite at the pilot. If it does
not light first time, repeat until it does. When pilot is lit hold
knob in for about 10 seconds to actuate the flame safety
valve. If the pilot goes out, try again but hold in firmly for
longer.
Release valve knob and turn fully anti-clockwise to release
gas to main burner. Once burner is lit the gas flow may be
regulated by turning between low and high flame settings
to the desired level.
To turn back to pilot only, depress the control knob slightly
first before selecting that position.
To switch off completely press knob slightly and turn fully
clockwise of off position.
Do not
Do not
Do not
Do not relight burner for 3 minutes after switching off from
Do not
hot condition.

8. Important Appliance Control Notes

This appliance is fitted with an Oxygen depletion sensing
pilot unit which automatically shuts off the gas to the whole
burner system if the oxygen levels in the room drop
significantly. This can be caused by lack of ventilation or a
blocked flue system which could cause dangerously poor
combustion due to depleting oxygen levels.
5

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