Bedienungsanleitung Jotul GF 400 (Seite 14 von 20) (Englisch)

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Fuel Gas

Correct gas pressure is important; see the section about

gas pressure under Gas Installation, page 10. The gas

pressure before the valve and the gas pressure from the

valve to the main burner and pilot burner, are equally

important. These parameters may be the cause of various

performance problems.

If the gas pressure is too low, it can cause low pilot

flame, insufficient production of electricity at thermopile

and thermocouple, and poor flame pattern.

If the gas pressure is too high it can cause valve dam-

age if the pressure rises above 60 mbar. This is usually

the result of faulty installation or lack of a gas regulator

on the gas tank or cylinder. High gas pressure may also

cause an abnormally large pilot flame which can overheat

the thermopile and thermocouple, and further cause a

shutoff of the valve due to insufficient millivolt produc-

tion. Problems involving high flames and soot indicate

that the air volume is too small in relation to the gas

volume. It is wrong to correct the problem by adjusting

the air regulator, if the cause is that the gas pressure is

too high. Checking the gas pressure before the valve will

uncover faults in the gas supply at the valve or from the

tank/cylinder.

If the gas pressure to the valve is correct, the fault

must be found after the valve. A measurement performed

with a manometer will help you to swiftly uncover and

eliminate sources of errors. As mentioned above, blocked

or poor gas supply may lead to faulty combustion. Make

sure all gas tubes are dirt-free, as a small dust particle

can obstruct the pilot orifice. Components must remain

free of dirt during installation of the gas supply and

connection to the appliance, and when the valve is being

replaced.

Troubleshooting

When No Spark is Generated

at the Pilot Head

It is uncommon for the Piezo spark ignitor (fig 25-A) to

fail, unless it has mechanical damage. If the spark is not

conducted forward, it could be the result of a break in the

electrical circuit leading up to the pilot head. The spark

is small or weak if there is too much resistance from a

bent wire (E), or if corrosion appears at the electrode (G)

or the pilot head (H). This could result in insufficient heat

to light the gas. Inspect the pilot burner by looking for

damage to the individual parts. Check for damaged wires

or wires crushed between plate sections of the appliance

and check for loose connections.

Follow the trouble-shooting procedure below when no

spark is generated at the pilot head electrode:

1. Make sure the spark gap between electrode (G) and

pilot head (H) is smaller than or equal to 3.2 mm. If not:

check if the electrode is loose or damaged

2. Make sure the spark ignitor (A) is securely mounted

and the ground connection is in contact with the

bracket. If not: turn the spark igniter until the ground

connection is in contact with the bracket and tighten

the nut at the back of the spark igniter.

3. Make sure the insulated wire (E) is intact and without

cracks and properly connected between spark igniter

(A) and electrode (G). If not: properly fasten the insu-

lated wire to establish a connection between the spark

igniter and the electrode. Replace the electrode if the

wire is damaged or cracked.

4. Make sure the ceramic insulation (F) is intact and with-

out cracks If not: replace the electrode.

5. Make sure a spark is generated when you dismantle

the Piezo spark igniter and put the ground connector

against a metal piece, and the control knob (red mark)

on the spark igniter is finally pushed to the bottom (B).

If not: replace the Piezo spark ignitor.

Figure 25. Pilot ignition components.

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