16
Problems With the Flame Pattern
Tall, narrow, yellow flames
These flames can soot the vent system and may be the
result of insufficient oxygen supply. Check for correct air
volume by measuring the opening (fig.
19)
at the air
shutter.
Correct opening dimensions are normally:
For Propane - Open 12.6 mm (fully open)
For Natural Gas - Open 9.6 mm
Warning! To avoid burns, do not adjust the air opening
until the burner has cooled down. Blocked orifice: Make
sure the main orifice (fig.26) is dirt-free and that the
orifice has the appropriate size. See technical data.
Poor draught in the vent system may be due to
improper installation or because the vent has no climb
towards the chimney.
Tall, blue flames
The cause may be too much oxygen. Check for correct air
volume by measuring the opening (fig. 19) at the air
shutter. The cause may also be that the gas pressure is
too high. Check the gas pressure as described in the
section about gas pressure on page 10.
When There is No Gas Supply to the
Burner.
This is the trouble-shooting procedure for the electrical
components:
1. Make sure the control knob on the valve is set to “ON”.
Check the position on the “ON/OFF/Thermostat” switch
at the back of the appliance. It should be set to the ON
position.
2. Make sure the wire from the valve to the “ON/OFF/
STAT” switch is connected correctly.
This is the trouble-shooting procedure for the thermopile
(fig. 25):
1. Make sure the gas pressure is correct (see section
about gas pressure, page 10).
2. Make sure the pilot burner has 3 flames.
3. Make sure the flame is centred on the thermocouple.
4. Make sure the thermocouple is enveloped by the flame
up to at least 10mm (3/8") from the tip (fig 19).
5. Check the wires to the thermopile for cracks or damage.
6. Dismantle the wires from the vent.
7. Dismantle optional equipment, such as thermostat or
remote control.
8. Check the voltage generated by the thermopile (see fig
25). Connect the multimeter with plus to one cable clip
(D). Connect minus to the other cable clip. Light the pilot
and make sure the control knob remains on “PILOT” (fig.
21-B). At this point the multimeter should show 500-
700mV.
9. Reconnect the wires to the valve and make sure only
the ON/OFF/STAT switch is connected.
10.Turn the control knob on the valve to “ON” and turn the
ON/OFF/STAT switch to “ON”. At this point the multim-
eter should show more than 300 mV.
11. If a thermostat or remote control is to be connected, it
can be done now. At this point the multimeter should
show more than 175 mV.
Figure 24.
Thermocouple system
check.
Figure 25.
Thermopile system
check.