Monessen Hearth VFCS20DNV - Manual (Page 19)

58D6002 19
Flames from the pilot, front and rear burner should be visually checked as soon as the heater is installed.
In addition, periodically check the flames visually during operation.
CHECkING PILOT FLAME
The pilot flame must always be present when the heater is in operation. It should just touch the top of the
thermocouple tip for natural. See Figure 17 for correct pilot flame.
If the pilot flame does not touch the thermocouple, then the burners cannot function reliably. See Figure 18 for
incorrect shape of pilot flame.
MILLIVOLT CONTROL
Figure 17 - Correct Appearance of Pilot Flame Figure 18 - Incorrect Appearance of Pilot Flame
Thermocouple
for Natural
Thermocouple
for LP
Thermocouple
for LP
Thermocouple
for Natural
FLAME APPEARANCE