31
VFF Vent Free Fireplace System
Monessen • VFF 32/36 Owner Manual • 20308184 • Rev F • 02/19
MILLIVOLT CONTROL
FP2272
pilot correct flame
Thermocouple
for Natural Gas
Thermocouple
for LP
Correct Pilot Flame Appearance
FP2273
pilot bad flame
Thermocouple
for Natural Gas
Thermocouple
for LP
Incorrect Pilot Flame Appearance
CHECKING THE PILOT FLAME
The pilot flame must always be present when the heater
is in operation. It should just touch the top of the thermo-
couple tip for natural. Refer to Figure 61 for correct pilot
flame.
If the pilot flame does not touch the thermocouple, then
the main burner cannot function reliably. Refer to Figure
56 for incorrect shape of pilot flame.
PILOT AND BURNER FLAME APPEARANCE
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 BURNER FLAME
VFF32L/VFF36L MODELS
In normal operation at full rate after 15 minutes, the
following flame appearances should be observed:
Burner will have a random pattern of yellow flames. Figure
63 There should be glowing embers in front of burner.
NOTE: The front flames and embers will be an opaque
orange color during the burn off time.
VFF32C/VFF36C MODELS
In normal operation at full rate after 15 minutes, the following
flame appearances should be observed:
Burner will have a random pattern of yellow flames. Figure 64
OPERATING INSTRUCTIONS
Avoid any drafts that alter burner flame patterns.
Do
not allow fans to blow directly into the fireplace. Do not
place a blower inside the burn area of the firebox. Ceiling
fans may create drafts that alter flame patterns. Sooting
and improper burning will result.
During manufacturing, fabricating and shipping, various
components of this appliance are treated with certain oils,
films or bonding agents. These chemicals are not harmful,
but may produce annoying smoke and smells as they are
burned off during the initial operation of the appliance,
possibly causing headaches or eye or lung irritation.
This
is a normal and temporary occurrence.
The initial break-in operation should last six hours with the
burner at the highest setting. Provide maximum ventilation
by opening windows or doors to allow odors to dissipate.
Any odors remaining after this initial break-in will be slight
and will disappear with continued use.
This appliance must not be used with glass doors in the
closed position. This can lead to pilot outages and severe
sooting outside the fireplace.
FLAME APPEARANCE
Figure 61.
Millivolt Control Pilot Flame Appearance
Figure 62.
Millivolt Control Pilot Flame Appearance
Figure 63.
VFF Traditional with KW24-R Logs Flame Appearance
Figure 64.
VFF Contemporary Flame Appearance