HearthStone Quality Home Heating Products, Inc.
TUDOR 8120 Gas-Fired Direct -Vent
24
unit on). Note that the thermostat controls
the on/off cycling of the main burner, but
the pilot remains lit regardless of the
thermostat setting. The only way to turn the
pilot off is to turn the gas control knob fully
clockwise to the “OFF” position.
T
O
T
URN
O
FF
G
AS
T
O
A
PPLIANCE
1. Set the thermostat to the “OFF”
position or turn the ON/OFF/T-
STAT switch to the “OFF”
position.
2. If shutting the unit off for the
non-heating season, turn the gas
control knob fully clockwise to
the “OFF” position. Do not force
the knob to turn.
A
IR
S
HUTTER
The air shutter is used to regulate the air-to-
gas combustion mixture, which in turn
influences the size and color of the flames.
The air shutter is positioned in the general
location needed for the type of gas being
used, however, if the unit is not burning as
well as it should, then the air shutter may
need adjusting. The air shutter may need
adjustment once the unit has been installed
to compensate for variations in supply line
pressure, restriction plate position, altitude,
gas type conversions, and other variables.
To determine if the air shutter needs
adjustment, it is necessary to view the flame
pattern with the variable output control knob
at its highest setting. Allow the unit to
operate for at least 10 minutes to allow the
entire unit to reach temperature, and for the
flame pattern to stabilize. Generally, the
more air (open shutter) in the mixture, the
bluer the flame. Less air (closed shutter)
results in a more yellow flame, but too little
air will result in incomplete combustion, low
efficiency and a dirty burn. There are two
simple guidelines to aid in determining the
correct flame pattern:
1. If the flame at the base of the logs is
completely blue, the air shutter may
be open too far;
2. If the flame is dirty or licks the top
of the stove, the air shutter may be
closed too far.
Some conditions cannot be corrected
through air shutter adjustment; an
adjustment must be made to the gas supply
pressure or by changing the restriction plate
location. Qualified service personnel must
perform supply line/manifold gas line
pressure adjustments and restrictor plate
adjustments. Do not attempt to complete any
part of the installation or adjustment of this
unit unless technically qualified to do so.
A
IR
S
HUTTER
A
DJUSTMENTS
Loosen the air shutter locking nut prior
to lighting the unit.
This nut will get very
hot after operation and will be difficult to
loosen. Use a 5/16” wrench and loosen the
nut on the slider adjuster under the firebox.
Loosen the set nut and slider the adjuster to
adjust the flame pattern. Use only metal
tools for this adjustment. The air shutter
adjuster, located under the valve access
door, in the lower front of the unit, is
adjustable while the stove is burning. Slide
the adjuster left to open the air shutter, and
right to close the shutter. When the flame
pattern is correct, tighten the set nut without
letting slider move. The air shutter is
factory set and only a qualified gas
technician should make adjustments.
Note:
Very little movement is needed to
substantially change the burn and flame
patterns. Some conditions cannot be
corrected through air shutter adjustment; an
adjustment must be made to the gas supply
pressure. Supply line/manifold gas line
pressure adjustments must be performed by
qualified service personnel. Do not attempt
