Hearthstone Quality Home Heating Products, Inc.
TUDOR 8120 Gas-Fired Direct-Vent
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
The air shutter adjuster, located under the valve
access door, in the lower front of the unit, is
adjustable while the stove is burning.
Use a 5/16” wrench to
l
oosen the air shutter
locking nut while holding the screw prior to
lighting the unit.
This nut will get very hot during
operation and will be difficult to loosen.
1. Turn the screw in to close the shutter or out
to open it. Use only metal tools for this
adjustment.
2. When the burner starts to rise while turning
the screw in, the shutter is fully closed. Stop
turning the screw in.
3. When the flame pattern is correct, tighten
the locking nut without turning the screw.
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 to
complete any part of the installation or adjustment of
this unit unless technically qualified to do so.
P
ILOT
A
DJUSTMENT
The pilot light is preset by the manufacturer and
should not need adjustment. The pilot light flame
should be large enough to engulf the thermopile and
thermocouple located next to the pilot, but not so
large as to create excessive noise or consume
excessive gas
.
However, it can be adjusted by
means of the pilot light adjustment screw located on
the gas control valve
(Refer to figure 10)
. Open the
valve door to access the pilot adjustment screw.
Note that the pilot flame must engulf the thermopile
so that the thermopile can generate sufficient milli-
voltage (325 to 500-mv) to power the gas control
valve. The flame on the pilot should look like
Figure
12
. Controlling the Tudor by the wall-mounted
thermostat may become erratic, nonexistent, or the
unit may go out, if the pilot flame is too small or
misdirected away from the thermopile.
25
