HearthStone Quality Home Heating Products, Inc.
MODENA 8140 Gas-Fired Direct-Vent
18
forward to close the air shutter. Pull it towards you to open
the air to the unit. 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. However, you should perform a periodic
visual check of the pilot flame. 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
(Refer to figure
11)
. If needed, the pilot flame is adjustable by means of the
pilot light adjustment screw located on the gas control valve
(see figure 9)
. 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 11
.
Controlling the Modena by the remote or 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.
IGNITER
THERMOCOUPLE
PILOT
FLAME
THERMOPILE
PILOT CLIP
Figure 11: Pilot assembly
W
ARNING
The control has an interlock device. If the stove was lit, it
will not relight immediately. After shutting off all gas flow,
the pilot burner cannot be relit until the thermocouple has
cooled, releasing the electromagnet
(Approx. 60 sec.)
. The
gas control knob is designed to operate by hand. Do not use
any tools during this operation.
B
URNER
F
LAME
A
PPEARANCE
Once the unit is lit, observe the flame pattern and adjust as
necessary. You should perform a periodic visual check of
the burner flame. The burner flames can be adjusted by
means of the air shutter. To determine if the burner flame
needs adjustment, it is necessary to view the flame pattern
with the variable output control knob at its highest setting
(turn fully clockwise). Allow the unit to operate for 10
minutes - enabling the entire unit to reach temperature and
for the flame pattern to stabilize. The flame pattern should
be similar to the one shown in
Figure 12
. There are several
guidelines to aid in determining if the flame pattern is
correct:
1.
The flame should not be dirty, smoky, sooty, or lick the
top of the stove.
2.
The flame should not rise off the burner; this is called
“lifting”.
3.
Flames should not impinge heavily on the stone set.
They should “fit” through the designated spaces once
the stone set is properly installed.
Figure 12: Typical flame appearance (Shown with white
stones for better view)
R
OUTINE
M
AINTENANCE AND
C
ARE
The Modena requires minimal routine maintenance and
care. Ensure the Modena is cool and off when being
cleaned, or serviced. Once a year, the unit, and venting
system should be inspected by qualified service personnel
to insure that they are clean, free of obstruction, safe, and in
good working order. If service or maintenance is required,
qualified service personnel should perform it.
WARNING:
Do not substitute materials.
For
replacement parts, or for information about parts or
service, contact your local Hearthstone dealer.
