HearthStone TDS93-56231 User manual

TDS93-56231 NG to LP Fuel Conversion Kit
For Stowe 8323
ATTENTION: THIS CONVERSION KIT MUST BE INSTALLED BY A QUALIFIED
SERVICE AGENCY.
This Liquid Propane (LP) fuel conversion kit is for use with the Hearthstone
Stowe 8323 only. This kit is suitable for installations at elevations up to 4500
feet above sea level. When converted for LP, it is not necessary to derate the
Stowe 8323 at elevations above 2000 feet.
Table –Settings and Specifications
Specification
NG
LP
INPUT RATING (Btu/hr) 0-2000 ft
22,400
22,400
INPUT RATING (Btu/hr) 2000-4500 ft
21000
22400
ORIFICE SIZE (DMS) 0-2000 ft
43
55
ORIFICE SIZE (DMS) 2000-4500 ft
44
55
MANIFOLD PRESSURE - LO SETTING (in.w.c./kPa)
1.2/0.30
4.1/1.02
MANIFOLD PRESSURE - HI SETTING (in.w.c./kPa)
3.4/0.85
10.4/2.59
INLET PRESSURE - MINIMUM (in.w.c./kPa)
5.0/1.25
12.0/2.99
INLET PRESSURE - MAXIMUM (in.w.c./kPa)
11.0/2.74
13.8/3.45
MINIMUM INPUT RATING LO SETTING (Btu/hr)
13,000
14,000

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Packing List
1 - main burner orifice, #55 (U.S.)
1 - valve orifice, #130 (metric)
1 - valve conversion key
1 - conversion label 3300-589
1 - conversion label 3300-583
1 - warning label 3300-585
1 - installation manual
Tools Required
Manometer
5/32” (4mm) hex key
Flat-head screwdriver, 1/4” bit
Flat-head screwdriver, 3/32” bit
Phillips screwdriver
7/16” wrench
1/4” wrench
Adjustable wrench
Socket wrench w/ 6” extension
1/2” deep-well socket
Instructions
CAUTION: THE GAS SUPPLY SHALL
BE SHUT OFF PRIOR TO
DISCONNECTING THE ELECTRICAL
POWER, BEFORE PROCEEDING
WITH THE CONVERSION.
LP conversion orifices are identified
by size stamped on side of part.
Ensure that orifice sizes are correct
before installation.
Note: Do NOT adjust and/or alter
any components marked with
tamper-indicating paint.
Figure 1 –Orifices, Marking
Locations
Convertible regulators are
designed to deliver either of two
fixed outlet pressures for Natural
Gas (NG) or LP Gas. To change
from one gas to the other, turn the
outlet pressure screw housing (see
Figure 2) counter-clockwise to
remove. Be careful not to engage
the small flat slot on the screw
itself but use the larger slot of the
screw housing to remove the unit.
Pull gently to remove the plastic
spacer, rotate it 180°, and then
slide it back onto the conversion
plug until it snaps into place.
Spacer is marked 'NG' at one end
and 'LP' at the other. In NG
configuration, 'NG' marking is
closest to threads, and brass pin of
conversion plug extends through
spacer. In LP configuration, 'LP'
marking is closest to threads, and
spacer extends beyond end of
conversion plug. With spacer in
correct position, reinstall the
conversion plug by screwing it
clockwise until snug. The low
pressure orifice must also be
changed (see Figures 3 –8).

3
To Switch the Valve to LP Operation:
Refer to Figures 3 –8
1. Remove the conversion plug
from the valve body.
2. Carefully and without turning
the adjusting screw, grasp the
plastic spacer at the end of the
pressure screw and remove it
from the shaft by gently
pulling away from the screw
head.
3. Flip the plastic spacer 1800, so
that ‘LP’ marking is closest to
threads.
4. Slid the conversion plug back
on to the pressure screw shaft
and gently push until it clicks
into place.
5. Reinstall the screw assembly
using only the outer screw
head slot for driving, and
tighten until seated fully in the
valve.
Figure 2 –GV60 LP Conversion
Steps
6. With 1/4” wrench, loosen the
valve mounting bracket (two
hex-head screws, front R and L
corners) and swing the front of
the valve assembly down.
7. With 5/32” hex wrench,
loosen and remove the
existing low pressure NG screw
by turning counter-clockwise
until it spins freely. It may be
necessary to grasp the screw
head with your fingernails or
gently pry it free of the valve
body with a small flat blade
screwdriver, as the screw has
an o-ring at the top that may
gently hold it in the valve body
even after threads are fully
loosened (see Figure 5).
8. Insert the #130 LP low
pressure orifice in the
receptacle, press firmly with
finger to compress o-ring and
engage threads, and tighten
using the enclosed tool. Turn
clockwise until orifice stops
turning to fully seat the orifice
body in the valve.
9. Swing the valve mounting
bracket back up into its
original position.
10. Tighten screws and ensure
valve bracket is firmly held in
position.

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Figure 3 –Valve Top View
A: Low Pressure Orifice, B:
Manifold Pressure Tap, C: Inlet
Pressure Tap
Figure 4 –Loosening
Figure 5 –Prying O-Ring
Figure 6 –NG Low Pressure Screw
Removal
Figure 7 –Press LP Orifice into
Valve to Compress O-ring
Figure 8 –Tighten LP Low Pressure
Orifice
To Switch Pilot to LP Operation:
Refer to Figures 9 –12
The pilot assembly in the Stowe
8323 is a slide convertible unit,
requiring only a 7/16” open-end
wrench for conversion. To convert
pilot from NG to LP:

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1. Open firebox and remove logs,
burner, and pilot shield. Refer
to Stowe 8323 main product
manual for guidance.
2. Using the 7/16” wrench, grasp
the pilot tower and turn
counter-clockwise about 1/4
turn (see Figure 28).
3. Look at the front edge of the
base of the pilot tower. You
will see the NG/LP Pilot Orifice
Gate protruding toward the
front of the pilot tower and
the letters “NAT” should be
visible on the upper horizontal
surface (see Figure 9). Slide
the gate backward in the Pilot
Tower by pushing on the
upturned edge by the “NAT”
lettering until the upturned
edge is flush with the Pilot
Tower surface. You will see
the NG/LP Pilot Gate
protruding from the back edge
of the Pilot Tower and the
letters “LP” will be visible,
separated by a punched hole.
4. While holding the NG/LP Pilot
Gate in the LP visible position,
grasp the Pilot Tower with the
7/16” wrench and turn
clockwise until the tower is
snug. The Pilot Hood should
be oriented such that one pilot
flame is directed at the
thermocouple and the other is
facing the main burner (see
Figure 11).
Figure 9 –Pilot in NG Position
Figure 10 –Loosen Tower and
Slide Pilot Gate to Rear of Pilot
Tower (LP Position)

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Figure 11 –Pilot in LP Position
To replace main burner orifice:
Using a 1/2” socket and extender,
grasp orifice hood and turn
counter-clockwise until loose and
remove. Replace with #55 LP
orifice hood, turning clockwise
until snug.
Figure 12 –Main Orifice Location
Reinstall burner, pilot shield, and
logs. Ensure that pilot, pilot shield
and burner are properly positioned
(see Figure 13). Reinstall front
glass, and front and top cast.
Figure 13 –Pilot, Shield, and
Burner Position
Checking for leaks:
To perform initial gas leak test:
1. Check carefully for gas leaks
immediately after the
conversion has been
performed. Do this before
attempting to operate the
appliance or other gas
burning device.
2. Use an approved non-
corrosive leak detection fluid,
or other approved leak
detection method, around the
diaphragm flanges, pipe
connections, seal cap, and all
other joints. Bubbles indicate
a leak.
3. If no leakage is detected,
proceed with the instructions
listed below to light the main
burner and perform a
secondary leak check of the
appliance gas supply system.
4. If a leak is detected, tighten
pipe connections (including
adapters) and retest.

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To perform secondary leak test:
1. Light stove. With the main
burner in operation, apply an
approved leak test solution to
all tubing, pipe connections ,
and adapters, and the valve
inlet and outlet. Bubbles
indicate a leak.
2. If no leak is detected,
appliance is safe to use.
3. If a leak is detected, tighten
pipe connections (including
adapters) and retest.
WARNING
Absolutely no leakage should occur,
otherwise there is a danger of fire
or explosion depending upon
conditions. Never use if leakage is
detected.
To light stove:
Stove is factory-set for use with
remote control. See main product
manual for manual lighting
instructions.
Remote Control Operation
• To light stove,
simultaneously
press the OFF
and large flame
buttons until a
short beep
confirms the
start sequence
has begun;
release buttons.
•Continuing
beeps confirm that ignition is in
progress.
•Once pilot ignition is confirmed,
valve will open to allow gas flow
to main burner.
•After main burner ignition, the
handset will automatically go
into manual mode.
•After main burner ignition,
stove is automatically set to
maximum manifold
pressure/flame level.
•To set stove to minimum
pressure/flame level, double-
click small flame button. To
return to maximum
pressure/flame, double-click
large flame button.
•To turn stove off, press OFF
button. To prevent reignition,
remove access panel and set
I/O power switch to O.
Adjustment for proper pilot and
main burner appearance:
Pilot Adjustment
CAUTION: THE PILOT FLAME
SHOULD ONLY BE ADJUSTED BY
AN AUTHORIZED SERVICE
TECHNICIAN.
The pilot flow adjustment is preset
to maximum at the factory. The
pilot flame should envelop 3/8” to
1/2” of the thermocouple (see
Figure 14). If the pilot flame is too
small or directed away from the
thermopile, the Stowe may
operate erratically, fail to light, or
go out.

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To adjust pilot:
1. The adjustment screw can be
reached through a hole in the
MANUAL knob (see Figure 15).
2. Turn the MANUAL knob to the
ON position.
3. It is now possible to pierce
through a film on the cover
with a screwdriver to reach
the adjustment screw beneath.
4. Turn the adjustment screw
clockwise to decrease or
counter-clockwise to increase
pilot flame.
Figure 14 - Pilot Flame Pattern
Figure 15 - Pilot and Burner
Adjustment
Main Burner Adjustment
The appearance of the main burner
flame may be adjusted by adjusting
the primary air shutter and vent
restrictor. For use with LP, these
should be set to their fully open
settings, and only adjusted if
necessary to achieve a pleasing
flame appearance. To determine if
the burner flame needs
adjustment, view the flame pattern
with the valve output at its highest
setting. Allow unit to operate for
10 minutes to allow the flame
pattern to stabilize, then observe
flame pattern and adjust as
necessary. A periodic visual check
of the burner flame should be
performed. Flame pattern should
resemble Figure 16. There are
several guidelines to aid in
determining if the flame pattern is
correct:
1. Flames should not be dirty,
smoky, sooty, or lick the top of
the stove.
2. Flames should not rise off the
pan burner; this is called
“lifting”.
3. Flames should not impinge
heavily on logs. They should
“fit” through the pre-formed
spaces designed in the log set.
Generally, the more air (open
shutter), 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
sooting. There are two simple
guidelines to aid in determining
the correct flame pattern:
1. If the flame just above the

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surface of the burner or at the
base of the logs is completely
blue, the air shutter may be
open too far.
2. If flame is dirty, sooty, or licks
the top of the baffle, the air
shutter may be closed too far.
3.
Note: 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
setting. 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.
Figure 16 –Typical Burner Flame
Appearance
Air Shutter Adjustment
CAUTION: ADJUSTING ROD IS HOT!
WARNING: ONLY A QUALIFIED GAS
TECHNICIAN SHOULD MAKE
ADJUSTMENTS TO THE AIR
SHUTTER.
The air shutter is adjustable while
the stove is burning. Loosen the set
screw on the adjusting rod located
in the lower rear center of the
stove. Move the rod in or out to
adjust the flame pattern (see
Figures 17 and 18). Push the rod in
to open the air shutter, and pull it
out to close the shutter. When the
flame pattern is correct, tighten
the set screw without letting the
rod move.
Figure 17 –Air Shutter Open
Figure 18 –Air Shutter Closed
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

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attempt to complete any part of
the installation or adjustment of
this unit unless technically
qualified to do so.
Restrictor Plate
The restrictor plate is used to
control excess draft if necessary.
Controlling the draft also changes
the aesthetics of the flame. The
restrictor plate has a large range of
possible settings (See Figure 19).
The adjustment point is on the left
side of the firebox (from front).
Restrictor Plate Position
The restrictor plate is factory set in
the fully open position for shipping.
This ensures proper flames for a
wide variety of vent configurations
and efficiency. The restrictor plate
consists of a rotating flap in front
of the firebox exhaust port behind
the cast iron baffle plate.
Depending on your vent
configuration, you may need to
adjust the restrictor plate position
to reduce draft.
Restrictor Plate Adjustment
Loosen the screw and position the
restrictor plate in the desired
location. Tighten the screw to lock
in place.
Figure 19 –Restrictor Indicator
To verify input rate:
The approximate input rate of the
converted Stowe may be checked
as follows:
1. Ensure that no other gas
appliances are in operation.
2. Place Stowe in operation on
high, and allow to burn for 15
minutes.
3. Using residential gas meter,
measure the time in seconds
required for the Stowe to
consume 1 cubic foot of gas.
4. The gas consumption of the
Stowe in BTU per hour may be
calculated as (3,600 x heating
value of gas) ÷ seconds to
consume 1 cubic foot. Use
local gas supplier’s heating
value, or use 2,500 for LP or
1,012 for NG.
EXAMPLE: Using LP with a heating
value of 2,500, and a time of 392
seconds (6 minutes 32 seconds):
(3,600 x 2,500) ÷ 392 = 9,000,000 ÷
392 = 22,959 BTU per hour
Note: Stowe may operate safely up
to 105% of its rated input, or
23,520 BTU per hour. If Stowe
input is incorrect, it is necessary to
adjust 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.

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Checking gas pressures:
When installation is complete,
verify that inlet and manifold
pressures are correct. Pressure
taps are located on the side of the
valve body as shown (see Figure 3).
To verify inlet pressure, with stove
in operation, loosen threaded plug
of inlet pressure tap and connect
manometer. Retighten plug when
finished.
To verify manifold pressure, with
stove in operation, loosen
threaded plug of manifold pressure
tap and connect manometer.
Verify manifold pressures at both
high and low settings. Retighten
plug when finished.
To adjust manifold high pressure:
CAUTION: THE VALVE MAXIMUM
OUTLET PRESSURE SHOULD ONLY
BE ADJUSTED BY AN AUTHORIZED
SERVICE TECHNICIAN AND IS PRE-
SET AT THE FACTORY.
CAUTION: OUTLET PRESSURE
ADJUSTMENT REQUIRES THE USE
OF A MANOMETER. DO NOT
ATTEMPT TO ADJUST OUTLET
PRESSURE WITHOUT A
MANOMETER.
1. Connect a manometer to the
valve outlet pressure tap.
Pressure tap is opened by
turning the screw counter-
clockwise (see Figure 3).
2. Light stove and place main
burner in operation on high.
3. Turn pressure regulator
adjustment screw (see Figure
15) to set required burner
pressure. Pressure is increased
by turning clockwise (pressure
regulator models), or
decreased by turning counter-
clockwise.
Note: Pressure regulator
adjustment screw is marked with
tamper-indicating paint. Pressure
regulator adjustment screw must
be adjusted by an authorized
service technician. Do not adjust
unless necessary.
4. Verify that manifold pressure
is correct (see table, page 1).
If necessary, verify input rate.
5. If no other adjustments are
required, remove manometer
and close pressure tap(s) by
turning the screw(s) fully
clockwise until snug. Check all
connections/pressure tap(s)
for leaks.
6. If the desired outlet pressure
or flow cannot be achieved by
adjusting the gas valve, check
the gas valve inlet pressure
using a manometer at the
valve inlet pressure tap. If the
inlet pressure is in the normal
range, replace the gas valve;
otherwise, take necessary
steps to assure proper gas
pressure to the valve.
To adjust manifold low pressure:
CAUTION: THE MINIMUM VALVE
OUTLET PRESSURE SHOULD ONLY
BE ADJUSTED BY AN AUTHORIZED
SERVICE TECHNICIAN AND IS PRE-
SET AT THE FACTORY.

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1. Connect a manometer to the
valve outlet pressure tap.
Pressure tap is opened by
turning the screw counter-
clockwise (see Figure 3).
2. Light stove and place main
burner in operation on low.
3. For LP, the low rate is set by
installing a calibrated low
pressure orifice, included with
this kit. Once the Stowe has
been converted to LP with the
fixed rate low flow orifice, the
low rate is not adjustable. If
LP minimum pressure is not
within ±0.1 i.w.c. of specified
minimum pressure, ensure
that low pressure orifice is
properly seated in valve.
Conversion label placement:
When fuel conversion is complete,
fill out and apply included marking
labels to the appliance as shown.
Fill out all fields on large rating
plate conversion label 3300-589
(number in lower right corner) and
place over field provided on stove
lighting instruction tag (see Figure
20).
Figure 21 –Ash Lip Conversion
Label Location
Figure 20 –Rating Plate
Conversion Label Location
Fill out all fields on smaller ash lip
conversion label 3300-593 and
place on inside surface of ash lip
(see Figure 21).
Place small valve warning label
3300-585 on or near valve body
(see Figure 22).
Figure 22 –Valve Warning Label
Location