Hearth Sense MO18HVL User manual

Questions, problems, missing parts?
Before returning to your retailer, call our customer service department at
1-866-573-0674, 8:00 am - 4:30 pm CST, Monday through Friday
WARNING: If the information in this manual is not
followed exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
— Do not store or use gasoline or other ammable va-
pors and liquids in the vicinity of this or any other
appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the re
department.
— Installation and service must be performed by a quali-
ed installer, service agency or the gas supplier.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
VENTED NATURAL GAS LOGS
MODELS
MO18HVL / MO24HVL
CSW18HVL/ CSW24HVL
PFS
®
US
MO24HVL SHOWN

HearthSense 200549-06B2
TABLE OF CONTENTS
Specications ............................................ 3
Safety ........................................................ 3
Product Features....................................... 5
Local Codes............................................... 5
Unpacking.................................................. 5
Air For Combustion and Ventilation........... 6
Installation ................................................. 6
Operation................................................. 13
Inspecting Burners................................... 15
Care and Maintenance ............................ 16
Accessories ............................................. 16
Troubleshooting....................................... 17
Replacement Parts.................................. 18
Parts ........................................................ 19
Warranty .................................................. 22
This is a gas-red appliance. It uses air (oxygen) from
the room in which it is installed. Provisions for adequate
combustion and ventilation air must be provided. Refer
to Air For Combustion and Ventilation section on page
6 of this manual.
WARNING: Improper installation, adjustment, al-
teration, service or maintenance can cause injury or
property damage. Refer to this manual for correct in-
stallation and operational procedures. For assistance
or additional information consult a qualied installer,
service agency or the gas supplier.
This appliance may be installed in an aftermarket,* per-
manently located, manufactured (mobile) home, where
not prohibited by local codes.
This appliance is only for use with type of gas indicated
on the rating plate. This appliance is not convertible for
use with other gases unless a certied kit is used.
* Aftermarket: Completion of sale, not for purpose of resale, from the
manufacturer.
SAVE THIS BOOK

HearthSense 3200549-06B
SPECIFICATIONS
Note: This vented appliance must be installed
only in a solid-fuel burning replace with a
working ue and constructed of noncombus-
tible material.
The charts indicate technical information
regarding the installation of your gas log set.
Please make sure that all of the specications
shown are applicable before installation is
attempted.
The replace must include a working ue and
venting system with the minimum openings
shown as below.
Model MO18HVL /
CSW18HVL
MO24HVL /
CSW24HVL
Gas Type Natural Natural
BTU Input* 45,000 BTU/Hr 55,000 BTU/Hr
Minimum Vent Opening 8" Diameter 8" Diameter
Burner Orice (Propane)** 205 225
* Btu/Hr Rating is the same when unit is converted to Propane gas.
** Number is printed on orice.
MINIMUM FIREBOX SIZES
Model Front
Width*
Back
Width * Depth Height
MO18HVL /
CSW18HVL 24" 18" 15" 18"
MO24HVL /
CSW24HVL 28" 22" 15" 18"
FUEL INLET PRESSURE SPECIFICATIONS (W.C.)
Natural Gas Minimum 5.5" W.C. Maximum 10.5" W.C.
Propane Gas* Minimum 11" W.C. Maximum 13" W.C.
* Add 4 in. when using on/o󰀨 valve safety pilot kit
* For use if unit is converted to Propane gas.
SAFETY
IMPORTANT: Read this owner’s
manual carefully andcompletely
before trying to assemble, op-
erate, or service this heater.
Improper use of this heater can
cause serious injury or death
from burns, fire, explosion,
electrical shock and carbon
monoxide poisoning.
Only a qualied installer, service
agent, or local gas supplier may
install and service this product.
WARNING: Keep ue open
when operating unit.
Carbon Monoxide Poisoning: Early signs
of carbon monoxide poisoning resemble the
u, with headaches, dizziness or nausea. If
you have these signs, the heater may not
be working properly. Get fresh air at once!
Have heater serviced. Some people are
more a󰀨ected by carbon monoxide than oth-
ers. These include pregnant women, people
with heart or lung disease or anemia, those
under the inuence of alcohol and those at
high altitudes.
Natural Gas: Natural gas is odorless. An
odor-making agent is added to the gas. The
odor helps you detect a gas leak. However,
the odor added to the gas can fade. Gas may
be present even though no odor exists.

HearthSense 200549-06B4
WARNING: Any change to
this log set or its controls can
be dangerous.
WARNING:This appliance is
for installation only in a solid-
fuel burning masonry or factory-
built replace, constructed of
noncombustible material, and
connected to a working ue.
1. This appliance, as supplied, is only for
use with the type of gas indicated on the
rating plate. This appliance is convertible
for use with propane, using the manual
ON/OFF safety pilot valve kit.
2. If you smell gas:
• Shut o󰀨 gas supply
• Do not try to light any appliance
• Do not touch any electrical switches; do
not use any phone in your building
• Immediately call your gas supplier from
a neighbor's phone. Follow the gas sup-
plier's instructions
• If you cannot reach your gas supplier,
call the re department
3. Never install the log set:
• In a recreational vehicle
• Where curtains, furniture, clothing, or
other ammable objects are less than
42" from the front, top, or sides of the
log set
• In high tra󰀩c areas
• In windy or drafty areas
4. Before installing in a solid fuel burning
replace, the chimney ue and re-box
must be cleaned of soot, creosote, ashes
and loose paint by a qualied chimney
cleaner. Creosote will ignite if highly
heated. Inspect chimney ue for damage.
5. You must operate this log set with a re-
place screen in place. Make sure replace
screen is closed before running log set. If
the replace has glass doors, they must
remain OPEN while this log set is in op-
eration.
SAFETY
6. This log set is designed to be smokeless.
If logs ever appear to smoke, turn o󰀨 ap-
pliance and call a qualied service person.
Note: During initial operation, slight smok-
ing could occur due to log curing and
the burning of manufacturing residues.
You may wish to add more ventilation by
opening a window.
7. Do not allow fans to blow directly into the
replace. Avoid any drafts that alter burner
ame patterns. Ceiling fans can create
drafts that alter burner ame patterns.
Altered burner patterns can increase
sooting.
8. Do not use a blower insert, heat exchang-
er insert, or other accessory not approved
for use with this log set.
9. This log set needs fresh, outside air
ventilation to run properly. See the Air for
Combustion and Ventilation, page 6.
10. Do not run log set
• where ammable liquids or vapors are
used or stored
• under dusty conditions
11. Do not burn solid fuel in the replace after
installing the log set. Do not use this log
set to cook food or burn paper or other
objects.
12. Log set becomes very hot when in use.
Keep children and adults away from hot
surface to avoid burns or clothing ignition.
Log set will remain hot for a short time
after shut-down. Allow surface to cool
before touching.
13. Carefully supervise young children when
they are in the room with log set.
14. Do not use appliance if any part has been
exposed to or under water. Immediately
call a qualied service technician to in-
spect the room appliance and to replace
any part of the control system (if using
control system) and any gas control which
has been under water.
15. To help prevent breakage, new logs must
go through the curing process (see Curing
Logs, page 12).
16. Turn log set o󰀨 and let cool before servic-
ing, installing, or repairing. Only a qualied
service person should install, service, or
repair log set.

HearthSense 5200549-06B
PRODUCT FEATURES
ON/OFF SAFETY PILOT VALVE KIT WITH PROPANE CONVERSION
An optional on/o󰀨 valve/safety pilot kit, Model NVDWA2, is available to convert this appliance
for use with propane gas. This system requires no matches, batteries, or other sources to
light. Follow the instructions provided with the kit to complete the conversion and qualied
connection to a propane gas supply, See Check Gas Type under INSTALLATION, on page 6.
Install and use heater with care. Follow all
local codes. In the absence of local codes,
use the latest edition of The National Fuel
Gas Code, ANSI Z223.1/NFPA 54*.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
1 Batterymarch Park
Quincy, MA 02269-9101
LOCAL CODES
State of Massachusetts: The installation
must be made by a licensed plumber or
gas tter in the Commonwealth of Mas-
sachusetts.
Sellers of unvented propane or natural
gas-red supplemental room heaters shall
provide to each purchaser a copy of 527
CMR 30 upon sale of the unit.
In the State of Massachusetts the gas
cock must be a T-handle type. The State
of Massachusetts requires that a exible
appliance connector cannot exceed three
feet in length.
UNPACKING
CAUTION:Do not remove the
metal data plates from the burner
pan. The data plates contain
important product information.
1. Remove logs, hearth kit, pan materials,
and hardware from carton.
2. Remove all protective packaging applied
to logs and base for shipment.
3. Check all items for any shipping damage.
If damaged, promptly inform dealer where
you bought the product.
Figure 1 - Product Identication
Grate
Grate Steps
Burner
Pan
Burner
Clamp Burner
Manifold Burner Inlet
Fitting

HearthSense 200549-06B6
AIR FOR COMBUSTION AND VENTILATION
WARNING:Iftheareainwhich
the heater may be operated does
not meet the required volumefor
indoor combustion air, combus-
tion and ventilation air shall be
provided by one of the methods
described in the National Fuel
Gas Code, ANSI Z223.1/NFPA
54, the International Fuel Gas
Code, or applicable local codes.
Today's homes are built more energy e󰀩cient
than ever. New materials, increased insula-
tion, and new construction methods help
reduce heat loss in homes. Home owners
weather strip and caulk around windows and
doors to keep the cold air out and the warm air
in. During heating months, home owners want
their homes as airtight as possible.
While it is good to make your home energy
e󰀩cient, your home needs to breathe. Fresh
air must enter your home. All fuel-burning ap-
pliances need fresh air for proper combustion
and ventilation.
Exhaust fans, replaces, clothes dryers, and
fuel burning appliances draw air from the
house to operate. You must provide adequate
fresh air for these appliances. This will en-
sure proper venting of vented fuel-burning
appliances.
WARNING: Before installing
in a solid fuel burning replace,
the chimney ue and rebox
must be cleaned of soot, creo-
sote, ashes, and loose paint by
a qualified chimney cleaner.
Creosote will ignite if highly
heated. A dirty chimney ue may
create and distribute soot within
the house. Inspect chimney ue
for damage.
NOTICE: Installation, service, and repair
of this appliance must be performed by a
qualied installer, service agency, company
or gas supplier experienced with this type of
gas appliance. Only factory authorized com-
ponents listed in these instructions may be
used in accordance with the manufacturer's
instructions and all codes and requirements
of the authority having jurisdiction. Any
modications to this kit, or use of unauthorized
components, or accessory items, will void the
manufacturer's warranty, and may result in a
hazardous condition.
CAUTION: Do not remove
themetal data plates attachedto
the burner pan. The data plates
contain important warranty in-
formation.
INSTALLATION
CHECK GAS TYPE
Use only natural gas. If your available supply is propane gas, you must install an NVDWA2
On/O󰀨 Safety Pilot Valve Kit (see Accessories, page 14). Once conversion is completed mark
with an "X" in the box shown on the Propane Conversion tag provided, to indicate that your
model has been converted for use with propane gas.
If the replace does not have a gas supply shuto󰀨 valve, one must be installed.
The replace chimney ue and vent must be
drafting properly. To check the vent for proper
drafting, light a tightly rolled newspaper on
one end and place it at the inside front edge of
the replace. Observe the smoke and be sure
the vent is properly drawing it up the chimney.
If the smoke spills out into the room, extin-
guish the ame and remove any obstruction
until proper venting is achieved. The chimney
ue must remain open a minimum of 3" at
all times during the operation of this log set.
VENTING SPECIFICATIONS FOR INSTALLATION

HearthSense 7200549-06B
INSTALLING DAMPER CLAMP
Secure the damper stop clamp provided to
the leading edge of the damper as shown in
Figure 2. If for any reason this clamp doesn't
work on your replace, another suitable clamp
or permanent stop must be installed, or the
damper blade must be cut or removed.
INSTALLATION
Figure 2 - Attaching Damper Clamp
Masonry Fireplace Manufactured
Fireplace
Damper Damper
Damper
Damper
Clamp
HEARTH KIT ASSEMBLY
Note: The following instructions apply to
dual ame "U" style burners. Be sure all pipe
threaded connections are tight, and have
thread compound to prevent leaks.
1. Determine which side the gas line will be
coming into the replce.
Gas line is on the right side. This unit
is manufactured with the gas inlet on the
right side of the burner pan. See Installa-
tion and Gas Connection, page 8.
Gas line is on the left side. If your gas
line will be coming into the replace from
the left side, continue with step 2.
2. Using a screwdriver, remove cover plate
on left side of burner pan (see Figure 3).
3. Unscrew burner inlet tting from burner
manifold (see Figure 3).
4. Place burner manifold in pan with thread-
ed opening facing opening on left side.
5. Using thread sealant (resistant to the ac-
tion of natural gas) on larger end of tting,
screw the burner inlet tting through hole
and into burner manifold. Tighten using a
wrench.
6. Using burner clamp, screw, and nut pro-
vided, assemble clamp to pan. This will
hold the burner manifold in place.
7. Using screws removed in step 2, install
cover plate over opening on right side of
burner pan.
8. If using optional control system kit, follow
instructions included with kit for installa-
tion and operation.
Burner Pan
Assembly (Facing
Front of Fireplace)
Figure 3 - Installing Burner
Nut
Washer
Burner
Manifold
Burner
Clamp
Cover
Plate
Burner Inlet
Fitting
Screw

HearthSense 200549-06B8
INSTALLATION
Installation and Gas Connection
1. Place the burner pan assembly in the
center of the replace oor. Make sure
the front of pan faces forward.
2. Thread the gas supply tting to the re-
place gas supply pipe. Use thread sealant.
3. Install adapter tting onto the burner inlet
tting using thread sealant on male threads
of burner inlet tting (see Figure 4).
4. Install the gas connector tube to the gas
supply tting. Carefully shape tube to at-
tach to adapter tting. Figure 4 - Connecting Gas to Appliance
Burner Pan Assembly
(Facing Front of
Fireplace)
Adapter Fitting
Gas
Connector
Tube
CONNECTION TO GAS SUPPLY
WARNING: A qualied ser-
vice person must connect log
set to gas supply. Follow all
local codes.
Installation Items Needed
Before installing log set, make sure you have
the items listed below.
• piping (check local codes)
• sealant (resistant to natural gas)
• equipment shuto󰀨 valve
• test gauge connection
• adjustable (crescent) wrench or pliers
• sediment trap
• tee joint
• pipe wrench
CAUTION: Only use a new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of
1/2" diameter or greater to allow
proper gas volume to log set. If
pipe is too small, loss of pres-
sure will occur.
Installation must include an equipment shut-
o󰀨 valve, union, and plugged 1/8" NPT tap.
Locate NPT tap within reach for test gauge
hook up. NPT tap must be upstream from log
set (see Figure 5).
IMPORTANT: Install equipment shuto󰀨 valve
in an accessible location. The equipment
shuto󰀨 valve is for turning on or shutting o󰀨
the gas to the appliance.
Apply pipe joint sealant lightly to male threads.
This will prevent excess sealant from going
into pipe. Excess sealant in pipe could result
in a clogged burner injector.
Install sediment trap in supply line as shown
in Figure 5. Locate sediment trap where it is
within reach for cleaning. Locate sediment
trap where trapped matter is not likely to
freeze. A sediment trap traps moisture and
contaminants. This keeps them from going
into log set controls. If sediment trap is not
installed or is installed incorrectly, log set may
not run properly.
Figure 5 - Gas Connection
Approved Flexible Gas Hose
(if allowed by local codes)
CSA Design - Certied
Equipment Shuto󰀨 Valve
with 1/8" NPT Tap*
3" Minimum
From Gas Meter
(5" W. C.**
to 10.5" W. C.)
pressure
Sediment Trap
Cap Pipe Tee
Nipple Joint
* Purchase the optional
CSA design-certified
equipment shuto󰀨 valve
from dealer. See Acces-
sories page 13.
** Minimum inlet pres-
sure for purpose of input
adjustment.

HearthSense 9200549-06B
INSTALLATION
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping
and connections for leaks after
installing or servicing. Correct
all leaks immediately.
WARNING: Never use an
open ame to check for a leak.
Apply a noncorrosive leak detec-
tion uid to all joints. Bubbles
forming show a leak. Correct all
leaks immediately.
PRESSURE TESTING GAS SUPPLY PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG ( 3.5kPa )
1. Disconnect heater with its appliance main
gas valve (control valve) and equipment
shuto󰀨 valve from gas supply piping sys-
tem. Pressures in excess of 1/2 PSIG will
damage heater regulator.
2. Cap o󰀨 open end of gas pipe where equip-
ment shuto󰀨 valve was connected.
3. Pressurize supply piping system by either
using compressed air or opening gas sup-
ply tank valve.
4. Check all joints of gas supply piping sys-
tem. Apply a noncorrosive leak detection
uid to gas joints. Bubbles forming show
a leak.
5. Correct all leaks immediately.
6. Reconnect log set and equipment shuto󰀨
valve to gas supply. Check reconnected
ttings for leaks.
Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)
1. Close equipment shuto󰀨 valve (see Fig-
ure 6).
2. Pressure supply piping system by either
using compressed air or opening gas
supply tank valve.
3 Check all joints from gas meter to equip-
ment shuto󰀨 valve (see Figure 7). Apply
a noncorrosive leak detection uid to gas
joints. If bubbles form, there may be a
leak.
4. Correct all leaks immediately.
Figure 6 - Equipment Shuto Valve
Open
Closed
Equipment
Shuto󰀨 Valve
Figure 7 - Checking Gas Joints
Equipment Shuto󰀨 Valve
Gas Meter

HearthSense 200549-06B10
INSTALLATION
TESTING BURNER FOR LEAKS
WARNING: Never check for
gas leaks with open ame.
1. Generously apply a noncorrosive leak
detection uid to all connections.
2. Light the burner with the shuto󰀨 valve, no
more than half open, and holding a match
slightly in front of the pan (see Lighting
Instructions, page 12).
3. Inspect all connections for bubbles,
raw gas odor, or ame from any area
other than the burner (leaks). If leaks are
detected, shut o󰀨 the gas valve immedi-
ately. Tighten, or reassemble the loose
connection(s) using pipe joint compound
until burner system is leak free.
4. When the burner is tested and leak free,
observe the individual tongues of ame
on the burner.
Note: Let the burner manifold cool rst
before removing to unclog port blockages.
The burner design includes more ports
on the outside of the bar. Make sure that
all ports are clear and producing ame
evenly across the burner. If any ports
appear blocked, clear them by removing
the burner manifold and reaming the ports
with a modied paper clip or other suit
able tool.
5. When nished testing, turn the gas shuto󰀨
valve OFF to extinguish all ames.
INSTALLING LOGS
WARNING: Failure to posi-
tiontheparts in accordance with
these diagrams or failure to use
only parts specically approved
with this appliance may result
in property damage or personal
injury.
Glowing Embers
Vermiculite
1. Place vermiculite into burner pan. Pull glowing ember loosely, and sprinkle uniformly on
the surface of vermiculite. Once complete, place the log grate over the burner pan and
assemble the rear grate steps onto the log grate.
It is very important to install the logs exactly
as instructed. Do not modify logs. Use only
logs supplied with heater.
Each log is marked with a number. This
number will help you to identify the logs when
installing.
After installing logs, add decorative cinders
around the grate base, do not place any
decorative cinders on logs or burner.
FILLING THE PAN BURNER
Grate Steps
Log Grate

HearthSense 11200549-06B
INSTALLATION
MODEL CSW18HVLMODEL MO18HVL
INSTALLING LOGS
Log #
SH-15
Log #
SH-16
Log #
SH-17
Log #
SH-18
Log #
SH-19
Log #
SH-20
Log #
SH-21
Log #
SH-30
Log #
SH-31
Log #
SH-29
Log #
SH-32
Log #
SH-33
Log #
SH-34
Log #
SH-35

HearthSense 200549-06B12
INSTALLING LOGS
INSTALLATION
MODEL CSW24HVLMODEL MO24HVL
Log #
SH-22
Log #
SH-23
Log #
SH-24
Log #
SH-25
Log #
SH-26
Log #
SH-27
Log #
SH-28
Log #
SH-36
Log #
SH-38 Log #
SH-37
Log #
SH-39
Log #
SH-40
Log #
SH-41
Log #
SH-42
Log #
SH-43

HearthSense 13200549-06B
OPERATION
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING: If you do not fol-
low these instructions exactly, a
re or explosion may result caus-
ing property damage, personal
injury or loss of life.
A. This appliance has a pilot which must
be lighted by hand. When lighting the
pilot, follow these instructions exactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell
next to the oor because some gas is
heavier than air and will settle on the oor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do
not use any phone in your building.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier,
call the re department.
C. Use only your hand to push in or turn
the gas control knob. Never use tools.
If the knob will not push in or turn by
hand, don’t try to repair it, call a qualied
service technician. Force or attempted
repair may result in a re or explosion.
D. Do not use this appliance if any part
has been under water. Immediately call
a qualied service technician to inspect
the appliance and to replace any part of
the control system and any gas control
which has been under water.
MANUAL LIGHTING INSTRUCTIONS
1. STOP! Read the safety information above.
2. Turn the gas shuto󰀨 valve to OFF.
3. Wait ve (5) minutes to clear out any
gas. If you still smell gas, STOP! Follow
the safety information above. If you don't
smell gas, go on to the next step.
4. Light a match and lay it on top of the pan
material about 2" from the end of the sup-
ply side of the pan.
5. Slowly turn the gas shuto󰀨 valve ON until
the burner ignites. If the burner doesn't
ignite within 10 seconds with the match
burning, turn the shuto󰀨 valve OFF and
repeat steps 1 through 4 again.
GAS SHUTOFF VALVE OPERATION
Flame Adjustment
Adjust the ame ON/OFF by turning the gas
shuto󰀨 valve counterclockwise to open
or clockwise to close, as necessary.
Shutting Off Appliance
Turn gas shuto󰀨 valve clockwise to the
OFF position.
CURING LOGS
During the 2-3 hour appliance curing period,
you may detect an odor from the appliance
as the various paints and compounds used in
the manufacturing of this log set cure. This is
a normal and temporary situation that is not
cause for alarm. However, you may want to
provide extra ventilation to the room during
this time.
To ensure proper curing of the logs:
• Ignite a 2" ame and maintain it for 1 hour.
• Burn the logs in consecutive 1 hour periods
raising the ame an additional 2" to full
ame height for a total of three hours.
NOTICE:Duringinitialoperation,
logs will give o󰀨 a paper-burning
smell. Orange ame may also
be present. This will only last a
few hours.

HearthSense 200549-06B14
1. STOP! Read the safety information
above and top of page 13.
2. Make sure control knob is in the OFF
position. If not, push knob in slightly and
turn clockwise to the OFF position.
NOTE: Manual control knob cannot be
turned from PILOT to OFF unless knob is
pushed slightly. Do not force.
3. Make sure equipment shuto󰀨 valve is
fully open.
4. Wait 5 minutes to clear out any gas.
Then smell for gas around appliance and
near the oor. If you smell gas, STOP!
Follow "B" in the safety information, page
13. If you do not smell gas, go to the next
step.
5. Push in control knob slightly and turn
counterclockwise to the PILOT
position. Keep control knob pressed in for
ve seconds.
Note: The rst time the appliance is oper-
ated after connecting the gas supply, the
control knob should be pressed for about
30 to 60 seconds. This will allow air to
bleed from the gas system. If pilot does not
stay lit, refer to Troubleshooting, pages 17
through 18. Also contact a qualied service
technician or gas supplier for repairs. If the
ignitor or electrode are not working properly
and until repairs are made, light pilot with
match.
• If control knob does not pop up when
released, contact a qualied service tech-
nician or gas supplier for repairs.
6. With control knob pressed in, push
down and hold ignitor button for a few
seconds. This will light the pilot. The pilot
is attached to the side of the burner. If
needed keep pressing ignitor button until
pilot lights.Note: If pilot does not stay
lit, refer to Troubleshooting, pages 17
through 18. Also contact a qualied ser-
vice technician or gas supplier for repairs.
To light pilot with match, see Manual
Lighting Procedure, page 15.
WARNING:Itisrecommended
that you operate this appliance
with the replace screen in place.
Make sure screen is installed
before running appliance.
LIGHTING INSTRUCTIONS
(IF USING NVDWA2 PILOT KIT)
7. Keep control knob pressed in for 30
seconds after lighting pilot. After 30 sec-
onds, release control knob. If control knob
does not pop up when released, contact a
qualied service person or gas supplier for
repairs.
Note: "If pilot goes out, repeat steps 3
through 7. This appliance has a safety in-
terlock system. Wait one (1)minute before
lighting pilot again.
8. To light the burner, partially press down
the control knob slightly and rotate coun-
terclockwise . Release the downward
pressure on the knob while continuing to
turn until the knob locks in the ON position.
The main burner should ignite. Do not
operate between locked positions.
9. Make sure replace screen is in place
before operating appliance.
10. If appliance will not operate, follow the
instructions To Turn O󰀨 Gas To Appliance,
page 15, and call your service technical or
gas supplier.
CAUTION: The NVDWA2
appliance pilot safety valve
may be used to adjust the ame
heating levels. Do not try to
adjust heating levels by using
the manual supply shuto󰀨 valve.
Figure 8 - Pilot

HearthSense 15200549-06B
INSPECTING BURNERS
IMPORTANT: Owner's should check pilot ame pattern and burner ame pattern often.
Incorrect ame patterns indicate the need for cleaning.
WARNING: Only a qualied service person should service and
repair replace. This includes maintenance requiring replacement
or alteration of components.
BURNER FLAME PATTERN
The burner ames should rise approximate-
ly 3" to 6" above the burner.
Figure 9 shows a correct burner ame pat-
tern. Figure 10 shows an incorrect burner
ame pattern
(actual logs will vary from those shown). If
burner ame pattern is incorrect then:
• turn replace o󰀨 (see Gas Shut O󰀨 Valve
Operation, page 13 or To Turn O󰀨 Gas to
Appliance, page 15).
• see Troubleshooting pages 17 through 18
BURNER PRIMARY AIR HOLES
Air is drawn into the burner through the holes in the tting at the entrance to the burner.
These holes may become blocked with dust or lint. Periodically inspect these holes for any
blockage and clean as necessary. Blocked air holes will create soot.
Shutting O󰀨 Appliance
1. Push in control knob slightly and turn
clockwise to the OFF position. Do
not force.
2. Close equipment shuto󰀨 valve.
Shutting O󰀨 Burner Only (pilot stays lit)
Push in and turn knob clockwise to
the PILOT position.
1. Open Fireplace Screen (If applicable).
2. Follow steps 1 through 7 under Lighting
Instructions, page 14.
3. With control knob in the PILOT position,
strike a match, and hold near pilot. Press
in control knob; pilot should light.
4. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob.
5. Make sure the replace screen is in place
before operating replace.
TO TURN OFF GAS TO APPLIANCE
(IF USING NVDWA2 PILOT KIT)
MANUAL LIGHTING INSTRUCTIONS
(IF USING NVDWA2 PILOT KIT)
Figure 9 - Correct Burner Flame Pattern Figure 10 - Incorrect Burner Flame
Pattern

HearthSense 200549-06B16
CARE AND MAINTENANCE
• Keep the area around the log set clean and clear of debris.
• Occasionally, you may use a soft bristle brush to clean logs.
• Once every year a qualied agency or certied chimney sweep should examine and clean
the venting system of the replace.
ACCESSORIES
Purchase these replace accessories from your local dealer. If they can not supply these
accessories, contact customer service department for information.
EQUIPMENT SHUTOFF VALVE
For all models. Equipment shuto󰀨 valve with
1/8" NPT tap. Fits 1/2" NPT pipe.
NVDWA2 - ON/OFF SAFETY PILOT
VALVE KIT
For all models. Required for propane
installation.
PILOT FLAME PATTERN (IF USING NVDWA2 PILOT KIT)
Figure 11 shows a correct and incorrect pi-
lot ame patterns. The incorrect pilot ame
is not touching the thermocouple. This will
cause the thermocouple to cool, which
shuts the replace o󰀨. There should not be
excessive ames present under pilot shield.
If unit has been converted to propane gas
and the pilot injector orice has not been
replaced, there will be excessive pilot
ames. Install propane injector orice if this
is the case.
If pilot ame pattern is incorrect, as shown
• turn replace o󰀨 (see To Turn O󰀨 Gas to
Appliance, page 15)
• see Troubleshooting pages 17 through
18.
Notice: Do not mistake orange ames with
yellow tipping. Dirt or other ne particles
enter the replace and burn causing brief
patches of orange ame.
INSPECTING BURNERS
Figure 11 - Pilot Flame Pattern

HearthSense 17200549-06B
TROUBLESHOOTING
WARNING: If you smell gas:
• Shut o󰀨 gas supply.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your
building.
• Immediately call your gas supplier from a neighbor’s phone. Fol-
low the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the re department.
WARNING: Only a qualied service technician should service and
repair heater. Make sure that power is turned o󰀨 before proceeding.
Turn o󰀨 and let cool before servicing.
CAUTION: Never use a wire, needle, or similar object to clean
pilot. This can damage the pilot unit.
IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning sup-
plies, paint, paint remover, cigarette smoke, cements and glues, new carpet or textiles, etc.,
create fumes. These fumes may mix with combustion air and create odors.
Note: All troubleshooting items are listed in order of operation.
Problem Possible Cause Corrective Action
Log set is smoking/ soot-
ing excessively
Note: It is natural and
unavoidable for vented
gas log sets to produce
moderate levels of car-
bon (soot) where ames
contact the logs.
1. Poor fuel quality.
2. Fireplace venting system not
drafting properly.
3. Excessive flame impinge-
ment or blockage.
4. Improper fuel/air mixture.
5. Excessive gas supply/ pres-
sure.
1. Contact local natural gas
company.
2. Adjust damper wide open
and/or have fireplace and
venting professionally
cleaned and checked.
3. Separate the logs to allow
more ame passage.
4. Remove any foreign items
from the ame pattern.
5. Preheat flue in very cold
weather.
Burner is excessively
noisy. Note: The move-
ment and combustion of
gas will create low, un-
avoidable levels of noise.
1. Passage of air/gas across
irregular surfaces.
1. Relieve any tight bends or
kinks in gas supply line.
Burner ame is too low or
too high.
1. Incorrect gas supply or pres-
sure.
2 Blocked burner orifice or
burner manifold ports.
3. Improper burner orice size.
1. Check for proper gas supply
pressure.
2. Free burner orice and mani-
fold ports of any burrs, paint,
or other blockage.
3. Verify proper burner orice
sizing (see page 3).

HearthSense 200549-06B18
Problem Possible Cause Corrective Action
Log set produces a click-
ing/ticking noise just after
burner is lit or shut o󰀨.
1. Metal expanding while heat-
ing or contracting while cool-
ing.
1. This is common with most
log sets. If noise is exces-
sive, contact qualied ser-
vice person.
Log set produces un-
wanted odors.
1. Log Set burning vapors
from paint, hair spray, glues,
cleaners, chemicals, new
carpet, etc. (See IMPOR-
TANT statement page 17).
2. Gas leak. See Warning
statement page 13.
1. Open ue to maximum. Stop
using odor causing products
while log set is running.
2. Locate and correct all leaks
(see Checking Gas Connec-
tions, page 9).
Gas odor even when
control knob is in OFF
position.
1. Gas leak. See Warning
statement page 13.
2. Control valve defective
1. Locate and correct all leaks
(see Checking Gas Connec-
tions, page 9).
2. Replace control valve.
Gas odor during com-
bustion.
1. Gas leak. See Warning
statement at top of page 13.
1. Locate and correct all leaks
(see Checking Gas Connec-
tions, page 9).
TROUBLESHOOTING
REPLACEMENT PARTS
Contact authorized dealers of this product.
If they can’t supply original replacement
parts, call Customer Service toll free at
1-866-573-0674 for referral information.
When calling Customer Service or your
dealer, have ready:
• Your name
• Your address
• Model and serial number of your heater
• How heater was malfunctioning
• Type of gas used (Propane or Natural Gas)
• Purchase date
Usually, we will ask you to return the defective
part to the factory
PARTS NOT UNDER
Note: Use only original replacement parts. This will protect your warranty coverage for parts
replaced under warranty.
PARTS UNDER WARRANTY
WARRANTY
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s) call Customer Service toll free at
1-866-573-0674 for referral information.
When calling Customer Service have ready:
• Model number of your heater
• The replacement part number

HearthSense 19200549-06B
PARTS
MODELS MO18HVL / MO24HVL
CSW18HVL/ CSW24HVL
4
4
1
2
35
6

HearthSense 200549-06B20
PARTS
This list contains replaceable parts used in your heater. When ordering parts, follow the
instructions listed under Replacement Parts on page 18 of this manual.
ITEM MO24HVL CSW24HVL DESCRIPTION QTY
1BL050-02 BL050-02 3/8" Female x 1/2" Flare Adapter 1
2**WAL06-01 **WAL06-01 Injector Mounting 1
3**WAL07-02N **WAL07-02N Injector 1
4WAB18-01B WAB18-01B Grate Step 2
5BL050-04 BL050-04 Flexible Gas Line 1
6BL050-03 BL050-03 1/2" Female x 1/2" Flare Adapter 1
PARTS AVAILABLE - NOT SHOWN
WAL11-01 WAL11-01 Vermiculite 1
GLEMVERM25 GLEMVERM25 Glowing Embers 1
WAL13-01 WAL13-01 Damper Clamp 1
HSVL24-MO HSVL24-CSW Log Cluster 1
SH-22 SH-36 Log 1 1
SH-23 SH-37 Log 2 1
SH-24 SH-38 Log 3 1
SH-25 SH-39 Log 4 1
SH-26 SH-40 Log 5 1
SH-27 SH-41 Log 6 1
SH-28 SH-42 Log 7 1
N/A SH-43 Log 8 1
** Not a eld replaceable part.
ITEM MO18HVL CSW18HVL DESCRIPTION QTY
1BL050-02 BL050-02 3/8" Female x 1/2" Flare Adapter 1
2**WAL06-01 **WAL06-01 Injector Mounting 1
3**WAL07-01N **WAL07-01N Injector 1
4WAB18-01B WAB18-01B Grate Step 2
5BL050-04 BL050-04 Flexible Gas Line 1
6BL050-03 BL050-03 1/2" Female x 1/2" Flare Adapter 1
PARTS AVAILABLE - NOT SHOWN
WAL11-01 WAL11-01 Vermiculite 1
GLEMVERM25 GLEMVERM25 Glowing Embers 1
WAL13-01 WAL13-01 Damper Clamp 1
HSVL18-MO HSVL18-CSW Log Cluster 1
SH-15 SH-29 Log 1 1
SH-16 SH-30 Log 2 1
SH-17 SH-31 Log 3 1
SH-18 SH-32 Log 4 1
SH-19 SH-33 Log 5 1
SH-20 SH-34 Log 6 1
SH-21 SH-35 Log 7 1