United States Stove Electric Heater A9740L User Manual

S
C
U S  
P
UNITED STATES STOVE COMPANY  
227 Industrial Park Road • P.O. Box 151 • South Pittsburg, TN 37380 • (423) 837-2100  
Natural Gas Model  
A9740N  
Propane (LPG) Model  
A9740L  
C9740N  
C9740L  
G9740N  
G9740L  
VENT-FREE PEDESTAL GAS HEATER  
INSTALLATION AND OPERATION INSTRUCTIONS  
This is an unvented gas-fired heater. It uses  
air(oxygen)fromtheroominwhichitisinstalled.  
Provisions for adequate combustion and  
ventilation air must be provided. Refer to  
"Adequate Combustion And Ventilation Air"  
on page 6 of this manual.  
WARNINGS  
WARNING: If the information in this manual is not  
followedexactly,afireorexplosionmayresultcausing  
property damage, personal injury or loss of life.  
Do not store or use gasoline or other flammable vapors  
and liquids in the vicinity of this or any other appliance.  
THIS APPLIANCE MAY BE INSTALLED IN  
AN AFTERMARKET* MANUFACTURED  
(MOBILE)  
HOME,  
WHERE  
NOT  
WHAT TO DO IF YOU SMELL GAS  
PROHIBITED BY STATE OR LOCAL  
CODES.  
• 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 fire  
department.  
*Aftermarket: Completion of sale, not  
for purpose of resale, from the  
manufacturer.  
Installation and service must be performed by a qualified  
installer, service agency or the gas supplier.  
THIS APPLIANCE IS ONLY FOR USE WITH  
THE TYPE OF GAS INDICATED ON THE  
RATING PLATE. THIS APPLIANCE IS NOT  
CONVERTIBLE FOR USE WITH OTHER  
GASES.  
WARNING: Do not use a blower insert, heat  
exchanger insert or other accessory not approved  
for use with this heater.  
851227C 9/98  
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IMPORTANT SAFETY INFORMATION  
INSTALLER: Please leave these instructions with the owner.  
OWNER: Please retain these instructions for future reference.  
IMPORTANT: Read these instructions carefully before installing or trying to operate this heater.  
WARNING: Any change to this heater or its controls can be dangerous. Improper  
installation or use of the heater can cause serious injury or death from fire, burns,  
explosion or carbon monoxide poisoning.  
1.  
2.  
CARBONMONOXIDEPOISONING:Earlysignsofcarbonmonoxidepoisoningaresimilartothefluwith  
headaches, dizziness and/or nausea. If you have these signs, obtain fresh air immediately. Have the heater  
serviced as it may not be operating properly.  
The installation must conform with local codes or, in the absence of local codes, with the National Fuel Gas  
Code, ANSI Z223.1.  
3.  
4.  
5.  
The 9740N/9740L vent-free gas heater system cannot be installed in a bedroom.  
Do not install the heaters in a bathroom.  
WARNING:Improperinstallation,adjustment,alteration,serviceormaintenancecancauseinjuryorproperty  
damage. Refer to this owner's manual. Installation and service must be performed by a qualified installer;  
service agency or the gas supplier.  
6.  
To prevent malfunction and/or sooting, an unvented gas heater should be cleaned at least annually by a  
professionalserviceperson.Morefrequentcleaningmayberequiredduetoexcessivelintfromcarpeting,etc.  
It is imperative that control compartments, burners and circulating air passageways be kept clean.  
7.  
8.  
Correctplacementoftheceramicfiberlogsisnecessarytoavoidproblemswithsooting.Sootingcansettleon  
surfacesoutsidetheheaterandcausediscoloration.Seetheappropriatesectionsofthismanualforinstructions.  
WARNING: Do not allow fans to blow directly into the fireplace. Avoid any drafts that alter burner flame  
patterns. Donotplaceablowerinsideburnareaoffirebox.Ceilingfansmaycreatedraftsthatalterburnerflame  
patterns. Sooting and improper burning will occur.  
9.  
This is an vent-free gas-fired heater. It uses air (oxygen) from the room in which it is installed. Provisions for  
adequate combustion and ventilation air must be provided. Refer to installation guidelines.  
10.  
Childrenandadultsshouldbealertedtothehazardofhighsurfacetemperatureandshouldstayawaytoavoid  
burns or clothing ignition.  
11.  
12.  
Young children should be carefully supervised when they are in the same room with the appliance.  
Do not place clothing or other flammable material near the appliance.  
3
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IMPORTANT SAFETY INFORMATION  
13.  
Keep appliance area clear and free from combustible materials, gasoline and other flammable vapors and  
liquids.  
14.  
15.  
Any safety screen or guard removed for servicing, must be replaced prior to operating the heater.  
This vent-free gas heater is intended to be smokeless. If logs appear to smoke, turn off the heater  
and call a qualified service person. Initial burn off may cause slight smoke and odor during the first  
four hours of operation.  
16.  
Input ratings are shown in BTU per hour and are for elevations up to 2,000 feet. For elevations  
above 2,000 feet, input ratings should be reduced 4 percent for each 1,000 feet above sea level.  
Refer to the National Fuel Gas Code.  
17.  
18.  
The heater and its individual shut off valve must be disconnected from the gas supply piping system  
during any pressure testing of that system at test pressures in excess of 1/2 psig (3.5 kPa).  
The heater must be isolated from the gas supply piping system by closing its individual manual  
shutoff valve during any pressure testing of the gas supply piping system at test pressures equal  
to or less than 1/2 psig (3.5 kPa).  
19.  
Do not use this room heater if any part has been under water. Immediately call a qualified service  
technician to inspect the room heater and to replace any part of the control system and any gas  
control which has been under water.  
PRODUCT FEATURES  
Features:  
• Heating Efficiency - 99.9%  
• Wide BTU Range: 10,000 - 39,900.  
• Safe Operation - Oxygen Depletion Sensor (ODS).  
• No Electricity Required.  
• Fibre Ceramic Logs.  
• Push-Button Piezo Ignitor.  
• Clean Operation.  
• Wide Bay Front.  
• Compact Design.  
• Easy Operation.  
• Heats up to 1,200 square feet.  
FIGURE 1. 9740 Vent-Free Pedestal  
Gas Heater.  
4
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SPECIFICATIONS  
Natural Gas  
Manifold Pressure Setting 4" w.c.  
Gas Inlet Pressure  
Maximum 10-1/2" w.c.  
Minimum 5" w.c.  
Number  
Gas Rate  
Max BTU/Hr Min BTU/Hr  
39,900 10,000  
Model Number  
9740N  
Type  
Manual  
of Burners  
2
Propane / LPG  
Note: An external regulator is required to reduce supply pressure to a maximum of 13" w.c.  
Manifold Pressure Setting 10" w.c.  
Gas Inlet Pressure  
Maximum 13" w.c.  
Minimum 11" w.c.  
Number  
Gas Rate  
Model Number  
9740L  
Type  
Manual  
Max BTU/Hr  
39,900  
Min BTU/Hr  
of Burners  
10,000  
2
Controls - Main control has 4 positions:  
1. OFF - All gas to the gas logs is shut off at the control  
2. IGN - Piezo ignitor allows ignition of the pilot without the use of matches or batteries  
3. PILOT - Valve position to light / maintain a standing pilot  
4. ON - Gas flow to complete system, front burner ignition  
Front Burner Control Knob - Infinite control, rotate clockwise to minimum rate and counter  
clockwise for maximum rate.  
Rear Burner Control Knob - Has 3 positions:  
1. OFF - Gas to rear burner is shutoff at control  
2. ON/MAX - Maximum gas flow to rear burner  
3. MIN - Minimum gas flow rate to rear burner  
CONTENTS  
9740L and 9740N Unvented Gas Heaters  
1. Packet containing Homeowners/Installation instructions.  
2. Log box containing four (4) fiber ceramic logs, refer to installation instructions.  
3. Unvented gas heater.  
CHECK THAT ALL LISTED PARTS HAVE BEEN RECEIVED  
GLOVES ARE RECOMMENDED WHEN HANDLING CERAMIC FIBER LOGS  
TO PREVENT SKIN IRRITATION FROM LOOSE FIBERS. LOGS ARE  
FRAGILE, HANDLE WITH CARE.  
Carefully inspect the contents for shipping damage and immediately inform your dealer if any damage is found.  
5
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ITEMS REQUIRED FOR INSTALLATION  
ITEMS REQUIRED FOR INSTALLATION  
Ensure that the following items are available before proceeding with installation:  
• External regulator (for propane/LPG only)  
• Piping which complies with local codes  
• Pipe sealant approved for use with  
• Manual shutoff valve  
• Sediment trap  
• Pipe wrench  
propane/LPG (resistant to sulfur compounds)  
CODES  
Adheretoalllocalcodesorintheirabsence, thelatesteditionofTHENATIONALFUELGASCODEANSIZ223.1  
or NFPA54 which can be obtained from:  
American National Standards Institute, Inc.  
1430 Broadway  
National Fire Protection Association, Inc.  
Batterymarch Park  
or  
New York, NY 10018  
Quincy, MA 02269  
Due to high temperatures, do not install the heater:  
• Where curtains, furniture, clothing or other flammable objects are less than 42"  
from the front of the heater.  
• In high traffic areas.  
• In windy or drafty areas.  
DO NOT PLACE CLOTHING OR OTHER FLAMMABLE MATERIAL ON OR NEAR THE  
APPLIANCE.  
ADEQUATE COMBUSTION AND VENTILATION AIR  
This heater shall not be installed in a confined space or unusually tight construction unless provisions are provided  
for adequate combustion and ventilation air.  
Unusually tight construction is defined as construction where:  
(a) Wallsandceilingsexposedtotheoutsideatmospherehaveacontinuouswatervaporretarderwitharating  
11  
2
of 1 perm (6 x 10½ kg per pa-sec-m ) or less with openings gasketed or sealed, and  
(b) Weather stripping has been added on openable windows and doors, and  
(c) Caulking or sealants are applied to areas such as joints around window and door frames, between sole  
plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical,  
and gas lines, and at other openings.  
The National Fuel Gas Code defines a confined space as a space whose volume is less than 50 cubic feet per 1,000  
BTU per hour (4.8m3per kw) of the aggregate input rating of all appliances installed in that space and an unconfined  
space is defined as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour (4.8m3per kw) of  
the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space  
in which the appliances are installed, through openings not furnished with doors, are considered a part of the  
unconfined space.  
6
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INSTALLATION  
Thefollowingformulacanbeusedtodeterminethemaximum  
heater rating per the definition of unconfined space:  
BTU/HR = (L1+L2) Ft x (W) Ft x (H) Ft x 1000  
50  
Consider two connecting rooms with an open area between,  
with the following dimensions:(See Fig. 3, Example)  
L1=15-1/2 Ft., L2=12 Ft., W=12 ft., H=8Ft  
50  
H (8')  
L2 (12')  
=52800 BTU/HR  
W (12')  
L1 (15-1/2')  
If there were a door between the two rooms the calculation  
would be based only on the room with the heater.  
BTU/HR=(15-1/2) x (12) x (8) x 1000  
50  
FIGURE 3.  
=29760 BTU/HR  
When installing the appliance directly on carpeting, tile or other combustible  
material, other than wood flooring, the appliance must be installed on a metal or  
wood panel extending the full width and depth of the appliance.  
If the area in which the heater may be operated is smaller than that defined as an  
unconfined space or if the building is of unusually tight construction, provide  
adequate combustion and ventilation air by one of the methods described in the  
National Fuel Gas Code, ANSI Z223.1, Section 5.3, or applicable local codes.  
Ensure the minimum clearances shown in FIGURE 4 are maintained for accessibility  
for purposes of servicing and proper operation. Left and right clearances are  
determined when facing the front of the heater.  
Maintain  
these  
clearances to ensure  
adequate space around  
air opening for proper  
operation.  
36"  
8"  
8"  
Minimum clearances to  
combustibles:  
42"  
Topofheater.................................36"  
Sidesofheater...............................8"  
Front of heater.............................42"  
Rearofheater................................4"  
4"  
FIGURE 4. Minimum Clearances  
7
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GAS CONNECTION  
A qualified gas appliance installer must connect the fireplace to the gas supply.  
Consult all local codes.  
Use new black iron or steel pipe only. Internally tinned copper tubing can be used  
in some areas when permitted by local codes. Only use pipe of 1/2" or greater  
diameter to allow full gas volume to heater. Excessive pressure loss will occur if the  
pipe is too small.  
A manual shutoff valve, union and plugged 1/8" NPT pressure tapping point must be  
installed upstream of the heater (FIGURE 5).  
A sediment trap must be installed upstream of the heater to prevent moisture and  
contaminants from passing through the pipe to the heater controls and burners.  
Failure to do so could prevent the heater from operating reliably (FIGURE 5).  
IMPORTANT: Loosen the pipe adapter  
on the flex tube before installing to the  
system piping.  
TO HEATER  
STAINLESS  
CONTROL VALVE  
FLEXIBLE TUBE  
PIPE  
MANUAL  
SHUTOFF VALVE  
PIPE  
COUPLING  
TEE JOINT  
SEDIMENT TRAP  
PIPE NIPPLE  
CAP  
FIGURE 5. Gas Connection  
CHECK GAS TYPE: The gas supply must be the same as stated on heater's rating plate. If the gas supply is  
different, DO NOT INSTALL the heater. Contact your dealer for the correct model.  
Connecting directly to an unregulated propane/LPG tank can cause an explosion.  
8
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GAS CONNECTION  
The gas inlet connection is 3/8" NPT, made at  
the rear of the main control through the area at  
the rear of the pedestal.  
Test all gas joints from the gas meter to the  
heater for leaks using soap and water solution  
after completing connection. DO NOT USE  
AN OPEN FLAME.  
Gas Inlet Connection (3/8" NPT)  
FIGURE 6. Rear View of 9740 Vent-Free Gas Heater  
GAS PRESSURE CHECK  
The heater regulator controls the burner pressure which should be checked at the pressure test point located on the  
right side of the main control and is accessible from the side of the gas log assembly (see FIGURE 7).  
The pressure should be checked with the heater burning and the control set to high (HI).  
The pressure regulator is preset and locked to avoid tampering. If the pressure is not as specified in Product  
Specifications (Page 5), contact your dealer and replace the regulator.  
Control Bracket  
(Rightside view  
facing heater)  
Test Pressure  
Input  
Test Pressure  
Output  
Control Valve  
FIGURE 7. Pressure Test Point Location  
9
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REMOVING FRONT SCREEN  
1) Lift the front screen slightly up (Fig. 2A) and then tilt the bottom of the screen inward and downward (Fig. 2B). 2)  
Lean the top of the screen toward you slightly (Fig. 2B) and then proceed to carefully bring the screen straight back  
(Fig. 2C). NOTE: To reinstall the front screen, reverse steps 1 & 2.  
FIG 2A  
FIG 2B  
FIG 2C  
LOG ASSEMBLY  
LOG POSITIONING  
This unit is supplied with a set of four ceramic fiber logs. Do not handle these logs with your bare hands! Always  
wearglovestopreventskinirritationfromceramicfibers. Afterhandlinglogs,washyourhandsgentlywithsoapand  
water to remove any traces of fibers.  
PROPER INSTALLATION SEQUENCE:  
1. Installtherearlog(#2)ontherearsetoflocators. Visuallychecktoverifythelogissecurelyplacedonthelocators.  
2. Install the front log (#1) on the front locators. Visually check to verify the log is securely placed on the locators.  
3. Install the left and right cross twigs as illustrated, on the locator pins provided in the front and rear logs. Holes  
provided in the bottom of the cross twigs should allow them to seat completely over these pins.  
WARNING: Failure to position the  
parts in accordance with these dia-  
grams or failure to use only parts spe-  
cificallyapprovedwiththisheatermay  
resultinpropertydamageorpersonal  
injury.  
#2  
#1  
FIGURE 8. Log Set Assembly  
The positioning of the logs is critical to the safe and clean operation of this heater.  
Sootingandotherproblemsmayresultifthelogsarenotproperlyandfirmlysituated  
in the appliance. Never add additional logs or embellishments such as pine cones,  
vermiculite or rock wool to the heater.  
FRONT SCREEN  
The front screen must be in place at all times when the appliance is operating. Do not obstruct the screened openings  
of the heater.  
10  
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OPERATING INSTRUCTIONS  
Avoid any drafts that alter the burner flame patterns. Do not allow fans to blow directly into the heater. Do not place  
a blower inside burn area of firebox. Ceiling fans may create drafts that alter burner flame patterns. Sooting and  
improper burning will occur.  
This vent-free gas heater is intended to be smokeless. If logs appear to smoke, turn off the heater and call a qualified  
service person. Initial burn off may cause slight smoke and odor during the first four hours of operation.  
FOR YOUR SAFETY READ BEFORE LIGHTING  
WARNING: If you do not follow these instructions exactly, a fire or explosion may  
result causing property damage, personal injury or loss of life.  
A.  
B.  
This appliance is equipped with an ignition device (piezo) which automatically lights the pilot. If piezo fails,  
thenlightthepilotusingmatches. Refertomatchlightinginstructions(page13). Whenlightingthepilot,follow  
theseinstructionsexactly.  
BEFORE LIGHTING smell all around the appliance area for gas. Be sure to smell next to the floor because  
some gas is heavier than air and will settle on the floor.  
WHAT TO DO IF YOU SMELL GAS  
• Do not attempt 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 fire department.  
C.  
D.  
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 qualified service technician. Force or attempted repair may result in a fire  
orexplosion.  
Do not use this appliance if any part has been under water. Immediately call a qualified service technician to  
inspect the appliance and to replace any part of the control system and any gas control which has been under  
water.  
FOR YOUR SAFETY  
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other  
appliance.  
11  
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OPERATING INSTRUCTIONS  
LIGHTING INSTRUCTIONS  
PILOT LOCATION  
1. STOP! Read the safety information on the  
previous page.  
2. Turn off all electrical power and open the  
access door.  
3. Turnofftherearburnerandsetthefrontburner  
to low.  
4. Push in gas control (knob 1) slightly and turn  
clockwise  
to "OFF".  
TOP VIEW OF BURNER ASSEMBLY  
KNOB 3  
3. REAR BURNER  
6. Push in the control (knob 1) all the way and  
rotate counter-clockwise  
to "PILOT".  
The piezo ignitor will light the pilot as the knob  
passes "IGN" traveling to the "PILOT". Con  
tinue to hold the control (knob 1) in for about  
ten (10) seconds after the pilot is lit. Release  
knob and it should pop back up. Pilot should  
remain lit. If it goes out, repeat steps 4 through  
6. If the control (knob 1) does not pop up when  
released, stop and immediately call your ser  
vice technician or gas supplier. If the pilot will  
not stay lit after several tries, turn the gas  
control (knob 1) to "OFF" and call your service  
technician or your gas supplier.  
1. PILOT  
2. FRONT BURNER  
KNOB 2  
KNOB 1  
NOTE: Knob cannot be turned from "PILOT" to  
"OFF" unless knob is pushed in slightly. Do not  
force.  
7. Turn gas control (knob1) counter-clockwise  
to "ON".  
8. Set the front burner (knob 2) to the desired  
setting rotating counter-clockwise  
MAX. and clockwise to MIN.  
9. Set the rear burner (knob 3) to the desired  
setting rotating counter-clockwise  
MAX./ ON or MIN.  
to  
5. Waitfive(5)minutestoclearoutanygas. Then  
smell for gas, including near the floor. If you  
smell gas, STOP! Follow "B" in the safety  
information on the previous page. If you don't  
smell gas, go on to the next step.  
to  
10. Closeaccessdoorandturnonelectricalpower.  
TURN OFF GAS TO APPLIANCE  
1. Open access door.  
2. Set front burner to Min. and turn off the rear burner by depressing knob and rotating clockwise  
until stop.  
3. Unplug all electric power (optional blower) if service is to be performed.  
4. Push in gas control knob slightly and turn clockwise  
5. Close access door.  
to "OFF". Do not force.  
12  
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OPERATING INSTRUCTIONS  
Wait 30 seconds before readjusting the heater when the control has been turned  
down to a lower setting.  
MATCH LIGHTING INSTRUCTIONS  
If the pilot will not light using the piezo ignitor, you can light the pilot with a match. First, locate the pilot. The pilot  
islocatedbetweenthetwoburnertubesontherightend(facingtheunit),insidethefirebox. Tolightpilotwithamatch,  
move the gas control (knob 1, pg. 12) to the pilot position and hold down. Light match and place near pilot. Once  
pilot is lit, continue to hold the knob for about ten seconds. Then follow steps 7 thru 10 on page 12.  
CHECKING FLAME APPEARANCE  
Flames from the pilot, front and rear burner should be visually checked when the heater is installed. In addition a  
periodic visual check of the flames should be made.  
PILOT FLAME  
The pilot flame should always be present when the  
heaterisinoperationandshouldjusttouchthetopofthe  
thermocouple tip (FIGURE 9).  
Ifthepilotflamedoesnottouchthethermocouple,then  
the main burner is unlikely to function reliably (FIG-  
URE 10).  
FIGURE 10. Incorrect Shape of Pilot Flame  
FIGURE 9. Pilot Flame  
CLEANING / SERVICING  
Annualinspectionandcleaningbyyourdealerorqualifiedservicetechnicianisrecommendedtopreventmalfunction  
and/orsooting.  
Turn off heater and allow to cool before cleaning.  
WARNING  
Remove front screen, (see page 6). Carefully lift screen from locating stubs and set aside during cleaning. Refer to  
instructions on page 6 for installation of screen. Do not operate the unit with the screen removed.  
Removelogs,handlingcarefullybyholdinggentlyateachend.Glovesarerecommendedtopreventskinirritationfrom  
ceramic. If the skin becomes irritated, wash gently with soap and water. Refer to manual for correct log placement.  
13  
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CLEANING / SERVICING  
Periodic Cleaning  
• Do not use cleaning fluid to clean logs or any part of heater.  
• Logs - Brush with soft bristle brush or vacuum with brush attachment.  
• Vacuum loose particles and dust from the front and rear burner, control, and piezo.  
• Inspect burner's and air intake hole. Remove lint or particles with vacuum.  
• External case should be dusted and wiped with a wet soapy cloth.  
Annual Cleaning/Inspection  
• Inspect and clean burner air intake holes.  
• Inspect and clean all burner ports.  
• Inspect ODS pilot for operation and accumulation of lint at air intake holes.  
• Verify flame pattern and log placement for proper operation.  
FLAME APPEARANCE  
• Verify smooth and responsive ignition of main burner and rear burner.  
In normal operation at full rate after 15 minutes the following flame appearance should be observed.  
FLAMES  
Theflamesbehindlog#1,andinfrontoflog#2,shouldbeyellowwithabluebase. Theflamesshouldnotbeimpinging  
#2  
#1  
on the small cross twigs. (See Below, Figure 11)  
FIGURE 11. Flames - Natural Gas and LP Gas  
14  
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HEATER ASSEMBLY REPLACEMENT PARTS  
1
2
3
4
5
13  
6
11  
7
10  
9
12  
8
15  
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PARTS LIST FOR HEATER ASSEMBLY  
KEY  
1
PART #  
69113  
69134  
69065  
69102  
69070  
24469  
69084  
24455  
24457  
89899  
83323  
24536  
89825  
89824  
83172  
DESCRIPTION  
QTY.  
1
CABINET TOP WELDMENT  
FIREBOX BACK WELDMENT  
FIREBOX TOP WELDMENT  
INSIDE BACK WELDMENT  
FIREBOX WELDMENT  
FIREBOX BOTTOM  
2
1
3
1
4
1
5
1
6
1
7
PEDESTAL WELDMENT  
PEDESTAL BASE  
1
8
1
9
CONTROL DOOR  
1
10  
11  
12  
13  
N/S  
N/S  
BRASS KNOB  
1
8-32 x 3/8 PH MACHINE SCREW  
FRONT SCREEN (PAINTED)  
BRASS TRIM  
1
1
2
MAGNETIC LATCH  
1
#10A x 1/2 HX W SM SCREWS  
58  
N/S = NOT SHOWN  
IMPORTANT NOTICE: WHEN ORDERING CABINET PARTS, PLACE THE APPROPRIATE  
CODE AFTER THE PART NUMBER THAT CORRESPONDS TO THE COLOR OF YOUR UNIT.  
ALMOND = A  
CHARCOAL GRAY = C  
GREEN = G  
16  
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BURNER & LOG ASSEMBLY  
17  
11  
1
13  
14  
12  
20  
7
9
8
16  
10  
4
19  
15  
6
18  
3
D
C
B
2
A
5
17  
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PARTS LIST FOR GAS LOG ASSEMBLY  
KEY  
PART #  
24610  
24611  
81189  
81190  
83251  
83244  
83343  
89831  
89834  
89838  
89839  
89840  
24612  
89872  
89873  
83437  
89841  
89842  
89829  
89836  
89830  
89836  
24613  
89826  
89826-1  
89826-2  
89826-3  
89826-4  
89856  
86318  
89855  
DESCRIPTION  
QTY.  
1
1
2
3
BURNER PLATE  
CONTROL BRACKET  
1
CONTROL VALVE (NATURAL)  
CONTROL VALVE (L.P.)  
10-24 x 1 SL ROD  
1
1
4
5
2
10-24 KEP NUT  
2
N/S  
6
#10 X 1/2 HX HD SCREW  
BURNER/CONTROL FITTING  
1/4" TUBE, BURNER/REGULATOR  
1/4 CC X 3/8-27 FITTING  
1/4 COMPRESSION NUT  
1/4 COMPRESSION SLEEVE  
PILOT BRACKET  
8
1
7
1
8
1
9
1
10  
11  
12  
1
1
"O.P. AMERICA" NAT. PILOT  
"O.P. AMERICA" L.P. PILOT  
#8-1/2 HX HD SCREW (TO MOUNT PILOT)  
3/16 COMPRESSION NUT  
3/16 COMPRESSION SLEEVE  
#47 NATURAL BURNER ORIFICE(FRONT)  
#55 L.P. BURNER ORIFICE (FRONT)  
#48 NATURAL BURNER ORIFICE(REAR)  
#55 L.P. BURNER ORIFICE (REAR)  
BURNER (PAINTED)  
1
1
N/S  
13  
2
1
14  
1
15  
1
1
16  
1
1
17  
18  
a
2
LOG SET (CONSISTS OF 4 PIECES)  
FRONT LOG  
1
-
b
REAR LOG  
-
c
RIGHT TWIG  
-
d
LEFT TWIG  
-
19  
N/S  
20  
3/16" LOXIT FITTING  
1
16GA WIRE LINK  
1FT.  
1
PILOT TUBE  
N/S = NOT SHOWN  
18  
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TROUBLESHOOTING  
Turn off and let cool before servicing. Only a qualified service person should service  
and repair heater.  
NOTE: All troubleshooting items are listed in order of operation.  
POSSIBLE CAUSE  
REMEDY  
OBSERVED PROBLEM  
Ignitor electrode positioned wrong  
Replace ignitor.  
Ignitor electrode is broken  
Replace ignitor.  
Ignitor electrode not connected to ignitor Reconnect ignitor cable.  
cable.  
When ignitor button is pressed, there is no  
spark at ODS/Pilot.  
Ignitor cable pinched or wet keep ignitor Free ignitor cable if pinched by any metal  
cable dry.  
or tubing.  
Broken ignitor cable  
Bad piezo ignitor  
Replace ignitor cable.  
Replace piezo ignitor.  
Appliance burning vapors from paint, hair Ventilate room. Stop using odor-causing  
spray, glues, etc.  
products while heater is running.  
Appliance produces unwanted odors.  
Appliance shuts off in use.  
Gas leak.  
Locate and correct all leaks.  
Not enough fresh air is available for ODS/  
Pilot to operate.  
Open window and/or door ventilation  
Low line pressure.  
Contact local gas company.  
ODS/Pilot is partially clogged.  
Gas leak.  
Clean ODS/Pilot.  
Gas odor even when control knob is in  
OFF position.  
Locate and correct all leaks.  
Control valve defective. Gas supply turned Replace control valve.  
off or manual shutoff valve closed.  
Turnongassupplyoropenmanualshutoff  
valve.  
Control knob not in PILOT position.  
Turn control knob while in PILOT position.  
When ignitor button is pressed, there is  
spark at ODS/Pilot, but no ignition.  
Control knob not pressed in while in Pilot Press in control knob while in PILOT posi-  
position  
tion.  
Air in gas lines when installed.  
Continue holding down control knob. Re-  
peat igniting operation until air is removed  
ODS/Pilot is clogged.  
Replace ODS/pilot assembly or get is  
serviced  
Replace gas regulator.  
Press in control knob fully.  
Gas regulator setting is not correct.  
Control knob not fully pressed in.  
ODS/Pilot lights, but flame goes out when  
control knob is released.  
After ODS/pilot lights, keep control knob  
pressed in 30 seconds.  
Control knob not pressed in long enough.  
Fully open manual shutoff valve.  
Manual shutoff valve not fully open.  
19  
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TROUBLESHOOTING, CONTINUED...  
OBSERVED PROBLEM  
POSSIBLE CAUSE  
REMEDY  
Thermocouple connection loose at  
control valve.  
Hand tighten until snug, then  
tighten 1/4 turn more.  
Contact local gas company.  
ODS/Pilot lights, but flame goes out  
When control knob is released.  
(continued from page 17)  
Pilot flame not touching thermocouple,  
which allows thermocouple to cool,  
causing pilot flame to go out. This  
problem could be caused by either  
low gas pressure, or a dirty or partially  
clogged ODS/pilot.  
Thermocouple damaged.  
Control valve damaged.  
Replace thermocouple.  
Replace control valve.  
Burner orifice is clogged.  
Clean burner or replace burner  
orifice.  
One or both burner do not  
light after ODS/pilot is lit.  
Burner orifice diameter is too small.  
Inlet gas pressure is too low.  
Replace burner orifice.  
Contact qualified service person.  
Manifold pressure is too low.  
Burner orifice is clogged.  
Contact local gas company.  
Clean burner or replace burner  
orifice.  
Burner backfires during  
combustion.  
Burner orifice is clogged or damaged.  
Clean burner or replace burner  
orifice.  
Slight smoke or odor during  
initial operation.  
Burner is damaged.  
Replace burner.  
Gas regulator defective.  
Replace gas regulator.  
Vapors from paint or curing process  
of logs.  
Problem will stop after a few hours  
of operation. Run the heater with  
the damper open if you have one,  
or open a window for the first few  
hours.  
Logs appear to smoke after  
initial operation.  
Log heater is intended to be  
smokeless. Turn OFF heater and  
call qualified service person.  
Turning control knob to HIGH (3)  
position when burner is cold.  
Turn control knob to LOW (2)  
position and let warm up for a  
minute.  
Heater produces a whistling  
noise when burner is lit.  
Air in gas line.  
Operate burner until air is removed  
from line. Have gas line checked  
by local gas company.  
Clean burner or replace burner  
orifice.  
Dirty or partially clogged burner  
orifice.  
LP-regulator shut down due to inlet  
pressure too high.  
Verify LP tank regulator is  
installed and set to 11" to 13"w.c.  
Replace regulator on heater.  
No gas to pilot.  
If the gas quality is bad, your pilot may not stay lit, the burners may produce soot  
and the heater may backfire when lit. If the gas quality or pressure is low, contact  
your local gas supplier immediately.  
20  
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OPTIONAL F40 BLOWER KIT  
THIS OPTIONAL F40 BLOWER KIT IS AVAILABLE WHERE YOU PURCHASED THIS  
HEATER OR YOU CAN ORDER DIRECT FROM THE FACTORY BY CONTACTING  
THE PARTS DEPARTMENT AT THE NUMBER AND ADDRESS ON THE BACK  
PAGE OF THIS MANUAL.  
BACK VIEW OF 9740  
21  
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NOTES  
22  
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LIMITED WARRANTY POLICY  
This vent-free gas heater is warrantied for a period of one year, logs for one  
year, and burners for One Year, from date of purchase against defects in  
materialorworkmanship. Thiswarrantycoversonlythecostofdefectiveparts  
and applies only to the original consumer purchaser. The replacement of  
defective parts will be without charge. This warranty does not extend to (1)  
heater damage by accident, neglect, misuse, abuse, alteration, negligence of  
others, including the installation thereof by unqualified installers, (2) the costs  
of removal, reinstallation or transportation of defective parts on the heater, or  
(3) incidental or consequential damage.  
THIS WARRANTY IS EXPRESSLY IN LIEU OF OTHER WARRAN-  
TIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTY OF  
MERCHANTABILITY OF FITNESS FOR PURPOSE AND OF ALL  
OTHEROBLIGATIONSORLIABILITIES, UNITEDSTATESSTOVE  
COMPANY DOES NOT ASSUME FOR IT, ANY OTHER OBLIGA-  
TION OR LIABILITY IN CONNECTION WITH THE SALE OR USE  
OF THIS HEATER.  
The heater (MUST BE INSTALLED BY A QUALIFIED INSTALLER) in  
accordance with the instructions furnished with the unit. The defective heater  
should be returned at your expense to the dealer from whom the product was  
purchased or an authorized service agent. Any products presented for  
warranty repair must be accompanied by a dated proof of purchase. Since  
some states do not allow the exclusion on limitation of incidental or conse-  
quential damages, or on how long an implied warranty lasts, the above  
limitations may not apply to you.  
23  
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OWNERS MANUAL  
HOW TO ORDER REPAIR PARTS OR "OPTIONS"  
THIS MANUAL WILL HELP YOU TO OBTAIN EFFICIENT, DEPENDABLE  
SERVICE FROM THE FURNACE, AND ENABLE YOU TO ORDER RE-  
PAIR PARTS CORRECTLY.  
KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.  
WHEN WRITING, ALWAYS GIVE THE FULL MODEL NUMBER WHICH IS  
ONTHENAMEPLATEATTACHEDINSIDETHEFRONTOFTHEHEATER.  
WHEN ORDERING REPAIR PARTS OR OPTIONS, ALWAYS GIVE THE  
FOLLOWING INFORMATION AS SHOWN IN THIS LIST:  
1. The PART NUMBER  
2. The PART DESCRIPTION  
3. The MODEL NUMBER: 9740N / 9740L  
4. The SERIAL NUMBER  
BEFORE INSTALLING YOUR HEATER, FILL IN THE SE-  
RIAL NUMBER IN THE SPACE PROVIDED ABOVE FOR  
YOUR RECORDS.  
UNITED STATES STOVE COMPANY  
227 Industrial Park Rd., P.O. Box 151  
S
C
U S  
South Pittsburg, TN 37380  
(423) 837-2100  
P
24  
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