Vanguard Heating Water Heater VN12 User Manual

®
VENT-FREE NATURAL GAS HEATER  
OWNER’S OPERATION AND INSTALLATION MANUAL  
Models: VN6A and VN12  
WARNING: If the information in this manual  
is not followed exactly, a fire or explosion  
may result causing property damage, per-  
sonal injury, or loss of life.  
WARNING:Improperinstallation,  
adjustment, alteration, service, or  
maintenance can cause injury or  
property damage. Refer to this  
manual for correct installation and  
operational procedures. For assis-  
tance or additional information  
consult a qualified installer, ser-  
vice agency, or the gas supplier.  
— Do not store or use gasoline or other  
flammable vapors 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.  
• Immediatelycallyourgassupplierfrom  
a neighbor’s phone. Follow the gas  
supplier’s instructions.  
• If you cannot reach your gas supplier,  
call the fire department.  
GAS  
®
— Installation and service must be per-  
formed by a qualified installer, service  
agency, or the gas supplier.  
T
Save this manual for future reference.  
 
SAFETY  
!
WARNING ICON  
G
001  
WARNINGS Continued  
INFORMATION  
1. Use only natural gas. Do not convert heater to use different fuel type.  
Continued  
2. If you smell gas  
• shut off 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. Follow the  
gas supplier’s instructions  
• if you cannot reach your gas supplier, call the fire department  
3. Never install the heater  
• in sleeping quarters or a recreational vehicle  
• where curtains, furniture, clothing, or other flammable objects are less than  
36 inches from the front, top, or sides of the heater  
• as a fireplace insert  
• in high traffic areas  
• in windy or drafty areas  
4. Always run heater with control knob at LOW or HIGH locked positions  
(VN12) or ON position (VN6A). Never set control knob between locked  
positions. Poor combustion and higher levels of carbon monoxide may result.  
5. Open window to admit fresh, outside air when using heater. Open window one  
or two inches. When used without fresh, outside air, heater may give off  
carbon monoxide gas.  
6. Never run heater in small, closed room. Open door into next room to help  
ventilate.  
7. Keep all air openings in front and bottom of heater clear and free of debris.  
This will insure enough air for proper combustion.  
8. If heater shuts off, do not relight until you provide fresh, outside air. If heater  
keeps shutting off, have it serviced.  
9. Do not run heater  
• where flammable liquids or vapors are used or stored  
• under dusty conditions  
10. Never place any objects on the heater.  
11. Surface of heater becomes very hot when running heater. Keep children and  
adults away from hot surface to avoid burns or clothing ignition. Heater will  
remain hot for a time after shut-down. Allow surface to cool before touching.  
12. Make sure grill guard is in place before running heater.  
13. Do not alter heater or its controls. Any change may create a safety hazard.  
14. Do not use heater if any part of heater has been under water.  
15. Turn off heater and let cool before servicing. Only a qualified service person  
should service and repair heater.  
16. Do not operate heater above elevations of 4,500 feet.  
3
 
Control Knob  
PRODUCT  
IDENTIFICATION  
Grill  
Guard  
Burners  
Heater  
Cabinet  
Front  
Panel  
Figure 1 - Vent-Free Natural Gas Heater (Model VN12 Shown)  
Install and use heater with care. Follow all local codes. In the absence of local  
codes, use the latest edition of National Gas Code ANSI Z223.1, also known as  
NFPA 54*.  
LOCAL CODES  
*Available from:  
American National Standards Institute, Inc.  
1430 Broadway  
New York, NY 10018  
National Fire Protection Association, Inc.  
Batterymarch Park  
Quincy, MA 02269  
1. Remove heater from carton.  
UNPACKING  
2. Remove all protective packaging applied to heater for shipment.  
3. Check heater for any shipping damage. If heater is damaged, promptly inform  
dealer where you bought heater.  
Safety Device  
PRODUCT  
FEATURES  
This heater has a pilot with an Oxygen Depletion Sensor Shutoff System (ODS).  
The ODS/pilot is a required feature for vent-free room heaters. The ODS/pilot shuts  
off the heater if there is not enough fresh air.  
Piezo Ignition System  
This heater has a piezo ignitor. This system requires no matches, batteries, or other  
sources to light heater.  
4
 
INSTALLING  
TO WALL  
NOTICE  
A qualified service person must install heater. Follow all local codes.  
CHECK GAS TYPE  
Use only natural gas. If your gas supply is not natural, do not install heater. Call  
dealer where you bought heater for proper type heater.  
INSTALLATION ITEMS  
Before installing heater, make sure you have the items listed below.  
• piping (check local codes)  
• sealant (resistant to propane gas)  
• manual shutoff valve *  
• ground joint union  
• test gauge connection * (see  
Figure 10, page 10)  
• sediment trap  
• tee joint  
• pipe wrench  
* An A.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an acceptable  
alternative to test gauge connection. Purchase the optional A.G.A. design-certified  
manual shutoff valve from your dealer. See ACCESSORY, page 21.  
LOCATING HEATER  
This heater is designed to be mounted on a wall.  
!
WARNING  
WARNING ICON  
G
001  
Maintain the minimum clearances shown in Figure 2 (page 6). If you  
can, provide greater clearances from floor, ceiling, and joining wall.  
!
WARNING  
WARNING ICON  
G
001  
Never install the heater  
• in sleeping quarters, a mobile home, or a recreational vehicle  
• where curtains, furniture, clothing, or other flammable objects  
are less than 36 inches from the front, top, or sides of the heater  
• as a fireplace insert  
• in high traffic areas  
• in windy or drafty areas  
!
CAUTION  
WARNING ICON  
G
001  
Operating heater where impurities in the air (such as tobacco  
smoke) exist, may discolor walls.  
!
CAUTION  
WARNING ICON  
G
001  
If you install the heater in a home garage  
• heater pilot and burner must be at least 18 inches above floor  
• locate heater where moving vehicle will not hit it  
For convenience and efficiency, install heater  
• where there is easy access for operation, inspection, and service  
• in coldest part of room  
Continued  
5
 
CEILING  
36"  
Minimum  
8"  
Minimum  
From  
Sides Of  
Heater  
Right  
Side  
Left  
Side  
3"  
Minimum To Top Surface  
Of Carpeting, Tile Or Other  
Combustible Material  
FLOOR  
Figure 2 - Mounting Clearances As Viewed From Front of Heater  
INSTALLING HEATER TO WALL  
Marking Screw Locations  
1. Determine where you will locate heater.  
!
WARNING  
WARNING ICON  
G
001  
Maintain minimum clearances shown in Figure 3. If you can,  
provide greater clearances from floor and joining wall.  
2. Mark two mounting screw locations on wall (see Figure 3).  
10 7/8"  
7 3/4"  
Minimum To  
Maintain 8"  
Clearance  
From Wall  
Mounting  
Screw  
Locations  
20 1/4"  
Minimum To  
Maintain 3"  
Clearance  
From Floor  
FLOOR  
Figure 3 - Mounting Screw Locations  
6
 
Installing Two Mounting Screws  
Note: Wall anchors and mounting screws are in hardware package. The hardware  
package is provided with heater.  
Attaching to wall stud method  
For attaching mounting screw to wall stud  
1. Drill hole at marked location using 9/64" drill bit.  
2. Insert mounting screw into wall stud.  
3. Tighten screw until 1/16" space (thickness of penny) is between screwhead and  
wall.  
Attaching to wall anchor method  
Follow instructions below to attach mounting screws to hollow walls (wall areas  
between studs) or solid walls (concrete or masonry).  
1. Drill holes at marked locations using 5/16" drill bit. For solid walls (concrete or  
masonry), drill at least 1 1/4" deep.  
2. Fold wall anchor (see Figure 4).  
Figure 4 - Folding Anchor  
3. Insert wall anchor (wings first) into hole. Tap anchor flush to wall.  
4. For thin walls (1/2" or less), insert red key into wall anchor. Push red key to  
“pop” open anchor wings (see Figure 5). IMPORTANT: Do not hammer key!  
For thick walls (over 1/2" thick) or solid walls, do not pop open wings.  
Thin Walls  
(1/4" to 1/2" thick)  
Figure 5 - Popping Open Anchor Wings For Thin Walls  
5. Tighten two screws until 1/16" space (thickness of penny) is between screwheads  
and wall (see Figure 6).  
Thin or Thick Wall  
(thick wall shown)  
1/16" Space  
Solid Wall  
ANCHOR  
Figure 6 - Tightening Anchors  
7
 
Placing Heater On Mounting Screws  
1. Locate two keyhole slots on back panel of heater (see Figure 7).  
2. Place large openings of slots over screwheads. Slide heater down until screws  
are in small portion of slots.  
Keyhole Slots  
Figure 7 - Location Of Keyhole Slots On Back Panel Of Heater  
Removing Front Panel Of Heater  
1. Remove two screws near bottom corners of front panel.  
2. Lift straight up on grill guard until it stops. Grill guard will slide up about 1/4".  
3. Pull bottom of front panel forward, then down.  
Figure 8 - Removing Front Panel Of Heater  
Installing Bottom Mounting Screw  
1. Locate bottom mounting hole. This hole is near bottom on back panel of heater  
(see Figure 9).  
2. Mark screw location on wall.  
3. Remove heater from wall.  
4. If installing bottom mounting screw into hollow or solid wall, install wall anchor.  
Follow steps 1 through 5 under Attaching To Wall Anchor Method, page 7.  
If installing bottom mounting screw into wall stud, drill hole at marked location  
using 9/64" drill bit.  
5. Replace heater on wall.  
6. Insert bottom anchor screw through back panel into bottom anchor or drilled  
hole (see Figure 9).  
7. Tighten screw until heater is firmly secured to wall. Do not over tighten.  
Note: Do not replace front panel at this time. Replace front panel after making  
gas connections and checking for leaks (see pages 9-11).  
Figure 9 - Installing Bottom Mounting Screw  
8
 
CONNECTING  
TO GAS  
NOTICE  
A qualified service person must connect heater to gas supply.  
Follow all local codes.  
SUPPLY  
!
WARNING  
WARNING ICON  
G
001  
Never connect heater to private (non-utility) gas wells. This gas is  
commonly known as well-head gas.  
IMPORTANT: Check gas line pressure before connecting heater to gas line. Gas  
line pressure must be no greater than 14 inches of water. If gas line pressure is  
higher, heater regulator damage could occur.  
!
CAUTION  
WARNING ICON  
G
001  
Use only new, black iron or steel pipe. Copper tubing may be used  
in certain areas. Check your local codes. Use pipe 3/8" diameter or  
greater to allow proper gas volume to heater. If pipe is too small,  
undue loss of pressure will occur.  
Installation must include a manual shutoff valve, ground joint union, and plugged  
1/8" NPT tap. Locate NPT tap within reach for test gauge hook up. NPT tap must  
be upstream from heater (see Figure 10, page 10).  
Apply pipe joint sealant lightly to male threads. This will prevent excess sealant  
from going into pipe. Excess sealant in pipe could result in clogged heater valves.  
!
CAUTION  
WARNING ICON  
G
001  
Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.  
Install sediment trap in supply line as shown in Figure 10. 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 heater controls. If sediment trap is not installed or is installed  
wrong, heater may not run properly.  
Continued  
9
 
IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping  
and/or fittings.  
Pressure  
Regulator  
3/8" NPT  
Pipe Nipple  
Heater  
Cabinet  
Ground Joint  
Union  
Manual  
Shutoff  
Valve *  
Tee Joint  
Reducer  
Test  
Gauge  
Connection *  
Bushing to  
1/8" NPT  
From  
Gas Meter  
(4" W.C. to  
10.5" W.C.  
Pressure)  
1/8" NPT  
Plug Tap  
Tee  
Joint  
Sediment  
Trap  
3" Minimum  
Pipe  
Nipple  
Cap  
Figure 10 - Gas Connection  
* An A.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an acceptable  
alternative to test gauge connection. Purchase the optional A.G.A. design-certified  
manual shutoff valve from your dealer. See ACCESSORY, page 21.  
CHECKING  
GAS  
CONNECTIONS  
!
WARNING  
WARNING ICON  
G
001  
Test all gas piping and connections for leaks after installing or  
servicing. Correct all leaks at once.  
!
WARNING  
WARNING ICON  
G
001  
Never use an open flame to check for a leak. Apply a mixture of  
liquid soap and water to all joints. Bubbles forming show a leak.  
Correct all leaks at once.  
PRESSURE TESTING GAS SUPPLY PIPING SYSTEM  
Test Pressures In Excess Of 1/2 PSIG  
1. Disconnect heater and its individual manual shutoff valve from gas supply  
piping system. Pressures in excess of 1/2 PSIG will damage heater regulator.  
2. Cap off open end of gas pipe where manual shutoff valve was connected.  
3. Pressurize supply piping system by either using compressed air or  
opening main gas valve located on or near gas meter.  
Continued  
10  
 
4. Check all joints of gas supply piping system. Apply mixture of liquid soap and  
water to gas joints. Bubbles forming show a leak.  
5. Correct all leaks at once.  
Test Pressures Equal To or Less Than 1/2 PSIG  
1. Close manual shutoff valve (see Figure 11).  
2. Pressurize supply piping system by either using compressed air or opening main  
gas valve located on or near gas meter.  
3. Check all joints from gas meter to manual shutoff valve (see Figure 12). Apply  
mixture of liquid soap and water to gas joints. Bubbles forming show a leak.  
4. Correct all leaks at once.  
PRESSURE TESTING HEATER GAS CONNECTIONS  
1. Open manual shutoff valve (see Figure 11).  
2. Open main gas valve located on or near gas meter.  
3. Make sure control knob of heater is in the OFF position.  
4. Check all joints from manual shutoff valve to control valve (see Figure 12).  
Apply mixture of liquid soap and water to gas joints. Bubbles forming show a  
leak.  
5. Correct all leaks at once.  
6. Light heater (see OPERATING HEATER, pages 12 through 15). Check the rest  
of the internal joints for leaks.  
7. Turn off heater (see TO TURN OFF GAS TO APPLIANCE, page 15).  
8. Replace front panel.  
Open  
P
Manual  
Shutoff  
Valve  
Closed
Figure 11 - Manual Shutoff Valve  
Control Valve Location  
Gas Meter  
Manual  
Shutoff  
Valve  
Figure 12 - Checking Gas Joints  
11  
 
FOR YOUR SAFETY READ BEFORE LIGHTING  
OPERATING  
HEATER  
!
WARNING  
WARNING ICON  
G
001  
If you do not follow these instructions exactly, a fire or  
explosion may result causing 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 floor because some gas is heavier than air and will settle on  
the floor.  
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 fire 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 qualified  
service technician or gas supplier. Force or attempted repair may result in a fire  
or explosion.  
D. 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.  
LIGHTING INSTRUCTIONS  
1. STOP! Read the safety information above.  
2. Make sure manual shutoff valve is fully open.  
Clockwise  
3. Turn control knob clockwise  
to the OFF position.  
Control Knob  
OFF  
PILOT  
IGN  
LOW  
HIGH  
Figure 13 - Control Knob In The OFF Position (Model VN12 Shown)  
12  
 
4. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the  
floor. If you smell gas, STOP! Follow “B” in the safety information at the top of  
page 12. If you don’t smell gas, go to the next step.  
5. Press in control knob.  
Note: You may be running this heater for the first time after hooking up to gas  
supply. If so, the control knob may need to be pressed in for 30 seconds. This  
will allow air to bleed from the gas system.  
• If control knob does not pop up when released, contact a qualified service  
person or gas supplier for repairs.  
C-clockwise  
6. Keep control knob pressed in and turn it counterclockwise  
PILOT/IGN position. This will light pilot.  
to the  
Note: You will hear a loud “click” when the control knob reaches the  
PILOT/IGN position.  
If pilot does not light  
Clockwise  
• turn control knob clockwise  
• repeat steps 5 and 6  
to the OFF position  
If pilot does not stay lit after several tries  
• refer to TROUBLESHOOTING, pages 17 through 20  
• contact a qualified service person or gas supplier  
Until repairs are made, light pilot with match. To light pilot with match, see  
Ignitor Electrode  
Pilot Burner  
Thermocouple  
Figure 14 - Pilot  
MANUAL LIGHTING PROCEDURE, page 15.  
7. Keep control knob pressed in for 10 seconds after lighting pilot. After 10 sec-  
onds, release control knob.  
Note: If pilot goes out, repeat steps 3 through 7.  
13  
 
TO SELECT HEATING LEVEL  
!
WARNING  
WARNING ICON  
G
001  
When running heater, set control knob at LOW or HIGH locked  
positions (VN12) or ON position (VN6A). Never set control knob  
between locked positions. Poor combustion and higher levels  
of carbon monoxide may result.  
!
CAUTION  
WARNING ICON  
G
001  
Do not try to adjust heating levels by using the manual shutoff  
valve.  
C-clockwise  
1. Slightly press in control knob and turn counterclockwise  
HIGH positions (VN12) or ON position (VN6A).  
to the LOW or  
IMPORTANT: Release downward pressure while turning control knob. Control  
knob will lock at the desired position.  
Control  
Knob  
VN6A  
Burner  
Control  
Knob  
VN12  
Burners  
OFF  
OFF  
PILOT  
IGN  
PILOT  
IGN  
ON  
LOW  
OFF  
OFF  
PILOT  
IGN  
HIGH  
OFF  
Figure 15 - Burner Patterns  
14  
 
TO TURN OFF GAS TO APPLIANCE  
Shutting Off Heater  
1. Turn control knob clockwise  
Clockwise  
to the OFF position.  
Shutting Off Burner Only (pilot stays lit)  
Clockwise  
1. Turn control knob clockwise  
to the PILOT position.  
MANUAL LIGHTING PROCEDURE  
1. Remove front panel (see Figure 8, page 8).  
2. Follow steps 1 through 6 under LIGHTING INSTRUCTIONS, pages 12 and 13.  
3. With control knob pressed in, strike match. Hold match to pilot until pilot lights.  
4. Keep control knob pressed in for 10 seconds after pilot is lit. After 10 seconds,  
release control knob.  
5. Replace front panel.  
Check pilot flame pattern and burner flame pattern often.  
INSPECTING  
BURNER  
PILOT FLAME PATTERN  
Figure 16 shows a correct pilot flame pattern. Figure 17 shows an incorrect pilot  
flame pattern. The incorrect pilot flame is not touching the thermocouple. This will  
cause the thermocouple to cool. When the thermocouple cools, the heater will shut  
down.  
Pilot Burner  
Thermocouple  
GOOD PILOT  
Figure 16 - Correct Pilot Flame PGaRtHt/OeVr0n09  
Pilot Burner  
Thermocouple  
GRH/OV 010  
FiguBrAeD P1IL7OT- Incorrect Pilot Flame Pattern  
If pilot flame pattern is incorrect, as shown in Figure 17  
• turn heater off (see TO TURN OFF GAS TO APPLIANCE, above)  
• see TROUBLESHOOTING, pages 17 through 20  
Continued  
15  
 
BURNER FLAME PATTERN  
Figure 18 shows a correct burner flame pattern. Figure 19 shows an incorrect  
burner flame pattern.  
Figure 18 - Correct Burner Flame Pattern (Model VN12 Shown)  
Figure 19 - Incorrect Burner Flame Pattern (Model VN12 Shown)  
If burner flame pattern is incorrect, as shown in Figure 19  
• turn heater off (see TO TURN OFF GAS TO APPLIANCE, page 15)  
• see TROUBLESHOOTING, pages 17 through 20  
CLEANING  
AND  
!
WARNING  
WARNING ICON  
G
001  
Turn off heater and let cool before cleaning.  
MAINTENANCE  
!
CAUTION  
WARNING ICON  
G
001  
You must keep control areas, burner, and circulating air passageways  
of heater clean. Inspect these areas of heater before each use. Have  
heater inspected yearly by a qualified service person. Heater may  
need more frequent cleaning due to excessive lint from carpeting,  
bedding material, etc.  
ODS/PILOT AND BURNER ORIFICE  
• Use a vacuum cleaner, pressurized air, or small, soft bristled brush to clean.  
CABINET  
Air Passageways  
• Use a vacuum cleaner or pressurized air to clean.  
Exterior  
• Use a soft cloth dampened with a mild soap and water mixture. Wipe the  
cabinet to remove dust.  
16  
 
TROUBLE-  
SHOOTING  
!
WARNING  
WARNING ICON  
G
001  
Turn off heater 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.  
!
CAUTION  
WARNING ICON  
G
001  
Never use a wire, needle, or similar object to clean ODS/pilot. This  
can damage ODS/pilot unit.  
OBSERVED  
PROBLEM  
POSSIBLE  
CAUSE  
REMEDY  
When control knob is 1. Ignitor electrode posi- 1. Replace ignitor  
pressed in and turned tioned wrong  
to the PILOT/IGN po- 2. Ignitor electrode broken  
sition, there is no 3. Ignitor electrode not con- 3. Reconnect ignitor cable  
2. Replace ignitor  
spark at ODS/pilot  
nected to ignitor cable  
4. Ignitor cable pinched or 4. Free ignitor cable if  
wet  
pinched by any metal or  
tubing.Keepignitorcable  
dry  
5. Broken ignitor cable  
6. Bad piezo ignitor  
5. Replace ignitor cable  
6. Replacecontrolvalve(pi-  
ezo is part of control  
valve)  
When control knob is 1. Gas supply turned off or 1. Turn on gas supply or  
pressed in and turned  
to the PILOT/IGN po-  
manual shutoff valve  
closed  
open manual shutoff  
valve  
sition, there is spark at 2. Control knob not pressed 2. Press in control knob  
ODS/pilotbutnoigni-  
tion  
in while being turned to  
PILOT/IGN position  
while turning to PILOT/  
IGN position  
3. Air in gas lines when in- 3. Continue holding down  
stalled  
control knob. Repeat ig-  
niting operation until air  
is removed  
4. ODS/pilot is clogged  
4. Clean ODS/pilot (see  
C L E A N I N G A N D  
MAINTENANCE, page  
16) or replace ODS/pilot  
assembly  
5. Gas regulator setting is 5. Replace gas regulator  
not correct  
17  
 
POSSIBLE  
CAUSE  
OBSERVED  
PROBLEM  
REMEDY  
ODS/pilot lights but  
flame goes out when  
control knob is  
released  
1. Control knob not fully  
pressed in  
2. Control knob not  
pressed in long enough  
1. Press in control knob  
fully  
2. After ODS/pilot lights,  
keep control knob  
pressed in 10 seconds  
3. Fully open manual shut-  
off valve  
3. Manual shutoff valve  
not fully open  
4. Thermocouple connec-  
tion loose at control  
valve  
4. Hand tighten until snug,  
then tighten 1/4 turn  
more  
5. Pilot flame not touching  
thermocouple, which  
allows thermocouple to  
cool, causing pilot  
flame to go out. This  
problem could be  
caused by one or both of  
the following:  
5. A) Contact local natural  
gas company  
B)CleanODS/pilot(see  
CLEANING  
AND  
M A I N T E N A N C E ,  
page 16) or replace  
ODS/pilot assembly  
A) Low gas pressure  
B) Dirty or partially  
clogged ODS/pilot  
6. Thermocouple dam-  
aged  
7. Control valve damaged  
6. Replace thermocouple  
7. Replace control valve  
Burner(s) does not 1. Burner orifice(s) is 1. Clean burner orifice(s)  
lightafterODS/pilotis  
lit  
clogged  
(see CLEANING AND  
MAINTENANCE, page  
16) or replace burner  
orifice(s)  
2. Burner orifice(s) di- 2. Replace burner orifice(s)  
ameter is too small  
3. Inlet gas pressure is too 3. Contact local natural gas  
low  
company  
Delayed ignition of 1. Manifoldpressureistoo 1. Contact local natural gas  
burner(s)  
low  
company  
2. Burner orifice(s) is 2. Clean burner orifice(s)  
clogged  
(see CLEANING AND  
MAINTENANCE, page  
16) or replace burner  
orifice(s)  
Burner backfiring  
during combustion  
1. Burner orifice(s) is 1. Clean burner orifice(s)  
clogged or damaged  
(see CLEANING AND  
MAINTENANCE, page  
16) or replace burner  
orifice(s)  
2. Burner damaged  
2. Replace burner  
3. Gas regulator defective  
3. Replace gas regulator  
18  
 
POSSIBLE  
CAUSE  
OBSERVED  
PROBLEM  
REMEDY  
1. Plaque damaged  
2. Inlet gas pressure is too  
low  
Burner plaque(s) does  
not glow  
1. Replace burner  
2. Contact local natural gas  
company  
3. Control knob set be-  
tween locked positions  
3. Turncontrolknobuntilit  
locks at desired setting  
1. Residues from manu-  
facturing processes  
Slight smoke or odor  
during initial opera-  
tion  
1. Problem will stop after a  
few hours of operation  
1. Metal expanding while  
heating or contracting  
while cooling  
Heater produces a  
clicking/ticking noise  
justafterburnerislitor  
shut off  
1. This is common with  
most heaters. If noise is  
excessive, contact quali-  
fied service person  
!
WARNING  
WARNING ICON  
G
001  
If you smell gas  
• Shut off 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. Follow the gas supplier’s  
instructions.  
• If you cannot reach your gas supplier, call the  
fire department.  
1. Heater burning vapors  
from paint, hair spray,  
glues, etc.  
Heater produces un-  
wanted odors  
1. Ventilate room. Stop us-  
ing odor-causing prod-  
ucts while heater is run-  
ning  
2. Gas leak. See Warn-  
ing statement  
above  
2. Locate and correct all  
leaks (see CHECKING  
GAS CONNECTIONS,  
page 10)  
1. Not enough fresh air is  
available  
Heater shuts off in use  
(ODS operates)  
1. Open window and/or  
door for ventilation  
2. Low line pressure  
2. Contact local natural gas  
company  
3. ODS/pilot is partially  
clogged  
3. Clean ODS/pilot (see  
CLEANING  
AND  
MAINTENANCE, page  
16)  
19  
 
!
WARNING  
WARNING ICON  
G
001  
If you smell gas  
• Shut off 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. Follow the gas supplier’s  
instructions.  
• If you cannot reach your gas supplier, call the  
fire department.  
POSSIBLE  
CAUSE  
OBSERVED  
PROBLEM  
REMEDY  
1. Gas leak. See Warn-  
ing statement at  
top of page  
1. Locate and correct all  
leaks (see CHECK-  
Gas odor even when  
control knob is in OFF  
position  
ING GAS CONNEC-  
TIONS, page 10)  
2. Control valve defective  
2. Replace control valve  
1. Foreign matter between  
control valve and  
burner  
1. Take apart gas tubing  
and remove foreign mat-  
ter  
Gas odor during com-  
bustion  
2. Gas leak. See Warn-  
ing statement at  
top of page  
2. Locate and correct all  
leaks (see CHECKING  
GAS CONNECTIONS,  
page 10)  
You may have further questions about installation, operation, or troubleshooting.  
If so, contact DESA International’s Technical Service Department at 1-800-323-  
5190.  
TECHNICAL  
SERVICE  
VN12  
VN6A  
6,000  
Natural Only  
Piezo  
SPECIFICATIONS  
B.T.U. (Variable)  
Type Gas  
Ignition  
6,000/12,000  
Natural Only  
Piezo  
Pressure Regulator Setting  
3" W.C.  
3" W.C.  
Inlet Gas Pressure (inches of water)  
Maximum  
Minimum  
10.5"  
4"  
10.5"  
4"  
Dimensions, Inches (H x W x D)  
Heater  
20 1/2 x 13 1/2 x 5  
25 x 16 11/16 x 7 1/2  
20 1/2 x 13 1/2 x 5  
25 x 16 11/16 x 7 1/2  
Carton  
Weight (pounds)  
Heater  
14  
17  
13  
16  
Shipping  
20  
 
When gas pressure is too low  
• pilot will not stay lit  
• burner(s) will have delayed ignition  
• heater will not produce specified heat  
When gas quality is bad  
SERVICE  
HINTS  
• pilot will not stay lit  
• burner(s) will produce flames and soot  
• heater will backfire when lit  
You may feel your gas pressure is too low or gas quality is bad. If so, contact your  
local natural gas supplier.  
Note: Use only original replacement parts. This will protect your warranty cover-  
age for parts replaced under warranty.  
REPLACEMENT  
PARTS  
Parts Under Warranty  
Contact authorized dealer from whom you purchased this product. If they cannot  
supply original replacement part(s), call DESA International’s Technical Service  
Department at 1-800-323-5190 for referral information.  
When contacting your dealer or DESA International, have ready:  
• your name  
• your address  
• model 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 Warranty  
Contact authorized dealers of this product. If they cannot supply original replace-  
ment part(s), call DESA International’s Parts Department at 1-800-972-7879.  
When calling DESA International, have ready:  
• model number of your heater  
• the replacement part number  
You can purchase a service manual from the address listed on the back page of this  
manual. Send a check for $5.00 payable to DESA International.  
SERVICE  
PUBLICATIONS  
Purchase this heater accessory from your local dealer. If they cannot supply this  
accessory, call DESA International’s Parts Department at  
1-800-972-7879. You can also write to the address  
ACCESSORY  
listed on the back page of this manual.  
MANUAL SHUTOFF  
VALVE - GA5010  
Manual shutoff valve with 1/8"  
NPT tap.  
21  
 
This list contains replaceable parts used in your heater. When ordering parts, follow  
the instructions listed under REPLACEMENT PARTS on page 21 of this manual.  
PARTS LIST  
VN6A  
KEY PART  
KEY PART  
NO.  
NUMBER  
DESCRIPTION  
QTY. NO.  
NUMBER  
DESCRIPTION  
QTY.  
1
2
3
4
5
6
7
098304-01  
099467-01  
099318-01  
098342-01  
099469-01  
M15823-37  
503329  
Screw, #10 x 3/8"  
Front Panel Assembly  
Grill Guard  
2
1
1
2
1
9
1
1
1
1
1
1
1
1
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
099384-01  
099057-01  
098276-01  
099468-03  
099415-01  
098303-02  
098508-01  
099393-01  
M11084-26  
099818-01  
Control Valve  
Pressure Tap Fitting  
1/8 Pipe Plug  
Cabinet Assembly  
Gas Regulator  
Screw, #6 x 5/16"  
Valve Retainer Nut  
Control Knob  
1
1
1
1
1
2
1
1
2
1
Grill Guard Clip  
Reflector Assembly  
Screw Hex #8 x 1/4"  
ODS/Pilot Assembly  
Thermocouple  
Ignitor Electrode  
Burner Assembly  
Injector  
Tubing - Valve to burner  
Pilot Tubing - Valve to pilot  
Tubing - Regulator to valve  
7-1 098514-01  
7-2 098594-01  
099884-01  
Screw, #10 x 3/8"  
Internal Tooth Washer  
8
9
099056-04  
PARTS AVAILABLE - NOT SHOWN  
10  
11  
12  
099390-01  
099387-05  
099391-02  
099395-01  
Control Position Label  
1
20  
19  
22  
ILLUSTRATED  
PARTS  
16  
BREAKDOWN  
VN6A  
HEATER EXPLODED VIEW  
8
4
7
18  
17  
6
21  
13  
5
14  
6
11  
3
10  
15  
7-1  
7-2  
9
12  
2
1
ODS/PILOT  
22  
 
This list contains replaceable parts used in your heater. When ordering parts, follow  
the instructions listed under REPLACEMENT PARTS on page 21 of this manual.  
PARTS LIST  
VN12  
KEY PART  
KEY PART  
NO.  
NUMBER  
DESCRIPTION  
QTY. NO.  
NUMBER  
DESCRIPTION  
QTY.  
1
2
3
4
5
6
7
098304-01  
099467-01  
099318-01  
098342-01  
099469-02  
M15823-37  
503329  
Screw, #10 x 3/8"  
Front Panel Assembly  
Grill Guard  
2
1
1
2
1
13  
14  
15  
16  
17  
099391-02  
099385-01  
099057-01  
098276-01  
099468-02  
099415-01  
098303-02  
098508-01  
099393-01  
M11084-26  
099818-01  
Tubing - Regulator to valve  
Control Valve  
Pressure Tap Fitting  
1/8 Pipe Plug  
Cabinet Assembly  
Gas Regulator  
Screw, #6 x 5/16"  
Valve Retainer Nut  
Control Knob  
1
1
1
1
1
1
2
1
1
2
1
Grill Guard Clip  
Reflector Assembly  
Screw Hex #8 x 1/4"  
ODS/Pilot Assembly  
Thermocouple  
Ignitor Electrode  
Burner Assembly  
Injector  
Tubing - Valve to plaque A  
Pilot Tubing - Valve to pilot  
Tubing - Valve to plaque B  
10 18  
1
1
1
1
2
1
1
1
19  
20  
21  
22  
23  
7-1 098514-01  
7-2 098594-01  
099884-02  
8
9
Screw, #10 x 3/8"  
Internal Tooth Washer  
099056-04  
10  
11  
12  
099390-02  
099387-05  
099392-01  
PARTS AVAILABLE - NOT SHOWN  
099395-02  
Control Position Label  
1
17  
21  
20  
23  
ILLUSTRATED  
PARTS  
BREAKDOWN  
VN12  
HEATER EXPLODED VIEW  
8
4
A
7
B
19  
18  
6
22  
14  
5
15  
6
11  
3
10  
16  
7-1  
7-2  
9
13  
2
9
12  
1
ODS/PILOT  
23  
 
WARRANTY INFORMATION  
KEEP THIS WARRANTY  
Model  
Serial No.  
Date Purchased  
Always specify model and serial numbers when communicating with the factory.  
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our  
standard written warranty. We make no other warranty, expressed or implied.  
LIMITED WARRANTY  
VANGUARD VENT-FREE RESIDENTIAL GAS HEATERS  
DESA International warrants this product and any parts thereof, to be free from defects in material and  
workmanship for two years from the date of first purchase, provided that the product has been properly  
installed, operated, and maintained in accordance with all applicable instructions. To make a claim under this  
warranty, the bill of sales or proof of purchase must be presented.  
This warranty is extended only to the original retail purchaser. This warranty covers only the cost of parts and  
labor required to restore this heater to proper operating condition. Warranty parts must be obtained through  
authorized dealers of this product and/or DESA International who will provide original factory replacement  
parts. Failure to use original factory replacement parts voids this warranty. The heater must be installed by a  
qualified installer in accordance with all local codes and instructions furnished with the unit.  
This warranty does not apply to parts that are not in original condition because of normal wear and tear, or  
parts that fail or become damaged as a result of misuse, accidents, lack of proper maintenance, alteration,  
tampering, contaminated fuels, or defects caused by improper installation. Travel, transportation, and incidental  
costs associated with warranty repairs are not reimbursable under this warranty and are the responsibility of the  
owner.  
To the full extent allowed by the law of the jurisdiction that governs the sale of the product: this express  
warranty excludes any and all other expressed warranties and limits the duration of any and all implied  
warranties, including warranties of merchantability and fitness for a particular purpose to two years from the  
date of first purchase: and DESA International’s liability is hereby limited to the purchase price of the product  
and DESA International shall not be liable for any other damages whatsoever including indirect, incidental, or  
consequential damages.  
Some states do not allow a limitation of how long an implied warranty lasts or an exclusion or limitation of  
incidental or consequential damages, so the above limitation of implied warranties, or exclusion, or limitation  
of damages may not apply to you.  
This warranty provides the original retail purchaser with specific legal rights. For specific information regard-  
ing those rights, please consult the applicable state laws.  
2701 Industrial Drive  
P.O. Box 90004  
099399-01  
Bowling Green, KY 42102-9004  
REV. G  
5/94  
 

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