Page 2 - CONTENTS; SECTION; WARNINGS; Read this Owner’s Manual carefully and completely; DANGER; Carbon monoxide poisoning may lead to death!; Early signs of carbon monoxide poisoning; SAFETY
2 100845 CONTENTS SECTION PAGE Safety Information ......................................................................... 2 Product Identification .................................................................... 4 Local Codes .......................................................................
Page 3 - Continued
3 100845 SAFETY INFORMATION Continued WARNING ICON G 001 WARNINGS Continued WARNING: Any change to this heater or its controls can be dangerous. 1. Use only natural gas. Do not convert heater to use different fuel type. 2. If you smell gas • shut off gas supply• do not try to light any appliance• do...
Page 4 - Safety Device
4 100845 PRODUCT IDENTIFICATION LOCAL CODES Install and use heater with care. Follow all local codes. In the absence of localcodes, use the latest edition of National Fuel Gas Code ANSI Z223.1, also knownas NFPA 54*. *Available from: American National Standards Institute, Inc. 1430 Broadway New York...
Page 5 - WARNING; PRODUCING ADEQUATE VENTILATION; Unusually Tight Construction; and; Unconfined Space
5 100845 FRESH AIR FOR COMBUSTION AND VENTILATION WARNING ICON G 001 WARNING This heater must have fresh air for proper operation. If not, poorfuel combustion could result. Read the following instructions toinsure proper fresh air for this and other fuel-burning appliancesin your home. Today’s homes...
Page 6 - You must provide additional ventilation air in a confined space.; DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION; Determining if You Have a Confined or Unconfined Space
6 100845 FRESH AIR FOR COMBUSTION AND VENTILATION Continued WARNING ICON G 001 WARNING You must provide additional ventilation air in a confined space. DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION Determining if You Have a Confined or Unconfined Space Use this worksheet to determine if you have a ...
Page 7 - Ventilation Air From Inside Building; Figure 2 - Ventilation Air from Inside Building
7 100845 FRESH AIR FOR COMBUSTION AND VENTILATION Continued VENTILATION AIR Ventilation Air From Inside Building This fresh air would come from an adjoining unconfined space. When ventilating to anadjoining unconfined space, you must provide two permanent openings: one within 12" of theceiling a...
Page 8 - Ventilation Air From Outdoors; Figure 3 - Ventilation Air from Outdoors
8 100845 FRESH AIR FOR COMBUSTION AND VENTILATION Continued VENTILATION AIR (Continued) Ventilation Air From Outdoors Provide extra fresh air by using ventilation grills or ducts. You must provide two perma-nent openings: one within 12" of the ceiling and one within 12" of the floor. Connect...
Page 9 - NOTICE; CHECK GAS TYPE; This heater is designed to be mounted on a wall.; Never install the heater; CAUTION; If you install the heater in a home garage
9 100845 INSTALLING TO WALL Continued 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. Calldealer where you bought heater for proper type heater. INSTALLATION ITEMS Before ins...
Page 10 - INSTALLING HEATER TO WALL; Marking Screw Locations; Determine where you will locate heater.; JOINING WALL; INSTALLING; For convenience and efficiency, install heater
10 100845 2. Mark two mounting screw locations on wall (see Figure 5). INSTALLING HEATER TO WALL Marking Screw Locations 1. Determine where you will locate heater. Figure 5 - Mounting Screw Locations Mounting Screw Locations 10 7/8" Minimum To Maintain 8" Clearance From Wall 7 3/4" 20 1/...
Page 11 - Figure 7 - Popping Open Anchor Wings For Thin Walls; Installing Two Mounting Screws; package is provided with heater.; Attaching to wall stud method; Figure 8 - Tightening Anchors
11 100845 5. Tighten two screws until 1/16" space (thickness of penny) is between screwheads and wall (see Figure 8). Figure 7 - Popping Open Anchor Wings For Thin Walls Thin Walls(1/4" to 1/2" thick) Installing Two Mounting Screws Note: Wall anchors and mounting screws are in hardware p...
Page 12 - Placing Heater On Mounting Screws; are in small portion of slots.; Figure 11 - Installing Bottom Mounting Screw; Removing Front Panel Of Heater; Figure 10 - Removing Front Panel Of Heater; Installing Bottom Mounting Screw
12 100845 Placing Heater On Mounting Screws 1. Locate two keyhole slots on back panel of heater (see Figure 9).2. Place large openings of slots over screwheads. Slide heater down until screws are in small portion of slots. Figure 11 - Installing Bottom Mounting Screw Figure 9 - Location Of Keyhole S...
Page 14 - Figure 12 - Gas Connection; PRESSURE TESTING GAS SUPPLY PIPING SYSTEM; Test Pressures In Excess Of 1/2 PSIG; opening main gas valve located on or near gas meter.
14 100845 IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping and/or fittings. Figure 12 - Gas Connection * An A.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an acceptablealternative to test gauge connection. Purchase the optional A.G.A. design-cert...
Page 15 - water to gas joints. Bubbles forming show a leak.; Test Pressures Equal To or Less Than 1/2 PSIG; gas valve located on or near gas meter.; PRESSURE TESTING HEATER GAS CONNECTIONS; internal joints for leaks.; Figure 13 - Manual Shutoff Valve; Figure 14 - Checking Gas Joints; CHECKING
15 100845 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 13).2. Pressurize supply piping system b...
Page 16 - FOR YOUR SAFETY READ BEFORE LIGHTING; LIGHTING INSTRUCTIONS; Figure 15 - Control Knob In The OFF Position (Model VN12A Shown)
16 100845 OPERATING HEATER FOR YOUR SAFETY READ BEFORE LIGHTING 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...
Page 17 - OPERATING
17 100845 7. Keep control knob pressed in for 10 seconds after lighting pilot. After 10 seconds, release control knob. Note: If pilot goes out, repeat steps 3 through 7. 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...
Page 18 - TO SELECT HEATING LEVEL; Slightly press in control knob and turn counterclockwise
18 100845 TO SELECT HEATING LEVEL 1. Slightly press in control knob and turn counterclockwise C-clockwise to the LOW or HIGH positions (VN12A) or ON position (VN6B). IMPORTANT: Release downward pressure while turning control knob. Control knob will lock at the desired position. Figure 17 - Burner Pa...
Page 19 - to the OFF position.; to the PILOT position.; MANUAL LIGHTING PROCEDURE; If pilot flame pattern is incorrect, as shown in Figure 19; Check pilot flame pattern and burner flame pattern often.; PILOT FLAME PATTERN; INSPECTING; Figure 19 - Incorrect Pilot Flame Pattern
19 100845 Shutting Off Heater 1. Turn control knob clockwise Clockwise to the OFF position. Shutting Off Burner Only (pilot stays lit) 1. Turn control knob clockwise Clockwise to the PILOT position. MANUAL LIGHTING PROCEDURE 1. Remove front panel (see Figure 10, page 12).2. Follow steps 1 through 5 ...
Page 20 - BURNER FLAME PATTERN; Figure 21 - Incorrect Burner Flame Pattern (Model VN12A Shown); If burner flame pattern is incorrect, as shown in Figure 21; CLEANING; ODS/PILOT AND BURNER ORIFICE; Air Passageways; • Use a vacuum cleaner or pressurized air to clean.; Exterior; cabinet to remove dust.; Turn off heater and let cool before cleaning.
20 100845 BURNER FLAME PATTERN Figure 20 shows a correct burner flame pattern. Figure 21 shows an incorrectburner flame pattern. Figure 20 - Correct Burner Flame Pattern (Model VN12A Shown) Figure 21 - Incorrect Burner Flame Pattern (Model VN12A Shown) If burner flame pattern is incorrect, as shown ...
Page 21 - SHOOTING; REMEDY
21 100845 TROUBLE- SHOOTING POSSIBLECAUSE 1. Ignitor electrode posi- tioned wrong 2. Ignitor electrode broken3. Ignitor electrode not connected to ignitorcable 4. Ignitor cable pinched or wet 5. Piezo ignitor nut is loose 6. Broken ignitor cable7. Bad piezo ignitor 1. Gas supply turned off or manual...
Page 23 - If you smell gas
23 100845 POSSIBLECAUSE 1. Plaque damaged2. Inlet gas pressure is too low 3. Control knob set between lockedpositions 1. Residues from manu- facturing processes 1. Metal expanding while heating or contractingwhile cooling 1. Heater burning vapors from paint, hair spray,glues, etc. See IMPOR- TANT st...
Page 24 - TECHNICAL; SPECIFICATIONS
24 100845 OBSERVEDPROBLEM Gas odor even whencontrol knob is inOFF position Gas odor duringcombustion REMEDY 1. Locate and correct all leaks (see CheckingGas Connections, page14) 2. Replace control valve 1. Take apart gas tubing and remove foreignmatter 2. Locate and correct all leaks (see CheckingGa...
Page 25 - for parts replaced under warranty.; Parts Under Warranty; When contacting your dealer or DESA International, have ready:; Parts Not Under Warranty; When calling DESA International, have ready:
25 100845 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 • pilot will not stay lit• burner(s) will produce flames and soot• heater will backfire when lit You may feel your gas pressure is to...
Page 26 - PARTS LIST; HEATER EXPLODED VIEW; ILLUSTRATED
26 100845 KEY PART NO. NUMBER DESCRIPTION QTY. 1 098304-01 Screw, #10 x 3/8" 2 2 099467-01 Front Panel Assembly 1 3 099318-03 Grill Guard 1 4 098342-01 Grill Guard Clip 2 5 099469-01 Reflector Assembly 1 6 M15823-37 Screw Hex #8 x 1/4" 9 7 503329 ODS/Pilot Assembly 1 7-1 098514-01 Thermocoup...
Page 28 - KEEP THIS WARRANTY; WARRANTY INFORMATION
LIMITED WARRANTY VANGUARD VENT-FREE RESIDENTIAL GAS HEATERS DESA International warrants this product and any parts thereof, to be free from defects in material andworkmanship for two years from the date of first purchase, provided that the product has been properlyinstalled, operated, and maintained...