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OWNER'S OPERATION AND INSTALLATION MANUAL
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.
FOR YOUR SAFETY
— 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.
• 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.
— Installation and service must be per-
formed by a qualified installer, service
agency, or the gas supplier.
VENTED NATURAL
GAS HEATERS
Models: GVB35N and GVB50N
Save this manual for future reference.
®
WARNING
: Improper installation,
adjustment, alteration, service, or
maintenance can cause property
damage, personal injury or loss of
life. Refer to this manual for cor-
rect installation and operational
procedures. For assistance or
additional information consult a
qualified installer, service agency,
or the gas supplier.
®
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Table of Contents
Related Manuals for Desa GVB35N
Summary of Contents for Desa GVB35N
- Page 1 VENTED NATURAL GAS HEATERS OWNER’S OPERATION AND INSTALLATION MANUAL Models: GVB35N and GVB50N 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.
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Page 2: Table Of Contents
CONTENTS SECTION Safety Information ... 3 Product Identification ... 5 Local Codes ... 6 Unpacking ... 6 Product Features ... 6 Installing Heater ... 6 Check Gas Type ... 6 Installation Items... 6 Locating Heater ... 7 Venting Heater ... 8 Connecting to Gas Supply ... -
Page 3: Safety Information
SAFETY INFORMATION 100353 WARNINGS IMPORTANT: Read this owner’s manual carefully and completely be- fore trying to assemble, operate, 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. Carbon monoxide poisoning may lead to death! Carbon Monoxide Poisoning: Early signs of carbon monoxide poisoning resemble the flu, with headaches, dizziness, or nausea. - Page 4 SAFETY INFORMATION Continued WARNINGS 6. Provide the following minimum heater clearances from combustibles (as viewed from the front of heater): Front: 48 inches Back: 6 inches Top: 53 inches Right Side: 12 inches Left Side: 6 inches 7. Do not run heater •...
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Page 5: Product Identification
PRODUCT IDENTIFICATION 100353 Lower Front Access Panel Figure 1 - Vented Natural Gas Heater Draft Hood Outlet for Venting System Control Valve Figure 2 - Vented Natural Gas Heater, Rear View Control Knob Ignitor Button... -
Page 6: Local Codes
LOCAL CODES UNPACKING PRODUCT FEATURES INSTALLING HEATER Install and use heater with care. Follow all local codes. In the absence of local codes, use the latest edition of the following: • National Fuel Gas Code ANSI Z223.1, also known as NFPA 54 * •... -
Page 7: Locating Heater
INSTALLING HEATER Continued 100353 LOCATING HEATER Maintain the minimum clearances shown in Figure 3, below. If you can, provide greater clearances. Never install the heater • in a mobile home or a recreational vehicle. • where curtains, furniture, clothing, or other flammable objects are less than 48 inches from the front, 53 inches from the top, 12 inches from the right side and 6 inches from the left side and back of heater. -
Page 8: Venting Heater
INSTALLING HEATER Continued VENTING HEATER Note: Venting/chimney materials are not supplied with heater. A qualified service person must install the venting system for this heater. If venting system is not properly installed and maintained, the vent safety shut-off system will pre- vent the heater from running. -
Page 9: Installing Heater
INSTALLING HEATER Continued 100353 VENTING HEATER (continued) Do not vent heater in any of the following ways (see Figure 4). Heater must be vented to the out- doors. Never vent heater to another room or inside a building. Never extend vent pipe horizontally through outside wall and terminate. - Page 10 INSTALLING HEATER Continued VENTING HEATER (continued) Proper Size Vent To safely vent heater, the vent connector pipe must be the same diameter as the draft hood outlet on the rear of the heater. Pipe that is too small can cause flue gas to spill from the heater.
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Page 11: Connecting To Gas Supply
INSTALLING HEATER Continued 100353 CONNECTING TO GAS SUPPLY A qualified service person must connect heater to gas supply. Follow all local codes. Never connect heater to private (non-utility) gas wells. This gas is commonly known as well-head gas. Check gas line pressure at gas meter before connecting heater to gas IMPORTANT: line. - Page 12 INSTALLING HEATER Continued Installation must include a manual shutoff valve, ground joint union, plugged 1/8" NPT tap, and a sediment trap. Locate NPT tap within reach for test gauge hook up. NPT tap must be upstream from heater (see Figure 7). Apply pipe joint sealant lightly to male threads.
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Page 13: Checking Gas Connections
INSTALLING HEATER Continued 100353 CHECKING GAS CONNECTIONS Test all gas piping and connections for leaks after install- ing or servicing. Correct all leaks at once. 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. -
Page 14: Installing Glass Panels
INSTALLING HEATER Continued INSTALLING GLASS PANEL 1. Locate the glass panel package inside the back of the heater. Before installing glass panels, inspect the edges. If you notice any chips or cracks, do not install. If the surface on either side is deeply scratched, do not install. If these conditions exist, contact your Vanguard dealer for replacement glass panels. - Page 15 INSTALLING HEATER Continued 100353 6. Insert top edge of glass panel into the upper glass retaining channel (see Figure 11). Glass Panel Lower Front Access Area Figure 10 - Inserting Glass Panels Make sure you insert top edge of glass panels into the upper glass retaining channel.
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Page 16: Fresh Air For Combustion And Ventilation
FRESH AIR FOR COMBUSTION VENTILATION This heater must have fresh air for proper operation. If not, poor fuel combustion and improper venting of flue gases will result. Carbon monoxide poisoning from backed-up flue gases could occur. Read the following instructions to insure proper fresh air for this and other fuel-burning appliances in your home. -
Page 17: Determining Fresh-Air Flow For Heater Location
FRESH AIR FOR COMBUSTION VENTILATION Continued 100353 DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION Example 1: Locating Heater in Unconfined (Open) Area An unconfined area has a minimum air volume of 50 cubic feet for each 1000 BTU/Hr input rating of all appliances in the area (cubic feet equals length x width x height of area). -
Page 18: Providing Permanent Fresh-Air Ventilation
FRESH AIR FOR COMBUSTION VENTILATION Continued This is a hazardous situation. Draft hood spillage re- Draft Hood Spillage: leases poisonous carbon monoxide gas into your home. Carbon monoxide poisoning may lead to death! If draft hood spillage occurs, check for blocked flue connectors, vent pipes, and chimneys. -
Page 19: Example 2: Locating Heater In Confined (Closed) Area
FRESH AIR FOR COMBUSTION VENTILATION Continued 100353 Example 2: Locating Heater in Confined (Closed) Area A confined area has an air volume of less than 50 cubic feet for each 1000 BTU/Hr input rating of all appliances in the area (cubic feet equals length x width x height of area). -
Page 20: Operating Heater
OPERATING HEATER Heater and venting system surfaces are very hot during operation. Keep children and adults away from hot surfaces to avoid burns and clothing ignition. Carefully supervise young children when they are in the same room as heater. Heater will remain hot for a time after shut down. Let surface cool before touching. - Page 21 OPERATING HEATER Continued 100353 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 20. If you don’t smell gas, go to the next step. Turn control knob clockwise control knob for five seconds.
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Page 22: Manual Lighting Procedure
OPERATING HEATER Continued MANUAL LIGHTING PROCEDURE 1. Remove lower front access panel on heater. 2. Locate pilot. Pilot is attached to the front of burner. 3. Follow steps 1 through 6 under Lighting Instructions, pages 20 and 21. 4. With control knob depressed, strike match. Hold match to pilot until pilot lights. 5. -
Page 23: Inspecting Pilot And Burner Flame
INSPECTING PILOT AND BURNER FLAME 100353 Check pilot flame pattern and burner flame pattern often. PILOT FLAME PATTERN Figure 18 shows a correct pilot flame pattern. Figure 19 shows an incorrect pilot flame pattern. The incorrect pilot flame is not touching the thermocouple. This will prevent the thermocouple from getting hot, causing the heater to shut down. - Page 24 INSPECTING PILOT AND BURNER FLAME Continued Sharp Blue Flame Figure 20 - Correct Burner Flame Pattern High Yellow Flame Flame Lifting Off of Burner Figure 21 - Incorrect Burner Flame Patterns If burner flame pattern is incorrect, as shown in Figure 21 •...
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Page 25: Cleaning And Maintenance
CLEANING MAINTENANCE 100353 Turn off heater and let cool before cleaning or servicing. Keep heater clear and free from combustible materials, gasoline, and other flammable vapors and liquids. You must keep control areas, burner, and circulating air passageways of heater clean. Inspect these areas of heater before each use. -
Page 26: Troubleshooting
TROUBLE- SHOOTING Note: All troubleshooting items are listed in order of operation. Turn off and unplug heater and let cool before servicing. Unless you need gas supply for testing, shut off manual shutoff valve before servicing. Only a qualified service person should service and repair heater and venting system. - Page 27 TROUBLE- SHOOTING Continued 100353 OBSERVED POSSIBLE PROBLEM CAUSE Pilot lights but flame 1. Manual shutoff valve goes out when not fully open. control knob is 2. Control knob not fully released. pressed in. 3. Control pressed in long enough. 4. Safety interlock system has been triggered.
- Page 28 TROUBLE- SHOOTING Continued OBSERVED POSSIBLE PROBLEM CAUSE Burner backfiring 1. Burner orifice is during combustion. clogged or damaged. 2. Burner damaged. 3. Gas regulator defective. 4. Delayed ignition. Yellow flame during 1. Not enough air. burner combustion. 2. Gas regulator defective. Slight smoke or odor 1.
- Page 29 TROUBLE- SHOOTING Continued 100353 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.
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Page 30: Service Procedures
SERVICE PROCEDURES Removing Control Valve and Burner Tube 1. Shut off gas supply to heater. 2. Remove lower front access panel on heater. 3. Disconnect burner tube from orifice holder (see Figure 22). 4. Remove pilot gas line from control valve (see Figure 22). -
Page 31: Removing Burner
SERVICE PROCEDURES Continued Removing Burner 1. Shut off gas supply to heater. 2. Remove lower front access panel on heater. 3. Disconnect burner tube from orifice holder (see Figure 23). 4. Remove orifice holder from burner (see Figure 23). 5. Remove pilot burner bracket nuts and remove pilot assembly (see Figure 23). -
Page 32: Changing Burner Orifice
SERVICE PROCEDURES Continued Changing Burner Orifice 1. Shut off gas supply to heater. 2. Remove lower front access panel on heater. 3. Disconnect burner tube from orifice holder (see Figure 24). 4. Remove orifice holder from burner (see Figure 24). 5. -
Page 33: Technical Service
TECHNICAL SERVICE SPECIFICATIONS SERVICE HINTS 100353 You may have further questions about installation, operation, or troubleshooting. If so, contact DESA International’s Technical Service Department at 1-800-323- 5190. Type Gas Ignition Pressure Regulator Setting Inlet Gas Pressure Maximum Minimum Dimensions, Inches... -
Page 34: Ordering Replacement Parts
Usually, we will ask you to return the defective part to the factory. Parts Not Under Warranty Contact Vanguard dealer. If they can’t supply original replacement part(s), either contact your nearest Parts Central (below) or call DESA International’s Parts Department at 1-800-972-7879. When calling DESA International, have ready •... -
Page 35: Accessories
Purchase these heater accessories from your local dealer. If they can not supply these accessories, either contact your nearest Parts Central (see page 34) or call DESA International’s Parts Department at 1-800-972-7879. You can also write to the address listed on the back page of this manual. -
Page 36: Illustrated Parts List
ILLUSTRATED PARTS LIST Burner Assembly 24-1 24-3 24-4 24-2 50 Model 35 Model 100353... - Page 37 098249-01 530192 098304-01 100353 This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Ordering Replacement Parts on page 34 of this manual. GVB35N DESCRIPTION 100206-01 Combustion Chamber 098324-02 Control Knob 097159-02 Piezo Ignitor...
- Page 38 100154-01 This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Ordering Replacement Parts on page 34 of this manual. PART NUMBER FOR GVB35N DESCRIPTION 100202-01 Lower Front Panel 098304-01 Screw, #10-16 x 3/8"...
- Page 39 NOTES _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ 100353...
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Page 40: Warranty Information
Defective parts must be returned to DESA, transportation charges prepaid, (DESA is not responsible for any freight charges), where DESA will establish to its sole satisfaction that the part was or became defective under normal use and maintenance.