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VENTED NATURAL
OWNER'S OPERATION AND INSTALLATION MANUAL
Models: GVC65NA, GVC50NA, GVC35NA
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.
GAS HEATERS
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 Vanguard GVC50NA
Summary of Contents for Desa Vanguard GVC50NA
- Page 1 VENTED NATURAL GAS HEATERS OWNER’S OPERATION AND INSTALLATION MANUAL Models: GVC65NA, GVC50NA, GVC35NA 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 100749 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 100749 Lower Front Access Panel Figure 1 - Vented Natural Gas Heater Draft Hood Outlet for Venting System Control Valve Blower (on models equipped with blower) 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 100749 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 flam- mable 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 Continued 100749 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 100749 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. IMPORTANT: Check gas line pressure at gas meter before connecting heater to gas 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 100749 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: 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 15: Determining Fresh-Air Flow For Heater Location
FRESH AIR FOR COMBUSTION VENTILATION Continued 100749 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 16: 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 17: Example 2: Locating Heater In Confined (Closed) Area
Recommended into Crawl Space in Furnace Area or in Closet with Water Heater Figure 11 - Ventilation Air from Inside Building After providing ventilation between rooms, check for draft hood spillage (see Draft Hood Spillage Test, page 15). If draft hood spillage still occurs, provide more ventilation between rooms or provide permanent ventilation from outdoors. -
Page 18: Operating Heater
OPERATING HEATER Heater and venting system surfaces are very hot during operation. Keep children and adults away from hot sur- faces to avoid burns and clothing ignition. Carefully super- vise young children when they are in the same room as heater. - Page 19 OPERATING HEATER Continued 100749 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 18. If you don’t smell gas, go to the next step. Remove lower front access panel on heater.
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Page 20: 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 7 under Lighting Instructions, pages 18 and 19. 4. With control knob depressed, strike match. Hold match to pilot until pilot lights. 5. -
Page 21: Inspecting Pilot And Burner Flame
INSPECTING PILOT AND BURNER FLAME 100749 Check pilot flame pattern and burner flame pattern often. PILOT FLAME PATTERN Figure 14 shows a correct pilot flame pattern. Figure 15 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 22 INSPECTING PILOT AND BURNER FLAME Continued Sharp Blue Flame Figure 16 - Correct Burner Flame Pattern High Yellow Flame Flame Lifting Off of Burner Figure 17 - Incorrect Burner Flame Patterns If burner flame pattern is incorrect, as shown in Figure 17. •...
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Page 23: Cleaning And Maintenance
CLEANING MAINTENANCE 100749 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 24: 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 25 TROUBLE- SHOOTING Continued 100749 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 knob not pressed in long enough.
- Page 26 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 27 TROUBLE- SHOOTING Continued 100749 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 28: 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 18). 4. Remove pilot gas line from control valve (see Figure 18). -
Page 29: 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 19). 4. Remove orifice holder from burner (see Figure 19). 5. Remove pilot burner bracket nuts and remove pilot assembly (see Figure 19). -
Page 30: 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 20). 4. Remove orifice holder from burner (see Figure 20). 5. -
Page 31: Technical Service
TECHNICAL SERVICE SPECIFICATIONS SERVICE HINTS ACCESSORIES 100749 You may have further questions about installation, operation, or troubleshooting. If so, contact DESA International’s Technical Service Department at 1-800-323- 5190. 35,000 BTU/Hr 50,000 BTU/Hr Model 35,000 Type Gas Natural Only Ignition Piezo Pressure Regulator Setting 3.5"... -
Page 32: 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 for information. When calling DESA International, have ready •... -
Page 33: Illustrated Parts List
100157-01 099987-01 100154-01 100749 This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Ordering Replacement Parts on page 32 of this manual. PART NUMBER FOR GVC50NA GVC35NA 100202-02 100202-01 098304-01 098304-01 100046-02BS... - Page 34 ILLUSTRATED PARTS LIST Burner Assembly 50 and 65 Models 35 Model Only 100749...
- Page 35 M12461-25 098249-01 100090-01 100749 This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Ordering Replacement Parts on page 32 of this manual. PART NUMBER FOR GVC50NA GVC35NA 100729-05 100729-04 098324-02 098324-02 097159-02...
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Page 36: 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.