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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: CGB35N and CGB50N
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 Comfort Glow CGB35N
Summary of Contents for Desa Comfort Glow CGB35N
- Page 1 VENTED NATURAL GAS HEATERS OWNER’S OPERATION AND INSTALLATION MANUAL Models: CGB35N and CGB50N 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 Fresh Air For Combustion and Ventilation ... 16 Operating Heater ... 20 Inspecting Pilot and Burner Flame ... 23 Cleaning and Maintenance ... -
Page 3: Safety Information
SAFETY INFORMATION 100351 WARNINGS WARNING ICON G 001 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. - Page 4 SAFETY INFORMATION 6. Provide the following minimum heater clearances from combustibles (as viewed Continued 7. Do not run heater 8. Never place clothing or any flammable objects on the heater or venting system. 9. Heater and venting system surfaces are very hot during operation. Keep children 10.
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Page 5: Product Identification
PRODUCT IDENTIFICATION 100351 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 Install and use heater with care. Follow all local codes. In the absence of local codes, use the latest edition of the following: *Available from: UNPACKING 1. Remove heater from carton. 2. Remove all protective packaging applied to heater for shipment. 3. -
Page 7: Locating Heater
INSTALLING HEATER Continued 100351 LOCATING HEATER WARNING ICON G 001 Maintain the minimum clearances shown in Figure 3, below. If you can, provide greater clearances. WARNING ICON G 001 Never install the heater • in a mobile home or a recreational vehicle. •... -
Page 8: Venting Heater
INSTALLING VENTING HEATER Note: HEATER Continued Venting/chimney materials are not supplied with heater. WARNING WARNING ICON G 001 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 100351 VENTING HEATER (continued) WARNING WARNING ICON G 001 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 VENTING HEATER HEATER Continued (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 100351 CONNECTING TO GAS SUPPLY WARNING ICON G 001 A qualified service person must connect heater to gas supply. Follow all local codes. WARNING ICON G 001 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 Test Gauge Connection* 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 100351 CHECKING GAS CONNECTIONS WARNING ICON G 001 Test all gas piping and connections for leaks after install- ing or servicing. Correct all leaks at once. 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. -
Page 14: Installing Glass Panels
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, call DESA International’s Technical Ser- vice Department at 1-800-323-5190 for replacement glass panels. - Page 15 If you have chipped or cracked a glass panel during installation, do not Note: use. Contact DESA International’s Technical Service Department at 1-800- 323-5190 for a replacement glass panel. 8. Repeat steps 4 through 7 for all glass panels.
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Page 16: Fresh Air For Combustion And Ventilation
FRESH AIR FOR COMBUSTION VENTILATION Today’s homes are built more energy efficient than ever. New materials, increased insulation, and new construction methods help reduce heat loss in homes. Home owners weather strip and caulk around windows and doors to keep the cold air out and the warm air in. -
Page 17: Determining Fresh-Air Flow For Heater Location
FRESH AIR FOR COMBUSTION VENTILATION Continued 100351 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. WARNING ICON 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 100351 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 A. This appliance has a pilot which must be lighted by hand. When lighting the B. BEFORE LIGHTING smell all around the appliance area for gas. Be sure to C. Use only your hand to push in or turn the gas control knob. Never use tools. If D. - Page 21 OPERATING HEATER Continued 100351 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 Clockwise control knob for five seconds.
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Page 22: Manual Lighting Procedure
OPERATING MANUAL LIGHTING PROCEDURE HEATER 1. Remove lower front access panel on heater. Continued 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 100351 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 20 •...
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Page 25: Cleaning And Maintenance
CLEANING MAINTENANCE 100351 WARNING ICON G 001 Turn off heater and let cool before cleaning or servicing. WARNING ICON G 001 Keep heater clear and free from combustible materials, gasoline, and other flammable vapors and liquids. WARNING ICON G 001 You must keep control areas, burner, and circulating air passageways of heater clean. -
Page 26: Troubleshooting
TROUBLE- SHOOTING Note: All troubleshooting items are listed in order of operation. WARNING ICON G 001 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 100351 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 OBSERVED TROUBLE- PROBLEM SHOOTING Burner backfiring Continued during combustion. Yellow flame during burner combustion. Slight smoke or odor during initial operation. Burner fails to re- spond to thermostat. Heater produces a whistling noise when burner is lit. POSSIBLE REMEDY CAUSE 1.
- Page 29 TROUBLE- SHOOTING Continued 100351 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. •...
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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 100351 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 Model 35,000 Type Gas Natural Only Ignition Piezo Pressure Regulator Setting 3.5"... -
Page 34: Ordering Replacement Parts
Usually, we will ask you to return the defective part to the factory. Parts Not Under Warranty Contact your nearest 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 50 Model 35 Model 24-1 24-3 24-4 24-2 100351... -
Page 37: Parts List
098249-01 530192 098304-01 100351 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. CGB35N DESCRIPTION 100206-01 Combustion Chamber 098324-02 Control Knob 097159-02 Piezo Ignitor... -
Page 38: Illustrated Parts List
100154-02 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 CGB35N DESCRIPTION 100202-01 Lower Front Panel 098304-01 Screw, #10-16 x 3/8"... - Page 39 NOTES _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ 100351...
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Page 40: Warranty Information
LIMITED ONE YEAR WARRANTY This DESA product is warranted to the original purchaser to be free from defect in material and workmanship under normal use and maintenance for a period of one year from the date of installation whether or not actual use begins on that date. It is the responsibility of the consumer/owner to establish the warranty period.