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UNVENTED (VENT-FREE)
BLUE FLAME GAS HEATER
SAFETY INFORMATION AND
INSTALLATION MANUAL
For more information, visit www.desatech.com
For more information, visit www.desatech.com
CBN20, CBP20
CBN20T, CBP20T
CBN30T, CBP30T
CBT20NT, CBT20PT
CBT30NT, CBT30PT
CBN20TK, CBP20TK
WARNING: Improper installation,
WARNING: If the information in this manual is not
adjustment, alteration, service, or
followed exactly, a fire or explosion may result caus-
maintenance can cause injury or
ing property damage, pers
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TABLE OF CONTENTS 2 SAFETY INFORMATION TABLE OF CONTENTS SAFETY INFORMATION ............................................................ 2 SERVICE HINTS....................................................................... 16 LOCAL CODES ........................................................................... 3 TECHNICAL SERVICE ............................................................. 16 PRODUCT IDENTIFICATION ..................................................... 3 SERVICE PUBLICATIONS
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SAFETY INFORMATION 3 LOCAL CODES 3 PRODUCT IDENTIFICATION UNPACKING PRODUCT FEATURES SAFETY INFORMATION PRODUCT IDENTIFICATION 3. If you smell gas Control Knob & Ignitor Button • shut off gas supply (not seen from this view) Heater • do not try to light any appliance Cabinet • 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 t
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AIR FOR COMBUSTION AND VENTILATION Providing Adequate Ventilation 4 AIR FOR COMBUSTION AND VENTILATION Unusually tight construction is defined as construction WARNING: This heater shall not be installed in a where: confined space or unusually tight construction un- a. walls and ceilings exposed to the outside atmosphere less provisions are provided for adequate combustion have a continuous water vapor retarder with a rating and ventilation air. Read the following instructions to -11 2 of one pe
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AIR FOR COMBUSTION AND VENTILATION 5 Determining Fresh-Air Flow For Heater Location 5 AIR FOR COMBUSTION AND VENTILATION Continued 4. Compare the maximum Btu/Hr the space can support with the actual DETERMINING FRESH-AIR FLOW FOR amount of Btu/Hr used. HEATER LOCATION __________________ Btu/Hr (maximum the space can support) Determining if You Have a Confined or __________________ Btu/Hr (actual amount of Btu/Hr used) Unconfined Space Example: 51,200 Btu/Hr (maximum the space can support) Use th
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AIR FOR COMBUSTION AND VENTILATION Ventilation Air 6 AIR FOR COMBUSTION AND VENTILATION Continued VENTILATION AIR 12" Ventilation Air From Inside Building This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining unconfined space, you must Ventilation Grills provide two permanent openings: one within 12" of the ceiling and Into Adjoining Room, Ventilation one within 12" of the floor on the wall connecting the two spaces Option 2 Grills Or (see options 1 and
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INSTALLATION 7 Check Gas Type 7 Installation Items Locating Heater INSTALLATION NOTICE: This heater is intended for use as supple- WARNING: Never install the heater mental heat. Use this heater along with your primary • in a bedroom or bathroom heating system. Do not install this heater as your • in a recreational vehicle primary heat source. If you have a central heating • where curtains, furniture, clothing, or other flam- system, you may run system’s circulating blower mable objects are less
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INSTALLATION Thermostat Sensing Bulb 8 Installing Heater To Wall INSTALLATION Continued THERMOSTAT SENSING BULB Removing Front Panel Of Heater 1. Remove the four painted screws, two on each side of front panel. The thermostat sensing bulb has been placed inside the heater for protection during shipping. 2. Pull bottom of front panel forward, then out. 3. Remove any remaining packaging materials. Locating Thermostat Sensing Bulb (for thermostat applications) 1. Remove front panel of heater (see F
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INSTALLATION 9 Installing Heater To Wall (Cont.) 9 INSTALLATION Continued 2. Mark screw locations on wall (see Figure 8). Attaching To Wall Anchor Method Note: Only mark last hole on each end of mounting bracket. For attaching mounting bracket to hollow walls (wall areas between Insert mounting screws through these holes only. studs) or solid walls (concrete or masonry) 3. Remove tape and mounting bracket from wall. 1. Drill holes at marked locations using 5/16" drill bit. For solid walls (concr
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INSTALLATION Installing Heater To Wall (Cont.) 10 Mounting Heater To Floor INSTALLATION Continued Installing Bottom Mounting Screws MOUNTING HEATER TO FLOOR 1. Locate two bottom mounting holes. These holes are near bot- Mounting Base Feet to Heater tom on back panel of heater (see Figure 12). 1. Lay heater cabinet on its back on a table with the heater bot- 2. Mark screw locations on wall. tom overhanging the table edge. 3. Remove heater from mounting bracket. 2. Align holes in base foot with mo
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INSTALLATION 11 Connecting To Gas Supply 11 INSTALLATION Continued Typical Inlet Pipe Diameters CONNECTING TO GAS SUPPLY 20,000 Btu/Hr Models - 3/8" or greater WARNING: This appliance requires a 3/8" NPT 30,000 Btu/Hr Models - 1/2" or greater (National Pipe Thread) inlet connection to the pres- Installation must include equipment shutoff valve, union, and sure regulator. plugged 1/8" NPT tap. Locate NPT tap within reach for test gauge hook up. NPT tap must be upstream from heater (see Figure 15
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INSTALLATION Checking Gas Connections 12 INSTALLATION Continued CHECKING GAS CONNECTIONS Pressure Testing Heater Gas Connections 1. Open equipment shutoff valve (see Figure 16). WARNING: Test all gas piping and connections, 2. For natural gas open main gas valve located on or near gas internal and external to unit, for leaks after installing meter. For propane/LP gas open propane/LP supply tank valve. or servicing. Correct all leaks at once. 3. Make sure control knob of heater is in the OFF pos
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OFF HI OPERATING HEATER 13 For Your Safety Read Before Lighting 13 Lighting Instructions OPERATING HEATER Note: You may be running this heater for the first time FOR YOUR SAFETY READ after hooking up to gas supply. If so, the control knob may BEFORE LIGHTING need to be pressed in for 30 seconds or more. This will al- low air to bleed from the gas system. • If control knob does not pop up when released, contact a WARNING: If you do not follow these instructions qualified service person or gas su
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OPERATING HEATER To Turn Off Gas To Appliance 14 Thermostat Control Manual Lighting Procedure INSPECTING HEATER Pilot Flame Pattern OPERATING HEATER INSPECTING HEATER Continued Check pilot flame pattern and burner flame pattern often. PILOT FLAME PATTERN TO TURN OFF GAS TO APPLIANCE Figure 21 shows a correct pilot flame pattern. Figure 22 shows an incorrect pilot flame pattern. The incorrect pilot flame is not Shutting Off Heater touching the thermocouple. This will cause the thermocouple to 1.
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INSPECTING HEATER 15 Burner Flame Heater 15 CLEANING AND MAINTENANCE ODS/Pilot and Burner Cleaning Burner Pilot Air Inlet Cabinet ODS/PILOT AND BURNER INSPECTING HEATER • Use a vacuum cleaner, pressurized air, or small, soft bristled Continued brush to clean. BURNER FLAME PATTERN CLEANING BURNER PILOT AIR INLET The primary air inlet holes allow the proper amount of air to mix with WARNING: If yellow tipping occurs, your heater the gas. This provides a clean burning flame. Keep these holes clear
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SPECIFICATIONS SERVICE HINTS 16 TECHNICAL SERVICE SERVICE PUBLICATIONS SPECIFICATIONS CBN20/CBN20T CBN30T CBT20NT CBT30NT Btu (Variable) 10,000/20,000 15,000/30,000 10,000/20,000 15,000/30,000 Type Gas Natural Only Natural Only Natural Only Natural Only Ignition Piezo Piezo Electronic Electronic Pressure Regulator Setting 3" W.C. 3" W.C. 3" W.C. 3" W.C. Inlet Gas Pressure (in. of water) Maximum 10.5" 10.5" 10.5" 10.5" Minimum 4" 4" 4" 4" Dimensions, Inches (H x W x D) Heater (Includes knobs & g
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TROUBLESHOOTING 17 17 TROUBLESHOOTING Note: For additional help, visit DESA WARNING: Turn off and unplug CAUTION: Never use a wire, Heating Products’ technical service web heater and let cool before servic- needle, or similar object to clean site at www.desatech.com. ODS/pilot. This can damage ODS/ ing. Only a qualified service person Note: All troubleshooting items are listed in pilot unit. should service and repair heater. order of operation. OBSERVED PROBLEM POSSIBLE CAUSE REMEDY When ignito
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TROUBLESHOOTING 18 TROUBLESHOOTING Continued OBSERVED PROBLEM POSSIBLE CAUSE REMEDY Burner does not light after ODS/pilot is lit 1. Burner orifice is clogged 1. Clean burner (see Cleaning and Mainte- nance, page 15) or replace burner orifice 2. Inlet gas pressure is too low 2. Contact local natural or propane/LP gas company Delayed ignition of burner 1. Manifold pressure is too low 1. Contact local natural or propane/LP gas company 2. Burner orifice is clogged 2. Clean burner (see Cleaning and M
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TROUBLESHOOTING 19 19 TROUBLESHOOTING Continued WARNING: 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. IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning supplies, paint, paint remover, ci
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ILLUSTRATED PARTS BREAKDOWN Models CBN20 and CBP20 20 ILLUSTRATED PARTS BREAKDOWN 7 15 MODELS 1 22 CBN20 CBP20 21 4 20 9 18 17 12 13 11 10 9 14 19 8 5 16 6 3 2 For more information, visit www.desatech.com For more information, visit www.desatech.com 107882-01F
