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DYNAVENT
WINDOW WALL FURNACE
DIRECT-VENT NATURAL GAS HEATER
OWNER'S OPERATION AND INSTALLATION MANUAL
DNV25NB
DNV40NB
25,000 and 40,000 BTU/Hr "B" Model Furnaces
WARNING: If the information in these instructions is not
followed exactly, a fire or explosion may result causing
property damage, personal 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.
FOR YOUR SAFETY
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.
This appliance may be installed in an aftermarket*, permanently located, manufac-
tured (mobile) home, where not prohibited by local codes.
This appliance is only for use with the type of gas indicated on the rating plate. This
appliance is not convertible for use with other gases.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
Save this manual for future reference.
WARNING: Improper in-
stallation, adjustment,
alteration, service, or
maintenance can cause
injury or property dam-
age. Refer to this manual
for correct installation
and operational proce-
dures. For assistance or
additional information
consult a qualified in-
staller, service agency,
or the gas supplier.
— Installation and ser-
vice must be performed
by a qualified installer,
service agency, or the
gas supplier.
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Table of Contents
Related Manuals for Desa DynaVent DNV25NB
Summary of Contents for Desa DynaVent DNV25NB
- Page 1 DYNAVENT WINDOW WALL FURNACE DIRECT-VENT NATURAL GAS HEATER OWNER’S OPERATION AND INSTALLATION MANUAL DNV25NB DNV40NB 25,000 and 40,000 BTU/Hr “B” Model Furnaces WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or loss of life.
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Page 2: Safety Information
DYNAVENT DIRECT-VENT NATURAL GAS HEATER SAFETY INFORMATION WARNINGS IMPORTANT: Read this owner’s manual carefully and completely before trying to assemble, operate, or service this furnace. Improper use of this furnace can cause seri- ous injury or death from burns, fire, explosion, electrical shock, and carbon monoxide poisoning. -
Page 3: Local Codes
This results in the greatest heating comfort. This can also result in lower gas bills. LIMIT SWITCH The limit switch shuts off the gas to the main burner if the furnace becomes too hot to operate safely. DNV25NB DNV40NB 25,000 40,000 18,750 Btu/Hr 30,000 Btu/Hr... -
Page 4: Check Gas Type
DYNAVENT DIRECT-VENT NATURAL GAS HEATER INSTALLATION Mounting hardware needed to mount fur- nace into wall is included with the furnace. No venting material is needed. You must furnish tools and all gas piping from the gas source to the furnace inlet. WARNING: A qualified ser- vice person must install furnace. - Page 5 INSTALLATION (Continued) CREATING WALL OPENING AND MOUNTING FURNACE Remove furnace front cover. Remove the two screws at the lower edges of front cover. Lift front cover away. Installing in Normal Frame Wall The 25,000 BTU/Hr model is designed to fit between two wall studs set at 16 inch on center.
- Page 6 DYNAVENT DIRECT-VENT NATURAL GAS HEATER INSTALLATION (Continued) 6. Attach thermostat to thermostat mount- ing plate with screws provided (see Fig- ure 4). IMPORTANT: Note mounting plate position in Figure 4. Correctly position mounting plate for your model furnace. 7. Insert thermostat mounting plate be- tween wall and cabinet flange.
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Page 7: Connecting To Gas Supply
INSTALLATION (Continued) 10. Feed thermostat wires from attic to furnace through 1/2" hole in ceiling wall plate. 11. Connect thermostat wires from attic to thermostat wires on furnace. Connect red wires together, then connect white wires together. Use wire nuts to make connections. - Page 8 DYNAVENT DIRECT-VENT NATURAL GAS HEATER INSTALLATION (Continued) Connecting Furnace to Gas Supply at Rear of Furnace 1. Remove the two screws in back of fur- nace cabinet located by the exhaust vent(s) (see Figures 9 and 10). 2. Remove two screws on front lower flange that attach furnace flange to fur- nace cabinet flange (see Figure 11).
- Page 9 INSTALLATION (Continued) Providing Gas Piping to Furnace You must provide gas piping from gas source to furnace. The gas piping must be in a vertical position where it connects to the furnace. This prevents interference with front cover installation. Consult your local gas company for proper routing of the gas lines. Pipe size is determined by the length of pipe from the gas source to the furnace and the total BTU load on the gas source.
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Page 10: Checking Gas Connections
DYNAVENT DIRECT-VENT NATURAL GAS HEATER INSTALLATION (Continued) Installation must include an equipment shutoff valve (supplied), 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 furnace (see Figure 15). - Page 11 INSTALLATION (Continued) Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa) 1. Close equipment shutoff valve (see Fig- ure 16). Pressurize supply piping system by either using compressed air or opening main gas valve located on or near gas meter. Check all joints from gas meter to equipment shutoff valve.
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Page 12: Operating Furnace
DYNAVENT DIRECT-VENT NATURAL GAS HEATER OPERATING FURNACE WARNING: Furnace burner, combustion chamber, and ex- haust port are very hot during operation. Keep children and adults away from hot surfaces to avoid burns and clothing igni- tion. Carefully supervise young children when they are in the same room as furnace. -
Page 13: Inspecting Burner Flame
OPERATING FURNACE (Continued) TO TURN OFF GAS TO FURNACE 1. Set thermostat to lowest setting 2. Turn equipment gas valve clockwise to OFF position. Do not force equipment gas valve. 3. Unplug furnace if service is to be per- formed. To Shut Down Furnace for an Extended Period of Time 1. -
Page 14: Cleaning And Maintenance
DYNAVENT DIRECT-VENT NATURAL GAS HEATER CLEANING AND MAINTENANCE WARNING: Turn off and un- plug furnace and let cool before cleaning. Turn equipment shutoff valve to OFF position. Only a qualified service person should service and repair furnace. WARNING: Keep furnace clear and free from combustible mate- rials, gasoline, and other flam- mable vapors and liquids. -
Page 15: Troubleshooting
TROUBLESHOOTING Note: For additional help, visit DESA International’s technical service web site at www.desatech.com. Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM No heat 201835 WARNING: Turn off and unplug furnace and let cool before servic- ing. - Page 16 DYNAVENT DIRECT-VENT NATURAL GAS HEATER TROUBLESHOOTING Continued OBSERVED PROBLEM No heat (continued) IGNITION FAILURES WARNINGS: • Never connect unit or ignition circuit to 230 volts. • Never operate unit with glo bar touching burner or any other ground. Damage to ignition control will occur.
- Page 17 TROUBLESHOOTING Continued OBSERVED PROBLEM Ignition failures 201835 POSSIBLE CAUSE 1. Glo bar will not glow - with blower run- ning and microswitch engaged 2. Glo bar glows but burner will not come on 3. Glo bar operating and gas valve open- ing but burner will not light 4.
- Page 18 DYNAVENT DIRECT-VENT NATURAL GAS HEATER TROUBLESHOOTING Continued OBSERVED PROBLEM Ignition failures Excessive noise Main burner will not cycle off Furnace will not operate ® POSSIBLE CAUSE 5. Burner cycles off and glo bar comes on immediately, check the following: 1. Blower out of balance 2.
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Page 19: Wiring Diagrams
Contact authorized dealers of this product. If they can’t supply original replacement part(s), either contact your nearest Parts Ignition Control Central (see below) or call DESA Board International’s Parts Department at 1-800- 972-7879. When calling DESA Interna- tional, have ready: (Open) •... -
Page 20: Service Hints
SERVICE You may have further questions about in- stallation, operation, or troubleshooting. If so, contact DESA International’s Technical Service Department at 1-800-323-5190. You can also visit DESA International’s technical service site www.desatech.com. These Parts Centrals are privately owned businesses. They have agreed to support our customer’s needs by providing original replacement parts and accessories. -
Page 21: Illustrated Parts List
ILLUSTRATED PARTS LIST CABINET ASSEMBLY 25,000 BTU/HR MODEL PART NUMBER 030643 121520 191240 160912 100892 070509 121224 062242 070542 070508 191244 191246 531010 191262 Parts available, not shown. * You must order nameplate and operating instructions decal separately. ** Standard hardware, can be picked up at local hardware store. 201835 OWNER’S MANUAL This list contains replaceable parts used in your furnace. - Page 22 DYNAVENT DIRECT-VENT NATURAL GAS HEATER ILLUSTRATED PARTS LIST CABINET ASSEMBLY 40,000 BTU/HR MODEL Parts available, not shown. * You must order nameplate and operating instructions decal separately. ** Standard hardware, available at local hardware store. ® This list contains replaceable parts used in your furnace. When ordering parts, follow the instructions listed under Replacement Parts on page 19 of this manual.
- Page 23 ILLUSTRATED PARTS LIST COMBUSTION CHAMBER ASSEMBLY 25,000 BTU/HR MODEL PART NUMBER DESCRIPTION 121357 Screw, #6 x 5/8" ** 231955 Wire Harness and Ignition Control 062461 Ignition Control Mounting Bracket 121372 Screw, #6 x 1/2" ** 230625 Time Delay Relay 230218 Bushing 120158 Screw, #8 x 3/8"...
- Page 24 DYNAVENT DIRECT-VENT NATURAL GAS HEATER ILLUSTRATED PARTS LIST COMBUSTION CHAMBER ASSEMBLY 40,000 BTU/HR MODEL 23 25 PART NUMBER DESCRIPTION 121502 Screw, #6 x 3/8" ** 231950 Flame Sensing Probe 063018 Glo-Bar Retainer 120158 Screw, #8 x 3/8" ** 030891 Burner Access Door 121388 Screw, #10 x 1/2"...
- Page 25 ILLUSTRATED PARTS LIST BURNER ASSEMBLY 25,000 BTU/HR MODEL ** Standard hardware, available at your local hardware store. 201835 This list contains replaceable parts used in your furnace. When ordering parts, follow the instructions listed under Replacement Parts on page 19 of this manual. PART NUMBER DESCRIPTION...
- Page 26 DYNAVENT DIRECT-VENT NATURAL GAS HEATER ILLUSTRATED PARTS LIST BURNER ASSEMBLY 40,000 BTU/HR MODEL PART NUMBER 120717 010621 010623 070591 171167 180189 121388 160968 170012 171170 121388 062694 170082 ** Standard hardware, available at your local hardware store. ® This list contains replaceable parts used in your furnace. When ordering parts, follow the instructions listed under Replacement Parts on page 19 of this manual.
- Page 27 ILLUSTRATED PARTS LIST BLOWER ASSEMBLY 25,000 BTU/HR MODEL PART NUMBER DESCRIPTION 350086 Room Air Wheel 121252 Screw, #10 x 3/8" ** 121247 Screw, #2-56 x 5/8" ** 230510 Microswitch Assembly 070537 Intake Tube Gasket 121661 Tinnerman Nut 390260 Blower Housing (room air) 121421 Hex Lock Nut, #10-24 ** 050751...
- Page 28 DYNAVENT DIRECT-VENT NATURAL GAS HEATER ILLUSTRATED PARTS LIST BLOWER ASSEMBLY 40,000 BTU/HR MODEL PART NUMBER DESCRIPTION 070570 Combustion Air Cover Gasket 121252 Screw, #10 x 3/8" ** 350088 Room Air Wheel (CW Rotation) 390328 Room Air Blower Housing (left side) 120717 Hex Nut, #10-24 (keps) ** 121661...
- Page 29 OWNER’S MANUAL NOTES _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 201835...
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Page 30: Warranty Information
DYNAVENT GAS WALL FURNACE DESA International warrants this product to be free from defects in materials and components for one (1) year and five (5) years on the combustion chamber/heat exchanger assembly from the date of first purchase, provided that the product has been properly installed, operated and maintained in accordance with all applicable instructions.