Desa VF-24N-MHD User Manual Page 1

For more information, visit www.desatech.comWARNING: If the information in this manual is not fol-

www.desatech.com116986-01B10Figure 6 - Minimum Mantel Clearances Without Using HoodMinimumNoncombustible Material MinimumNoncombustible Material Heigh

www.desatech.com116986-01B 11MANTEL CLEARANCESIn addition to meeting noncombustible material clearances, you must also meet required clearances be

www.desatech.com116986-01B12          

www.desatech.com116986-01B 13We recommend that you install a sediment trap in supply line as shown in Figure 12. Locate sediment trap where it is with

www.desatech.com116986-01B14INSTALLATIONContinued4. Check all joints from equipment shutoff valve to control valve (see Figure 14 or 15). Apply nonco

www.desatech.com116986-01B 15OPERATING HEATERFOR YOUR SAFETY  WARNING: If you do not fol-low these instructions exactly,  

www.desatech.com116986-01B166. Press the buttons and at the same time. A short acoustic signal conrms the start sequence has begun. Further sh

www.desatech.com116986-01B 17OPERATING HEATERContinued• Timer: The timer mode (TIMER) operates much like the temperature mode above. The timer se

www.desatech.com116986-01B181. Disconnect ignitor cable from receiver and connect to Piezo Ignitor Tab (see Figure 18, pag

www.desatech.com116986-01B 19Figure 22 shows correct burner ame pattern. 

www.desatech.com116986-01B2    --

www.desatech.com116986-01B201. Remove two screws from back of unit that attach main log assembly to base assembly (see Figure 24). 2 .

www.desatech.com116986-01B 21TROUBLESHOOTING

www.desatech.com116986-01B22TROUBLESHOOTINGContinued Burner backring during com-bustionOrange ame in burner during burner com

www.desatech.com116986-01B 23TROUBLESHOOTINGContinued    

www.desatech.com116986-01B24WIRING DIAGRAMSPARKSPARKPilot4 AA BatteriesON/OFFSwitchThermocurrentInterrupter BlockSWSWTCTCBattery CompartmentMAGRMOSWPA

www.desatech.com116986-01B 25For all models. Equipment shutoff valve with 1/8" NPT tap. Fits 1/2" NPT pipe. SE

www.desatech.com116986-01B26ILLUSTRATED PARTS BREAKDOWN123452522781896101126342312212029282928

www.desatech.com116986-01B 27PARTS LISTThis list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed u

2701 Industrial DriveP.O. Box 90004Bowling Green, KY 42102-9004www.desatech.comNOT A UPCWARRANTY INFORMATIONKEEP THIS WARRANTYModel Serial No. Date Pu

www.desatech.com116986-01B 3 WARNING: Do not allow fans 

www.desatech.com116986-01B41. This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible fo

www.desatech.com116986-01B 5LOCAL CODESInstall and use heater with care. Follow all local codes. In the absence of local codes, use the lat-est editio

www.desatech.com116986-01B6construction where: -  

www.desatech.com116986-01B 7AIR FOR COMBUSTION AND VENTILATIONContinuedIf the actual Btu/Hr used is less than the maximum Btu/Hr the space can suppo

www.desatech.com116986-01B8INSTALLATIONNOTICE: This heater is intended     

www.desatech.com116986-01B 9INSTALLATION AND CLEARANCES  WARNING: Maintain the 