www.desatech.com124452-01A 25SPECIFICATIONSTECHNICAL SERVICEYou may have further questions about installa-tion, operation or troubleshooting. If so, contactDESA Heating, LLC at 1-866-672-6040. Whencalling please have your model and serialnumbers of your heater ready.You can also visit DESA Heating, LLC’s website at www.desatech.com.Models VYS18PC• Rating (Variable): 16,000/23,000 Btu/Hr• Gas Type: Propane/LP• Ignition: Piezo• Manifold Pressure: 8.0" W.C.• Inlet Gas Pressure (in. of water):Maximum 14" W.C., Minimum 11"* W.C.• Shipping Weight: 27 lbs.Models VYS18NC• Rating (Variable): 17,000/24,000 Btu/Hr• Gas Type: Natural• Ignition: Piezo• Manifold Pressure: 3.0" W.C.• Inlet Gas Pressure (in. of water):Maximum 10.5" W.C., Minimum 5"* W.C.• Shipping Weight: 27 lbs.*For the purpose of input adjustment.Models VYS24PC• Rating (Variable): 16,000/26,000 Btu/Hr• Gas Type: Propane/LP• Ignition: Piezo• Manifold Pressure: 8.0" W.C.• Inlet Gas Pressure (in. of water):Maximum 14" W.C., Minimum 11"* W.C.• Shipping Weight: 27 lbs.Models VYS24NC• Rating (Variable): 17,000/26,000 Btu/Hr• Gas Type: Natural• Ignition: Piezo• Manifold Pressure: 3.0" W.C.• Inlet Gas Pressure (in. of water):Maximum 10.5" W.C., Minimum 5"* W.C.• Shipping Weight: 27 lbs.*For the purpose of input adjustment.SERVICE HINTSWhen Gas Pressure Is Too Low• pilot will not stay lit• burners will have delayed ignition• heater will not produce specified heat• propane/LP gas supply may be lowYou may feel your gas pressure is too low. Ifso, contact your local natural or propane/LPgas supplier.REPLACEMENT PARTSNote: Use only original replacement parts.This will protect your warranty coverage forparts replaced under warranty.PARTS UNDER WARRANTYContact authorized dealers of this product. Ifthey can’t supply original replacement part(s),call DESA Heating, LLC at 1-866-672-6040.When calling DESA Heating, LLC, haveready:• your name• your address• model and serial numbers of your heater• how heater was malfunctioning• type of gas used (propane/LP or naturalgas)• purchase dateUsually, we will ask you to return the part tothe factory.PARTS NOT UNDER WARRANTYContact authorized dealers of this product.If they can’t supply original replacementpart(s), contact your nearest Parts Central(see page 28) or call DESA Heating, LLC at1-866-672-6040 for referral information. A listof authorized dealers can be found by visitingwww.deaint.com.When calling DESA Heating, LLC, haveready• model number of your heater• the replacement part number