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For more information, visit www.desatech.com

 

WARNING: If the information in this manual is not 

followed exactly, a fire or explosion may result causing 
property damage, personal injury or loss of life.

—  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 performed by a quali-

fied installer, service agency or the gas supplier.

INSTALLER: Leave this manual with the appliance.

CONSUMER: Retain this manual for future reference.

UNVENTED (VENT-FREE) GAS LOG HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

18" AND 24" VARIAbLE MANUAL CONTROL MODELS

HD18NA, HD18PA, HD24NA, AND HD24PA

Also Design-Certified 
As Vented Decorative 

Appliances

Summary of Contents for HD18NA

Page 1: ... switch do not use any phone in your building Immediatelycallyourgassupplierfromaneighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Installation and service must be performed by a quali fied installer service agency or the gas supplier INSTALLER Leave this manual with the appliance CONSUMER Retain this manual for future reference ...

Page 2: ...nvented gas fired heat er It uses air oxygen from the room in which it is installed Provisions for adequate combustion and ventilation air must be provided Refer to Air for Combustion and Ven tilation section on page 6 of this manual This appliance may be in stalled in an aftermarket permanently located manufactured mobile home where not prohib ited by local codes This appliance is only for use wi...

Page 3: ...nt even though no odor exists Make certain you read and understand all warnings Keep this manual for reference It is your guide to safe and proper operation of this fireplace WARNING Any change to this heater or its controls can be dangerous SAFETY Continued WARNING Do not use a blower insert heat exchanger insertorotheraccessorynotap proved for use with this heater WARNING Donotallowfans toblowdi...

Page 4: ...al operation slight smok ing could occur due to log curing and heater burning manufacturing residues 10 To prevent the creation of soot follow the instructions in Cleaning and Maintenance page 19 11 Before using furniture polish wax carpet cleaner or similar products turn heater off If heated thevaporsfromtheseproductsmay create a white powder residue within burner box or on adjacent walls or furn...

Page 5: ...tes contain important warranty and safety information 1 Remove logs and heater base assembly from carton Note Do not pick up heater base assem bly by burners This could damage heater Always handle base assembly by grate 2 Remove all protective packaging applied to logs and heater for shipment 3 Check heater for any shipping damage If heater is damaged call DESAHeating LLC at 1 866 672 6040 for rep...

Page 6: ...tight construction you must provide additional fresh air Unusually tight construction is defined as construction where a walls and ceilings exposed to the out side atmosphere have a continuous water vapor retarder with a rating of one perm 6x10 11 kg per pa sec m2 or less with openings gasketed or sealed and b weather stripping has been added on openable windows and doors and c caulking or sealant...

Page 7: ...han the maximum Btu Hr the space can support You must provide additional fresh air Your options are as follows A Rework worksheet adding the space of an adjoining room If the extra space provides an unconfined space remove door to adjoining 40 000 31 500 71 500 AIR FOR COMBUSTION AND VENTILATION Continued Figure 2 Ventilation Air from Inside Building Or Remove Door into Adjoining Room Option 3 Ven...

Page 8: ...lation for required size of ventilation grills or ducts IMPORTANT Do not provide openings for inlet or outlet air into attic if attic has a thermo stat controlled power vent Heated air entering the attic will activate the power vent AIR FOR COMBUSTION AND VENTILATION Continued NOTICE Stateorlocalcodesmay only allow operationofthisappli ance in a vented configuration Check your state or local codes...

Page 9: ...ARANCE TO COMBUSTIBLE MATERIALS Side Wall 16 Ceiling 42 Front 36 Carefully follow the instructions below This will ensure safe installation into a masonry UL127 listed manufactured fireplace or certi fied vent free firebox Minimum Clearances For Side Combustible Material Side Wall and Ceiling A Clearances from the side of the fireplace cabinet to any combustible material and wall should follow dia...

Page 10: ...lf and top of fireplace opening a hood is not required see Figure 6 Figure 6 Minimum Mantel Clearances Without Using Hood Minimum Noncombustible Material Clearances If Not Using Mantel Note If using a mantel proceed to If Using Mantel If not using a mantel follow the infor mation below You must have noncombustible material s above the fireplace opening Noncombustible materials such as slate marble...

Page 11: ...DAMPER CLAMP ACCESSORY FOR VENTED OPERATION Note When used as a vented heater ap pliance must be installed only in a solid fuel burning fireplace with a working flue and con structed of noncombustible material For Massachusetts Residents Only Instal lation of this gas log set as a vented appliance in the Commonwealth of Massachusetts re quires the damper be permanently removed or welded in the ful...

Page 12: ...not level heater will not work properly Installation Items Needed hardware package provided with heater approved flexible gas hose not provided if allowed by local codes sealant resistant to propane LP gas not provided electric drill with 3 16 drill bit flathead screwdriver 1 Apply pipe joint sealant lightly to male threads of fitting to be threaded into gas regulator Connect approved flexible gas...

Page 13: ...G For natural gas units never connect heater to private non utility gas wells This gas is commonly known as wellhead gas Installation Items Needed Before installing heater make sure you have the items listed below external regulator supplied by installer piping check local codes sealant resistant to propane LP gas equipment shutoff valve test gauge connection sediment trap tee joint pipe wrench A ...

Page 14: ...t Tee Cap Pipe Joint Nipple 3 Min Sediment Trap Gas Regulator CSA Design Certified Equipment Shutoff Valve With 1 8 NPT Tap Approved Flexible Gas Hose if allowed by local codes Natural From Gas Meter 5 W C to 10 5 W C Pressure Propane LP From External Regulator 11 W C to 14 W C Pressure We recommend that you install sediment trap in supply line as shown in Figure 13 Locate sediment trap where it i...

Page 15: ...aks Test Pressures Equal To or Less Than 1 2 PSIG 3 5 kPa 1 Close equipment shutoff valve see Fig ure 14 2 Pressurize supply piping system by either opening propane LP supply tank valve for propane LP gas or opening main gas valve located on or near gas meter for natural gas or using compressed air 3 Check all joints from gas meter natural gas or propane LP supply to equipment shutoff valve see Fi...

Page 16: ... of log must seat over pins on base as shown in Figure 17 2 Place middle log 2 onto base Holes in bottom of log must seat over pins on base as shown in Figure 17 Figure 17 Installing Rear and Middle Logs Figure 18 Installing Front Log Figure 19 Installing Left and Right Logs 3 Place front log 3 onto grate as shown in Figure 18 4 Place left top log 4 as shown in Figure 19 Match square peg on top of...

Page 17: ... to replace any part of the control system and any gas control which has been under water LIGHTING INSTRUCTIONS WARNING If fireplace has glass doors never operate this heater with glass doors closed If you op erateheaterwithdoorsclosed heat buildup inside fireplace willcauseglasstoburst Make suretherearenoobstructions across openings of fireplace You must operate this heater withafireplacescreenin...

Page 18: ...ttern Pilot Burner Thermocouple Pilot Burner Thermocouple Inspecting Burners Check pilot flame pattern and burner flame patterns often PILOT FLAME PATTERN Figure 21 shows a correct pilot flame pattern Figure 22 shows an incorrect pilot flame pat tern Incorrect pilot flame is not touching ther mocouple This will cause the thermocouple to cool When thermocouple cools heater will shut down If pilot f...

Page 19: ...e to excessive lint from carpeting bedding material pet hair etc WARNING Failure to keep the primary air opening s of theburner s cleanmayresultin sooting and property damage Once every year a qualified agency or certified chimney sweep should examine and clean the venting system of fireplace ODS PILOT AND BURNER Use a vacuum cleaner or small soft bristled brush to clean Burner Injector Holder and...

Page 20: ...ile in PILOT position 4 Air in gas lines when in stalled 5 Depleted gas supply pro pane LP only 6 ODS pilot is clogged 7 Gas regulator setting is not correct OBSERVED PROBLEM When control knob is pressed in and turned to pilot there is not spark at ODS pilot When control knob is pressed in and turned to pilot there is spark at ODS pilot but no ignition REMEDY 1 Reconnect ignitor cable 2 Free ignit...

Page 21: ... or propane LP gas company 1 Contact local natural or propane LP gas company 2 Clean burner see Cleaning and Maintenance page 19 or replace burner orifice 1 Clean burner see Cleaning and Maintenance page 19 or replace burner orifice 2 Replace damaged burner 3 Replace gas regulator POSSIBLE CAUSE 1 Control knob not fully pressed in 2 Control knob not pressed in long enough 3 Equipment shutoff valve...

Page 22: ... burner until air is removed from line Have gas line checked by local natural or propane LP gas company 3 Observe minimum instal lation clearances see page 9 4 Clean burner see Cleaning and Maintenance page 19 or replace burner orifice 1 Turn heater off when us ing furniture polish wax carpet cleaners or similar products 1 This is normal with most heaters If noise is exces sive contact qualified s...

Page 23: ...s see Checking Gas Con nections page 14 1 Open window and or door for ventilation 2 Contact local natural or propane LP gas company 3 Clean ODS pilot see Cleaning and Maintenance page 19 1 Locate and correct all leaks see Checking Gas Con nections page 14 2 Replace control valve 1 Take apart gas tubing and remove foreign matter 2 Locate and correct all leaks see Checking Gas Con nections page 14 T...

Page 24: ...www desatech com 123168 01C 24 Parts MODELS HD18NA HD18PA HD24NA And hd24pa 1 9 10 2 16 4 15 15 8 11 13 5 12 3 14 7 6 17e 17c 17a 17d 17b ...

Page 25: ...nlet Tube 1 9 122568 01 Screw 12 x 1 25 Hex Head 4 10 122569 01 Washer 4 11 099056 26 Injector 1 099056 19 Injector 1 12 099387 08 Pilot Tube 1 13 098249 01 ODS Nut 2 14 M11084 38 Screw HWH AB 8 18 x 0 38 2 15 M11084 26 Screw HWH AB 10 16 x 0 38 7 16 098354 01 Control Knob 1 17 123189 01 18 Log Set 1 123189 02 24 Log Set 1 17a 123190 01 Rear Log 1 123190 06 Rear Log 1 17b 123190 02 Middle Log 1 12...

Page 26: ...Heating LLC have ready model number of your heater the replacement part number Technical Service You may have further questions about instal lation operation or troubleshooting If so con tact DESA Heating LLC at 1 866 672 6040 When calling please have your model and serial numbers of your heater ready You can also visit DESA Heating LLC s web site at www desatech com Service Hints When Gas Pressur...

Page 27: ...8 KS MO AR 816 842 3911 www washerparts com East Coast Energy Products 10 East Route 36 W Long Branch NJ 07764 732 870 8809 1 800 755 8809 www njplaza com ecep 21st Century 2950 Fretz Valley Road Perkasie PA 18944 215 795 0400 800 325 4828 Laporte s Parts Service 2444 N 5th Street Hartsville SC 29550 843 332 0191 Parts Department Cans Unlimited Inc P O Box 645 Taylor SC 29687 0013 All States 803 8...

Page 28: ...pproved by DESA Heating LLC Warranty parts must be obtained through authorized dealers of this prod uct and or DESA Heating LLC who will provide original factory replacement parts Failure to use original factory replacement parts voids this warranty Travel handling transportation diagnostic material labor and incidental costs associated with warranty repairs unless expressly covered by this warran...

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