Desa CDR3924NT Owner'S Operation And Installation Manual Download

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WARNING: If the information in this manual is not fol-
lowed 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.

UNVENTED (VENT-FREE) GAS LOG HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

24" THERMOSTAT MODELS CDR3924NT AND CDR3924PT

Summary of Contents for CDR3924NT

Page 1: ...ny 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 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...

Page 2: ...d gas ﬁred heater It uses air oxygen from the room in which it is installed Provi sions for adequate combustion and ventilation air must be provided Refer to Air for Combustion and Ventilation section on page 5 of this manual This appliance may be installed in an aftermarket per manently located manufactured mobile home where not prohibited by local codes This appliance is only for use with the ty...

Page 3: ...rtain you read and understand all warn ings Keep this manual for reference It is your guide to safe and proper operation of this heater WARNING Any change to this heater or its controls can be dangerous WARNING Do not use a blower insert heat exchanger insert orotheraccessorynotap proved for use with this heater WARNING This appliance is for installation only in a solid fuel burning ﬁreplace or ap...

Page 4: ...has an Oxygen Deple tion Sensing ODS safety shutoff system The ODS shuts down the heater if enough fresh air is not available See Air for Combustion and Ventilation page 5 If heater keeps shutting off see Troubleshooting page 20 SAFETY INFORMATION Continued 11 Do not run heater where ﬂammable liquids or vapors are used or stored under dusty conditions 12 Do not use this heater to cook food or burn...

Page 5: ...s an electronic ignitor to light heater fuel supply AIR FOR COMBUSTION AND VENTILATION WARNING This heater shall not be installed in a conﬁned spaceorunusuallytightconstruc tionunlessprovisionsareprovid ed for adequate combustion and ventilationair Readthefollowing instructionstoinsureproperfresh air for this and other fuel burning appliances in your home Todayʼs homes are built more energy efﬁcie...

Page 6: ...W FOR HEATER LOCATION Determining if You Have a Conﬁned or Unconﬁned Space Use this work sheet to determine if you have a conﬁned or unconﬁned space Space Includes the room in which you will install heater plus any adjoining rooms with doorless pas sageways or ventilation grills between the rooms 1 Determine the volume of the space length x width x height Length x Width x Height __________cu ft vo...

Page 7: ... 12 of the ﬂoor on the wall connecting the two spaces see options 1 and 2 Figure 2 You can also remove door into adjoining room see option 3 Figure 2 Follow the National Fuel Gas Code ANSI Z223 1 NFPA 54 Section 5 3 Air for Combustion and Ventilation for required size of ventilation grills or ducts AIR FOR COMBUSTION AND VENTILATION Continued Ventilation Air From Outdoors Provide extra fresh air b...

Page 8: ...efore operating heater WARNING Seal any fresh air vents or ash clean out doors located on ﬂoor or wall of ﬁre place If not drafting may cause pilot outage or sooting Use a heat resistant sealant Do not seal chimney ﬂue damper WARNING Never install the heater in a bedroom or bathroom in a recreational vehicle where curtains furniture clothing or other ﬂammable objectsarelessthan42inches from the fr...

Page 9: ...rances If Not Using Mantel Note If using a mantel proceed to If Using Mantel If not using a mantel follow the information on this page You must have noncombustible material s above the ﬁreplace opening Noncombustible materials such as slate marble tile etc must be at least 1 2 inch thick With sheet metal you must have noncombustible material behind it Noncombustible material must extend at least 8...

Page 10: ...ox may become hot to the touch If installed properly these temperatures meet the requirement of the national product standard Follow all minimum clearances shown in this manual NOTICE Ifyourinstallationdoes not meet the minimum clear ances shown you must do one of the following operate the logs only with the ﬂue damper open raise the mantel to an accept able height remove the mantel FLOOR CLEARANC...

Page 11: ...ided if allowed by local codes sealant resistant to propane LP gas not pro vided electric drill with 3 16 drill bit metal or ma sonry as applicable ﬂathead screwdriver 1 Connect ﬁtting to base as shown in Figure 10 Connect approved ﬂexible gas hose to ﬁtting in base see Figure 10 IMPORTANT Hold gas ﬁtting with wrench when connecting ﬂexible gas hose Figure 10 Attaching Flexible Gas Hose to Heater ...

Page 12: ...you do not reduce incoming gas pres sure heater regulator damage could occur Install external regulator with the vent pointing down as shown in Figure 12 Pointing the vent down protects it from freezing rain or sleet WARNING For natural gas never connect heater to private non utility gas wells This gas is commonly known as wellhead gas CAUTION Use only new black iron or steel pipe Inter nally tinn...

Page 13: ...ustment CHECKING GAS CONNECTIONS WARNING Test all gas pip ing and connections internal and external to unit for leaks afterinstallingorservicing Cor rect all leaks at once WARNING Never use an open ﬂame to check for a leak Applyanoncorrosiveleakdetec tion ﬂuid to all joints Bubbles forming show a leak Correct all leaks at once CAUTION Make sure exter nal regulator has been installed between propan...

Page 14: ...all leaks at once Figure 14 Equipment Shutoff Valve Figure 15 Checking Gas Joints Propane LP Gas Only Thermostat Gas Valve or Control Valve Location Propane LP Supply Tank Equipment Shutoff Valve Open Closed Equipment Shutoff Valve Figure 16 Checking Gas Joints Natural Gas Only Thermostat Gas Valve or Control Valve Location Gas Meter Equipment Shutoff Valve INSTALLING LOGS WARNING Failure to posi ...

Page 15: ...t screws to the front of base see Figure 18 3 Place left side log 3 onto two log alignment screws on left side of base see Figure 18 4 Place right side log 4 onto two log alignment screws on right side of base see Figure 18 5 Place rear log 5 onto two alignment screws to the rear of base see Figures 17 and 19 6 Place crossover log 6 onto log alignment pin on middle log 1 and rear log 5 see Figure ...

Page 16: ...he control system and any gas control which has been under water LIGHTING INSTRUCTIONS WARNING If ﬁreplace has glass doors never operate this heater with glassdoorsclosed Ifyouoper ate heater with doors closed heat buildup inside ﬁreplace will cause glass to burst Also ifﬁreplaceopeninghasventsat the bottom you must open the vents before operating heater You must operate this heater with a firepla...

Page 17: ...ore lighting pilot again 8 Turn control knob counterclockwise to desired heating level The front burner should light Set control knob to any heat level between HI and LO 9 To light the rear yellow ﬂame burner push in and turn rear burner control knob coun terclockwise to the ON position CAUTION Do not try to ad just heating levels by using the equipment shutoff valve TO TURN OFF GAS TO APPLIANCE S...

Page 18: ...wn Yellow Tipping At Top of Blue Flame Natural Gas Propane LP Gas Propane LP Gas Natural Gas Pilot Burner Thermocouple BURNER FLAME PATTERNS Figure 26 shows correct burner ﬂame patterns Figure 27 shows incorrect burner ﬂame patterns The incorrect burner ﬂame patterns show yellow tipping at top of blue ﬂame WARNING If yellow tipping occurs your heater could pro duce increased levels of carbon monox...

Page 19: ...hut off the unit including the pilot Allow the unit to cool for at least thirty minutes 2 Inspect burners pilot and primary air inlet holes on injector holder for dust and dirt see Figures 28 or 29 3 Blow air through the ports slots and holes in the burners 4 Check the injector holders located at the end of the burner tubes again Remove any large Figure 28 Injector Holder On Outlet Burner Tube Rea...

Page 20: ... 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 REMEDY 1 Reconnect ignitor cable 2 Free ignitor cable if pinched by any metal or tubing Keep ignitor cable dry 3 Replace ignitor cable 4 Replace ignitor 5 Replace pilot assembly 6 Replace pilot assembly 7 Install new alkaline battery in electronic ignitor Verify ba...

Page 21: ...afety interlock system to reset Repeat ignition operation 4 Fully open equipment shutoff valve 5 A Contact local natural or propane LP gas company B Clean ODS pilot see Cleaning and Maintenance page 19 or replace ODS pilot assembly 6 Hand tighten until snug then tighten 1 4 turn more 7 Replace pilot assembly 8 Replace control valve 1 Contact local natural or pro pane LP gas company 2 Clean burner ...

Page 22: ...p for a minute 2 Operate burners until air is removed from line Have gas line checked by local natural or propane LP gas company 3 Observe minimum installa tion clearances see pages 8 through 10 4 Clean burners see Cleaning and Maintenance page 19 1 Turn heater off when using furniture polish wax carpet cleaners or similar products 1 Refer to Air for Combustion and Ventilation requirements page 5 ...

Page 23: ...gged 1 Gas leak See Warning statement at top of page 2 Control valve defective 1 Foreign matter between con trol valve and burner 2 Gas leak See See Warn ing statement at top of page 1 Thermostat sensing bulb needs to be repositioned REMEDY 1 Open window to ventilate room Stop using odor caus ing products while heater is running 2 Reﬁll supply tank propane LP only 3 Locate and correct all leaks se...

Page 24: ...on If your ﬁreplace has glass doors position sensing bulb directly behind door gap on right bottom side see Figure 35 4 The mounting clip must be a minimum of 3 from bottom of ﬁreplace to prevent crimping of capillary Once you have decided on a location clean the area thoroughly Remove the paper backing from the adhesive on back of mounting clip Press the clip into the new location so that the the...

Page 25: ...VICE HINTS When 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 low You may feel your gas pressure is too low If so contact your local natural or propane LP gas supplier ACCESSORIES NOTICE All accessories may not be available for all ﬁreplace models Purchase these heater accessories from your loca...

Page 26: ...www desatech com 113183 01B 26 ILLUSTRATED PARTS BREAKDOWN MODELS CDR3924PT AND CDR3924NT 4 7 6 27 27 8 26 10 23 19 20 29 28 32 31 33 30 14 15 9 13 5 25 21 1 16 17 2 12 24 3 11 22 18 ...

Page 27: ...56 19 Burner Oriﬁce Injector Rear 1 17 101004 12 101004 09 Burner Oriﬁce Injector Front 1 18 108111 01 108111 01 Cast Iron Grate 1 19 108692 06 108692 06 T Stat Cover Plate 1 20 108692 05 108692 05 Ignitor Plate 1 21 099123 01 099123 01 Thermobulb Clip 2 22 ___ 098867 18 Gas Regulator Propane LP 1 098867 17 ___ Gas Regulator Natural 1 23 098522 25 098522 10 Thermostatic Gas Valve Kit 1 24 108106 0...

Page 28: ... voids this warranty The heater MUST be installed by a qualiﬁed installer in accordance with all local codes and instructions furnished with the unit This warranty does not apply to parts that are not in original condition because of normal wear and tear or parts that fail or become damaged as a result of misuse accidents lack of proper maintenance or defects caused by improper installation Travel...

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