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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

Also Design-Certified as Vented Decorative Appliance

18" AND 24" VARIAbLE MANUALLy-CONTROLLED 

MODELS H18Nb, H18Pb, H24Nb AND H24Pb

PFS

®

US

Summary of Contents for H18NB

Page 1: ...tch 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 UNVE...

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 5 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: ... 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 WARNING Do not use a blower insert heat exchanger insertorotheraccessorynotap proved for use with this heater SAFETY Continued WARNING Donotallowfans toblowdirectlyintothefireplace Avoidanydraftsthatalterburner flame patterns Ce...

Page 4: ... less than 100 lbs capacity is not recommended propane LP units only 4 If you smell gas shut off gas supply 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 5 This heater shall not ...

Page 5: ... heaters Non thermostat models may also be operated as a vented decorative ANSI Z21 60 product by opening flue damper Safety Pilot This heater has a pilot with an Oxygen Deple tion Sensing ODS safety shutoff system The ODS pilot is a required feature for vent free room heaters The ODS pilot shuts off the heater if there is not enough fresh air WARNING This heater shall notbeinstalledinaroomorspace...

Page 6: ... whose volume is less than 50 cubic feet per AIR FOR COMBUSTION AND VENTILATION Continued 1 000 Btu per hour 4 8 m3 per kw of the ag gregate input rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 cubic feet per 1 000 Btu per hour 4 8 m3 per kw of the aggregate input rating of all appliances installed in that space Rooms communicat...

Page 7: ...GasCode or applicable local codes VENTILATION AIR Ventilation Air From Inside Building This fresh air would come from an adjoining unconfined space When ventilating to an adjoining unconfined space you must provide two permanent openings one within 12 of the 40 000 31 500 71 500 AIR FOR COMBUSTION AND VENTILATION Continued Figure 2 Ventilation Air from Inside Building Or Remove Door into Adjoining...

Page 8: ...eat resistant sealant Do not seal chimney flue damper Installation WARNING Never install the heater in a bedroom or bathroom un less installed as a vented appli ance see page 11 in a recreational vehicle where curtains furniture cloth ing or other flammable objects are less than 36 from front and 42 from top of heater for side clearances see Figure 4 page 9 in high traffic areas in windy or drafty...

Page 9: ...the ceiling should not be less than 42 Figure 4 Minimum Clearance for Combustible to Wall Minimum 16 from Side Wall Example INSTALLATION Continued NOTICE Manual control heaters may be used as a vented product If so you must always run heater with chimney flue damper open If running heater with damper open noncombustiblematerialabovefire place opening is not needed Go to InstallingDamperClampAccess...

Page 10: ...ances you must operate heater with chimney flue damper open Go to Install ing Damper Clamp Accessory for Vented Operation page 11 INSTALLATION Continued Mantel Clearances In addition to meeting noncombustible mate rial clearances you must also meet required clearances between fireplace opening and mantel shelf If you do not meet the clearances listed below you will need a hood You must meet the mi...

Page 11: ...vented heater ap pliance must be installed only in a solid fuel burning fireplace with a working flue and constructed of noncombustible material You may use this heater as a vented product There are three reasons for operating your heater in the vented mode 1 The fireplace does not meet the clear ance to combustibles requirements for vent free operation 2 State or local codes do not permit vent fr...

Page 12: ...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 the fitting to be threaded into gas regulator Connect approved flexible gas hose to gas regulator of heater see Figure 10 IMPORTANT Hold gas regulator with wrench when connecting flexible gas hose 2 Locate masonry screws in hardware package ...

Page 13: ...l regulator will reduce incoming gas pressure You must reduce incoming gas pressure to between 11 and 14 of water If you do not reduce incoming gas pressure heater regulator damage could occur Install external regulator with vent point ing down as shown in Figure 12 Pointing vent down protects it from freezing rain or sleet CAUTION Useonlynew black ironorsteelpipe Internally tinned copper tubing m...

Page 14: ... regulator 2 Cap off open end of gas pipe where equip ment shutoff valve was connected 3 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 4 Check all joints of gas supply piping system Apply a commercial leak detection solution to all joints Bubbles formin...

Page 15: ...dingto the log installation instructions in this manual Flames contact ing log will create soot It is very important to install these logs exactly as instructed Do not modify logs Only use logs supplied with heater 1 Place grate into square holes on heater base as shown in Figure 17 2 Place front log on burner so that it sits between grate fingers and burner see Figure 17 Figure 17 Installing Grat...

Page 16: ...n in Figure 19 The bottom of the log is marked with a C for center Match square peg on center of rear log with square hole in bottom of center crossover Match round peg on center of front log with round hole in bottom of center crossover log 6 Place the right crossover log as shown in Figure 20 The bottom of the log is marked with a R for right Match square peg on right side of rear log with squar...

Page 17: ...UR SAFETY READ BEFORE LIGHTING WARNING If you do not fol low these instructions exactly a fire or explosion may result causing property damage per sonal injury or loss of life A This appliance has a pilot which must be lighted by hand When lighting the pilot follow these instructions exactly B BEFORE LIGHTING smell all around the appliance area for gas Be sure to smell next to the floor because so...

Page 18: ...r 30 sec onds after lighting pilot After 30 seconds release control knob Note If pilot goes out repeat steps 3 through 7 If control knob does not pop out when released contact a qualified service person or gas supplier for repairs 8 Slightly press and turn control knob coun terclockwise to desired heating level The burner should light Set control knob to HI or LO Figure 21 Control Knob and Ignitor...

Page 19: ...down If pilot flame pattern is incorrect as shown in Figure 24 turn heater off see To Turn Off Gas to Ap pliance page 18 see Troubleshooting page 21 Note The pilot flame on natural gas units will have a slight curve but flame should be blue and have no yellow or orange color Pilot Burner Thermocouple Pilot Burner Thermocouple Cleaning and Maintenance WARNING Turn off heater and let cool before cle...

Page 20: ...holder located at the end of the burner tube again Remove any large particles of dust dirt lint or pet hair with a soft cloth or vacuum cleaner nozzle Figure 25 Injector Holder On Outlet Burner Tube Burner Tube Primary Air Inlet Holes Injector Holder May Be Brass or Aluminum Depending on Model Figure 26 Pilot Inlet Air Hole CLEANING AND MAINTENANCE Continued Pilot Assembly Pilot Air Inlet Hole 5 B...

Page 21: ...r 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 ignitor cable if pinched by any...

Page 22: ... 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 23: ... 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 8 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 24: ... 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 TR...

Page 25: ...ximum 10 5 W C Minimum 5 W C Shipping Weight 27 lbs For the purpose of input adjustment Service 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 Replacement Parts Note Use only orig...

Page 26: ...www desatech com 124465 01A 26 Parts Variable Manually Controlled H18NB H18PB H24NB AND H24PB 15 17 3 17 4 18 Models 17 4 24 Models 3 14 16 11 10 4 2 12 8 5 14 13 7 9 1 15 15 17 5 17 2 17 1 ...

Page 27: ...Injector 1 107186 06 Injector 1 107186 07 Injector 1 107186 08 Injector 1 12 098354 01 Control Knob 1 13 099387 08 Pilot Tube 1 14 M11084 38 HWH AB 8 18 x 0 38 Screw 1 15 M11084 26 HWH AB 10 16 x 0 38 Screw 8 16 098303 01 HWH AB 6 20 x 0 25 Screw 2 17 124453 03 18 Log Set 1 124453 04 24 Log Set 1 17 1 124520 01 Front Log 1 124521 01 Front Log 1 17 2 124520 02 Rear Log 1 124521 02 Rear Log 1 17 3 1...

Page 28: ...0 446 1446 Fax 616 791 8270 www nbmc com Washer Equipment Co 1715 Main Street Kansas City MO 64108 2195 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 4034 215 795 0400 800 325 4828 Laporte s Parts Service 2444 N 5th Street Hartsville ...

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Page 32: ...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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