Desa GWN20TA manual

MODELS GWN20T A, GWP20T A, GWN30T A, GWP30T A, WMN20A, WMP20A UNVENTED (VENT -FREE) BL UE FLAME GAS HEA TER SAFETY INFORMA TION AND INST ALLA TION MANU AL For more information, visit www .desatech.com W ARNING: If the information in this manual is not fol- lowed exactly , a re or explosion may result causing property damage, personal injury or l[...]

www .desatech.com 1 19344-01B 2 SAFETY INFORMA TION W ARNIN G: Im prope r in - st al l a t i on , ad ju s t m e nt , al - te ra t i o n , se rv i c e or mai nt e - na nc e ca n ca us e in j u r y or pr op e r t y da m ag e. Re f e r to th is ma nu a l fo r co rr e c t in - st al l a t i on an d o p e r a ti on a l p r o ce du re s. F or a s s i s -[...]

www .desatech.com 1 19344-01B 3 Natural and Propane/LP Gas: Natural and pro - pane/ LP gases are fuel gases. Fuel gases are odorless. An odor-making agent is added to fuel gases. The odor helps you detect a fuel gas leak. However , the odor added to fuel gas can fade. Fuel gas may be present even though no odor exists. Make certain you read and und[...]

www .desatech.com 1 19344-01B 4 12 . Operating heater above elevations of 4,500 feet could cause pilot outage. 13. To prevent performance problems, do not use propane/LP fuel tank of less than 100 lbs. capacity. 14. Provide adequate clearances around air openings. LOCAL CODES Install and use heater with care. Follow all lo - cal codes. In the absen[...]

www .desatech.com 1 19344-01B 5 AIR FOR COMB USTION AND VENTILA TION WARNING: This heater shall not be installed in a conned space or unusually tight con - struction unless provisions are pro vide d fo r ad equ ate com bus - tion and ventilation air. Re ad the following instructions to insure proper fresh air for this and other fuel-burning appl[...]

www .desatech.com 1 19344-01B 6 AIR FOR COMB USTION AND VENTILA TION Continued DETERMINING FRESH-AIR FLOW FOR HEA TER LOCA TION Determining if Y ou Have a Conned or Unconned Space Use this work sheet to determine if you have a conned or unconned space. Space : Inclu des the room in which you will instal l heater plus any adjoining rooms[...]

www .desatech.com 1 19344-01B 7 Figure 3 - V entilation Air from Outdoors VENTILA TION AIR V entilation Air From Inside Building This fresh air would come from an adjoining unconned space. When ventilating to an adjo inin g uncon ned spac e, you must provid e two perman ent openin gs: one withi n 12" of the ceiling and one within 12"[...]

www .desatech.com 1 19344-01B 8 INST ALLA TION ITEMS Before installing heater, make sure you have the items listed below . • for propane/LP gas, external regulator (supplied by installer) • piping (check local codes) • sealant (resistant to propane/LP gas) • equipment shutoff valve * • ground joint union • sediment trap • tee joint ?[...]

www .desatech.com 1 19344-01B 9 INST ALLA TION Continued THERMOST A T SENSING BULB (Thermostat Models Only) The thermosta t sensing bulb has been placed below the heater . 1. Place clamp on thermostat sensing bulb as shown in Figure 5. Clamp is provided in hardware package. 2. Snap clam p into upper mount ing hole as sh ow n in Fig ure 5. Mo un tin[...]

www .desatech.com 1 19344-01B 10 INST ALLA TION Continued 30,000 Btu/Hr Models 20,000 Btu/Hr Models Figure 8 - Mounting Bracket Clearances Attaching Mounting Bracket T o W all Note: Wall anchors, mounting screws and spacers are in hardware package. The hard - ware package is provided with heater . Attaching T o W all Stud Method For attaching mount[...]

www .desatech.com 1 19344-01B 1 1 Figure 12 - Installing Bottom Mounting Screws Side View Front View W all Spacer Heater Installing Bottom Mounting Screws 1. Loca te two bottom mount ing holes. These holes are near bottom on back panel of heater (see Figure 12). 2. Mark screw locations on wall. 3. Remove heater from mounting bracket. 4. If installi[...]

www .desatech.com 1 19344-01B 12 CONNECTING TO GAS SUPPL Y W ARNING: This appliance requires a 3/8" NPT (National Pipe Thread) inlet connection to the pressure regulator . W ARNING: A qualied ser - vic e pers on mus t conne ct h eat er to gas supply . Follow all local codes. W ARNING: For natural gas, never connect heater to private (non-ut[...]

www .desatech.com 1 19344-01B 13 * A CSA design-certied equipment shutoff valve with 1/8" NPT tap is an acceptable al - ternative to test gauge connection. Purchase the optional CSA design-certied equipment shutoff valve from your dealer . See Acces- sories , page 26. CHECKING GAS CONNECTIONS W ARNI NG : T est all gas pip in g and connec[...]

www .desatech.com 1 19344-01B 14 3. Check all joints from gas meter for natural gas (see Figure 17) or propane/LP supply tank for propane/LP gas, to equipment shutoff valve (see Figure 18). Apply a noncorrosive leak detection uid to all joints. Bubbles forming show a leak. 4. Correct all leaks at once. PRESSURE TESTING HEA TER GAS CONNECTIONS 1.[...]

www .desatech.com 1 19344-01B 15 6. Th e r m os t a t M o d el s : Tur n co n t r o l k n o b counterclockwise to the PILOT position. Press in control knob for ve (5) seconds. Manual Models: Press in and turn control knob counterclockwise to the PI - LOT position. Keep control knob pressed in for ve (5) seconds. 7. With contro l knob press ed[...]

www .desatech.com 1 19344-01B 16 OPERA TING HEA TER Continued THERMOST A T CONTROL OPERA TION The thermostatic control used on these models differs from standard thermostats. Standard thermostats simply turn on and off the burner . The therm ost at used on this heate r sens es the room temp erat ure . The ther mos tat adjusts the amount of gas o[...]

www .desatech.com 1 19344-01B 17 BURNER FLAME P A TTERN W ARNING: If yellow tipping occurs, your heater could pro - duce increased levels of carbon monoxide. NOTICE: Do not mistake orange ames with yellow tipping. Dirt or other ne particles enter the heater and burn causing brief patches of orange ame. Figure 24 shows a correct burner a[...]

www .desatech.com 1 19344-01B 18 CLEANING AND MAINTENANCE W ARNING: T urn off heater and let cool before cleaning. CAUTION: Y ou must keep control areas, burner and circu - lating air passageways of heater clean. Inspect the se areas of heater before each use. Have heater inspected yearly by a qualied service person. Heater may need more frequen[...]

www .desatech.com 1 19344-01B 19 TROUBLESHOO TING WAR NI NG : T ur n off and unp lu g he at er and le t co ol be fo re ser vi cing . Onl y a q ual i ed ser vi ce per so n s ho uld se rv ice an d rep ai r h eat er . CAUTION: Never use a wire, needle or similar object to clean ODS/pilot. This can damage ODS/pilot unit. Note: All troubleshooting it[...]

www .desatech.com 1 19344-01B 20 OBSERVED PROBLEM ODS/pilot lights but flame goes out when control knob is released Burner does not light after ODS/pilot is lit Delayed ignition of burner Burner backring during com - bustion REMEDY 1. Press in control knob fully 2. After ODS/pilot lights, keep control knob pressed in 30 seconds 3. Wait one minut[...]

www .desatech.com 1 19344-01B 21 TROUBLESHOO TING Continued OBSERVED PROBLEM Y ellow ame during burner combustion Slight smoke or odor during initial operation Heater produces a whistling noise when burner is lit White powder residue forming within burner box or on adja - cent walls or furniture Heater produces a clicking/ ticking noise just aft[...]

www .desatech.com 1 19344-01B 22 W ARNING: 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. Fol - low the gas supplier ’ s instructions. • If you cannot reach your gas [...]

www .desatech.com 1 19344-01B 23 SPECIFICA TIONS WMN20A, GWN20T A • Btu (V ariable): 10,000/20,000 Btu/Hr • T ype Gas: Natural Only • Ignition: Piezo • Pressure Regulator Setting: 3" W .C. • Inlet Gas Pressure (in. of water): Maximum - 10.5", Minimum - 4" GWN30T A • Btu (V ariable): 15,000/30,000 Btu/Hr • T ype Gas: Nat[...]

www .desatech.com 1 19344-01B 24 4* 20 4** 17 18** 19** 2 3 5 6 8 16 9 10 1 1 12 13 14 18* *Manual Control Models Only **Thermostat Models Only 19* 7 1 21* 22* 15 9 ILL USTRA TED P ARTS BREAKDOWN MODELS WMN20A, WMP20A, GWN20T A, GWP20T A, GWN30T A AND GWP30T A[...]

www .desatech.com 1 19344-01B 25 P ARTS LIST This list contains replaceable parts used in your heater . When ordering parts, follow the instructions listed under Replacement Parts on page 23 of this manual. KEY NO. P ART NO. DESCRIPTION QTY . 1 097159-04 Piezo Ignitor •••••• 1 2 107673-01 Front Panel •••• 1 107676-01 Front Panel[...]

www .desatech.com 1 19344-01B 26 ACCESSORIES Pu rc ha se the se hea te r ac ce ss or ies fr om you r lo ca l de aler . If the y ca n no t su pply the se acc es - so ri e s , e ith er co nt a ct you r ne ar e st Parts Cent ral (see page 27) or call DESA Heating Products at 1-866-672-6040 for referral information. Y ou can also write to the address l[...]

www .desatech.com 1 19344-01B 27 T ool & Equipment Co. 5 Manila Ave Hamden, CT 06514-0322 1-800-397-7553 203-248-7553 Portable Heater Parts 342 N. County Rd. 400 East V alparaiso, IN 46383-9704 219-462-7441 1-888-619-7060 www .portableheaterparts.com sales@portableheaterparts.com techservice@portableheaterparts.com FBD 1349 Adams Street Bowling[...]

Always specify model and serial numbers when communicating with the factory . We reserve the right to amend these specications at any time without notice. The only warranty applicable is our standard written warranty . We make no other warranty , expressed or implied. 1 19344-01 Rev . B 05/06 2701 Industrial Drive P .O. Box 90004 Bowling Green, [...]