DesaメーカーWMP20Aの使用説明書/サービス説明書
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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 .
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.
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.
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.
www .desatech.com 1 19344-01B 5 AIR FOR COMB USTION AND VENTILA TION WARNING: This heater shall not be installed in a conned space or unusually tight con - struction unless provisions are pro vide d fo r ad equ ate com bus - tion and ventilation air.
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 Conned or Unconned Space Use this work sheet to determine if you have a conned or unconned space.
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 unconned space.
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.
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.
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 .
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).
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 qualied ser - vic e pers on mus t conne ct h eat er to gas supply .
www .desatech.com 1 19344-01B 13 * A CSA design-certied equipment shutoff valve with 1/8" NPT tap is an acceptable al - ternative to test gauge connection. Purchase the optional CSA design-certied equipment shutoff valve from your dealer . See Acces- sories , page 26.
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.
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.
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 .
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.
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.
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.
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 backring during com - bustion REMEDY 1. Press in control knob fully 2.
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 whe.
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.
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.
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 MODE.
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.
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.
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.
Always specify model and serial numbers when communicating with the factory . We reserve the right to amend these specications at any time without notice. The only warranty applicable is our standard written warranty . We make no other warranty , expressed or implied.
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