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Desa MVO18VPA - page 1
Sav e this manual for future reference. For more information, visit www .desatech.com W ARNING: 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 ...
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Desa MVO18VPA - page 2
www .desatech.com 1 14924-01B 2 W ARNING: Improper installation, adjustment, altera- tion, service or maintenance can cause injury or prop- erty damage. Refer to this manual for correct installation and operational procedures. For assistance or addi- tional information consult a qualified installer , service agency or the gas supplier . W ARN ING ...
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Desa MVO18VPA - page 3
www .desatech.com 1 14924-01B 3 SAFETY INFORMA TION W ARN ING : Th is pro duc t co n- ta ins an d/o r gen era tes c he mic als kno wn t o the Sta te o f Cal ifo rni a to cause c anc er or b irt h def ect s or oth er rep rod uct ive ha rm. W ARNING: Keep flue open when operating unit. I M P O RT AN T : Re ad th is o w n e r’ s m a n u al c ar e f ...
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Desa MVO18VPA - page 4
www .desatech.com 1 14924-01B 4 Y o u m u s t op er at e t h i s ap pl ia nc e w i t h a fir ep la ce s c r e e n i n pl ac e. Mak e su re firep lace sc ree n is c l o s e d b e f o r e r u n n i n g a p p l i a n c e . Keep the appliance area clear and free from combustible ma - terials, gasoline and other flam - mable vapors and liquids. Ch il ...
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Desa MVO18VPA - page 5
www .desatech.com 1 14924-01B 5 PRODUCT IDENTIFICA TION W A R N IN G: Fa il ur e t o po s it io n t h e pa rt s in a cc or da n c e wi th t he s e d ia gr am s or fa il u r e to us e o n l y p ar ts sp e ci fic al ly ap pr ov ed wi th t hi s a pp l i a nc e m ay r es ul t i n pr op - e rt y da ma g e o r pe rs o n al i nj ur y . Figure 1 - Product ...
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Desa MVO18VPA - page 6
www .desatech.com 1 14924-01B 6 CHECK GAS TYPE Use the cor rec t gas type (na tur al or propa ne /LP ) for your unit. If your gas supply is not correct, do not instal in fireplace. Call dealer where you bought the appliance for proper type of appliance. W ARNING: This appliance is equipped for (natural or pro- pane/LP) gas. Field conversion is not ...
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Desa MVO18VPA - page 7
www .desatech.com 1 14924-01B 7 INST ALLA TION Continued INST ALLING APPLIANCE W ARNING: Special care is required if you are installing the unit into a sunken fireplace. Y ou must raise the fireplace floor to allow access to gas log cont rols. Thi s wil l ins ure ade quate air flow and guard against sooting. Raise the fireplace floor using no ...
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Desa MVO18VPA - page 8
www .desatech.com 1 14924-01B 8 CA U T I O N : U s e o n l y ne w , b l a ck i r o n or st ee l p i p e. In te rn al ly -t in ne d co ppe r tu bi ng may b e use d in ce rta in are as. C he ck you r lo ca l co des . Us e p ipe o f 1/ 2" di ame ter or gr ea ter t o all ow pro per ga s vol - um e t o he at er . If pi pe is t oo sm al l, un due lo ...
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Desa MVO18VPA - page 9
www .desatech.com 1 14924-01B 9 INST ALLA TION Continued 3. Pr essu riz e su ppl y pi pin g sy ste m by ei ther 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 noncorrosive leak detection ? ...
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Desa MVO18VPA - page 10
www .desatech.com 1 14924-01B 10 INST ALLA TION Continued Figure 1 1 - Placement of Embers OPERA TING APPLIANCE FOR YOUR SAFETY READ BEFORE LIGHTING W ARNING: Keep flue open when operating unit. W ARNING: 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. ...
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Desa MVO18VPA - page 11
www .desatech.com 1 14924-01B 1 1 10. W ait one minute and move switch to the ON positi on to light burne r . Note : AUT O is onl y fun ctio nal when usin g option al rem ote cont ro l a cces sory . 1 1. Set flame adjustment knob to any level between HI and LO. TO TURN OFF GAS TO APPLIANCE 1. Push switch into OFF position. The pilot will remain li ...
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Desa MVO18VPA - page 12
www .desatech.com 1 14924-01B 12 Figure 15 - Correct Pilot Flame Pattern (Y our pilot may vary from pilots shown) Figure 16 - Incorrect Pilot Flame Pattern (Y our pilot may vary from pilots shown) Thermocouple Thermocouple INSPECTING B URNERS Check pilot flame pattern and burner flame pat- terns often. PILOT FLAME P A TTERN Y ou can view the pilo ...
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Desa MVO18VPA - page 13
www .desatech.com 1 14924-01B 13 TROUBLESHOO TING W ARNING: T urn off appliance and let cool before servicing. Only a qualified service person should service and repair heater . CAUTION: Never use a wire, needle or similar object to clean ODS/pilot. This can damage ODS pilot unit. Note: All troubleshooting items are listed in order of operation. P ...
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Desa MVO18VPA - page 14
www .desatech.com 1 14924-01B 14 OBSERVED PROBLEM ODS/pilot lights but flame goes out when control knob is re - leased Burner does not light after ODS/ pilot is lit Delayed ignition of burner Burner backfiring during com- bustion REMEDY 1. Press in control knob fully 2. After ODS/pilot lights, keep control knob pressed in for 30 seconds 3. W ait ...
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Desa MVO18VPA - page 15
www .desatech.com 1 14924-01B 15 OBSERVED PROBLEM Dark orange flame in burner dur- ing burner combustion Slig ht smoke or odor during in itia l operation Produces a whistling noise when burners are lit White powder residue forming within burner box or on adjacent walls or furniture REMEDY 1 . Check burner(s) for dirt and debris. If found, clean bu ...
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Desa MVO18VPA - page 16
www .desatech.com 1 14924-01B 16 OBSERVED PROBLEM Appliance produces a clicking/ ticking noise just after burners are lit or shut off Appliance produces unwanted odors Appliance shuts off in use Gas odor even when control knob is in OFF position Gas odor during combustion REMEDY 1. This is common with most appliances. If noise is excessive, contact ...
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Desa MVO18VPA - page 17
www .desatech.com 1 14924-01B 17 Purchase these appliances from your local dealer . If they can not supply thes e acce ssor ies, call DESA at 1-866-672-6040 for referral information. Y ou can also write to the address listed on the back page of this manual. EQUIPMENT SHUTOFF V AL VE GA5010 Equipment shutoff valve with 1/8" NPT tap. Fits 1/2&qu ...
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Desa MVO18VPA - page 18
www .desatech.com 1 14924-01B 18 ILL USTRA TED P ARTS BREAKDOWN MVO24VNA, MVO24VP A MVO18VNA, MVO18VP A 1 2 3 4 5 6 17 16 15 7 8 9 10 1 1 12 14 13 ...
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Desa MVO18VPA - page 19
www .desatech.com 1 14924-01B 19 P ARTS LIST This list contains replaceable parts used in your heater . When ordering parts, follow the instructions listed under Replacement Parts on page 17 of this manual. KEY P ART NUMBER NO. MVO24VNA MVO24VP A MVO18VNA MVO18VP A DESCRIPTION QTY . 1 1 1 1793-01 1 1 1793-01 1 1 1808-02 1 1 1808-02 Grate 1 2 1 1 18 ...
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Desa MVO18VPA - page 20
NOT A UPC 1 14924-01 Rev . B 01/05 114924 01 2701 Industrial Drive P .O. Box 90004 Bowling Green, KY 42102-9004 www .desatech.com Model Serial No. Date Purchased WARRANTY INFORMA TION KEEP THIS WARRANTY Always specify model and serial numbers when communicating with the factory . W e reserve the right to amend these specifications at any time with ...
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