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Desa VM42P - page 1
Sav e this manual for future reference. For more information, visit www .desatech.com MODELS M36(B,H), M42(B ,H), VM36(B,H) AND VM42(B ,H) NA TURAL GAS MODELS M36P(B,H), M42P(B ,H), VM36P(B,H) AND VM42P(B ,H) PROP ANE/LP GAS B-VENT DECORA TIVE GAS FIREPLACE OWNER’S OPERA TION AND INST ALLA TION MANU AL FOR YOUR SAFETY — Do not store or use gaso ...
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Desa VM42P - page 2
www .desatech.com 108795-01N 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 . NOT FOR USE ...
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Desa VM42P - page 3
www .desatech.com 108795-01N 3 SAFETY INFORMA TION W ARNING: This product c o n t a i n s a n d / o r g e n e r a t e s chemicals known to the State of California to cause cancer or birth defects or other reproduc- tive harm. IMPORTANT: Read this owner’s man ual caref ully an d co mpl etel y before trying to assemble, op- erate or service this ? ...
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Desa VM42P - page 4
www .desatech.com 108795-01N 4 11. Keep the area around your fireplace clear of combustible materials, gasoline and other flammable vapor and liquids. Do not run fire- place where these are used or stored. Do not place items such as clothing or decorations on or around fireplace. 12. Do not use this fireplace to cook food or burn paper or othe ...
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Desa VM42P - page 5
www .desatech.com 108795-01N 5 W ARN ING: Inst alla tion of this appliance should be done by a qualified service person well trained in the installation of such appliances. Y ou will also need a building permit from your local Building and Safety Commissioner before installing this appliance; otherwise your insurance co. may not c over this applia ...
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Desa VM42P - page 6
www .desatech.com 108795-01N 6 Model 36 Model 42 Mo del 3 6 Mo de l 42 Mo del 3 6 Model 42 A 29" 36" I 40 1 / 4 " 44 1 / 4 " Q 13 7 / 8 " 14" B 5/8" 5/8" J 21" 24" R 10 1 / 2 " 12 1 / 2 " C 41" 48" K 8" 9" S 2 1 / 2 " 2 1 / 2 " D 12" 14" L 34 3 / 4 & ...
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Desa VM42P - page 7
www .desatech.com 108795-01N 7 PRE-INST ALLA TION PREP ARA TION CLEARANCES Minimum clearances to combustibles are: • Back and Sides of Outer Surround . . . 0" min. • Drywall to Sides of Front Face (Nailing Flanges) . . . . . . . . . . . . . . 0" min. • “B” V ent Surfaces . . . . . . . . . . . . . . . . 1" min. • Ceiling t ...
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Desa VM42P - page 8
www .desatech.com 108795-01N 8 PRE-INST ALLA TION PREP ARA TION Continued FRAMING 1. Frame appliance enclosure as illustrated in Figures 7 and 8. Note: If a wall covering is used to line the enclosure, then all measurements must be from the surface of the covering. 2. Place the appliance into the framing and secure it. Note: If appliance is to be r ...
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Desa VM42P - page 9
www .desatech.com 108795-01N 9 INST ALLING TRANSITION PIPE AND ST ARTER COLLAR The transition pipe and starter collar shown in Figu re 9 are suppli ed with the firep lace , una ttac hed and read y for ins tal lat ion . Rem ove the star ter col lar and set asi de. Slide the tran siti on pipe ove r the vent collar and attach with a minimum of three ...
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Desa VM42P - page 10
www .desatech.com 108795-01N 10 Maintain Listed Clearance 12' Min. 12' Min. 45 45 6' 8' 12' Min. 60 45 Position Firestop Position Firestop Position Firestop Listed V ent Cap Listed V e nt Cap Listed V e nt Cap Maintain Listed Clearance Maintain Listed Clearance Maintain Listed Clearance Maintain Listed Clearance Maintain Li ...
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Desa VM42P - page 11
www .desatech.com 108795-01N 1 1 CHECKING FOR PROPER VENTING After completing and checking the electrical, gas and vent connections, follow the lighting instructions and allow the main burner to run for approximately 5 minutes. Hold a lighted match or cigarett e near the top edge of the fireplace opening and play it along the entire length of the ...
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Desa VM42P - page 12
www .desatech.com 108795-01N 12 OPTIONAL WIRELESS HAND-HELD REMOTE CONTROL INST ALLA TION Note: If using optional wireless hand-held remote control, the wall switch is no longer operational. Installing Receiver 1. Remo ve the front refrac tory acce ss panel by li ft in g up and ang li ng ou t of th e fire bo x ope ni ng (see Fi gure 13, pag e 1 1) ...
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Desa VM42P - page 13
www .desatech.com 108795-01N 13 GAS LINE HOOK-UP W ARNING: Gas line hookup should be done by your gas supplier or a qualified service person. W ARNING: Before you pro- cee d, m ake sur e yo ur gas su pply is OFF . A manual shutof f valve has been included in the applianceʼ s gas supply system. Y ou may consider installing an extra gas shutof f va ...
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Desa VM42P - page 14
www .desatech.com 108795-01N 14 P I L O T ON OFF IN OUT Figure 21 - Connecting Flexible Gas Line to Millivolt V alve Gas Shutoff V alve Flexible Gas Line Do NOT Kink 1/2" NPT Incoming Gas Line Note: 1) Wire Connections Not Shown for Clarity 2) * 1/8" NPT Plugged T apping Red Surface Indicates For Propane/LP Use Only Pilot Adj Inlet Pressu ...
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Desa VM42P - page 15
www .desatech.com 108795-01N 15 0.5" 0.5" Figure 24 - Pan and Ember Material Clearances Grate Burner Pan Pan and Ember Material INST ALLA TION Continued LOG PLACEMENT FOR M36, M36P , VM36 AND VM36P MODELS 1. Pla ce small front rig ht log (log 1) on right front of grate as shown in Figure 25. 2. Pl ace la rge bac k lo g ( log 2 ) on to gra ...
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Desa VM42P - page 16
www .desatech.com 108795-01N 16 INST ALLA TION Continued LOG PLACEMENT FOR M42, M42P , VM42 AND VM42P MODELS 1. Place lar ge back log (log 1) onto grate making sure notches rest over grate (see Figure 29). 2. Ins ert lowe r end of log 2A bet we en the firs t two grat e finger s and positi on the upper end int o the notc h on the f ron t of l og 1 ...
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Desa VM42P - page 17
www .desatech.com 108795-01N 17 INST ALLA TION Continued COMBUSTION AIR KIT MODEL AK4 (OPTIONAL) The outside air kit may be installed on the left side of the fireplace only . The vent can be installed through any outside wall a minimum of three feet below fireplace termination cap. The handle to operate the damper door for the outside air inlet w ...
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Desa VM42P - page 18
www .desatech.com 108795-01N 18 6. Repeat the process for the opposite door assembly . 7. T o adjust the doors, slide them partially open. Using a screwdriver , loosen the hold-down screws in the spring clip (see Figure 36) and pivot plate. 8. Close both doors until evenly joined at the middle and note the gap at the outer edges of the face. 9. Reo ...
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Desa VM42P - page 19
www .desatech.com 108795-01N 19 OPERA TING FIREPLACE FOR YOUR SAFETY READ BEFORE LIGHTING 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. A. This appliance has a pilot which must be lighted by hand. When lighting the pilot, follow these instruc ...
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Desa VM42P - page 20
www .desatech.com 108795-01N 20 TO TURN OFF GAS TO APPLIANCE 1. T urn off the wall switch. 2. T urn off all electric power to the appliance if service is to be performed. 3. Fully open glass doors if installed. 4. Remove front hearth brick and control access panel. 5. T urn gas control knob clockwise to “OFF”. Do not force. 6 . Replace fr ont r ...
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Desa VM42P - page 21
www .desatech.com 108795-01N 21 INSPECTING B URNERS Continued BURNER FLAME P A TTERN Burn er flames will be ste ady; not liftin g or floati ng. Flames should go up through the middle of logset. Flames should not "spill" to the edges of the pan or sides of the logset. Figure 43 shows a typical flame pattern. If burner flame pattern dif ...
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Desa VM42P - page 22
www .desatech.com 108795-01N 22 WIRING DIAGRAM DO NOT CONNECT RED REPLACE F ACTOR Y WIRING WITH 105°C EQUIV ALENT OR HIGHER RA TING THERMOST A T WIRE 18 GA. RED/WHITE EXTERNAL WIRING USE ONL Y CLASS 2 N.C.SW (VENT SAFETY SHUTOFF SWITCH) WHITE TH/TP TP TH WA LL SWITCH (SUPPLIED) MANUA L DAMPER SWITC H N.O. SW TO 120V THERMOPILE PILOT BURNER IGNITOR ...
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Desa VM42P - page 23
www .desatech.com 108795-01N 23 TROUBLESHOO TING Note: Before troubleshoot ing the system, make sure the gas shutof f valve is ON. The two most common causes of a malfunctioning gas appliance are: 1. Loose wiring connections 2. Construction debris clogging the pilot and/or gas control valve filter OBSERVED PROBLEM Pilot will not light Pilot will n ...
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Desa VM42P - page 24
www .desatech.com 108795-01N 24 TROUBLESHOO TING Continued OBSERVED PROBLEM Pilot goes out when wall switch is ON Spark ignitor will not light pilot after repeated triggering of red button Fireplace produces a clicking/ ticking noise just after burner is lit or shut off POSSIBLE CAUSE 1. Millivolt output on thermo- pile too high 1. Defective ignito ...
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Desa VM42P - page 25
www .desatech.com 108795-01N 25 TROUBLESHOO TING Continued 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. Follow the gas supplier ’ s instructions. • If y ...
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Desa VM42P - page 26
www .desatech.com 108795-01N 26 ILL USTRA TED P ARTS BREAKDOWN MODELS M36(B,H), M36P(B,H), M42(B,H), M42P(B,H), VM36(B,H), VM36P(B,H), VM42(B,H) AND VM42P(B,H) 51 21 3 25 2 1 10 1 1 6 57 57 22 50 18 9 8 17 52 13 61 14 45 43 48 59/60 62 44 4 40 39 41 42 56 23 7 46 19 47 7 47 54 55 5 17 16 12 15 52 33 31 28 32 27 1 1 24 49 58 38 37 35 34 30 63 34 35 ...
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Desa VM42P - page 27
www .desatech.com 108795-01N 27 P ARTS LIST This list contains replaceable parts used in your heater . When ordering parts, follow the instructions listed under Replacement Parts on page 22 of this manual. ** Not a field replaceable part. KEY NO. M3 6(B ,H ) VM 36( B, H) M4 2(B ,H ) VM 42( B, H) D ESC RIP TI ON QTY 1 14153 14153 Micro Switch 1 2 * ...
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Desa VM42P - page 28
www .desatech.com 108795-01N 28 KEY NO. M3 6(B ,H ) VM 36( B, H) M4 2(B ,H ) VM 42( B, H) D ESC RIP TI ON QTY 12 106658-02 107812-02 Left Refractory , Std. Brick (M36B/M42B) 1 108164-02 108169-02 Left Refractory , Herringbone (M36H/M42H) 1 106658-01 107812-01 Left Refractory , Std. Brick (VM36B/VM42B) 1 108164-01 108169-01 Left Refractory , Her ri ...
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Desa VM42P - page 29
www .desatech.com 108795-01N 29 ILL USTRA TED P ARTS BREAKDOWN LOGSETS FOR MODELS M36(B,H), M36P(B,H), VM36(B,H) AND VM36P(B,H) KEY NO. P ART NUMBER DESCRIPTION QTY . - 107999-01 Log Set 1 108724-01 Right Front 9" Split Log 1 2 901098-01 Rear Log 1 3 108720-01 T op Right Log - 1 1 3 / 4 " 1 4 108721-01 T op Right Log - 16" 1 5 108722 ...
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Desa VM42P - page 30
www .desatech.com 108795-01N 30 KEY NO. P ART NUMBER DESCRIPTION QTY . - 107999-02 Log Set 1 901098-02 Rear Log 1 2A 108723-01 Left Front Log - 1 1" 1 2B 108839-01 Right Front Log - 15 3 / 4 " Round 1 3 108722-01 T op Left Log - 13 1 / 2 " Y -Log 1 4 108838-01 Inside T op Left Log - 15 3 / 4 " Split 1 5 108721-01 Inside T op Rig ...
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Desa VM42P - page 31
www .desatech.com 108795-01N 31 ACCESSORIES NOTICE: All accessories may not be available for all fireplace models. Purchase these firebox accessories from your local dealer . If they can not supply these accessories, call DESA ʼ s Sales Department at 1-866-672-6040 for information. Y ou can also write to the address listed on the back page of th ...
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Desa VM42P - page 32
LIMITED WARRANTY VENT -FREE FIREBO X DESA warrants this product to be free from defects in materials and components for four (4) years from the date of first purchase, provided that the product has been properly installed, operated and maintained in accordance with all applicable instructions. T o make a claim under this warranty the Bill of Sale ...
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