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RESIDENTIAL AND OUTDOOR WOODBURNING FIREPLACE OWNER’S OPERATION AND INSTALLATION MANUAL
(V)JM36, (V)JM42 AND (V)JM50
WOOD BURNING MASONRY FIREPLACES WITH INSULATION
SAVE THIS BOOK
This book is valuable. In addition to instructing you on how to install and maintain your appliance, it also contains information that will enable you to obtain replacementpartsoraccessoryitemswhenneeded.Keep it with your other important papers.
This fireplace is approved for use as a wood burning fireplace or for use with a vented gas log approved to ANS Z21.60, Z21.84 or RGA 2-72 standards or for use withavent-freegaslogheaterapprovedtoANSZ21.11.2 standard.
This wood burning fireplace complies with UL127- CAN/ULS-S610-M87 standard as a FACTORY BUILT APPLIANCE.
FOR CANADA: The authority having jurisdiction (such as the municipal building department, fire department, etc.) should be contacted before installation to determine the need to obtain a permit.
Save this manual for future reference. For more information, visit www.desatech.com
WARNING: Improper installation, adjustment, alteration, service or maintenance can cause injury, property damage or loss of life. Refer to this manual for assistance or additional information. Consult a qualified installer or local distributor.
TABLE OF CONTENTS
Safety Information ............................................... |
2 |
Brick Installation ................................................ |
13 |
Specifications ...................................................... |
5 |
Glass Door Installation ...................................... |
20 |
Fireplace Installation ........................................... |
6 |
Operation and Maintenance Guidelines............ |
21 |
Venting Installation .............................................. |
8 |
Technical Service .............................................. |
22 |
Optional Gas Line Installation ........................... |
12 |
Replacement and Accessory Parts ................... |
23 |
SAFETY INFORMATION
IMPORTANT: Check local codes before installing this fireplace.
Before beginning the installation of the fireplace, read these instructions through completely.
•This DESA fireplace and its components are safewheninstalledaccordingtothisinstallation manual. Unless you use DESA components, which have been designed and tested for the fireplace system, you may cause a fire hazard.
•The DESA warranty will be voided by and DESA disclaims any responsibility for the following actions.
a.Modification of the fireplace, components, doors, air inlet system and damper control.
b.Use of any component part not manufacturedorapprovedbyDESAincombination with a DESA fireplace system.
Proper installation is the most important step in ensuring safe and continuous operation of the fireplace. Consult the local building codes as to the particular requirements concerned with the installation of all factory built fireplaces.
WARNING: Do not install a
fireplaceinsertinthisboxunless themanufacturer'sinstructions with the insert specifically state thisfireplacehasbeentestedfor use with this insert.
FOR YOUR SAFETY
•Do not store or use gasoline oranyotherflammablevapors orliquidsinthevicinityofthis or any other appliance.
•Due to high temperatures, the appliance should be located out of traffic and away from furniture and draperies.
•Do not place clothing or other flammablematerialsonornear the appliance.
•Never leave children unattended when a fire is burning in the fireplace.
WARNING: Use solid wood or processed solid fuel firelogs only. Whenprocessedwoodfuel firelogsareused,donotpokeor stir the logs while they are burning. Use only fire logs that have beenevaluatedfortheapplication in fireplace and refer to fire log warnings and caution markings on packaging prior to use.
Thisfireplaceisnotintendedtobe usedasasubstituteforafurnace to heat an entire home. Use for supplemental heat only.
2 |
www.desatech.com |
117541-01A |
SPECIFICATIONS Continued
MODELS VJM36 AND JM36
67.000
58.000
49.000
8.000
ROUND TOP TERMINATION
1" CHIMNEY AIRSPACE CLEARANCE TO COMBUSTIBLE MATERIAL
11/2" AIR SPACE
BACK AND SIDES 
OUTSIDE AIR
GAS LINE
KNOCKOUTS
0" TO |
12" EACH SIDE |
BOTTOM |
|
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12.000 |
|
26.625 |
|
30.000 |
SQUARE CHASE-TOP
TERMINATION
NO COMBUSTIBLE
MATERIAL ON FACE
COMBUSTIBLE
WALL BOARD
MINIMUM 12" TO
PERPENDICULAR
SIDEWALL
HEARTH EXTENSION 60" X 20"
29.00
7.500
22.000
0.625 |
45.000 |
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36.000 |
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45.000 |
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1.000 |
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AIR KIT |
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21.500 |
LEFT SIDE |
KNOCK OUT |
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GAS LINE |
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KNOCK OUTS |
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3.50 |
20.000 |
10.50 |
9.50 |
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7.0 |
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10.75 |
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15.375 |
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36.000 |
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117541-01A |
www.desatech.com |
3 |
SPECIFICATIONS Continued
MODELS VJM42 AND JM42
ROUND TOP TERMINATION SQUARE CHASE-TOP
TERMINATION
2" CHIMNEY AIRSPACE CLEARANCE TO COMBUSTIBLE MATERIAL
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NO COMBUSTIBLE |
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MATERIAL ON FACE |
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COMBUSTIBLE |
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WALL BOARD |
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11/2" AIR SPACE |
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BACK AND SIDES |
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OUTSIDE AIR |
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MINIMUM 18" TO |
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PERPENDICULAR |
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GAS LINE |
SIDEWALL |
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KNOCKOUTS |
HEARTH EXTENSION |
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66" X 20" |
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0" TO |
12" EACH SIDE |
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BOTTOM |
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12.000 |
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30.500 |
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11.000 |
67.000 |
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21.250 |
58.000 |
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49.000 |
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30.000 |
28.500 |
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0.625 |
51.000 |
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42.000 |
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8.000 |
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51.000 |
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1.000 |
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AIR KIT |
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24.250 |
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LEFT SIDE |
KNOCK OUT |
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GAS LINE |
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KNOCK OUTS |
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3.50 |
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23.500 |
10.50 |
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9.50 |
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8.50 |
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13.00 |
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41.250 |
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17.00 |
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www.desatech.com |
117541-01A |
SPECIFICATIONS
MODELS VJM50 AND JM50
67.000
58.000
49.000
8.000
ROUND TOP TERMINATION |
SQUARE CHASE-TOP |
|
TERMINATION |
2" CHIMNEY AIRSPACE CLEARANCE TO COMBUSTIBLE MATERIAL
NO COMBUSTIBLE
MATERIAL ON FACE
COMBUSTIBLE
WALL BOARD
11/2" AIR SPACE BACK AND SIDES
OUTSIDE AIR
|
MINIMUM 18" TO |
|
PERPENDICULAR |
|
SIDEWALL |
GAS LINE |
|
KNOCKOUTS |
HEARTH EXTENSION |
|
|
0" TO |
74" X 20" |
12" EACH SIDE |
BOTTOM
12.000
38.500 
11.000
21.250
28.500 |
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30.000 |
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0.625 |
59.000 |
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50.000 |
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59.000 |
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1.000 |
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AIR KIT |
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LEFT SIDE |
KNOCK OUT |
32.750 |
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GAS LINE |
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KNOCK OUTS |
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3.50 |
10.50 |
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9.50 |
23.500 |
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8.50 |
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13.00 |
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50.000 |
17.00 |
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117541-01A |
www.desatech.com |
5 |
FIREPLACE INSTALLATION
SELECTING LOCATION
To determine the safest and most efficient location for the fireplace, you must take into consideration the following guidelines:
1.The location must allow for proper clearances (see Figures 1 and 2).
2.Consider a location where the fireplace will not be affected by drafts, air conditioning ducts, windows or doors.
3.A location that avoids the cutting of joists or roof rafters will make installation easier.
4.Anoutsideairkitisavailablewiththisfireplace (see Optional Outside Air Kit on page 8).
MINIMUM CLEARANCE TO
COMBUSTIBLES
Back and sides of fireplace |
1 1/2" minimum* |
Front of fireplace |
48" minimum |
Floor** |
0" minimum |
Perpendicular wall to opening |
18" minimum |
|
12" min. JM36 |
Top spacers |
0" minimum |
Mantel clearances |
see Mantels, page 7 |
Chimney outer pipe surface |
2" minimum |
|
1" min. JM36 |
* Not required at nailing flanges ** See step 2 of Framing
WARNING: Do not pack requiredairspaceswithinsulation or other materials.
Minimum/Maximum Chimney Height for Residential Installation
The minimum height of the chimney, measured from the base of the fireplace to the flue gas outlet of the termination, is 16 feet for straight flue or a flue with one elbow set. The maximum distance between elbows is 6 feet. For systems with two elbow sets, the minimum height is 22 feet. The maximum height of any system is 50 feet. This measurement includes the fireplace, chimney sections and the height of the termination assembly at the level of the flue gas outlet (see Figure 15, page 11).
Minimum/Maximum Chimney Height for Outdoor Installation
The minimum height of the chimney, measured from the base of the fireplace to the flue gas outlet of the termination, is 9.5 feet (minimum of 4 feet of chimney pipe sections required for outdoor installation).
FRAMING
1.Frame the opening for the fireplace using the dimensions shown in Figures 1 and 2.
2.If the fireplace is to be installed directly on carpeting, tile (other than ceramic) or any combustible material other than wood flooring, the fireplace must be installed upon a metal or wood panel extending the full width and depth of the fireplace.
3.Set the fireplace directly in front of this opening and slide the unit back until the nailing flanges touch the side framing.
4.Check the level of the fireplace and shim with sheet metal if necessary.
5.Beforesecuringfireplacetopreparedframing, theemberprotector(provided)mustbeplaced between the hearth extension (not supplied) and under the bottom front edge of the fireplacetoprotectagainstglowingembersfalling through. If the fireplace is to be installed on a raised platform, a Z-type ember protector (not supplied) must be fabricated to fit your requiredplatformheight.Theemberprotector should extend under the fireplace a minimum
of 1 1/2". The ember protector should be made ofgalvanizedsheetmetal(28gaugeminimum to prevent corrosion.
6.Using screws or nails, secure the fireplace to the framing through flanges located on the sides of the fireplace.
59.250 (50")
51.250 (42") 45.250 (36")
67.125
58.125
30.125 28.250 (36")
Figure 1 - Framing Dimensions
61.000 (36")
65.000 (42")
71.000 (50")
MAINTAIN 1 1/2"
CLEARANCE AT
SIDES AND BACK
OF FIREPLACE
1 1/2" CLEARANCE
NOT REQUIRED AT
NAILING FLANGES
86.500 (36")
92.000 (42")
100.000 (50")
Figure 2 - Corner Installation
6 |
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117541-01A |
FIREPLACE INSTALLATION
Continued
Note: For outdoor installations, the fireplace enclosuremustallowforadequatedrainageandfresh air ventilation. It is recommended that a sealed, corrosion resistant catch pan with provision for drainage be installed under the fireplace within the fireplace enclosure.
HEARTH EXTENSION
A hearth extension projecting a minimum of 20" in front of and a minimum of 12" beyond each side of the fireplace opening is required to protect combustible floor construction in front of the fireplace.Fabricateahearthextensionusingamaterial which meets the following specifications: a layer of noncombustible, inorganic material having a thermal conductivity of K=0.84 BTU IN/FT, HR. F (or less) at 1" thick. For example, if the material selected has a K factor of 0.25, such as glass fiber, the following formula would apply:
0.25 x 1.0" = 0.30" thickness required
0.84
Thermal conductivity "K" of materials can be obtained from the manufacturer or supplier of the noncombustible material. If the hearth extension istobecovered,usenoncombustiblematerialsuch as tile, slate, brick, concrete, metal, glass, marble, stone, etc. Provide a means to prevent the hearth extension from shifting and seal gap between the fireplace frame and hearth extension with a noncombustible material (see Figure 3).
MANTELS |
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A mantel may be installed if desired (see Figure |
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4).Woodwork such as wood trims, mantels or any |
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other combustible material projecting from the |
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frontface mustnotbe placedwithin 12"(JM36)or |
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18" (JM42/50) of the fireplace opening. Combus- |
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tiblematerialsabove12"(JM36)or18"(JM42/50) |
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and projecting more than 1 1/2" from the fireplace |
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must not be placed less than 15" (JM36) or 21" |
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(JM42/50) from the top opening of the fireplace |
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(NFPA STD 211, Sec. 7-3.3.3). |
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Mantels or any other combustible material also |
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may come up to the side edge of the black metal |
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face of the fireplace just as long as the projection |
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from the front face fall within the limit shown in |
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Figure 4. |
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12 |
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/4" Ref. |
Combustible |
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1 |
Material |
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Safe |
6" |
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Zone for |
Ref. |
33° |
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Projection of |
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Combustible |
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3" Nom. |
Materials |
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15" Min. |
1 |
/2" Max. |
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(JM36) |
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1 |
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21" Min. |
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(JM42/50) |
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12" Min. (JM36) |
Upper |
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18" Min. (JM42/50) |
Section of |
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Fireplace |
WARNING:Hearthextension
is to be installed only as shown
in Figure 3.
Seal Gap
Fireplace Front
Ember Protector
Fireplace Front
Raised Hearth
Ember Protector 
Fireplace Front
Elevated
Hearth
Extension
Seal Gap 
Ember Protector
Fireplace |
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Opening |
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Top View of Fireplace |
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7.75" (JM36) |
FIREBOX |
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11.5" (JM42/50) |
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3" Max. |
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SAFE ZONE |
4.5" |
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33° |
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Min. to |
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Perpendicular |
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Side Wall |
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12" - JM36 |
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18" - JM42/50 |
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Figure 4 - Mantel Clearances to |
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Combustible Material |
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Figure 3 - Hearth Extension
117541-01A |
www.desatech.com |
7 |
VENTING INSTALLATION
OPTIONAL OUTSIDE AIR KIT (MODEL AK4/AK4F)
The installation of an outside air kit should be performed during the rough framing of the fireplace due to the nature of it's location. Outside combustion air is accessed through a vented crawl space (AK4F) or through a sidewall (AK4).
CAUTION: Combustion air inlet ducts shall not terminate in attic space.
Secure to Collars with Metal Tape, Screws or Straps (Min. of 1/4" x 20" in size)
Air Inlet
Location
Must Allow
For Bushes
or Snow
Vented Crawl Space
(Check Local Codes
Before Installing in a
Vented Crawl Space)
Air Inlet Eyebrow
Vent Hood Required for Wall Installation
Figure 5 - Outside Air Kit
CHIMNEY PIPE
The DESAchimney system consists of 12, 18, 24, 36 and 48" snap-lock, double-wall pipe segments, planned for maximum adaptability to individual site requirements. Actual lengths gained after fitting overlaps must be taken into consideration (lineal gain) and are given in the lineal gain chart (see Figure 6). Lineal Gain is the actual measurable length of a part after two or more parts are connected. For Canada, use chimney parts designated "HT".
WARNING: The opening in the collar around the chimney at the top of the fireplace must not be obstructed.Neveruseblowninsulation to fill the chimney enclosure.
LINEAL GAIN
PART NO. |
DESCRIPTION |
GAIN (IN) |
|
Georgian |
Fireplace |
66 1/2" |
|
12-12DM |
Pipe Section |
10 5/8" |
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12-12HT |
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18-12DM |
Pipe Section |
16 5/8" |
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18-12HT |
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24-12DM |
Pipe Section |
23 5/8" |
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24-12HT |
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36-12DM |
Pipe Section |
34 5/8" |
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36-12HT |
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48-12DM |
Pipe Section |
46 5/8" |
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48-12HT |
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RLT-12D |
Round Termination |
7 3/4"* |
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RLT-12HT |
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Square Chase-Top 7" to 15"* with Slip Section
* The lineal gain for the terminations is measured to the flue gas outlet height.
12" Galvanized |
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Outer Pipe |
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12 |
3 |
/8" |
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Hemmed |
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End |
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Stainless |
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Inner Pipe |
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Figure 6 - Lineal Gain |
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ASSEMBLY AND INSTALLATION OF |
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DOUBLE WALL CHIMNEY SYSTEM |
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Each double wall chimney section consists of a |
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galvanized outer pipe, a stainless steel inner flue |
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pipeandawirespacer.Thepipesectionsmustbeas- |
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sembled independently as the chimney is installed. |
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Whenconnectingchimneydirectlytothefireplace, |
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theinnerfluepipesectionmustbeinstalledfirstwith |
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the lanced side up. The outer pipe section can then |
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be installed over 5 the flue pipe section with the |
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hemmed end up. Press down on each pipe section |
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untilthelancessecurelyengagethehemonthefire- |
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placestarter.Thewirewillassuretheproperspacing |
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between the inner and outer pipe sections. |
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Continuetoassemblechimneysectionsasoutlined |
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above, making sure that both the inner and outer |
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pipe sections are locked together. When install- |
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ing double wall snap-lock chimney together, it is |
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important to assure the joint between the chimney |
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sections is locked. Check by pulling chimney |
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upward after locking. The chimney will not come |
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apart if properly locked. It is not necessary to add |
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screws to keep the chimney together (exception |
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- see Figure 9, page 10). |
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8 |
www.desatech.com |
117541-01A |
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