Desa VJM36 Series Quick start guide

Save this manual for future reference.
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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 re-
placement parts or accessory items when needed. Keep
it with your other important papers.


ANS Z21.60, Z21.84 or RGA 2-72 standards or for use
with a vent-free gas log heater approved to ANS Z21.11.2
standard.
      
     



etc.) should be contacted before installation to deter-
mine the need to obtain a permit.
RESIDENTIAL AND OUTDOOR WOODBURNING FIREPLACE
OWNER’S OPERATION AND INSTALLATION MANUAL
(V)JM36, (V)JM42 AND (V)JM50
WOOD BURNING MASONRY FIREPLACES WITH INSULATION

www.desatech.com 117541-01B2
    -

damage or loss of life. Refer to this manual for assis-
      
installer or local distributor.
TABLE OF CONTENTS
Safety Information ............................................... 2
Specications ...................................................... 3
Fireplace Installation............................................ 6
Venting Installation .............................................. 8
Optional Gas Line Installation............................ 12
Brick Installation ................................................ 13
Glass Door Installation ...................................... 20
Operation and Maintenance Guidelines ............ 21
Technical Service............................................... 23
Replacement and Accessory Parts.................... 23
SAFETY INFORMATION
   

Before beginning the installation of the replace,
read these instructions through completely.
• This DESA replace and its components are
safe when installed according to this installation
manual. Unless you use DESA components,
which have been designed and tested for the
replace system, you may cause a re hazard.
• The DESA warranty will be voided by and
DESA disclaims any responsibility for the
following actions.
a. Modication of the replace, components,
doors, air inlet system and damper control.
b. Use of any component part not manufac-
tured or approved by DESA in combination
with a DESA replace system.
Proper installation is the most important step in
ensuring safe and continuous operation of the
replace. Consult the local building codes as to
the particular requirements concerned with the
installation of all factory built replaces.


the manufacturer's instructions


use with this insert.

 

or liquids in the vicinity of this
or any other appliance.
 
appliance should be located
     
furniture and draperies.
 

the appliance.
• Never leave children unat-


  

only. When processed wood fuel

stir the logs while they are burn-

beenevaluatedfortheapplication

warnings and caution markings
on packaging prior to use.

used as a substitute for a furnace

supplemental heat only.

www.desatech.com
117541-01B 3
SPECIFICATIONS

10.5"
15.375"
0.625" 45"
29"
26.625"
22"
36"
21.5"
3.5"
10.75"
1"
49"
8"
58"
30"
36"
45"
12"
9.5"
7"
67"
7.5"
11/2" AIR SPACE
BACK AND SIDES
0" TO
BOTTOM
GAS LINE
KNOCKOUTS
12" EACH SIDE
COMBUSTIBLE
WALL BOARD
NO COMBUSTIBLE
MATERIAL ON FACE
MINIMUM 12" TO
PERPENDICULAR
SIDEWALL
HEARTH EXTENSION
60" X 20"
1" CHIMNEY AIRSPACE
CLEARANCE TO
COMBUSTIBLE MATERIAL
TERMINATION
SQUARE CHASE-TOP
ROUND TOP TERMINATION
OUTSIDE AIR
20"
GAS LINE
KNOCK OUTS
AIR KIT
KNOCK OUT
LEFT SIDE

www.desatech.com 117541-01B4
SPECIFICATIONS Continued

10.5"
17"
0.625" 51"
30.5"
28.5"
21.25"
41.25"
23.5"
24.25"
3.5"
13"
1"
49"
8"
58"
30"
42"
51"
12"
9.5"
8.5"
67"
11"
GAS LINE
KNOCK OUTS
AIR KIT
KNOCK OUT
LEFT SIDE
OUTSIDE AIR
11/2" AIR SPACE
BACK AND SIDES
0" TO
BOTTOM
GAS LINE
KNOCKOUTS
12" EACH SIDE
COMBUSTIBLE
WALL BOARD
NO COMBUSTIBLE
MATERIAL ON FACE
MINIMUM 18" TO
PERPENDICULAR
SIDEWALL
HEARTH EXTENSION
66" X 20"
2" CHIMNEY AIRSPACE
CLEARANCE TO
COMBUSTIBLE MATERIAL
ROUND TOP TERMINATION
TERMINATION
SQUARE CHASE-TOP

www.desatech.com
117541-01B 5
SPECIFICATIONS Continued

10.5"
17"
50"
23.5"
32.75"
3.5"
13"
9.5"
8.5"
2" CHIMNEY AIRSPACE
CLEARANCE TO
COMBUSTIBLE MATERIAL
TERMINATION
SQUARE CHASE-TOP
ROUND TOP TERMINATION
COMBUSTIBLE
WALL BOARD
NO COMBUSTIBLE
MATERIAL ON FACE
0" TO
BOTTOM
OUTSIDE AIR
11/2" AIR SPACE
BACK AND SIDES
GAS LINE
KNOCKOUTS
12" EACH SIDE
MINIMUM 18" TO
PERPENDICULAR
SIDEWALL
HEARTH EXTENSION
74" X 20"
0.625" 59"
38.5"
28.5"
21.25"
11"
1"
49"
8"
58"
30"
50"
59"
12"
67"
LEFT SIDE
GAS LINE
KNOCK OUTS
AIR KIT
KNOCK OUT

www.desatech.com 117541-01B6
FIREPLACE INSTALLATION

To determine the safest and most efcient location
for the replace, 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 replace 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. An outside air kit is available with this replace
(see Optional Outside Air Kit on page 8).


Back and sides of replace 1 1/2" min.*
Front of replace 48" min.
Floor** 0" min.
Perpendicular wall to opening 18" min.
Model JM36 12" min.
Top spacers 0" min.
Mantel clearances see Mantels, page 7
Chimney outer pipe surface 2" min.
Model JM36 1" min.
* Not required at nailing anges
** See step 2 of Framing
-
quired air spaces with insulation
or other materials.

Residential Installation
The minimum height of the chimney, measured
from the base of the replace to the ue gas outlet
of the termination, is 16 feet for straight ue or a
ue 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 replace, chimney sec-
tions and the height of the termination assembly
at the level of the ue gas outlet (see Figure 15,
page 11).

Outdoor Installation
The minimum height of the chimney, measured
from the base of the replace to the ue gas outlet
of the termination, is 9.5 feet (minimum of 4 feet
of chimney pipe sections required for outdoor
installation).

1. Frame the opening for the replace using the
dimensions shown in Figures 1 and 2.
2. If the replace is to be installed directly on
carpeting, tile (other than ceramic) or any
combustible material other than wood oor-
ing, the replace must be installed upon a
metal or wood panel extending the full width
and depth of the replace.
3. Set the replace directly in front of this open-
ing and slide the unit back until the nailing
anges touch the side framing.
4. Check the level of the replace and shim with
sheet metal if necessary.
5. Before securing replace to prepared framing,
the ember protector (provided) must be placed
between the hearth extension (not supplied)
and under the bottom front edge of the re-
place to protect against glowing embers falling
through. If the replace is to be installed on
a raised platform, a Z-type ember protector
(not supplied) must be fabricated to t your
required platform height. The ember protector
should extend under the replace a minimum
of 1 1/2". The ember protector should be made
of galvanized sheet metal (28 gauge minimum
to prevent corrosion.
6. Using screws or nails, secure the replace to
the framing through anges located on the
sides of the replace.
30.125"
59" (50" Models)
58.125"
67.125"
51.25" (42" Models)
45.25" (36" Models)
28.250" (36" Models)
Figure 1 - Framing Dimensions
71" (50" Models)
100" (50" Models)
65" (42" Models)
92" (42" Models)
86.5" (36" Models)
61" (36" Models) Maintain 1 1/2"
Clearance at Sides
and Back of Fireplace
1 1/2" Clearance
Not Required at
Nailing Flanges
Figure 2 - Corner Installation

www.desatech.com
117541-01B 7
Note: For outdoor installations, the replace en-
closure must allow for adequate drainage and fresh
air ventilation. It is recommended that a sealed,
corrosion resistant catch pan with provision for
drainage be installed under the replace within
the replace enclosure.
HEARTH ExTENSION
A hearth extension projecting a minimum of 20"
in front of and a minimum of 12" beyond each
side of the replace opening is required to protect
combustible oor construction in front of the re-
place. Fabricate a hearth extension using a material
which meets the following specications: 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 ber,
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
is to be covered, use noncombustible material such
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
replace frame and hearth extension with a non-
combustible material (see Figure 3).

is to be installed only as shown

FIREPLACE INSTALLATION
Continued
Figure 3 - Hearth Extension
Seal Gap
Fireplace Front
Ember Protector
Fireplace Front
Raised Hearth
Fireplace Front
Elevated
Ember Protector
Ember Protector
Seal Gap
Hearth
Extension

A mantel may be installed if desired (see Figure
4). Woodwork such as wood trims, mantels or any
other combustible material projecting from the
front face must not be placed within 12" (JM36) or
18" (JM42/50) of the replace opening. Combus-
tible materials above 12" (JM36) or 18" (JM42/50)
and projecting more than 1 1/2" from the replace
must not be placed less than 15" (JM36) or 21"
(JM42/50) from the top opening of the replace
(NFPA STD 211, Sec. 7-3.3.3).
Mantels or any other combustible material also
may come up to the side edge of the black metal
face of the replace just as long as the projection
from the front face fall within the limit shown in
Figure 4.
12 1/4" Ref.
6"
Ref.
15" Min.
(JM36)
21" Min.
(JM42/50)
12" Min. (JM36)
18" Min. (JM42/50)
11/2" Max.
3" Nom.
33°
Combustible
Material
Safe
Zone for
Projection of
Combustible
Materials
Fireplace
Opening
Upper
Section of
Fireplace
Figure 4 - Mantel Clearances to
Combustible Material
FIREBOX
SAFE ZONE
Top View of Fireplace
3" Max.
4.5"
Min. to
Perpendicular
Side Wall
12" - JM36
18" - JM42/50
7.75" (JM36)
11.5" (JM42/50)
33°
Combustible
Material Must
Not Overlap
Front Face

www.desatech.com 117541-01B8
Figure 6 - Lineal Gain

PART NO.  GAIN
Georgian Fireplace 66 1/2 "
12-12DM
12-12HT Pipe Section 10 5/8
"
18-12DM
18-12HT Pipe Section 16 5/8
"
24-12DM
24-12HT Pipe Section 23 5/8
"
36-12DM
36-12HT Pipe Section 34 5/8
"
48-12DM
48-12HT Pipe Section 46 5/8
"
RLT-12D
RLT-12HT Round Termination 7 3/4
"
*
STL-12D Square Chase-Top
with Slip Section 7
" to 15 " *
* The lineal gain for the terminations is mea-
sured to the ue gas outlet height.
Hemmed
End
12 3/8"
Stainless
Inner Pipe
12" Galvanized
Outer Pipe


Each double wall chimney section consists of a
galvanized outer pipe, a stainless steel inner ue
pipe and a wire spacer. The pipe sections must be as-
sembled independently as the chimney is installed.
When connecting chimney directly to the replace,
the inner ue pipe section must be installed rst with
the lanced side up. The outer pipe section can then
be installed over 5 the ue pipe section with the
hemmed end up. Press down on each pipe section
until the lances securely engage the hem on the re-
place starter. The wire will assure the proper spacing
between the inner and outer pipe sections.
Continue to assemble chimney sections as outlined
above, making sure that both the inner and outer
pipe sections are locked together. When install-
ing double wall snap-lock chimney together, it is
important to assure the joint between the chimney
sections is locked. Check by pulling chimney
upward after locking. The chimney will not come
apart if properly locked. It is not necessary to add
screws to keep the chimney together (exception,
see Figure 9, page 10).
VENTING INSTALLATION


The installation of an outside air kit should be per-
formed during the rough framing of the replace
due to the nature of it's location. Outside combus-
tion air is accessed through a vented crawl space
(AK4F) or through a sidewall (AK4).
   
inlet ducts shall not terminate
in attic space.
Figure 5 - Outside Air Kit
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
Vent Hood
Required for
Wall Installation
Air Inlet
Eyebrow
Vented Crawl Space
(Check Local Codes
Before Installing in a
Vented Crawl Space)

The DESA chimney 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 tting 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".

collar around the chimney at the
      
obstructed.Neveruseblowninsula-


www.desatech.com
117541-01B 9
VENTING INSTALLATION
Continued

1. To achieve desired offset, you may install
combinations of 12", 18", 24", 36" and 48"
length of double wall pipe (see offset chart
and Figure 7).
 RISE 
A B 12" 18" 24"  48"
4 3/8" 16 3/8" ELBOW SET ONLY
9 3/4" 25 1/2" 1
12 3/4" 30 3/4" 1
15" 34 3/4" 1
18" 40" 1 1
21 1/4" 46 1/4" 1
23 3/4" 49 1/4" 1 1
27 3/4" 56 3/4" 1
30" 60 3/4" 1 1
33" 66" 1
36" 71" 1 1
38 1/4" 75" 2
41 1/4" 80 1/4" 1 1 1
45" 86 3/4" 2
46 3/4" 89 1/2" 1 1 1
51" 97" 1 1
53 1/4" 101" 2
56 1/4" 106 1/4" 2
59 1/4" 111 1/2" 1 1 1
61 3/4" 115 1/2" 1 2
64 3/4" 120 3/4" 1 2
68 1/4" 127" 2 1
70" 130" 1 1 2
74 1/4" 137 1/2" 1 2 1
76 3/4" 141 1/2" 1 2 1
79 3/4" 146 3/4" 4
OFFSET CHART (22-50 FT. SYSTEM HEIGHT)
Figure 7 - Typical Offset Terminations
Return
Elbow
Offset
Elbow
Return
Elbow
Offset
Elbow
6' Max.
6' Max.
6' Max.
6' Max.
6' Max.
6' Max.
Return
Elbow
Offset
Elbow
Offset
Elbow
Return
Elbow
A B C
Offset
Elbow
Ceiling
Support Pipe
12S-12DM
Return
Elbow
Figure 8 - Ceiling Support Pipe
12S-12DM
2" Min.
Straps
Straps
Straps
Straps
Detail A
Return Elbow
Detail B
Angle Firestop
See Detail A
See Detail B
2. Chimney weight above offset rests on return
elbow. Straps must be securely nailed to rafters
or joists (see Figure 8, details a and b).
3. Maximum length of pipe between supports
(return elbow or 12S-12DM) is 6' of angle
run. Maximum of two 6' angle run sections
per chimney system (see Figure 7).
4. All pipe connections between the offset and
return must be secured with two screws on
the outer pipe only (see Figure 9, page 10).
Do not penetrate the inner stainless.

www.desatech.com 117541-01B10
VENTING INSTALLATION
Continued
Figure 9 - Elbow Offset
B
A
Screws


Firestop spacers are required at each point where
the chimney penetrates a oor space. Their purpose
is to establish and maintain the required clearance
between the chimney and the combustible materials.
When the pipe passes through a framed opening into
a living space above, the restop must be placed onto
the ceiling from below as shown in Figure 10.
They also provide complete separation from one oor
space to another or attic space as required by most
codes. When the double wall pipe passes through a
framed opening into an attic space, the restop must
be placed into an attic oor as shown in Figure 11.
Figure 10 - Firestop Spacer with Living
Space Above Ceiling
Figure 11 - Firestop Spacer with Attic
Space Above Ceiling
Existing
Ceiling
Frame
Firestop
Spacer
Screws or
Staples
(Min. of 8)
Firestop
Spacer
Screws or Staples
(Min. of 8)

To maintain a 1" (JM36) or 2" (JM42/JM50) clear-
ance to the pipe on a roof with a pitch, a rectangular
opening must be cut.
1. Determine the center point through which the
pipe will penetrate the roof.
2. Determine the center point of the roof. Pitch
is the distance the roof drops over a given
span, usually 12". A 6/12 pitch means that
the roof drops 6" for each 12" one measure
horizontally down from the roof rafters.
3. Use the roof opening chart (Figure 12) to
determine the correct opening length and
ashing required.
17" Min. 30" Min.
1" Min.
1" Min.
1" Min.
Opening "A"

Pitch Slope Opening



Flat 0° 17" V6F-10DM
0-6/12 26.6° 19" V6F-10DM
6/12-
12/12 45.0° 24" V12F-10DM

Pitch Slope Opening



Flat 0° 19.5" V6F-10DM
0-6/12 26.6° 22' V6F-10DM
6/12-
12/12 45.0° 27" V12F-10DM
Existing
Ceiling
Frame
19.5" Min. 30" Min.
2" Min.
2" Min.
2" Min.
Opening "A"
Figure 12 - Roof Opening Measurements