Desa VB42 Quick start guide

For more information, visit www.desatech.com
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.
-
place or for use with a vented gas log approved to ANS
Z21.60, Z21.84 or RGA2-72 standards or for use with a vent-
free gas log heater approved to ANS Z21.11.2 standard. A
DESA Heating, LLC hood must be installed when using a
vent-free log heater (see Accessories, page 18).
      
     
APPLIANCE.


etc.) should be contacted before installation to deter-
mine the need to obtain a permit.


WOOD BURNING FIREPLACE
OWNER’S OPERATION AND INSTALLATION MANUAL
MODELS (V)B42, (V)B42I, (V)B42L AND (V)B42LI
ICC-ES #ESR-2542

www.desatech.com 109036-01J2
SAFETY


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.
    -




only. When processed wood
  
poke or stir the logs while they

that have been evaluated for

     
caution markings on packaging
prior to use.

be used as a substitute for a fur-

for supplemental heat only.
-
  
service or maintenance can

loss of life. Refer to this manual
for assistance or additional in-
   
installer or local distributor.


Before beginning installation of this replace,
read these instructions through completely.
• This DESA Heating, LLC replace and its
components are safe when installed ac-
cording to this installation manual. Unless
you use DESA Heating, LLC components,
which have been designed and tested for
the replace system, you may cause a re
hazard.
• The DESA Heating, LLC warranty will be
voided by and DESA Heating, LLC dis-
claims any responsibility for the following
actions.
a. Modification of the fireplace, com-
ponents, doors, air inlet system and
damper control.
b. Use of any component part not manu-
factured or approved by DESA Heating,
LLC in combination with a DESA Heat-
ing, LLC replace system.
Proper installation is the most important step
in ensuring safe and continuous operation of
replace. Consult the local building codes as
to the particular requirements concerned with
the installation of all factory built replaces.
TABLE OF CONTENTS
Safety .................................................................. 2
Specications ...................................................... 3
Fireplace Installation............................................ 4
Venting Installation .............................................. 7
Optional Gas Line Installation............................ 13
Operation and Maintenance .............................. 14
Technical Service............................................... 15
Parts .................................................................. 16
Replacement Parts ............................................ 18
Accessories ....................................................... 18

www.desatech.com
109036-01J 3
SPECIFICATIONS
0" TO
BOTTOM
OUTSIDE AIR
(LEFT SIDE
ONLY)
TOP SPACERS
3/4" AIR
SPACE
BACK
AND
SIDES
HEARTH
EXTENSION
66" X 20"
12"
EACH SIDE
1" AIRSPACE
TO COMBUSTIBLE
COMBUSTIBLE
WALL BOARD
0" TO
MATERIAL
NO COMBUSTIBLE
MATERIAL ON FACE
GAS LINE
KNOCK OUT
AIR KIT KNOCK OUTS
ROUND TOP TERMINATION
GAS LINE
KNOCK OUTS
LEFT SIDE
RIGHT SIDE
NOT LESS
THAN 14" TO
PERPENDICULAR
SIDEWALL
SQUARE CHASE-TOP
TERMINATION
8.25"
10.375"
13"
37.5"
33"
44"
42"
21.5"
32"
6.5"
38.85"
14.438"
1.375"
25.375"
7"
7"
1"
8.25"
14"
44"
1"
1.75"
0.625"
28.5"
21.125"

www.desatech.com 109036-01J4
FIREPLACE INSTALLATION
SELECTING LOCATION
To determine safest and most efcient location
for replace, you must take into consideration
the following guidelines:
1. Location must allow for proper clearances
(see Figures 1 and 2).
2. Consider a location where replace will
not be affected by drafts, air conditioning
ducts, windows or doors.
3. A location that avoids 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 7).


Back and sides of replace 3/4" minimum*
Floor** 0" minimum
Perpendicular wall to opening 12" minimum
Top spacers 0" minimum
Mantel clearances see Mantels, page 6
Chimney outer pipe surface 1" minimum
* Not required at nailing anges
** See step 2 of Framing
-
quiredairspaceswithinsulation
or other materials.

Minimum height of chimney, measured from
base of replace to ue gas outlet of termina-
tion, is 14.5 feet for straight ue or a ue with
one elbow set. Maximum distance between
elbows is 6 feet. For systems with two elbow
sets, minimum height is 22 feet. Maximum
height of any system is 50 feet. This measure-
ment includes replace, chimney sections and
height of termination assembly at level of ue
gas outlet (see Figure 18, page 11).

1. Frame opening for replace using dimen-
sions shown in Figures 1 and 2.
2. If replace is to be installed directly on
carpeting, tile (other than ceramic) or any
combustible material other than wood
ooring, replace must be installed upon
a metal or wood panel extending full width
and depth of replace.
3. Set replace directly in front of this open-
ing and slide unit back until nailing anges
touch side framing.
4. Check level of replace and shim with
sheet metal if necessary.
5. Before securing fireplace to prepared
framing, ember protector must be placed
between hearth extension (not included)
and under bottom front edge of replace
to protect against glowing embers falling
through. If replace is to be installed on
a raised platform, a Z-type ember protec-
tor (not included) must be fabricated to
t your required platform height. Ember
protector should extend under replace a
minimum of 1 1/2". Ember protector should
be made of galvanized sheet metal (28
gauge minimum) to prevent corrosion.
6. Using screws or nails, secure replace to
framing through anges located on sides
of replace.
22"
37.625"
44.25"
Figure 1 - Framing Dimensions
52 1/2"
15 7/8"
22 1/2"
72 7/8"
Maintain 3/4"
Clearance at
Sides and
Back of
Fireplace
3/4" Clearance Not
Required at Nailing Flanges
Figure 2 - Corner Installation

www.desatech.com
109036-01J 5
HEARTH ExTENSION
A hearth extension projecting a minimum of
20" in front of and a minimum of 12" beyond
each side of replace opening is required to
protect combustible oor construction in front
of replace. Fabricate a hearth extension
using a material which meets the following
specications: a layer of noncombustible,
inorganic material having a thermal conductiv-
ity of K=0.84 BTU IN/FT, HR. F (or less) at 1"
thick. For example, if 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 manufacturer or supplier of
noncombustible material. If hearth extension
is to be covered, use noncombustible mate-
rial such as tile, slate, brick, concrete, metal,
glass, marble, stone, etc. Provide a means
to prevent hearth extension from shifting and
seal gap between replace frame and hearth
extension with a noncombustible 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
Seal Gap
Fireplace Front
Ember Protector
Fireplace Front
Elevated
Do Not Block Louver
Ember Protector
Seal Gap
Hearth
Extension


NO

www.desatech.com 109036-01J6
FIREPLACE INSTALLATION
Continued
Figure 4 - Mantel Clearances to
Combustible Material
Electrical
Bushing
Electrical
Cover
Plate
Rocker
Switch
Figure 6 - Fan Switch-Electrical Bushing
Electrical
Housing
Wire Nut (3x)
(Not Supplied)
Outer Wrapper
of Fireplace
Electrical Cover
Plate and
Electrical Bushing
Fireplace Chassis
Ground
To Power
Source
Receptacle
(Supplied)
Power Source Wiring
(Not Supplied)
Prewired Receptacle
and Ground

A mantel may be installed if desired (see
Figure 4). Woodwork such as wood trims,
mantels or any other combustible material
projecting from front face must not be placed
within 12" of replace opening (and within 9"
of top louver opening). Combustible materi-
als above 12" and projecting more than 1 1/2"
from replace must not be placed less than
12" from top opening of replace (NFPA STD
211, Sec. 7-3.3.3).
Mantels or any other combustible material
may come up to side edge of black metal face
of replace if projection from front face falls
within limits shown in Figure 5.

Fan or blower kit is optional with this replace
(for circulating models only). Use of blowers or
fans other than those manufactured by DESA
Heating, LLC voids warranty. Fan is operated
by pressing rocker switch (see Figure 6) in
lower right hand corner of fireplace face.
Blower is operated by turning control knob
(not shown).
Fan/blower kit electrical connections are
made through electrical cover plate on side
of replace a shown in Figure 6.
FIREBOX
SAFE ZONE
Figure 5 - Side Mantel Clearance
Top View of Fireplace
Min. 12" from
Perpendicular Side Wall
1"
0.625" Max.
33°
8"
Wiring Instructions
1. Remove electrical cover plate with bush-
ing from replace by removing 2 sheet
metal screws as shown in Figure 6.
2. Slide power source wiring through electri-
cal bushing opening and electrical cover
plate and make all necessary connec-
tions.
3. Slide all wiring connections in electrical
housing as shown in Figure 6.
4. Secure electrical cover plate with screws
previously removed.
Note: Electrical housing and cover plate have
sharp edges. Wear protective gloves.
Sheet
Metal
Screws
12 1/4" Ref.
1 1/2"
Max.
Upper Section
of Circulating
Fireplace
6"
Ref.
9"
Min.
33°
3" Nom. *Note: Drawing
Not To Scale
Safe Zone For
Projection of
Combustible
Materials
Combustible
Material
15"
Min.
12"
Min.
Fireplace Opening
To p of
Louvered
Opening

www.desatech.com
109036-01J 7
Figure 8 - Lineal Gain
LINEAL GAIN
PART NO. DESCRIPTION GAIN
42" Fireplace 37 1/2"
12-8DM
12-8HT Pipe Section 10 5/8"
18-8DM
18-8HT Pipe Section 16 5/8"
24-8DM
24-8HT Pipe Section 23 5/8"
36-8DM
36-8HT Pipe Section 34 5/8"
48-8DM
48-8HT Pipe Section 46 5/8"
RT-8DM Round Termination 6 7/8"*
RTL-8DM Round Termination 7 3/4"*
RTT-8DM Round Termination
with Slip Section
6 7/8" to
23 1/8"*
RTTL-8DM Round Termination
with Slip Section
8 1/2" to
21 1/2"*
ET-8DM Square Chase-Top 12"*
ETO-8DM Square Chase-Top
with Mesh 12"*
ETL-8DM Square Chase-Top
with Slip Section 7" to 15"*
ETLO-8DM
Square Chase-Top
with Mesh & Slip
Section
12" to
25 1/2"*
* The lineal gain for the terminations is
measured to the ue gas outlet height.
Hemmed
End
8" Stainless
Inner Pipe
12 3/8"
Galvanized
Outer Pipe
Figure 7 - 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)
VENTING INSTALLATION


Installation of outside air kit should be per-
formed during rough framing of 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).
See Figure 24 on page 15 for instruction of
operating air kit.
   
inlet ducts shall not terminate
in attic space.
    
   

termination.

DESA Heating, LLC chimney system con-
sists of 12", 18", 24", 36" and 48" snap-lock,
double-wall pipe segments, planned for
maximum adaptability to individual site re-
quirements. Actual lengths gained after tting
overlaps must be taken into consideration
(lineal gain) and are given in lineal gain chart
(see Figure 8).
Lineal gain is actual measurable length of a
part after two or more parts are connected.

collar around chimney at top of


chimney enclosure.

www.desatech.com 109036-01J8
VENTING INSTALLATION
Continued
Figure 9 - Typical Offset Installation
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-8DM
Return
Elbow


Each double wall chimney section consists
of a galvanized outer pipe, a stainless steel
inner ue pipe and a wire spacer. Pipe sec-
tions must be assembled independently as
chimney is installed. When connecting chim-
ney directly to replace, inner ue pipe sec-
tion must be installed rst with lanced side
up. Outer pipe section can then be installed
over ue pipe section with hemmed end up.
Press down on each pipe section until lances
securely engage hem on replace starter.
Wire will assure proper spacing between
inner and outer pipe sections.
Note: For Canada, use chimney parts des-
ignated HT.
Opening in collar around

not be obstructed. Never use

enclosure.
Continue to assemble chimney sections as
outlined, making sure that both inner and
outer pipe sections are locked together. When
installing double wall snap-lock chimney to-
gether, it is important to assure joint between
chimney sections is locked. Check by pulling
chimney upward after locking. Chimney will
not come apart if properly locked. It is not
necessary to add screws to keep chimney to-
gether (exception - see Figure 11, page 9).

1. To achieve desired offset, you may install
combinations of 12", 18", 24", 36" and
48" length of double wall pipe (see offset
chart, page 7, and Figure 9).
Note: For systems with 2 elbow sets, mini-
mum height is 22 feet. Maximum height
for any system is 50 feet.
2. Chimney weight above offset rests on
return elbow. Straps must be securely
nailed to rafters or joists (see Figure 10,
details A and B, page 9).
3. Maximum length of pipe between supports
(return elbow or 12S-8DM) is 6' of angle
run. Maximum of two 6' angle run sections
per chimney system (see Figure 9).
4. All pipe connections between offset and
return must be secured with two screws
on outer pipe only (see Figure 11, page
9). Do not penetrate inner stainless.

www.desatech.com
109036-01J 9
Figure 11 - Elbow Offset
B
A
Screws
Figure 10 - Ceiling Support Pipe 12S-8DM
 RISE 
A B 48"  24" 18" 12"
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 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 1
56 1/4"106 1/4"2
59 1/4"111 1/2"1 1 1
61 3/4"115 1/2"2 1
64 3/4"120 3/4"2 1
68 1/4" 127" 1 2
70" 130" 2 1 1
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)
2" Min.
Straps Straps
Straps
Straps
Detail A
Return Elbow
Detail B
Angle
Firestop
See Detail A
See Detail B
Ceiling Support
Pipe 12S-8DM
VENTING INSTALLATION
Continued

www.desatech.com 109036-01J10
VENTING INSTALLATION
Continued
Pitch Slope Opening



Flat 0° 15" V6F-8DM
0-6/12 26.6° 16 1/8" V6F-8DM
6/12- 12/12 45.0° 20 3/8" V12F-8DM
4. Remove shingles around opening mea-
sured. Cut out this section.
5. Add next sections of pipe until end
penetrates roof line. Check to see that
proper clearances are maintained. Extend
chimney by adding sections of double wall
pipe until pipe is minimum of 30" above
highest point of roof cutout. Termination
and chimney must extend a minimum of
36" above highest point where it passes
through roof.
Figure 14 - Roof Opening Measurements


Determine ashing to be used with roof open-
ing chart. Slide ashing over pipe until base is
at against roof. Replace as many shingles as
needed to cover exposed area and ashing
base. Secure in position by nailing through
shingles (see Figure 15, page 11). DO NOT
NAIL THROUGH FLASHING CONE.

When installing ashing on a metal roof, it
is required that putty tape be used between
ashing and roof. Flashing must be secured
to roof using #8 x 3/4" screws and then sealed
with roof coating to prevent leakage through
screw holes. A roof coating must also be ap-
plied around perimeter of ashing to provide
a proper seal.

Firestop spacers are required at each point
where chimney penetrates a floor space.
Their purpose is to establish and maintain
required clearance between chimney and
combustible materials. When pipe passes
through a framed opening into a living space
above, restop must be placed onto ceiling
from below as shown in Figure 12.
They also provide complete separation from
one oor space to another or attic space as
required by most codes. When double wall
pipe passes through a framed opening into
an attic space, restop must be placed into
an attic oor as shown in Figure 13.
Figure 12 - Firestop Spacer with Living
Space Above Ceiling
Figure 13 - Firestop Spacer with Attic
Space Above Ceiling

To maintain a 2" clearance to pipe on a roof with
a pitch, a rectangular opening must be cut.
1. Determine center point where pipe will
penetrate the roof.
2. Determine 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" measure
horizontally down from roof rafters.
3. Use roof opening chart (Figure 14) to
determine correct opening length and
ashing required.
If area above is a living space, install
restop below framed hole.
If area above is an attic or insulated area,
install restop above framed hole.
30"
(76.2 cm)
Minimum Measurements
Opening "A"
16
3
/
8
"
(48.3 cm)
2"
(5.1
cm)
2"
(5.1
cm)
2"
(5.1 cm)