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"

8.25"

14"

44"

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

Seal Gap

Hearth

Extension

Seal Gap

Fireplace Front

Ember Protector

Fireplace Front

Elevated

Do Not Block Louver

Ember Protector

Seal Gap

Hearth

Extension





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

0.625" Max.

33°

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

Ref.

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.

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

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

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"

(48.3 cm)

(5.1

cm)

(5.1

cm)

(5.1 cm)

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