Desa (V)GM36 Quick start guide

Save this manual for future reference.

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.





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 WOODBURNING FIREPLACE

OWNER’S OPERATION AND INSTALLATION MANUAL

(V)GM36, (V)GM42 AND (V)GM50

WOOD BURNING MASONRY FIREPLACES WITH INSULATION

(V)GM36H, (V)GM42H AND (V)GM50H

WOOD BURNING HERRINGBONE MASONRY FIREPLACES WITH

INSULATION

www.desatech.com 112435-01M2

    -



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 ................................................ 14

Glass Door Installation ...................................... 22

Operation and Maintenance Guidelines ............ 23

Technical Service............................................... 24

Replacement and Accessory Parts.................... 25

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.



used as a substitute for a furnace



supplemental heat only.



 



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

      

poke or stir the logs while they



that have been evaluated for



     

caution markings on packaging

prior to use.

   

glass doors fully opened or

fully closed when operating



www.desatech.com

112435-01M 3

SPECIFICATIONS



10.5"

15.375"

0.625" 45"

29"

26.625"

22"

36"

21.5"

3.5"

10.75"

49"

58"

30"

36"

45"

12"

9.5"

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 112435-01M4

SPECIFICATIONS Continued



10.5"

17"

0.625" 51"

30.5"

28.5"

21.25"

41.25"

23.5"

24.25"

3.5"

13"

49"

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

112435-01M 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"

49"

58"

30"

50"

59"

12"

67"

LEFT SIDE

GAS LINE

KNOCK OUTS

AIR KIT

KNOCK OUT

www.desatech.com 112435-01M6

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 GM36 12" min.

Top spacers 0" min.

Mantel clearance

see Mantels, page 7

Chimney outer pipe surface 2" min.

Models GM36 1" min.

* Not required at nailing anges

** See step 2 of Framing

-

quired air spaces with insulation

or other materials.



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).



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

112435-01M 7

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

Seal Gap

Hearth

Extension



A mantel may be installed if desired (see Figure 4).

Woodwork such as wood trims, mantels or any oth-

er combustible material projecting from the front

face must not be placed within 12" (GM36) or 18"

(GM42/50) of the replace opening. Combustible

materials above 12" (GM36) or 18" (GM42/50)

and projecting more than 1 1/2" from the replace

must not be placed less than 15" (GM36) or 21"

(GM42/50) 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.

15" Min.

(GM36)

21" Min.

(GM42/50)

12" Min. (GM36)

18" Min. (GM42/50)

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" - GM36

18" - GM42/50

7.75" (GM36)

11.5" (GM42/50)

33°

Combustible

Material Must

Not Overlap

Front Face

Ref.

www.desatech.com 112435-01M8

Figure 6 - Lineal Gain



PART NO.  

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

15" 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 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

112435-01M 9

VENTING INSTALLATION

Continued



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).

OFFSET CHART (22-50 FT. SYSTEM HEIGHT)

Figure 7 - Typical Offset Terminations

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-12DM

Return

Elbow

Figure 8 - Ceiling Support Pipe

12S-12DM

2" Min.

Straps

Detail A

Return Elbow

Detail B

Angle Firestop

See Detail A

See Detail B

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.



RISE 

A B 12" 18" 24"  48"

4 3/8" 16 3/8"

ELBOW SET ONLY

9 3/4" 25 1/2"

12 3/4" 30 3/4"

15" 34 3/4"

18" 40"

1 1

21 1/4" 46 1/4"

23 3/4" 49 1/4"

1 1

27 3/4" 56 3/4"

30" 60 3/4"

1 1

33" 66"

36" 71"

1 1

38 1/4" 75"

41 1/4" 80 1/4"

1 1 1

45" 86 3/4"

46 3/4" 89 1/2"

1 1 1

51" 97"

1 1

53 1/4" 101"

56 1/4" 106 1/4"

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"

www.desatech.com 112435-01M10

VENTING INSTALLATION

Continued

Figure 9 - Elbow Offset

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" (GM36) or 2" (GM42/GM50)

clearance 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.

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.

Opening "A"

Figure 12 - Roof Opening Measurements

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