Desa GM42H Owner's manual

GM42H
Desa
Brand
Desa
Model
GM42H
Category
Fireplaces
Type
Owner's manual
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 WOOD BURNING 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
112435-01R2
-

damage or loss of life. Refer to this manual for assis-
      
installer or local distributor.
TABLE OF CONTENTS
Safety .................................................................. 2
 ...................................................... 3
............................................ 6
 .............................................. 8
............................ 13
 ................................................ 14
 ...................................... 22
 ............ 23
.................... 25
............................................... 26
SAFETY
   


    

 
-





 
   -


     -
   

 -
-



     
      





the manufacturer's instructions


use with this insert.

be used as a substitute for a fur-

for 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.
www.desatech.com
112435-01R 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"
1
1
/
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
74" 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
SAFETY
Continued


www.desatech.com
112435-01R4
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
1
1
/
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
112435-01R 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
1
1
/
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
112435-01R6
FIREPLACE INSTALLATION
    


     
      

        


 

 -



      
-

   
-

     

1
/
2



 


30.125"
(42"/50" Models)
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

      


 -

    
-

  


        
Optional Outside Air Kit



 
1
/
2

 
 
 
 
 

Mantels
 
 

Framing
-
quired air spaces with insulation
or other materials.

      -
        










 

www.desatech.com
112435-01R
HEARTH ExTENSION



    
       

  -





0.25
0.84


-

   
      

   
-


is to be installed only as shown

FIREPLACE INSTALLATION
Continued
Figure 3 - Hearth Extension













      
      
     
       

-


1
/
2


    

     
         



12
1
/
4
" Ref.






1
1
/
2


33°


Safe




Fireplace



Fireplace
Figure 4 - Mantel Clearances to
Combustible Material
FIREBOX
SAFE ZONE


4.5"







33°




6"
Ref.
www.desatech.com
112435-01R8
Figure 6 - Lineal Gain

PART NO.  
 Fireplace 66
1
/
2
"


 10
5
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8
"


 16
5
/
8
"


 23
5
/
8
"


 34
5
/
8
"


 46
5
/
8
"


 
3
/
4
"



"

"
-



12
3
/
8
"





     

    
     
-







collar around the chimney at the
     
obstructed. Never use blown insula-

VENTING INSTALLATION
Figure 5 - Outside Air Kit



















       
      


       

  
inlet ducts shall not terminate
in attic space.



-






      
      



www.desatech.com
112435-01R 9
VENTING INSTALLATION
Continued

 



      
     
     

      -
      
  
     

   
      


OFFSET CHART (22-50 FT. SYSTEM HEIGHT)
Figure 8 - Ceiling Support Pipe
12S-12DM












RISE 
A B 12" 18" 24"  48"
4
3
/
8
" 16
3
/
8
"

9
3
/
4
" 25
1
/
2
"
1
12
3
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4
" 30
3
/
4
"
1
15" 34
3
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"
1
18" 40"
1 1
21
1
/
4
" 46
1
/
4
"
1
23
3
/
4
" 49
1
/
4
"
1 1

3
/
4
" 56
3
/
4
"
1
30" 60
3
/
4
"
1 1
33" 66"
1
36" 
1 1
38
1
/
4
" 
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" 
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
" 
2 1
 130"
1 1 2

1
/
4
" 
1
/
2
"
1 2 1

3
/
4
" 141
1
/
2
"
1 2 1

3
/
4
" 146
3
/
4
"
4
Figure 7 - Elbow Offset
B

     


-




      

www.desatech.com
112435-01R10
VENTING INSTALLATION
Continued




      

     
   
       








Figure 10 - Firestop Spacer with Living
Space Above Ceiling
Figure 11 - Firestop Spacer with Attic
Space Above Ceiling


Frame

Spacer




Spacer






 

       

      



       


 



Frame
Figure 9 - Typical Offset Terminations






















A B C







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112435-01R 11
17" Min.
30" Min.
1" Min.
1" Min.
1" Min.
Opening "A"

Pitch Slope Opening



Flat 0°  
0-6/12 26.6° 19" 
6/12-
12/12
45.0° 24" 

Pitch Slope Opening



Flat 0° 19.5" 
0-6/12 26.6°  
6/12-
12/12
45.0°  
19.5" Min.
30" Min.
2" Min.
2" Min.
2" Min.
Opening "A"
Figure 12 - Roof Opening Measurements
VENTING INSTALLATION
Continued
 


     

-







       
      
-













Figure 13 - Flashing Installation





-






    
       

Figure 14 - Storm Collar







www.desatech.com
112435-01R12
VENTING INSTALLATION
Continued
Terminations/Spark Arrestor




-
-
low the installation instructions
provided with the termination
being used.


     
      




-

Note: If a decorative shroud is to be installed,
contact the manufacturer for specications.



















Figure 15 - Termination








-



    






     
      
   




18"

Typ.
Figure 16 - Multiple Chase Installation









Figure 17 - 10 Foot Rule
www.desatech.com
112435-01R 13
OPTIONAL GAS LINE INSTALLATION
Figure 18 - Gas Line Knockout








Fireplace







Seal





Fireplace



Repack


1/2" Black







Figure 19 - Gas Line Installation


        

Note: Before you proceed, make sure your
gas supply is turned off.
-

 -
-





 
-


 
      
      
   


Note: Secure incoming gas line to wood
framing to provide rigidity for threaded end.
 



  

    
and connections must be tested
for leaks after the installation
is completed. After ensuring
that the gas valve is on, apply
soap and water solution to all

forming show a leak. Correct

    
-


-


-
place with the chimney removed.
    

Standard for Decorative
Gas Appliance for Installation in Solid Fuel
Burning Fireplaces, ANS Z21.60, Z21.84 or
RG 2-72-
National Fuel Gas Code, ANSI
7223NFPA 54 latest edition.
    
has been used for wood burning,
    
be cleaned of soot, creosote and
ashes by a qualified chimney
cleaner. Creosote will ignite if
heavily heated.
    
decorative vented gas log, the
damper must be removed or per-
manently locked in the fully open
position and the glass doors must
be in the fully open position.
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112435-01R14
BRICK INSTALLATION
Figure 20 - Installing Brick
Brick



Brick


Installation of brick should be

in a permanent location.


-


      





      





       



Note: The left and right panels have identical
bricks. Please note, full size bricks are NOT
stamped.
LEFT PANEL
FULLFULL
D
C
B
A
RIGHT PANEL
B
C
A
FULL FULL
D
S S
LEFT PANEL
FULLFULL
D
C
B
A
RIGHT PANEL
B
C
A
FULL FULL
D
S S
Figure 21 - Installing Brick “S”




      

www.desatech.com
112435-01R 15
LEFT PANEL
REAR PANEL
RIGHT PANEL
HEARTH PANEL
AH
Q
P
AG
AC
AE
AFFULL
AF
AF
AD
AC
AG
AT
AG
Q
AI
Q
AI
C
C
D
D
FULL
C
D
C
G
FULL FULL
G
FULLFULL
FULL FULL
FULL
HH
I
I
M
M
ABL
FULL
D
C
C
FULL FULL
FULL
FULL FULL
FULL
FULL FULL
FULL
FULL
FULL
FULL
AE
AE
FULL
FULL
Q
AC
AE
AN
FULL
AC
AE
AE
FULL
FULL
AH
AG
AG
AF
AG
AF
AF
P
AB L L
D D
AD

BRICK INSTALLATION
Continued

HAAB OR HD
HD
HL
HAAB OR HD
HL
HXX
HAAH
HVV
HAAH
HAAH
HAAH
HVV
HVV
HWW
HAAG
HAAF
HAAF
HAAF
HF
HJ
HF
HF
HF
HE
HAAG
FULL
FULL
FULL
HL
HL
HL
HL
HL
HL
HSS
HTT
HF
HJ
HAAC
HV
HV
HV
HUU
FULL
FULL
FULL
FULL
FULL
FULL
HC
HD
HSS
HSS
RIGHT PANELREAR PANEL
HLHL
HJ
HJ
HJ
HJ
HL
HC
HZZ
HJ
HF
HAAA
HYY
HYY
HYY
FULL
FULL
FULL
FULL
FULL
FULL
HRR
HAAD
HAAD
HF
HQQ
HJ
HJ
HPP
L
L
L
AB
HF
HF
HL
HL
HOO
HAAE
FULL
FULL
FULL
FULL
LEFT PANEL
AB
HL
BOTTOM HEARTH
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112435-01R16
LEFT PANEL
REAR PANEL
RIGHT PANEL
HEARTH PANEL
R
Q
O
D
C
A
B
FULL
FULL
B
A
C
B
A
C
Z Q Z
F
E
F
E
F
F
FULL
FULL
FULL
E
E
FULL
E
F
FULL
FULL
FULL
E
F
FULL
FULL
U
U
Y
V V
W
W
K
K
K
K
X
L
L
L
L
AA
FULL
FULL
FULL FULL
FULL
FULL FULL
D
D
B
B
B
C
FULL
C
C
FULL
FULL
FULL
A
FULL
FULL
A
D
D
FULL
O
FULL
A
R
Q
D
FULL
FULL FULL FULL
FULL FULL
FULL FULL FULL
X
AA
Y
Full
**S
OR
Full
**S
OR

BRICK INSTALLATION
Continued



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112435-01R 
REAR PANEL
RIGHT PANEL
HEARTH PANEL
R
FULL
FULL
FULLFULL
FULL
FULLFULL
B
D
C A
B
C A
C
B
AN
Q
FULL
P Q Q
E
E
F F
FULL
FULLFULL FULL
E
FULL FULL
E
F
F F
FULL FULL FULL
F
E
FULL
FULL FULL FULL
FULL
E
G
FULL FULL FULL
G
FULLFULL
FULL FULL FULL
FULL FULL
HH
I I
M M
J
N
J
NL
K K
L
K
L
K
L
FULL FULL
QO
D
D
FULL
Full
OR
**S
FULL
FULL
Q
C
C
FULL
D
C
FULL
D
FULL
D
O
A
AT
FULL
B
A
FULL
FULL
B
B
RP
LEFT PANEL
**S
Full
OR

  
-


BRICK INSTALLATION
Continued
REAR PANEL
HEARTH PANEL
RIGHT PANEL
LEFT PANEL
N NLLLL
HL
HL
HL
HQ
HS
HP
HFHF HF
FULL
FULL
FULL FULL
FULL
FULLFULL
FULL
FULL
FULL
HF
HM
HZ
HO
HJ
HJ
HJ
HR
HGHG
HI HI
HN
FULL
FULL
FULL
FULL
FULLFULL
FULL
FULL
FULL
FULL
FULL FULL
HL
HL
HL HL
HL
HL
HAAF
HAAF
HAAF
HAAF
HAAF
HE
HDD
HJ
HFF
HK
HF
HB
HB
HB
FULL
FULL
FULL
FULL
FULL
FULL
HF
HF
HF
HC
HBB
HA
HAA
HA
HA
HC
HCC
HJ
HJ
HF HF
HT
HC
HC
HC
HH
HD
HD
HD HD
HX
HY
HU
HU
HU
HW
HF
HJ
HF
HEE
HV
HV
HV
HV
FULL
FULL
FULL
FULL
FULL
FULL
FULL
FULL
FULL
HC
HD
OR
OR
HC
www.desatech.com
112435-01R18
BRICK INSTALLATION
Continued

  B F I J O
 8 - - - - - - 2 2 2 - - 3 2 - - -
 9 - - 6 6 - - - - - - - - - - - -
 5 - - - - - - - - - - - - - - - 1
 5 - - - - - - - - - - - - - - - 1
  0 0 6 6 0 0 2 2 2 0 0 3 2 0 0 2

 Q R S T V Z    
 - - - - - - - - - - - 2 - -
 2 - - - - - - - - - - - - -
 1 - - - - - - - - - - - 3 1
 1 - - - - - - - - - - - 3 1
 4 0 0 0 0 0 0 0 0 0 0 2 6 2

      
 - - - - - 21
 - - - - 2 25
 3 3 3 1 - 21
 3 3 3 1 - 21
 6 6 6 2 2 88


           
 4 - - - 3 2 3 1 1 1 1
 6 1 2 - 1 1 - - - -
 6 1 1 - 1 5 3 - - - -
 3 - 1 1 4 1 1 - - - -
 19 2 4 1 9 12 14 1 1 1 1

           
 - - - - - - - - - - -
 3 1 1 - - - - - - - 3
 - - - - - - 3 1 1 1 -
 - - - 3 1 1 - - - 1 -
 3 1 1 3 1 1 3 1 1 2 -

        
 - 2 1 - - - 2 3 24
 1 - - - - - - - 
 - - - - - - - - 23
 - - - 3 2 4 - - 26
 1 2 1 3 2 4 2 3 100

www.desatech.com
112435-01R 19
BRICK INSTALLATION
Continued

  B F I J O
 10 - - - - - - - - - - 4 4 - - - -
 9 - - - - 6 6 - - - - - - - - - -
 9 3 3 3 3 - - - - - - - - - - 1 -
 9 3 3 3 3 - - - - - - - - - - 1 -
  6 6 6 6 6 6 0 0 0 0 4 4 0 0 2 0

 Q R S T V Z      
 - - - - 2 2 2 2 2 - 2 - - - - -
 1 - - - - - - - - 2 - - - - - -
 1 1 1 - - - - - - - - - - - - -
 1 1 1 - - - - - - - - - - - - -
 3 2 2 0 2 2 2 2 2 2 2 0 0 0 0 0


      
 - - - - - 30
 - - - - - 24
 - - - - - 25
 - - - - - 25
 0 0 0 0 0 104

              
 8 - - - - - 2 1 2 3 - 3 1 1
 9 3 - 2 1 - 1 - - 6 - 3 - -
 6 - 3 1 1 1 4 - - 1 1 2 - -
 9 - - 2 1 - 1 - 4 2 - 1 - -
 32 3 3 5 3 1 8 1 6 12 1 9 1 1

             
 1 1 - - - - - - 1 1 1 1 -
 - - 1 - 1 - - - - - - - -
 - - - 1 - 1 - 1 - - - - -
 - - - - - - - - - - - - 1
 1 1 1 1 1 1 0 1 1 1 1 1 1

      
 - - - - 4 2 33
 - - - - - - 
 - - - 5 - - 28
 3 1 1 - - - 26
 3 1 1 5 4 2 114

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112435-01R20
BRICK INSTALLATION
Continued

  B F I J O
 12 - - - - - - 2 2 2 2 4 4 2 2 - -
 15 - - - - 6 6 - - - - - - - - - 2
 9 3 3 3 3 - - - - - - - - - - 1 -
 9 3 3 3 3 - - - - - - - - - - 1 -
 45 6 6 6 6 6 6 2 2 2 2 4 4 2 2 2 2

 Q R S T V Z    
 - - - - - - - - - - - - - -
 3 - - - - - - - - - - - - -
 1 1 - - - - - - - - - - - -
 1 1 - - - - - - - - - - - -
 5 2 0 0 0 0 0 0 0 0 0 0 0 0


      
 - - - - - 32
 - - - - - 32
 - - - - - 25
 - - - - - 25
 0 0 0 0 0 114

              
 10 - - - - - 4 2 - 2 3 - 3 1
 12 3 - 5 2 - 2 - 1 - 2 - 2 -
 6 - 3 1 1 1 4 - - - 1 1 2 -
 9 - - 1 2 - 2 - - - 1 - 2 -
  3 3 5 1 12 2 1 2 1 9 1

            
 1 1 1 1 1 1 - - - - - -
 - - - - - - 1 - - - - -
 - - - - - - - - - - - -
 - - - - - - - 3 4 1 1 1
 1 1 1 1 1 1 1 3 4 1 1 1


         
 1 - - - - - - - 4 2 38
 - 1 - 1 - - - - - - 32
 - - 1 - 1 - 1 5 - - 28
 - - - - - 1 - - - - 28
 1 1 1 1 1 1 1 5 4 1 126
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Desa GM42H Owner's manual

GM42H
Desa
Brand
Desa
Model
GM42H
Category
Fireplaces
Type
Owner's manual
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