Desa (V)UM36SR Quick start guide

For more information, visit www.desatech.com
WARNING: If the information in this manual is not


         


— WHAT TO DO IF YOU SMELL GAS
 
 

 

 

 -



MODELS (V)UM36(SR,SI,HR,HI), VCM-36U, (V)UM42(SR,SI,HR,HI),
VCM-42U, (V)UM50(SR,SI,HR,HI), VCM-50U
UNVENTED (VENT-FREE) UNIVERSAL FIREBOX
OWNER’S OPERATION AND INSTALLATION MANUAL

www.desatech.com 122274-01F2
TABLE OF CONTENTS
Safety .................................................................. 2
Local Codes......................................................... 4
Product Features................................................. 4
Locating Firebox.................................................. 4
Product Specications......................................... 5
Air For Combustion and Ventilation ..................... 8
Installation ......................................................... 10
Technical Service............................................... 23
Replacement Parts............................................ 23
Parts .................................................................. 24
Warranty ..............................................Back Cover
    -
       
-

      

      -


DO NOT INSTALL THE APPLIANCE IN THIS FIREBOX,
UNLESS THIS FIREBOX MEETS THE MINIMUM DIMEN-

WARNING: FOR USE ONLY WITH A LISTED, GAS-
FIRED UNVENTED DECORATIVE ROOM HEATER NOT


SAFETY







    
   
   




    -
    
    
    
    -





www.desatech.com
122274-01F 3
    


WARNING: Do not allow fans



    
   

-



    



 
    

     

    -
    

away from hot surfaces to avoid
-
      


-
dren when they are in the room



   

SAFETY
Continued

   

     


-
 
   
     
    -
 

1. Do not use this rebox as a wood burning
replace. Use only decorative unvented
room heaters (log sets).
2. Do not add extra logs or ornaments such as
pine cones, vermiculite or rock wool. Using
these added items can cause sooting.
3. Use only the provided hood. See Parts,
page 30.
4. Vent-free gas log heaters installed in these
reboxes require fresh air ventilation to
run properly. See Air for Combustion and
Ventilation, page 8.
5. Do not run vent-free heaters installed in
these reboxes
• where ammable liquids or vapors are
used or stored
• under dusty conditions
6. Do not use this rebox to cook food or
burn paper or other objects.
7. Turn unit off and let cool before servicing.
Only a qualied service person should
service and repair rebox.
8. Operating vent-free heaters installed in
these reboxes above elevations of 4,500
feet could cause pilot outage.
9. Do not use the rebox if it has been
under water.
10. Before using furniture polish, wax, carpet
cleaner or similar products, turn heater
off. If heated, the vapors from these prod-
ucts may create a white powder residue
within burner box or on adjacent walls
and furniture.
11. Provide adequate clearances around air
openings.

www.desatech.com 122274-01F4
State of Massachusetts: The installation
must be made by a licensed plumber
or gas fitter in the Commonwealth of
Massachusetts.
Sellers of unvented propane or natural
gas-fired supplemental room heaters
shall provide to each purchaser a copy of
527 CMR 30 upon sale of the unit.
Vent-free gas products are prohibited for
bedroom and bathroom installation in
the Commonwealth of Massachusetts.
PRODUCT FEATURES
OPERATION
This rebox is designed for use with approved
ANSI Z21.11.2 decorative type unvented room
heaters. (Physical size limitations apply. Refer
to minimum rebox requirements supplied
with log heater.) It requires no outside vent-
ing or chimney making installation easy and
inexpensive.
LOCAL CODES
LOCATING FIREBOX
PLANNING
Plan where you will install the rebox. This will
save time and money later when you install
the rebox. Before installation, consider the
following:
1. Where rebox will be located. Allow for
wall and ceiling clearances (see Installa-
tion Clearances, page 11).
2. Everything needed to complete installation.
3. These models CANNOT be installed in
a bedroom unless maximum Btu rating
of installed vent-free log set is less than
10,000 Btu/hr.
4. Proper air for combustion and ventilation
(page 8).
Install and use rebox with care. Follow all
local codes. In the absence of local codes,
use the latest edition of The National Fuel Gas
Code ANSI Z223.1/NFPA 54*. Firebox must
be electrically grounded in accordance with
the National Electrical Code, ANSI/NFPA70
(latest edition).
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269

www.desatech.com
122274-01F 5
PRODUCT SPECIFICATIONS

Figure 1 - 36" Models (V)UM36 Series and VCM-36U
30 1/2"
29"
30"
11 1/8"
54 1/2"
7 7/8"7"
36"
45 1/8"
35/16"
97/16"
50"
365/16"
7 3/8"
11 1/8"
36" HEARTH
1 5/16"
19 13/16"
(Ref.)
34 3/4"
22"
18 3/8"
3 3/4"
4 7/8"

www.desatech.com 122274-01F6
PRODUCT SPECIFICATIONS
Continued

Figure 2 - 42" Models (V)UM42 Series and VCM-42U
4 7/8"
54 1/2"
7 7/8"7"
36 5/16"
50"
42"
51 1/8"
32 3/8"
3 3/4"
30 5/16"
8 3/4"
13"
3 5/16"
9 7/16"
30"
11 1 /8"
23 13/16"
(Ref.)
1 5/16"
40 3/4"
25"
22 1/2"
42" HEARTH

www.desatech.com
122274-01F 7
PRODUCT SPECIFICATIONS
Continued

Figure 3 - 50" Models (V)UM50 Series and VCM-50U
365/16"
50"
8 3/4"
13"
35/16"
97/16"
23 13/16"
(Ref.)
1 5/16"
33"
40 3/4"
22 1/2"
50" HEARTH
59 1/8"
50"
7 7/8"7"
30"
54 1/2"
11 1/8"
32 3/8"
3 3/4"
38 5/16"
4 7/8"

www.desatech.com 122274-01F8
AIR FOR COMBUSTION AND VENTILATION

construction where:
 -
    
      
-112

and
 
and
      
     


    


If your home meets all of the three criteria
     
  Ventilation Air From Outdoors,

If your home does not meet all of the three
    Determining
Fresh-Air Flow For Firebox Location

The National Fuel Gas Code, ANSI Z223.1/
NFPA 54 denes a conned space as a space
whose volume is less than 50 cubic feet per
1,000 Btu per hour (4.8 m3 per kw) of the ag-
gregate input rating of all appliances installed
in that space and an unconned space as a
space whose volume is not less than 50 cubic
feet per 1,000 Btu per hour (4.8 m3 per kw)
of the aggregate input rating of all appliances
installed in that space. Rooms communicating
directly with the space in which the appliances
are installed*, through openings not furnished
with doors, are considered a part of the un-
conned space.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation
grills between them.
DETERMINING FRESH-AIR FLOW
FOR FIREBOX LOCATION


Use this work sheet to determine if you have
a conned or unconned space.
 Includes the room in which you will
install heater plus any adjoining rooms with
doorless passageways or ventilation grills
between the rooms.
WARNING: This heater shall

-


National Fuel Gas Code, ANSI
Z223.1/NFPA 54, the International
Fuel Gas Code,-
-



Today’s homes are built more energy efcient
than ever. New materials, increased insulation
and new construction methods help reduce
heat loss in homes. Home owners weather
strip and caulk around windows and doors to
keep the cold air out and the warm air in. Dur-
ing heating months, home owners want their
homes as airtight as possible.
While it is good to make your home energy
efcient, your home ne eds to breathe. Fresh
air must enter your home. All fuel-burning ap-
pliances need fresh air for proper combustion
and ventilation.
Exhaust fans, replaces, clothes dryers and
fuel burning appliances draw air from the house
to operate. You must provide adequate fresh
air for these appliances. This will insure proper
venting of vented fuel-burning appliances.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Air for
Combustion and Ventilation.
All spaces in homes fall into one of the three
following ventilation classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned Space
The information on pages 8 through 10 will help
you classify your space and provide adequate
ventilation.

The air that leaks around doors and windows
may provide enough fresh air for combustion
and ventilation. However, in buildings of un-
usually tight construction, you must provide
additional fresh air.

www.desatech.com
122274-01F 9
AIR FOR COMBUSTION AND VENTILATION
Continued
1. Determine the volume of the space (length
x width x height).
Length x Width x Height =__________cu. ft.
(volume of space)
Example: Space size 22 ft. (length) x 18 ft.
(width) x 8 ft. (ceiling height) = 3,168 cu. ft.
(volume of space)
If additional ventilation to adjoining room
is supplied with grills or openings, add the
volume of these rooms to the total volume
of the space.
2. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can support.
________ (volume of space) x 20 = (Maxi-
mum Btu/Hr the space can support)
Example: 3,168 cu. ft. (volume of space) x 20 =
63,360 (maximum Btu/Hr space can support)
3. Add the Btu/Hr of all fuel burning appliances
in the space.
Vent-free replace _________ Btu/Hr
Gas water heater* _________ Btu/Hr
Gas furnace _________ Btu/Hr
Vented gas heater _________ Btu/Hr
Gas replace logs _________ Btu/Hr
Other gas appliances* + _________ Btu/Hr
Total = _________ Btu/Hr
* Do not include direct-vent gas appliances.
Direct-vent draws combustion air from the
outdoors and vents to the outdoors.
Example:
Gas water heater _________ Btu/Hr
Vent-free replace + _________ Btu/Hr
Total = _________ Btu/Hr
4. Compare the maximum Btu/Hr the space
can support with the actual amount of Btu/Hr
used.
_______ Btu/Hr (maximum the space can
support)
_______ Btu/Hr (actual amount of Btu/Hr
used)
Example: 63,360 Btu/Hr (maximum the
space can support)
79,000 Btu/Hr (actual amount of
Btu/Hr used)
The space in the example is a conned space
because the actual Btu/Hr used is more than the
maximum Btu/Hr the space can support. You
must provide additional fresh air. Your options
are as follows:
A. Rework worksheet, adding the space of an
adjoining room. If the extra space provides an
unconned space, remove door to adjoining
room or add ventilation grills between rooms.
See Ventilation Air From Inside Building.
B. Vent room directly to the outdoors. See
Ventilation Air From Outdoors, page 10.
C. Install a lower Btu/Hr replace, if lower Btu/
Hr size makes room unconned.
Figure 4 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option
3
V e ntilation Grills
Into Adjoining Room,
Option 2
V e ntilation
Grills Into
Adjoining
Room,
Option 1
12"
12"
If the actual Btu/Hr used is less than the
maximum Btu/Hr the space can support, the
space is an unconned space. You will need
no additional fresh air ventilation.
WARNING:Ifthe areainwhich


-


   National Fuel
Gas Code,ANSI Z223.1/NFPA 54,
the International Fuel Gas Code,

VENTILATION AIR

This fresh air would come from an adjoining
unconned space. When ventilating to an
adjoining unconned space, you must provide
two permanent openings: one within 12" of the
ceiling and one within 12" of the oor on the
wall connecting the two spaces (see options
1 and 2, Figure 4). You can also remove door
into adjoining room (see option 3, Figure 4 ).
Follow the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, Air for Combustion and
Ventilation for required size of ventilation
grills or ducts.
40,000
39,000
79,000

www.desatech.com 122274-01F10
Figure 5 - Ventilation Air from Outdoors
Outlet
Air
V e ntilated
Attic
Outlet
Air
Inlet
Air
Inlet Air V e ntilated
Crawl Space
T o
Crawl
Space
T o Attic
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two perma-
nent openings: one within 12" of the ceiling
and one within 12" of the oor. Connect these
items directly to the outdoors or spaces open
to the outdoors. These spaces include attics
and crawl spaces. Follow the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Air for
Combustion and Ventilation for required size
of ventilation grills or ducts.
IMPORTANT: Do not provide openings for
inlet or outlet air into attic if attic has a thermo-
stat-controlled power vent. Heated air entering
the attic will activate the power vent.
 -


WARNING: Never install

 
 
   
   




 
 


   
    

move heat to wall surfaces next


-
-

    


INSTALLATION
-
-



IMPORTANT: Vent-free gas log heaters add
moisture to the air. Although this is benecial,
installing rebox in rooms without enough
ventilation air may cause mildew to form from
too much moisture. See, page 8.
IMPORTANT: Make sure the rebox is level.
If rebox is not level, log set will not work
properly.
Note: Your rebox is designed to be used in
zero clearance installations. Wall or framing
material can be placed against any exterior
surface on the rear, sides, top or bottom of
your rebox, except where standoff spacers
are integrally attached. If standoff spacers are
attached to your rebox, these spacers can
be placed directly against wall or framing ma-
terials. Use the dimensions shown for rough
opening to create the easiest installation.
Use dimensions shown for rough openings
to create the easiest installation (see Built-In
Firebox Installation, page 12).
AIR FOR COMBUSTION AND VENTILATION
Continued