B-VENT DECORATIVE GAS FIREPLACE
OWNER’S OPERATION AND INSTALLATION MANUAL
MODELS M36(B,H), M42(B,H), VM36(B,H) AND VM42(B,H)
NATURAL GAS
MODELS M36P(B,H), M42P(B,H), VM36P(B,H) AND VM42P(B,H)
PROPANE/LP GAS
WARNING: If the information in these instructions is
not followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
FOR YOUR SAFETY
— Do not store or use gasoline or any other flammable
vapors or liquids in the vicinity of this or any other
appliance.
— WHAT TO DO IF YOU SMELL GAS :
• Do not try to light any appliance.
• Do not touch any electrical switch;
• Do not use any phone in your building.
• Immediatelycallyourgassupplierfromaneighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
— Installation and service must be performed by a quali-
fied installer, service agency or the gas supplier.
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1. This appliance is only for use with the type
of gas indicated on the rating plate. This ap-
pliance is not convertible for use with other
gases unless a certified kit is used.
SAFETY INFORMATION
WARNING: This product
contains and/or generates
chemicals known to the State
of California to cause cancer or
birth defects or other reproduc-
tive harm.
2. Forpropane/LPfireplace, donot place propane/
LP supply tank(s) inside any structure. Locate
propane/LPsupplytank(s)outdoors.Toprevent
performance problems, do not use propane/LP
fuel tank of less than 100 lbs. capacity.
3. If you smell gas
IMPORTANT:Readthisowner’s
manualcarefullyandcompletely
before trying to assemble, op-
erate or service this fireplace.
Improper use of this fireplace
cancauseseriousinjuryordeath
from burns, fire, explosions,
electrical shock and carbon
monoxide poisoning.
•
•
•
shut off gas supply
do not try to light any appliance
do not touch any electrical switch; do not
use any phone in your building
immediately call your gas supplier from a
neighborʼs phone. Follow the gas supplier's
instructions
•
•
ifyoucannotreachyougassupplier, callthe
fire department.
4. Never install the fireplace
•
•
in a recreational vehicle
where curtains, furniture, clothing or other
flammable objects are less than 42" from
the front, top or sides of the fireplace
in high traffic areas
DANGER:Carbonmonoxide
poisoning may lead to death!
•
•
This fireplace is a vented product. This fireplace
will not produce any gas leakage into your home if
properly installed. This fireplace must be properly
installed by a qualified service person. If this unit is
not properly installed by a qualified service person,
gas leakage can occur.
in windy or drafty areas
5. This fireplace reaches high temperatures. Keep
children and adults away from hot surfaces to
avoid burns or clothing ignition. Fireplace will
remain hot for a time after shutdown. Allow
surfaces to cool before touching.
Carbon Monoxide Poisoning: Early signs of
carbon monoxide poisoning resemble the flu, with
headaches, dizziness or nausea. If you have these
signs, the fireplace may not have been installed
properly. Get fresh air at once! Have fireplace
inspected and serviced by a qualified service
person. Some people are more affected by carbon
monoxide than others. These include pregnant
women, people with heart or lung disease or
anemia, those under the influence of alcohol and
those at high altitudes.
6. Carefully supervise young children when they
are in the room with fireplace.
7. A hearth extension is not required with this
appliance. If one is installed, it is for aesthetic
purposes only and does not have to meet the
standard requirements.
8. Turn fireplace off and let cool before servicing
or repairing. Only a qualified service person
should install, service or repair this fireplace.
Have fireplace inspected annually by a quali-
fied service person.
Propane/LP gas and natural gas are both odorless.
An odor-making agent is added to each of these
gases. The odor helps you detect a gas leak. How-
ever, the odor added to these gases can fade. Gas
may be present even though no odor exists.
9. You must keep control compartments, burn-
ers and circulating air passages clean. More
frequent cleaning may be needed due to ex-
cessive lint and dust from carpeting, bedding
material, etc. Turn off the gas valve and pilot
light before cleaning fireplace.
Make certain you read and understand all warnings.
Keep this manual for reference. It is your guide to
safe and proper operation of this fireplace.
10. Have venting system inspected annually by a
qualified service person. If needed, have vent-
ing system cleaned or repaired. See Cleaning
and Maintenance, page 21.
WARNING: Any change to
this fireplace or its controls can
be dangerous.
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Check all items for any shipping damage. If dam-
aged, promptly inform dealer or distributor where
you bought the product.
SAFETY INFORMATION
Continued
11. Keep the area around your fireplace clear of
combustible materials, gasoline and other
flammable vapor and liquids. Do not run fire-
place where these are used or stored. Do not
place items such as clothing or decorations on
or around fireplace.
Safely retain these items for later installation.
INTRODUCTION
Models M36(P)(B,H), VM36(P)(B,H),
M42(P)(B,H) and VM42(P)(B,H) are vented gas
fireplaces that use a millivolt gas control valve with
a millivolt ignition system. A 6" B-Type venting
system and a listed type vent cap are not supplied
but are required for proper operation. See venting
instructions on pages 9 and 10.
12. Do not use this fireplace to cook food or burn
paper or other objects.
13. Do not use any solid fuels (wood, coal, paper,
cardboard, etc.) in this fireplace. Use only the
gas type indicated on fireplace nameplate.
14. This appliance, when installed, must be electri-
cally grounded in accordance with local codes
or, in the absence of local codes, with the
National Electrical Code, ANSI/NFPA 70 or
the Canadian Electrical Code, CSA C22.1.
WARNING: This gas appli-
ance must not be connected to
a chimney flue servicing a solid
fuel burning appliance.
15. Do not obstruct the flow of combustion and
ventilation air in any way. Provide adequate
clearancesaroundairopeningsintothecombus-
tion chamber along with adequate accessibility
clearance for servicing and proper operation.
Models M36(B,H), VM36(B,H), M42(B,H) and
VM42(B,H) are factory equipped for use with
natural gas and must be converted when intended
for use with propane/LP gas. A respective model
PCBM-36 or PCBM-42 conversion kit may be
purchased for simple conversion to propane/LP
gas. See Accessories, page 31.
16. Do not install fireplace directly on carpeting,
vinyl tile or any combustible material other
than wood. The fireplace must set on a metal
or wood panel extending the full width and
depth of the fireplace.
BEFORE YOU BEGIN
Before beginning the installation of your appli-
ance, read these instructions through completely.
17. Do not use fireplace if any part has been ex-
posed to or under water. Immediately call a
qualified service person to arrange for replace-
ment of the unit.
This DESA appliance and its approved compo-
nents are safe when installed according to this
installation manual and are operated as recom-
mended by DESA. Unless you use DESAapproved
components tested for this appliance, YOU MAY
CAUSE A FIRE HAZARD!
18. Do not operate fireplace if any log is broken.
19. Do not use a blower insert, heat exchanger
insert or other accessory not approved for use
with this fireplace.
TheDESAwarrantywillbevoidedbyandDESAdis-
claims any responsibility for the following actions :
20. Provide adequate clearances around air
openings.
A) Modification of the appliance or any of the
components.
UNPACKING
B) Use of any component part not approved by
DESA in combination with this appliance.
The following items are packed inside the firebox.
Remove before positioning firebox into framing.
C) Installation and/or operation in a manner other
than instructed in this manual.
•
•
Transition Collar - For vent connection
Ceramic Log Pack - Shrink-wrapped on card-
board
D) The burning of anything other than the type of
gas approved for use in this gas appliance.
•
•
•
Three (3) plastic bags containing lava rock, pan
and ember materials
Theinstallationmustconformwithlocalcodesor, in
the absence of local codes, with the currentNational
Fuel Gas Code, ANSI Z223.1/NFPA 54 or with the
current CAN/CGA B149 Installation Codes.
Rear Log - Remove the two plastic quick ties
from around the burner and grate
This appliance complies with ANSI Z21.50-2000
and CSA 2.22-2000 as Vented Gas Fireplaces and
is listed and tested by the Canadian Standards
Association to the above test standards.
Grate Stand - Lift off of burner pan
4
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INTRODUCTION
SELECTING LOCATION
Continued
To determine the safest and most efficient location
for your appliance, you must take into consider-
ation the following guidelines:
WARNING: Installation of
this appliance should be done
by a qualified service person
well trained in the installation
of such appliances. You will
alsoneedabuildingpermitfrom
your local Building and Safety
Commissioner before installing
this appliance; otherwise your
insuranceco.maynotcoverthis
appliance.
1. The location must allow for proper clearances
(see Clearances, page 7).
2. Consider a location where heat output would
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.
Figure 1 shows a plan view of a few common
locations.
Flush installations are recommended where
living space is limited or at a premium and since
the space required to enclose the appliance would
be located beyond an outside wall, this would also
reduce the cutting of joists, roof rafters and such.
Check local codes for any restrictions.
NOTICE: This appliance is not
intendedtobeusedasaprimary
source of heat.
Projected installationscan extend any distance
into the room. A projection may be ideal for a new
addition on an existing, finished wall.
CAUTION: Do not connect
appliance before pressure test-
ing gas piping. Damage to gas
valve may result and an unsafe
condition may be caused.
Corner installationsmake use of space that may
not normally be used and provides a wider and
more efficient range for radiant heat transference.
Internal wall installations provide a discreet
option for room separation and can also be ideal
as an addition to an existing wall.
The appliance and itʼs individual shutoff valve
must be disconnected from the gas supply piping
system during any pressure testing of that system at
test pressures in excess of 1/2 psig (3.5 kPa).
CORNER
INSTALLATION
INTERNAL WALL
INSTALLATION
The appliance must be isolated from the gas sup-
ply piping system by closing its individual manual
shutoff valve during any pressure testing of the gas
supply piping system at test pressures equal to or
less than 1/2 psig (3.5 kPa).
FLUSH
INSTALLATION
FULL
PROJECTION
INSTALLATION
For the purpose of input adjustment two pressure
taps (for IN and OUT pressures) are provided on
the gas control valve for test gauge connections
to the appliance.
Figure 1 - Possible Locations for
Installing Appliance
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PRODUCT SPECIFICATIONS
GAS RATING - NATURAL
M36(B,H), VM36(B,H) M42(B,H), VM42(B,H)
40,000 Btu/Hr 45,000 Btu/Hr
3.5 in. WC (.87 kPa) 3.5 in. WC (.87 kPa)
Max. Input Rating:
Manifold Pressure:
Minimum Supply Pressure: 4.5 in. WC (1.12 kPa) 4.5 in. WC (1.12 kPa)
Maximum Supply Pressure: 10.5 in. WC (2.66 kPa) 10.5 in. WC (2.66 kPa)
Orifice Size:
# 30
# 29
GAS RATING - PROPANE/LP
M36P(B,H), VM36P(B,H) M42P(B,H), VM42P(B,H)
Max. Input Rating:
Manifold Pressure:
40,000 Btu/Hr
45,000 Btu/Hr
10 in. WC (2.49 kPa) 10 in. WC (2.49 kPa)
Minimum Supply Pressure: 11 in. WC (2.74 kPa) 11 in. WC (2.74 kPa)
Maximum Supply Pressure: 13 in. WC (3.23 kPa) 13 in. WC (3.23 kPa)
Orifice Size:
# 52
# 50
A
F
For Use With
6"Ø Type B-1
Vent Pipe Only
E
HEARTH AREA
DIMENSIONS
H
Stand Off
Collar
D
7"
B
C
G
Alternate
Gas Supply
Inlet
7"
1.5"
X
Glass Door
(Optional)
13.5"
K
Outside Air
Kit Location
(Optional)
I
O
N
J
S
R
W
T
7"
P
L
V
Q
M
Model 36
Model 42
Model 36 Model 42
Model 36 Model 42
1
1
7
4
4
8
A
B
C
D
E
F
29"
5/8"
41"
36"
I
40 / "
21"
44 / "
24"
9"
42"
49"
40"
Q
R
S
T
U
V
W
X
13 / " 14"
1
1
2
2
5/8"
48"
14"
J
K
L
10 / " 12 / "
1
1
2
2
8"
2 / "
2 / "
3
1
1
4
8
8
12"
34 / "
8 / "
8 / "
1
3
4
4
21 / "
23"
M 42"
36"
11"
12 / "
1
4
1
4
22 / " (24" w/o Brick)
29 / " (31" w/o Brick)
N
7"
2 / "
5"
7"
5
1
1
1
1
8
2
4
4
4
G
H
32 / " (34" w/o Brick)
39 / " (41 / " w/o Brick) O 37"
41"
10 / "
2 / "
3
3
3
3
5
1
1
4
4
4
4
8
2
2
15 / " (16 / " w/o Brick) 17 / " (18 / " w/o Brick)
P
8 / "
4 / "
Figure 2 - Appliance Dimensions
6
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MANTEL CLEARANCES AND WALL
DETAILS
A combustible mantle shelf maybe installed a
maximum 12" (229 mm) from the wall. Figures
5 and 6 show the minimum allowable distances
from various combustible mantle components
in relation to the fireplace opening.
PRE-INSTALLATION
PREPARATION
CLEARANCES
Minimum clearances to combustibles are:
•
•
Back and Sides of Outer Surround. . . 0" min.
Drywall to Sides of Front Face
(Nailing Flanges). . . . . . . . . . . . . . 0" min.
“B” Vent Surfaces. . . . . . . . . . . . . . . . 1" min.
Ceiling to Opening . . . . . . . . . . . . . . 42" min.
Floor . . . . . . . . . . . . . . . . . . . . . . . . . . 0" min.
Perpendicular Wall . . . . . . . . . . .See Figure 6
•
•
•
•
Combustible
Materials
12"
(229mm)
Header
6" (152mm)
CAUTION: Do not block
required air spaces with insu-
lation or any other material. Do
not obstruct effective opening
of appliance with any type of
facing material.
A
Spacer
B
3" (76mm)
1 1
/
2"
(38mm) Max.
2 x 4 Stud
Nailing
Flange
M36(B,H),
M36P(B,H)
VM36(B,H),
VM36P(B,H)
M42(B,H),
M42P(B,H)
VM42(B,H),
VM42P(B,H)
Left Side
Surround
Back
0" Clearance
A
B
14" (356 mm)
8" (203 mm)
15" (381 mm)
9" (229 mm)
0"
Figure 5 - Mantel Clearances - Side View
(Cross Section)
Front Face
Drywall
TOP VIEW
Figure 3 - Minimum Clearances
(Top View)
Outer Surround
Combustible
Material May
Be Used
1" (25mm) Min.
Clearance to
"B" Vent's Outer Pipe
SAFE
ZONE
1 1
Max.
/
2" (38 mm)
Ceiling
3" (76 mm)
Max.
42" (1067mm)
Min. Clearance
from Opening to
Ceiling
Maintain 2" (51mm) Min.
Clearance to the Transition
Pipe as Measured at the
Outer Vent Collar
6" (152 mm)
Max.
A
0" Clearance
Perpendicular
Wall
B
*
Required Air
Spaces are
*
*
*
Indicated with
M36(B,H),
M42(B,H),
an " ". Do Not
*
M36P(B,H)
VM36(B,H),
VM36P(B,H)
M42P(B,H)
VM42(B,H),
VM42P(B,H)
Pack with
Insulation or Any
Other Material
DO NOT BLOCK
OR OBSTRUCT
OPENINGS
0" Clearance to
Combustible or
Noncombustible
Flooring
A
9" (229 mm)
6" (152 mm)
9" (229 mm)
B
12" (305 mm)
Figure 6 - Side Clearances - Top View
(Cross Section)
Figure 4 - Minimum Clearances
(Front View)
108795-01N
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PRE-INSTALLATION
PREPARATION
Continued
FRAMING
1. Frame appliance enclosure as illustrated in
Figures 7 and 8.
A
Note: If a wall covering is used to line the
enclosure, then all measurements must be
from the surface of the covering.
B
C
2. Place the appliance into the framing and
secure it.
M36(B,H),
M36P(B,H)
VM36(B,H),
VM36P(B,H)
M42(B,H),
M42P(B,H)
VM42(B,H),
VM42P(B,H)
Note: If appliance is to be raised above floor
level, a platform must be built to support the
appliance.
3. Install the supply line to the appliance using a
5
3
8
3
8
A
B
C
40 / " (1020 mm) 44 / " (1121 mm)
16
1/2" NPT black iron gas line terminating 2 / "
3
1
8
8
21 / " (543 mm) 23 / " (587 mm)
above the bottom of the appliance. The gas line
must be installed through the lower left side ac-
cess point or alternate access hole in the bottom
of the appliance (see Figure 19, page 13).
1
1
4
4
41 / " (1048 mm) 48 / " (1226 mm)
Figure 7 - Rough Opening for Installing
in Wall
4. Repack insulation around the gas line to cover
any remaining openings in the conduit sleeve.
Prepare the incoming gas line with teflon tape
or pipe joint compound and hook-up incoming
gas line to the flexible gas line.
These Dimensions Allow for a 3/4"
Clearance at Sides and Back of Fireplace.
However, 0" Clearance is Permitted
Note: If 1/2" NPT black iron pipe does not
mate with fitting at the end of flexible gas line,
remove fitting and replace with a 37 degree
flare 3/4"-12, 1/2" NPT (female) fitting.
D
C
A
WARNING: When finishing
appliance, do not overlap com-
bustible material onto the black
frontface.Brick,tileorothernon-
combustible materials may be
applied to the face provided that
any gap is between the material
usedandthefaceiscaulkedwith
a noncombustible caulking.
B
3/4" Clearance Not Required at
Nailing Flanges
M36(B,H),
M36P(B,H)
VM36(B,H),
VM36P(B,H)
M42(B,H),
M42P(B,H)
VM42(B,H),
VM42P(B,H)
1
9
2
16
A
B
C
24 / "
27 / "
(622.3 mm)
(700.1 mm)
7
7
8
8
73 / "
83 / "
(1876.4 mm)
(2130.4 mm)
3
5
16
16
52 / "
59 / "
(1326 mm)
(1506.6 mm)
1
1
4
2
D
17 / "
19 / "
(438.2 mm)
(495.3 mm)
Figure 8 - Corner Installation Guidelines
8
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This appliance may be vented through a manufac-
tured chimney system or a masonry chimney using
a B-vent adapter or a chimney liner system if all
are listed, inspected and approved by local codes
and/or building authorities.
PRE-INSTALLATION
PREPARATION
Continued
INSTALLING TRANSITION PIPE AND
STARTER COLLAR
The examples shown in Figure 10, page 10 are
typical of most B-vent installations and codes
practices.
The transition pipe and starter collar shown in
Figure 9 are supplied with the fireplace, unattached
and ready for installation. Remove the starter collar
and set aside. Slide the transition pipe over the vent
collar and attach with a minimum of three screws.
Replace the starter collar over the transition pipe
and attach using four screws located on the leg
stands (five used on the model M42). To install
B-vent piping, slide the first piece of B-vent over
the transition pipe and attach with either a mini-
mum of two screws or other means approved by
the vent manufacturer.
Example 1: Shows the minimum allowable sys-
tem height and lateral offset for a 60° degree or
greater inclination. Code specifies that offsets at
60° degrees or greater are considered horizontal
and must follow the 75% percent rule for lateral
to total vertical system height. Codes also allows
only one offset in the total system when at 60°
degrees or greater. The total vertical height in this
example represents the minimum height of 8 feet
and therefore the allowable lateral is 6 feet when
the 75% percent rule applies. If the lateral length
must exceed 75% then the system must be sized in
accordance with the Category I venting tables.
B-Vent Piping
Starter Collar
Example 2: Shows a multiple offset each at 45°
degrees of inclination. Multiple offsets are permit-
ted if they do not exceed 45° degrees of inclination.
The total lengths of the two offsets are not required
to meet the 75% percent allowable rule.
Transition Pipe
Vent Collar
Example 3: Shows a single offset at 45° degrees
of inclination and therefore the lateral length at
10 feet of offset does not have to meet the 75%
percent rule.
In each case the offsets must be supported and
firestops must be positioned wherever the vent
must pass through a sub-floor, ceiling joist or
an attic overhang. The vent pipe must terminate
vertically into a listed type vent cap and extend a
sufficient height through an approved roof flash-
ing, roof jack or a roof thimble. At all points the
listed clearances must be maintained.
Figure 9 - Installing Transition Pipe and
Starter Collar
VENTING INSTALLATION
A B-type venting system must be connected to the
appliance for venting to the outside of the building.
Vent terminations must be located in accordance
with height and proximity rules of NFPANo. 54 or
CAN/CGAB149. These rules apply to vents at 12
in. diameter or less and require a minimum height
in accordance with the roof pitch and a minimum
of 8 ft. distance from a vertical wall or obstruction
(see Figure 11, page 10).
The following section is provided as a guide to a
standard B-type vent installation.
Standing codes requirements concerning B-type
vent installations may vary within your state,
province or local codes jurisdiction. Therefore,
it is recommended that you check with your
local building codes for specific requirements
or in absence of local codes, follow Section 7.0
of the current National Fuel Gas Code ANSI
Z223.1/NFPA 54 and in Canada with CAN/CGA
B149 for Category I systems using double wall
B-1 vent pipe.
If venting horizontally through a side wall be-
comes necessary, a listed thimble approved for use
with B-type vent must be used. Check with your
local codes before venting through a side wall.
Some codes areas allow the use of existing B-type
vent systems if the system is at or above the recom-
mended diameter of the flue; in this case 6".
This gas appliance must be vented to the outdoors
only and may not be terminated into an attic space
or into a chimney flue servicing a solid-fuel burn-
ing appliance.
The flue connection must be made using listed
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VENTING INSTALLATION
Continued
Listed
Vent Cap
Listed
Vent Cap
Listed
Vent Cap
Maintain
Listed
Maintain
Listed
Maintain
Listed
Clearance
Maintain
Clearance
Clearance
Listed
Support Each
Lateral At
Least Every
Six (6) Feet
Clearance
45
45
60
12' Min.
8'
45
10'
6'
Position
Firestop
12' Min.
12' Min.
Position
Firestop
Position
Firestop
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Maintain
Listed
Clearance
EXAMPLE 1
EXAMPLE 2
EXAMPLE 3
Figure 10 - Typical B-Vent Configuration
B-type connectors and the existing system must be
code inspected for damage and proper installation.
Lowest
Discharge
Opening
Listed
Vent Cap
It is not recommended that this appliance be com-
mon vented with an existing gas burning appliance.
However, if it becomes necessary to common vent
this appliance, the venting system must be sized
and configured in accordance with the common
venting guidesAppendix G of the current National
Fuel Gas Code ANSI Z223.1/NFPA 54 and in
Canada with CAN/CGA B149.
8 Ft. Min.
Listed Gas
Vent
x
12
Roof Pitch x/12
Listed Clearance
H (Min)
Height
From Roof
H (Min.)
Note: Before connecting this appliance to an
existing vent system or a common venting sys-
tem consult with your local architect, planner or
building official.
Roof Pitch
Flat to 6/12
Ft.
1.0
1.25
1.5
2.0
2.5
3.25
4.0
5.0
6.0
7.0
7.5
8.0
m
ax0.30
0.38
0.46
0.61
0.76
0.99
1.22
1.52
1.83
2.13
2.27
2.44
6/12 to 7/12
Over 7/12 to 8/12
Over 8/12 to 9/12
Over 9/12 to 10/12
WARNING: This appliance
must be properly connected
to a system and must not be
connected to a chimney flue
servicing a separate solid fuel
burning appliance.
Over 10/12 to 11/12
Over 11/12 to 12/12
Over 12/12 to 14/12
Over 14/12 to 16/12
Over 16/12 to 18/12
Over 18/12 to 20/12
Over 20/12 to 21/12
Figure 11 - B-Vent Terminations
10
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VENTING INSTALLATION
INSTALLATION
WALL SWITCH INSTALLATION
Continued
CHECKING FOR PROPER VENTING
The installation of a wall switch allows you to
activate the gas control valve without the normal
household electricity since the valve operates on
millivolt current supplied by the heat generated by
the thermopile. To install the wall switch:
After completing and checking the electrical,
gas and vent connections, follow the lighting
instructions and allow the main burner to run for
approximately 5 minutes. Hold a lighted match or
cigarette near the top edge of the fireplace opening
and play it along the entire length of the opening
(see Figure 12). Proper venting should tend to draw
the flame or smoke into the appliance. Improper
venting or escaping of spillage of burned gas, is
indicated when the match flickers or goes out.
Smoke from a cigarette will also tend to disperse
away from the appliance.
1. Remove the front refractory access panel by
lifting up and angling out of the firebox open-
ing (see Figure 13).
2. Use wire and connectors provided. Attach red
wire to terminal marked TH/TP on control
valve. Attach white wire to blade connector on
open end of safety circuit wiring (see Wiring
Diagram, page 22).
If the appliance is found to be improperly venting,
shut it off and notify your installer or a qualified
service agency to inspect the venting system.
Note: If any of the original wire from the unit
control must be replaced, use the same type or a
higher rated wire (25 ft. maximum length).
NOTICE: This appliance is
equippedwithaventsafetyshutoff
switch which will shut down the
appliance in the case of a venting
problem. Do not bypass the vent
safety switch. If the appliance
shouldshutdown,contactaquali-
fied installer, service agency or
yourgassuppliertohavethevent
inspected before operating.
WARNING: Do not wire re-
mote wall switch to main power
supply (Standard 120v house-
hold current).
3. Locate wall switch in a convenient location.
4. After wire connections are complete, replace
refractory access panel.
Check this area along
the entire top edge of
the fireplace opening.
Smoke or flame should
be drawn into the
appliance opening.
Figure 13 - Removing Front Refractory
Access Panel
Figure 12 - Checking for Spillage
108795-01N
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Receiver
INSTALLATION
Continued
OPTIONAL WIRELESS HAND-HELD
REMOTE CONTROL INSTALLATION
Note: If using optional wireless hand-held remote
control, the wall switch is no longer operational.
Plastic
Mounting
Clips
Installing Receiver
1. Remove the front refractory access panel by
liftingupandanglingout ofthe firebox opening
(see Figure 13, page 11) to expose controls.
Mounting Bracket
Figure 15 - Installing Remote Receiver
(Shown from Rear of Mounting Bracket)
2. Disconnect wall switch wires from TH
and TH/TP terminals on control valve (see
Figure 14).
9-Volt Battery
3. Install remote receiver unit onto mounting
bracket using the two plastic mounting clips
(see Figure 15).
Battery
Clip
4. Connect wires to control circuit. Connect
white wire to terminal marked TH/TP on
control valve. Connect red wire to male blade
connector provided at open end of safety cir-
cuit wiring (see Wiring Diagram, page 22).
Terminal
Wires
5. Locate the battery clip mounted on the back
of the receiver (see Figure 16).
Receiver
6. Slide 9-volt battery (not included) through the
clip. Note: Only use alkaline battery.
Figure 16 - Installing Battery in Receiver
7. Attach the terminal wires to the battery (see
Figure 16).
8. Replace refractory brick access panel.
Wall Switch
(Supplied)
Route Millivolt
To Safety Circuit
Wires (Supplied)
Through Gas Line
Conduit Sleeve
To Thermopile
N
O
T
O
I
P
F
F
IN
OUT
(Back View
Note: If any of the original wire as supplied must
be replaced, use 18 AWG TYPE CL2 (UL) 105 C
(25 ft. length MAXIMUM) or equivalent.
Figure 14 - Wall Switch Wiring Diagram
12
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DESA recommends that a black iron gas line be
routed from the gas source, through a sediment
trap (shown in Figure 20) and into the appliance.
Once connected through the appliance, a flexible
gas line may be used for ease of installation to gas
control valve (see Figure 21, page 14).
INSTALLATION
Continued
Installing 9-Volt Battery in Hand-Held
Remote Control Unit
1. Remove battery cover on back of remote
control unit.
Before connecting the black iron gas line to the
inside of the appliance a sediment trap must be
included outside the appliance between the gas
line and the gas shutoff valve. It must extend
down three (3) inches beyond the center of the
pipe. Prepare incoming black iron gas line with
teflon tape or pipe joint compound (Check with
local building codes).
2. Attach terminal wires to the battery (not in-
cluded). Place battery into the battery housing.
Note: Only use alkaline battery.
3. Replace battery cover onto remote control
unit.
Remote
Battery Cover
Control Unit
Shutoff
Valve
Key
Terminal
Wires
Battery
Housing
Extension
9-Volt
Battery
Typical Exterior Wall Gas
Shutoff Installation
Figure 17 - Installing Battery in Hand-
Held Remote Control Unit
Figure 18 - Manual Shutoff Valve
Installation
GAS LINE HOOK-UP
1/2" NPT Incoming
Black Iron Gas Line
WARNING: Gas line hookup
should be done by your gas
supplier or a qualified service
person.
A
7"
7"
Alternate Gas Supply
Through Sub-Floor
M36(B,H),
M36P(B,H
VM36(B,H),
VM36P(B,H)
M42(B,H),
M42P(B,H)
VM42(B,H),
VM42P(B,H)
WARNING: Before you pro-
ceed,makesureyourgassupply
is OFF.
5
1
A manual shutoff valve has been included in the
applianceʼs gas supply system. You may consider
installing an extra gas shutoff valve outside the
applianceʼs enclosure (check with local codes)
where it can be accessed more conveniently with
a key through a wall as shown in Figure 18.
8
2
A
8 / " (219 mm)
10 / " (267 mm)
Figure 19 - Routing Incoming Gas Line
Incoming
1/2" Gas Line
Permitted by
In conformance with local codes, route a 1/2" NPT
gas line to the appliance through hole in left side of
firebox or sub-floor as shown in Figure 19.
Local Codes
Sediment
Trap (Not
Supplied)
3" Min.
(76mm)
CAUTION: Do not kink flex-
ible gas line.
Figure 20 - Sediment Trap
108795-01N
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EMBER AND PAN MATERIAL
PLACEMENT
INSTALLATION
Continued
1. Open the bag(s) of vermiculite and fill the
entire burner pan until the burner tube is
completely covered (see Figure 22).
CAUTION:Compoundsused
on threaded joints of gas piping
shall be resistant to the action
of Liquefied Petroleum (LP or
propane) and should be applied
lightly to ensure excess sealant
does not enter the gas line.
2. Smooth the pan material just even with edges
of the burner pan.
3. Remove the ember material from the bag and
flatten small amounts into quarter size pieces
and lay on top of the surface of the pan mate-
rial (see Figure 23).
4. Place just enough to cover the entire surface
and leave about a 1/2 inch gap under the
lower grate members to allow air to flow (see
Figure 24, page 15).
WARNING: All gas piping
andconnectionsmustbetested
for leaks after the installation is
completed.
Vermiculite
(Pan Material)
Grate
Burner Pan
Afterensuringthatthegasvalve
is on, apply a commercial leak
detection solution to all con-
nections and joints. If bubbles
appear, leaks can be detected
and corrected.
Donotuseanopenflameforleak
testing and do not operate any
appliance if a leak is detected.
Figure 22 - Fill Entire Burner Pan with
Vermiculite
Vermiculite (Pan Material)
Ember Material
Grate
Burner
Pan
Complete your gas installation by connecting
incoming gas line with flexible gas line. Secure
tightly with wrench but DO NOT OVER-
TIGHTEN.
Figure 23 - Ember Material on Surface of
Pan Material (Vermiculite)
Red Surface Indicates For
Propane/LP Use Only
Flexible Gas Line
Do NOT Kink
Gas Shutoff
Valve
Pilot Adj
ON
T
P
OFF
Note:
1) Wire Connections
IN
OUT
Not Shown for Clarity
2) * 1/8" NPT Plugged
Tapping
1/2" NPT
Incoming
Gas Line
Outlet
Pressure Tap
Inlet Pressure Tap
Figure 21 - Connecting Flexible Gas Line to Millivolt Valve
14
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INSTALLATION
NOTICE: Do not put lava rock
inside the burner pan or around
theairmixerfitting. Placinglava
rock inside the burner pan or
blockingtheopeningsofthepro-
pane/LP air-mixer could cause
performance problems.
Continued
Grate
Pan and Ember
Material
0.5"
Log 4
0.5"
Burner Pan
Log 3
Log 2
Figure 24 - Pan and Ember Material
Clearances
Notches
LOG PLACEMENT FOR M36, M36P,
VM36 AND VM36P MODELS
1. Place small front right log (log 1) on right front
of grate as shown in Figure 25.
2. Place large back log (log 2) onto grate mak-
ing sure notches rest over grate as shown
in Figure 25.
Log 1
3. Place log 3 into notch on log 2, resting the
front end on top of log 1 (see Figure 26).
Figure 26 - Installing Logs 3 and 4
4. Place the upper end of log 4 into the notch on
log 2 as shown in Figure 26. Rest the lower
end of log 4 onto the middle grate finger as
shown in Figure 27.
Log 5
Notch
Log 6
5. Place the upper end of log 5 into notch on the
left of log 2 (see Figure 27). Rest the lower end
of log 5 on the grate as shown in Figure 28.
Log 4
6. Insertthelowerendoflog6betweenthefirsttwo
grate fingers as shown in Figure 28 and position
the upper end of log 6 into the notched area on
the front of log 2 as shown in Figure 28.
Notch
As an option to enhance the look of the hearth,
you may place the lava rock provided around the
front and sides of the burner.
Figure 27 - Installing Logs 5 and 6
Log 2
Notch
Log 1
Figure 28 - Logs Installed for M36, M36P,
VM36 and VM36P Models
Figure 25 - Installing Logs 1 and 2
108795-01N
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5. Place the upper end of log 5 into the notch on
the top inner right of log 1 (see Figure 31).
Rest the lower end of log 5 on the middle grate
finger as shown in Figure 32.
INSTALLATION
Continued
LOG PLACEMENT FOR M42, M42P,
VM42 AND VM42P MODELS
1. Place large back log (log 1) onto grate making
sure notches rest over grate (see Figure 29).
6. Place log 6 into the notch on the top right of log
1 (see Figure 31). Rest the lower end of log 6
on top of log 2B (see Figure 32).
As an option to enhance the look of the hearth,
you may place the lava rock provided around the
front and sides of the burner pan.
2. Insert lower end of log 2Abetween the first two
grate fingers and position the upper end into
the notch on the front of log 1. See Figure 29.
Place log 2B on the front right side of grate as
shown in Figure 29.
NOTICE: Do not put lava rock
inside the burner pan or around
the air mixer fitting. Placing lava
rock inside the burner pan or
blocking the openings of the
propane/LPair-mixercouldcause
performance problems.
3. Place log 3 into notch on top left of log 1, rest-
ing the lower end on the left two grate fingers
(see Figure 30).
4. Place the upper end of log 4 into the notch on
log 1 as shown in Figure 30. Rest the lower
end of log 4 on the middle grate finger as
shown in Figure 31.
Notch
Log 1
Log 5
Log 6
Log 2A
Log 1
Log 2B
Notch
Log 2B
Figure 31 - Installing Logs 5 and 6
Figure 29 - Installing Logs 1, 2A and 2B
Log 3
Log 4
Log 1
Notches
Figure 32 - Logs Installed for M42, M42P,
VM42 and VM42P Models
Figure 30 - Installing Logs 3 and 4
16
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INSTALLING OPTIONAL GLASS
DOOR ACCESSORY
INSTALLATION
Continued
COMBUSTION AIR KIT MODEL AK4
(OPTIONAL)
CAUTION: Use only glass
doors certified for use with this
appliance.
The outside air kit may be installed on the left side
of the fireplace only. The vent can be installed
through any outside wall a minimum of three feet
below fireplace termination cap. The handle to
operate the damper door for the outside air inlet
will be located inside the left “screen pocket” of
the firebox (see Figure 33). Pull the handle to open
or push to close.
Note: Glass door may be heavy for some individu-
als. If this is the case, please request help from
someone else.
The M36, VM36, M42 and VM42 B-vent fire-
places are approved for use with optional bi-fold
glass doors (see Accessories, page 31). The glass
panels may be ordered and installed anytime after
the fireplace installation is complete.
CAUTION:Air inlet ducts are
not to terminate in attic space.
Follow these steps to install left and right panels:
1. With the handle at the bottom, completely fold
the panel on its hinges.
Screen
Pocket
2. With the handle facing the center of the firebox
opening, insert the lower pivot pin on the glass
door panel into the hole in pivot plate on the
bottom edge of the fireplace opening (see
Figure 35).
Air Kit
Handle
3. Keeping the folded door tilted, slide the upper
two pins into the guide track found under the
upper facial edge of the firebox opening.
4. Tilt the glass assembly fully vertical until the
outer pivot pin snaps into the mounting hole
in the upper spring clip (see Figure 35).
5. Once the top and bottom pins are secured,
unfold the door into the closed position.
Figure 33 - Air Kit Handle Location
APPLIANCE ENCLOSURE
Insert Pin Into
Spring Clip
Before finishing the enclosure around the appli-
ance, inspect all joints around the outer surround.
Any gaps between the nailing flanges and the
framing should be sealed with noncombustible
insulation or caulking.
Spring Clip
Slide Top
Pin Into
Door Track
If the appliance is mounted on a raised platform,
it must be a continuous surface and not on blocks
without a solid surface. This will prevent the entry
of cold air by means of conduction through the
total bottom of the appliance (see Figure 34).
Insert Bottom Pivot Pin Into
Pivot Plate and Swing Door
Into Vertical Position
Side
Framing
Side
Framing
Pack Insulation
Caulk Here
Pivot Plate
Figure 34 - Sealing Between Appliance
and Framing
Figure 35 - Installing Optional Glass
Door
108795-01N
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Fold Bi-Fold
Door After
Releasing
Spring Clip
and Slide
Spring Clip
INSTALLATION
Continued
6. Repeat the process for the opposite door
assembly.
Door Out of
Upper Track
7. To adjust the doors, slide them partially open.
Using a screwdriver, loosen the hold-down
screws in the spring clip (see Figure 36) and
pivot plate.
Depress
Spring Clip
to Release
Pivot Pin
8. Close both doors until evenly joined at the
middle and note the gap at the outer edges of
the face.
9. Reopen one door at a time and retighten the
upper and lower hold-down screws.
10. Repeat the process until both doors are evenly
joined, spaced and working freely.
Remove Bottom Pin
From Pivot Plate While
Sliding Door Out of the
Upper Track
Pivot Plate
CAUTION: The glass pan-
els become very hot while the
appliance is operating. Do not
attempt to adjust or clean the
glass doors until the appliance
has fully cooled.
Figure 37 - Removing Glass Doors
OPENING VENT DAMPER
Vent damper must be locked in the full open posi-
tion before operating the fireplace. If vent damper
The doors may be removed for replacement or is not open, fireplace will not light.
cleaning as follows:
1. Partially open the door and press up on the
upper spring clip with a screw driver until the
outer top pivot pin is free of the clip.
2. Fully fold the frame assembly and slide the
upper edge towards the center of the firebox
opening until the guide pins are free of the
frame rail (see Figure 37).
VENT DAMPER MUST BE LOCKED
IN THE FULL OPEN POSITION
TO OPERATE THE APPLIANCE
OPEN
CLOSE
CAUTION: Always operate
the appliance with the doors ei-
therfullyopenedorfullyclosed.
Operating the appliance with
the doors partially open can re-
sult in improper venting of flue
products.
Figure 38 - Opening Vent Damper
Spring
Clip
Hold-Down
Screw
Side
Front
Face
Partially
Opened
Door
Figure 36 - Adjusting Glass Doors
18
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1. STOP! Read the safety information,
column 1.
OPERATING FIREPLACE
FOR YOUR SAFETY
READ BEFORE LIGHTING
2. Turn wall switch to the OFF position.
3. Turn off all electric power to the appliance.
4. Fully open glass doors if installed.
WARNING: If you do not fol-
low these instructions exactly,
a fire or explosion may result
causing property damage, per-
sonal injury or loss of life.
5. Remove front refractory brick access panel.
6. Turn gas control knob clockwise
to the OFF position (see Figure 39).
7. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor.
If you smell gas, STOP! Follow “B” in the
safety information above. If you donʼt smell
gas, go to the next step.
A. This appliance has a pilot which must be
lighted by hand. When lighting the pilot,
follow these instructions exactly.
8. Turncontrolknobcounterclockwise
to the PILOT position.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.
9. Push in the knob all the way and hold in.
Immediately light the pilot manually. Con-
tinue to hold the control knob in for about
(1) minute after the pilot is lit. Release knob
and it will pop back up. Pilot should remain
lit. If it goes out, repeat steps 5 through 9.
WHAT TO DO IF YOU SMELL GAS
•
•
Do not try to light any appliance.
Do not touch any electric switch; do not
use any phone in your building.
Immediately call your gas supplier
from a neighborʼs phone. Follow the
gas supplierʼs instructions.
•
If knob does not pop up when released,
stop and immediately call your service
technician or gas supplier.
•
•
•
If the pilot will not stay lit after sev-
eral tries, turn the gas control knob to
“OFF” and call your service technician
or gas supplier.
If you cannot reach your gas supplier,
call the fire department.
C. Use only your hand to push in or turn the
gas control knob. Never use tools. If the
knob will not push in or turn by hand, donʼt
try to repair it, call a qualified service tech-
nician or gas supplier. Force or attempted
repair may result in a fire or explosion.
10. Turn gas control knob counterclockwise
to “ON”. Knob can be turned to
“ON” only if the control knob is popped out.
11. Replace front refractory brick access panel.
12. Fully close glass doors if installed.
D. Do not use this appliance if any part has
been under water. Immediately call a
qualified service technician to inspect the
appliance and to replace any part of the
control system and any gas control which
has been under water.
13. Turn on all electric power to the appliance.
Pilot Adjustment
Gas Control
Screw
Knob
ON
LIGHTING
T
I
P
INSTRUCTIONS
OFF
NOTICE:Duringinitialoperation
of new heater, burning logs will
give off a paper-burning smell.
Orange flame will also be pres-
ent. Open damper or window to
vent smell. This will only last a
few hours.
IN
OUT
Position
Indicator
Figure 39 - Control Knob in the PILOT
position
108795-01N
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3. To Lock press both buttons on remote
control until light stops flashing. Remote is
now locked. If the fire is on it will be turned
off automatically. In the locked state, the
light will not light up when any button is
pressed.
OPERATING FIREPLACE
Continued
TO TURN OFF GAS
TO APPLIANCE
1. Turn off the wall switch.
4. To Unlock press both buttons together on
remote control until light stops flashing.
The remote is now unlocked.
2. Turn off all electric power to the appliance
if service is to be performed.
3. Fully open glass doors if installed.
Indicator
Light
4. Remove front hearth brick and control
access panel.
5. Turn gas control knob clockwise
to “OFF”. Do not force.
6. Replace front refractory brick access
panel.
Control
Button
7. Fully close glass doors if installed.
Pilot
Burner
Thermopile
Ignitor
Figure 41 - On/Off Hand-Held Remote
Control Unit HRC100
INSPECTING BURNERS
Check pilot flame pattern and burner flame pat-
terns often.
Figure 40 - Pilot
PILOT ASSEMBLY
OPTIONAL HAND-HELD
REMOTE OPERATION
Note: The receiver and hand-held remote
control kit must be purchased separately (see
Accessories, page 31). Follow installation in-
structions on page 10 of this manual.
The pilot assembly is factory preset for the proper
flame height. Alterations may have occurred dur-
ing shipping and handling. The pilot is located on
the back right hand side of the burner.
The height of the thermopile must be 3/8" to 1/2"
above the pilot flame. The flame from the pilot
burner must extend beyond the thermopile.
1. After lighting, let pilot flame burn for
about one minute. Turn control knob to
ON position. Slide the selector switch to
the REMOTE position. Note: The burner
may light if hand-held remote was on when
selector switch was last turned off. You can
now turn the burner on and off with the
hand-held remote control unit.
If your pilot assembly does not meet these re-
quirements:
•
Turn the adjustment screw marked pilot
clockwise to decrease or counterclockwise to
increase the flame to proper size (see Figure
39, page 19). Do not remove the adjustment
screw.
IMPORTANT: Do not leave the selector
switch in the REMOTE or ON position
when the pilot is not lit. This will drain the
battery.
•
see Troubleshooting, page 19
2. Press the control button on the hand-held
remote to turn the burner on. Press the
control button again to turn burner off (see
Figure 41).
20
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INSPECTING BURNERS
CLEANING AND
MAINTENANCE
Continued
Thermopile
WARNING: Installation and
repairshouldbedonebyaquali-
fied service person. The appli-
anceshouldbeinspectedbefore
each use and at least annually
by a qualified service person.
More frequent cleaning may be
required due to excessive lint
from carpeting, bedding mate-
rial, pet hair, etc. It is imperative
that the control compartments,
burners and circulating air sys-
tem be kept clean.
Pilot
Burner
Ignitor
Figure 42 - Correct Pilot Flame Pattern
BURNER FLAME PATTERN
Burner flames will be steady; not lifting or floating.
Flames should go up through the middle of logset.
Flames should not "spill" to the edges of the pan
or sides of the logset.
WARNING: The logs can be
hot. Handle only when cool.
Figure 43 shows a typical flame pattern. If burner
flame pattern differs from that described:
WARNING: Turn off gas and
electricalpowerbeforeservicing
appliance.
•
turn appliance off (see To Turn Off Gas to Ap-
pliance, page 20)
•
see Troubleshooting, page 23
WARNING: Failure to keep
the primary air opening(s) of
theburner(s)cleanmayresultin
sooting and property damage.
PILOT AND BURNER
•
Remove logs and ember material before
cleaning burner and replace when cleaning is
complete.
•
•
Burner and controls should be cleaned with
compressed air to remove dust, dirt or lint.
Figure 43 - Typical Flame Pattern
Use a vacuum cleaner or small, soft bristled
brush to remove excess dust, dirt or lint.
LOGS
•
If you remove logs for cleaning, refer to log
placement information on page 12 to properly
replace logs.
•
•
•
Use a vacuum cleaner to remove any carbon
buildup on logs.
Replace log(s) if broken. See Replacement
Parts, page 22.
Replace ember material periodically as needed.
See Replacement Parts, page 22.
108795-01N
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WIRING DIAGRAM
PILOT
BURNER
THERMOPILE
REPLACE FACTORY WIRING WITH 105°C
EQUIVALENT OR HIGHER RATING
IGNITOR
EXTERNAL WIRING USE ONLY CLASS 2
THERMOSTAT WIRE 18 GA. RED/WHITE
PILOT GAS
LINE
DO NOT
CONNECT
TO 120V
RED
WHITE
N.O. SW
N.C.SW
TH
F
TP
MANUAL
DAMPER
SWITCH
TH/TP
INCOMING
MAIN GAS
SUPPLY
(VENT SAFETY
SHUTOFF SWITCH)
PILOT SAFETY WIRE
WALL SWITCH
(SUPPLIED)
SERVICE HINTS
REPLACEMENT PARTS
Note: Use only original replacement parts.Thiswill
protect your warranty coverage for parts replaced
under warranty.
When Gas Pressure Is Too Low
•
•
•
•
pilot will not stay lit
burner will have delayed ignition
fireplace will not produce specified heat
PARTS UNDER WARRANTY
propane/LP gas supply may be low if using Contact authorized dealers of this product. If
propane/LP gas
they canʼt supply original replacement part(s)
call DESAʼs Technical Service Department at
1-866-672-6040 for referral information.
If using propane/LP gas, you may feel your gas
pressure is too low. If so, contact your local pro-
pane/LP gas supplier.
When calling DESA, have ready
•
•
•
•
•
•
your name
TECHNICAL SERVICE
your address
You may have further questions about installation,
operation or troubleshooting. If so, contact DESAʼs
Technical Service Department at 1-866-672-6040.
When calling please have your model and serial
numbers of your heater ready.
model and serial numbers of your fireplace
how fireplace was malfunctioning
type of gas used (propane/LP or natural gas)
purchase date
Usually, we will ask you to return the part to the
factory.
You can also visit DESAʼs Technical Services web
PARTS NOT UNDER WARRANTY
Contact authorized dealers of this product. If
they canʼt supply original replacement part(s)
call DESA at 1-866-672-6040 for referral infor-
mation.
When calling DESA, have ready
•
•
model number of your fireplace
the replacement part number
22
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TROUBLESHOOTING
Note: Before troubleshooting the system, make sure the gas shutoff valve is ON. The two most common
causes of a malfunctioning gas appliance are:
1. Loose wiring connections
2. Construction debris clogging the pilot and/or gas control valve filter
OBSERVED PROBLEM
POSSIBLE CAUSE
REMEDY
Pilot will not light
1. No gas supply or shutoff 1. Check to see if you have gas
supply
valve is OFF
2. Air in gas line
2. Hold regulator control valve
in the PILOT position for 2 to
3 minutes to purge air. If you
smell gas stop and wait for a
few minutes before trying to
light the fireplace
3. Construction debris clog- 3. Remove debris and dirt, in-
ging pilot orifice
spect and clean any other
possible obstructions
4. Contact your gas supplier
4. Low gas pressure
5. Control valve knob is not on 5. Refer to section on pilot
the PILOT position
6. Kinked pilot line
lighting
6. Have a qualified technician
replace pilot line
7. Bad valve
7. Replace regulator valve (see
Accessories, page 31)
8. Vent damper not fully open 8. Open vent damper until fully
locked in OPEN position
Pilot will not stay lit
1. Loose wiring on thermopile 1. Check wiring connections.
to regulator valve. No mil-
livolt current is being sent
back to regulator
Refer to wiring diagram
shown in Wall Switch Instal-
lation, page 11
2. If valve knob and wall switch 2. Have a qualified technician
are in the ON position, proba-
ble defective regulator valve
replace valve
3. Vent damper not fully open 3. Open vent damper until fully
locked in OPEN position
No gas to burner, although wall 1. Wall switch wires defective or 1. Check electrical connections
switch and valve are set to the
ON position
too long
2. Thermopile not generating 2. See Pilot will not stay lit,
sufficient voltage
above
Frequent pilot outage
1. Pilot flame may be too 1. Clean and adjust pilot flame
low, causing safety pilot to
“drop out”
for maximum flame impinge-
ment on thermopile
2. Improperventingorexcessive 2. Have the vent system inspect-
blockage
ed, including the termination
cap. Remove any restriction
or obstruction
108795-01N
23
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TROUBLESHOOTING
Continued
OBSERVED PROBLEM
POSSIBLE CAUSE
REMEDY
Pilot goes out when wall switch 1. Millivolt output on thermo- 1. Replace thermopile
is ON pile too high
Spark ignitor will not light pilot 1. Defective ignitor (no spark at 1. Check for spark at the elec-
after repeated triggering of red
button
electrode)
trode and pilot; if no spark
and electrode wire is properly
connected, replace ignitor
2. Defective pilot or misaligned 2. Using a match, light pilot. If
electrode at pilot (spark at
electrode)
pilot lights, turn off pilot and
trigger the red button again.
If pilot lights, an improper
gas/air mixture caused the
improper lighting and a longer
purge period is recommended.
If pilot will not light, check
gap at electrode and pilot. Gap
should be 1/8" to have a strong
spark. If okay, replace pilot
3. A) Check remote shut off
valves from fireplace. Usually
there is a valve near the fire-
place and sometimes there is a
valve near the main. There can
be more than one (1) valve be-
tween the fireplace and main
B) Low pressure can be caused
by a variety of situations such
as bent line, or gas supplier
3. No gas or low gas pressure
4. If using propane/LP gas, no 4. Check propane/LP supply
propane/LP gas in tank
and contact local propane/LP
supplier
Fireplace produces a clicking/ 1. Metalexpandingwhileheating 1. This is common with most
ticking noise just after burner is
lit or shut off
or contracting while cooling
fireplaces. If noise is exces-
sive, contact qualified service
person
24
108795-01N
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TROUBLESHOOTING
Continued
WARNING: If you smell gas
• Shut off gas supply.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in
your building.
• Immediately call your gas supplier from a neighbor’s phone.
Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
IMPORTANT: Operating fireplace where impurities in air exist may create odors. Cleaning supplies,
paint, paint remover, cigarette smoke, cements and glues, new carpet or textiles, etc., create fumes.
These fumes may mix with combustion air and create odors.
OBSERVED PROBLEM
POSSIBLE CAUSE
REMEDY
Fireplace produces unwanted 1. Fireplace burning vapors 1.Ventilate room. Stop using
odors
from paint, hair spray, glues,
etc. (See IMPORTANT state-
ment above)
odor causing products while
fireplace is running
2. For propane/LPgas, low fuel 2. Contact local propane/LPsup-
supply plier
3. Gas leak. See Warning 3. Locateandcorrectallleaks(see
statement at top of page Gas Line Hook-Up, page 13)
Gasodorevenwhencontrolknob 1. Gas leak. See Warning 1. Locateandcorrectallleaks(see
is in OFF position
statement at top of page
2. Control valve defective
Gas Line Hook-Up, page 13)
2. Replace control valve
Gas odor during combustion
1. Foreign matter between con- 1. Take apart gas tubing and
trol valve and burner remove foreign matter
2. Gas leak. See Warning 2. Locateandcorrectallleaks(see
statement at top of page
Gas Line Hook-Up, page 13)
Dark residue on logs or inside 1. Improper log placement
1. Properly locate logs
2. Air holes at burner inlet 2. Clean out air holes at burner
of fireplace
blocked
inlets. Periodically repeat as
needed
3. Burner flame holes blocked 3. Remove blockage or replace
burner
4. Improper venting or ex- 4. Have the vent system inspect-
cessive blockage
ed, including the termination
cap. Remove any restrictions
or obstruction
5. Excessive amounts of embers 5. Clear excess embers until a
and pan material
minimum gap of 1/2" remains
under the grate
108795-01N
25
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ILLUSTRATED PARTS BREAKDOWN
MODELS
M36(B,H), M36P(B,H), M42(B,H), M42P(B,H), VM36(B,H), VM36P(B,H),
VM42(B,H) AND VM42P(B,H)
51
21
57
3
57
25
2
10
11
6
32
26
28
50
18
1
31
43
20
27
33
37
36
38
��
35
34
24
30
11
22
49
63
34
35
��
29
63
52
61
14
43
12
62
9
52
58
59/60
4
15
48
16
17
13
42
8
23
7
40
17
45
56
39
46
44
19
5
41
47
54
55
7
47
26
108795-01N
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PARTS LIST
This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 22 of this manual.
KEY M36(B,H) M42(B,H)
NO. VM36(B,H) VM42(B,H)
KEY M36(B,H) M42(B,H)
NO. VM36(B,H) VM42(B,H)
DESCRIPTION QTY
DESCRIPTION QTY
1
2
3
14153
14153
Micro Switch
Insulation Pan
Fireplace Top
Assembly
Fireplace
Surround
1
1
1
35 901064-03 901064-08 Orifice (NG)
901065-13 901065-12 Orifice (LP)
36 108084-01 108084-01 Pilot (NG)
108084-03 108084-03 Pilot (LP)
37 108085-01 108085-01 Pilot Orifice
(NG)
1
1
1
1
1
**
**
**
**
4
5
6
**
**
1
1
1
106642-01 106642-01 Air Rod
Retainer
106643-01 106643-01 Damper Rod
Retainer
108085-02 108085-02 Pilot Orifice
(LP)
1
2
1
1
38 11102
39 14512
14513
11102
14512
14513
Screw, #8-
32 x 3/8
Gas Control
Valve (NG)
Gas Control
Valve (LP)
7
8
106651-01 107805-01 Panel Closure
2
1
**
**
Firebox
Bottom
Firebox
Surround
9
**
**
1
40 107741-01 107741-01 Valve Bracket
41 14261 14261 Piezo Ignitor
42 111288-02 111288-02 Manual Valve
w/ Flex Hose
43 108769-01 108769-02 Extension
Deflector
44 108005-01 108005-01 Wire Harness
45 108005-02 108005-02 Wire Harness
1
1
1
10 106657-02 107811-02 Air Separator
11 11408
12 See page 28
13 See page 28
14 See page 28
15 See page 28
1
2
1
1
1
1
11408
Bushing
Left Refractory
Right Refractory
Rear Refractory
Bottom Rear
Refractory
Bottom Front
Refractory
Firebox
Support Leg
2
1
1
2
2
1
1
1
46 11418
47 12105
48 14123
49 14574
11418
107840-01 Screen
14123
106543-01 Limit Switch
Push-On Nut
16 See page 28
1
2
1
17
**
**
Strain Relief
18 106687-01 106887-02 Damper Can
Collar
19 106691-01 107839-01 Screen Rod
50
**
**
Collar
Insulation
2
1
51 20023
52 20027
20488
20027
Starter Collar
Brick Liner
Retainer
1
2
20
**
**
Firebox Top
Assembly
21 106699-01 106699-01 Transition 6"
B-Vent Collar
22 106703-01 106703-01 Air Kit Door
Assembly
23
24 106948-02 107823-02 Smoke
Deflector
1
1
53 20042
54 20088
55 20089
56 20090
57 20280
20042
20088
20089
20090
20280
**
Air Kit Cover
Door Stop
Pivot Clip
Spring Clip
Top Spacer
1
1
2
2
4
4
**
**
Firebox Face
1
1
58
**
Gas Knockout
Cover
25
**
**
Fireplace Top
Insulation
1
1
59
60
**
**
**
—
22924
24353
11165
Gas Conduit
Gas Conduit
Draft Diverter
Box Assembly
Screw, #10 x
5/8 Mod. Tr.
Blk. Ox
1
1
1
1
2
26 107796-01 107796-02 Grate
Assembly
27 107742-01 107742-02 Burner Pan
28 107795-01 107831-01 Burner Tube
29 107748-01 107748-01 Burner
Bracket
61 22912
62 24353
63 11165
1
1
1
30 107985-01 107985-02 Pilot Shield
31 901681-01 901681-01 Burner Clamp
1
1
1
1
PARTS AVAILABLE NOT SHOWN
901155-01 901155-01 Vermiculite
Bag
901156-01 901156-01 Pan Material
901157-01 901157-01 Lava Rock
1
32 11209
33 11147
11209
11147
Nut, #10-24
Screw, #10-
24 x 1/2
1
1
1
34 901066-01 901066-01 Brass Air
Mixer (NG)
1
1
22180
22180
Wall Switch
Kit
901066-02 901066-02 Brass Air
Mixer (LP)
** Not a field replaceable part.
108795-01N
27
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ILLUSTRATED PARTS BREAKDOWN
BRICK LINERS FOR MODELS
M36(B,H), M36P(B,H), VM36(B,H) AND VM36P(B,H)
14
12
16
13
15
KEY M36(B,H) M42(B,H)
NO. VM36(B,H) VM42(B,H)
DESCRIPTION
QTY
1
1
1
1
1
1
1
1
1
1
1
1
1
1
12
13
14
15
106658-02 107812-02 Left Refractory, Std. Brick (M36B/M42B)
108164-02 108169-02 Left Refractory, Herringbone (M36H/M42H)
106658-01 107812-01 Left Refractory, Std. Brick (VM36B/VM42B)
108164-01 108169-01 Left Refractory, Herringbone (VM36H/VM42H)
106659-02 107814-02 Right Refractory, Std. Brick (M36B/M42B)
108165-02 108170-02 Right Refractory, Herringbone (M36H/M42H)
106659-01 107814-01 Right Refractory, Std. Brick (VM36B/VM42B)
108165-01 108170-01 Right Refractory, Herringbone (VM36H/VM42H)
106660-02 107816-02 Rear Refractory, Std. Brick (M36B/M42B)
108166-02 108171-02 Rear Refractory, Herringbone (M36H/M42H)
106660-01 107816-01 Rear Refractory, Std. Brick (VM36B/VM42B)
108166-01 108171-01 Rear Refractory, Herringbone (VM36H/VM42H)
106661-02 107818-02 Bottom Rear Refractory, Std. Brick(M36/M42, M36B/M42B)
108167-02 108172-02 Bottom Rear Refractory, Herringbone (M36H/M42H)
106661-01 107818-01 Bottom Rear Refractory, Std. Brick (VM36/VM42,
VM36B/VM42B)
1
108167-01 108172-01 Bottom Rear Refractory, Herringbone (VM36H/VM42H)
106662-02 107820-02 Bottom Front Refractory, Std. Brick (M36/M42,
M36B/M42B)
1
1
16
108168-02 108173-02 Bottom Front Refractory, Herringbone (M36H/M42H)
106662-01 107820-01 Bottom Front Refractory, Std. Brick (VM36/VM42,
VM36B/VM42B)
1
1
108168-01 108173-01 Bottom Front Refractory, Herringbone (VM36H/VM42H)
1
28
108795-01N
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ILLUSTRATED PARTS BREAKDOWN
LOGSETS FOR MODELS
M36(B,H), M36P(B,H), VM36(B,H) AND VM36P(B,H)
5
4
6
3
2
1
KEY PART
NO. NUMBER
DESCRIPTION
QTY.
-
107999-01 Log Set
1
2
3
4
5
6
108724-01 Right Front 9" Split Log
901098-01 Rear Log
1
1
1
1
1
1
108720-01 Top Right Log - 11 3/4
"
108721-01 Top Right Log - 16"
108722-01 Top Left Log - 13 1/2" Y-Log
108723-01 Top Left Log - 11"
108795-01N
29
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ILLUSTRATED PARTS BREAKDOWN
LOGSETS FOR MODELS
M42(B,H), M42P(B,H), VM42(B,H) AND VM42P(B,H)
5
4
3
6
1
2A
2B
KEY PART
NO. NUMBER
DESCRIPTION
QTY.
-
107999-02 Log Set
901098-02 Rear Log
1
1
1
1
1
1
1
1
2A 108723-01 Left Front Log - 11"
2B 108839-01 Right Front Log - 15 3/4" Round
3
4
5
6
108722-01 Top Left Log - 13 1/2" Y-Log
108838-01 Inside Top Left Log - 15 3/4" Split
108721-01 Inside Top Right Log - 16"
108720-01 Top Right Log - 11 3/4
"
30
108795-01N
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ACCESSORIES
NOTICE: All accessories may not be available for all fireplace models.
Purchase these firebox accessories from your local dealer. If they can not supply these accessories, call
DESAʼs Sales Department at 1-866-672-6040 for information. You can also write to the address listed
on the back page of this manual.
BLOWER KIT
AIR KIT - AK4
BK - Squirrel Cage Blower With Speed Control
Optional kit helps offset the negative pressure of-
ten existing in today's tightly constructed homes.
BK3E - Triple Fan Blower System
REMOTE CONTROL KITS
PERIMETER TRIM
RC - Standard On/Off Millivolt Remote Control
Kit
PT36 - 36" Perimeter Trim - Black
PT36B - 36" Perimeter Trim - Brushed Brass
PT36PB - 36" Perimeter Trim - Polished Brass
PT36P - 36" Perimeter Trim - Platinum
PT42 - 42" Perimeter Trim - Black
HRC100 - Hand-Held Remote Control Kit
GWMT1 - Wall-Mount Remote Control Kit
PROPANE CONVERSION KITS
PCBM-36 - Propane Conversion Kit for 36" B-
Vent Millivolt Fireplace
PT42B - 42" Perimeter Trim - Brushed Brass
PT42PB - 42" Perimeter Trim - Polished Brass
PT42P - 42" Perimeter Trim - Platinum
PCBM-42 - Propane Conversion Kit for 42" B-
Vent Millivolt Fireplace
LOUVER TRIM (Rolled Louvers
Only)
LT36B - 36" Louver Trim Kit - Brushed Brass
EXTRUDED ALUMINUM BI-FOLD
GLASS DOORS
BD36 - 36" Black Finish
LT36P - 36" Louver Trim Kit - Platinum
BD36B - 36" Brushed Brass Finish
BD36P - 36" Platinum Finish
BD42 - 42" Black Finish
LT36PB - 36" Louver Trim Kit for VM36(B,H)
- Polished Brass
LT42B - 42" Louver Trim Kit - Brushed Brass
LT42P - 42" Louver Trim Kit - Platinum
BD42B - 42" Brushed Brass Finish
BD42P - 42" Platinum Finish
LT42PB - 42" Louver Trim Kit for VM42(B,H)
- Polished Brass
BRICK LINER
(For M36(B,H), M36P(B,H), M42(B,H) and
M42P(B,H)
FACE/LOUVER PANEL KITS
SP36, SP42 - Smooth Faced Panel Kit- Black
BL36 - 36" Refractory Standard Brick Liner Kit
SL36, SL42 - Stamped Louver Panel Kit-
Black
BL42 - 42" Refractory Standard Brick Liner Kit
RL36, RL42 - Rolled Louver Kit- Black
FP36, FP42 - Filigree Panel Kit- Black
BL36H - 36" Refractory Herringbone Brick
Liner Kit
BL42H - 42" Refractory Herringbone Brick
Liner Kit
FP36B, FP42B - Filigree Panel Kit- Brushed
Brass
FP36P, FP42P - Filigree Panel Kit- Platinum
(For VM36(B,H), VM36P(B,H), VM42(B,H)
FP36PB, FP42PB - Filigree Panel Kit- Polished
Brass
and VM42P(B,H)
BL36S - 36" Refractory Standard Brick Liner
Kit
FIRE CRACKLE - CF6-A
Creates the sound of a real burning fire.
BL42S - 42" Refractory Standard Brick Liner
Kit
BL36HS - 36" Refractory Herringbone Brick
Liner Kit
BL42HS - 42" Refractory Herringbone Brick
Liner Kit
108795-01N
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WARRANTY INFORMATION
KEEP THIS WARRANTY
Model
Serial No.
Date Purchased
Always specify model and serial numbers when communicating with the factory.
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our
standard written warranty. We make no other warranty, expressed or implied.
LIMITED WARRANTY
VENT-FREE FIREBOX
DESA warrants this product to be free from defects in materials and components for four (4) years from the date
of first purchase, provided that the product has been properly installed, operated and maintained in accordance
with all applicable instructions. To make a claim under this warranty the Bill of Sale or cancelled check must
be presented.
This warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s) required to
restore this heater to proper operating condition and an allowance for labor when provided by a DESAAuthorized
Service Center. Warranty part(s) MUST be obtained through authorized dealers of this product and/or DESA who
will provide original factory replacement parts. Failure to use original factory replacement parts voids this war-
ranty. The heater MUST be installed by a qualified installer in accordance with all local codes and instructions
furnished with the unit.
This warranty does not apply to parts that are not in original condition because of normal wear and tear or parts
that fail or become damaged as a result of misuse, accidents, lack of proper maintenance or defects caused by
improper installation. Travel, diagnostic cost, labor, transportation and any and all such other costs related to
repairing a defective heater will be the responsibility of the owner.
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE
OF THE PRODUCT; THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED
WARRANTIESAND LIMITS THE DURATION OFANYAND ALL IMPLIED WARRANTIES, INCLUDING
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE TO FOUR (4)
YEARS ON ALL COMPONENTS FROM THE DATE OF FIRST PURCHASE; AND DESAʼS LIABILITY IS
HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND DESA HEATING PRODUCTS
SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT, INCI-
DENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of
incidental or consequential damages, so the above limitation on implied warranties or exclusion or limitation on
damages may not apply to you.
This warranty gives you specific legal rights and you may also have other rights that vary from state to state.
For information about this warranty write:
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
108795-01
108795 01
Rev. N
NOT A UPC
04/05
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