Desa M36E(B Quick start guide

NATURAL GAS MODELS
M36E(B,H), M42E(B,H),
VM36E(B,H) AND VM42E(B,H)
PROPANE/LP GAS MODELS
M36EP(B,H), M42EP(B,H),
VM36EP(B,H) AND VM42EP(B,H)
B-VENT DECORATIVE ELECTRONIC IGNITION GAS FIREPLACE
OWNER’S OPERATION AND INSTALLATION MANUAL
For more information, visit www.desatech.com
FOR YOUR SAFETY
— Donotstoreorusegasolineoranyotherammable
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.
• 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re
department.
— Installationandservicemustbeperformedbyaquali-
edinstaller,serviceagencyorthegassupplier.
INSTALLER:Leavethismanualwiththeappliance.
CONSUMER:Retainthismanualforfuturereference.
WARNING:Iftheinformationintheseinstructions
isnotfollowedexactly,areorexplosionmayresult
causingpropertydamage,personalinjuryordeath.
O-TL REPORT # 114-F-16-4

www.desatech.com 108796-01T2
 WARNING: Improper installation, adjustment, al-
teration, service or maintenance can cause injury or
propertydamage.Refertothismanualforcorrectin-
stallation and operational procedures. For assistance
or additional information consult a qualied installer,
service agency or the gas supplier.
NOT FOR USE WITH SOLID FUEL
CHECK LOCAL CODES PRIOR TO INSTALLATION
SAVE THIS BOOK
Thisbookisvaluable.Inadditiontoinstructingyouon
howtoinstallandmaintainyourappliance,italsocon-
tainsinformationthatwillenableyoutoobtainreplace-
mentpartsoroptionalaccessoryitemswhenneeded.
Keepitwithyourotherimportantpapers.
Thisappliancemaybeinstalledinanaftermarket*,per-
manentlylocated,manufactured(mobile)home,where
notprohibitedbystateorlocalcodes.
Thisapplianceisonlyforusewiththetypeofgasindi-
cated on the rating plate.
This appliance is not convertible for use with other
gases,unlessacertiedkitisused.
*Aftermarket:Completionofsale,notforpurposeofresale,fromthemanufacturer.
StateofMassachusetts:Theinstallationmustbemade
byalicensedplumberorgastterintheCommonwealth
of Massachusetts.
TABLE OF CONTENTS
Safety .................................................................. 3
Unpacking............................................................ 4
Introduction.......................................................... 4
Selecting Location ............................................... 5
Product Specications......................................... 6
PreInstallation Preparation .................................. 7
Venting Installation .............................................. 9
Installation ..........................................................11
Operation........................................................... 18
Inspecting Burners............................................. 19
Cleaning and Maintenance................................ 20
Replacement Parts............................................ 20
Wiring Diagram.................................................. 21
Service Hints ..................................................... 21
Technical Service............................................... 21
Troubleshooting................................................. 22
Parts .................................................................. 24
Accessories ....................................................... 29
Warranty ..............................................Back Cover

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108796-01T 3
SAFETY
WARNING: This product con-
tainsand/orgenerateschemicals
knowntotheStateofCalifornia
tocausecancerorbirthdefects
orotherreproductiveharm.
IMPORTANT:Readthisowner’s
manualcarefullyandcompletely
before trying to assemble, op-
erate or service this replace.
Improper use of this replace
cancauseseriousinjuryordeath
from burns, re, explosions,
electrical shock and carbon
monoxidepoisoning.
DANGER:Carbonmonoxide
poisoningmayleadtodeath!
This replace is a vented product. This replace
will not produce any gas leakage into your home
if properly installed. This replace must be
properly installed by a qualied service person.
If this unit is not properly installed by a qualied
service person, gas leakage can occur.
CarbonMonoxidePoisoning: Early signs of
carbon monoxide poisoning resemble the u,
with headaches, dizziness or nausea. If you
have these signs, the replace may not have
been installed properly. Getfreshairatonce!
Have replace inspected and serviced by a
qualied 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 inu-
ence of alcohol and those at high altitudes.
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. However, the odor added
to these gases can fade. Gas may be present
even though no odor exists.
Make certain you read and understand all
warnings. Keep this manual for reference. It
is your guide to safe and proper operation of
this replace.
WARNING: Any change to
thisreplaceoritscontrolscan
bedangerous.
1. This appliance is only for use with the type
of gas indicated on the rating plate. This
appliance is not convertible for use with
other gases unless a certied kit is used.
2. For propane/LP replace, do not place
propane/LP supply tank(s) inside any
structure. Locate propane/LP supply
tank(s) outdoors. To prevent performance
problems, do not use propane/LP fuel tank
of less than 100 lbs. capacity.
3. 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 you gas supplier, call
the re department.
4. Never install the replace
• in a recreational vehicle
• where curtains, furniture, clothing or other
ammable objects are less than 36" from
front and 42" from top of replace. For
side clearances see Figure 6, page 7
• in high trafc areas
• in windy or drafty areas
5. This replace reaches high temperatures.
Keep children and adults away from hot
surfaces to avoid burns or clothing igni-
tion. Fireplace will remain hot for a time
after shutdown. Allow surfaces to cool
before touching.
6. Carefully supervise young children when
they are in the room with replace.
7. A hearth extension is not required with this
appliance. If one is installed, it is for aes-
thetic purposes only and does not have
to meet the standard requirements.
8. Turn replace off and let cool before ser-
vicing or repairing. Only a qualied service
person should install, service or repair
this replace. Have replace inspected
annually by a qualied service person.
9. You must keep control compartments,
burners and circulating air passages clean.
More frequent cleaning may be needed due
to excessive lint and dust from carpeting,
bedding material, etc. Turn off the gas valve
and pilot light before cleaning replace.
10. Have venting system inspected annually by
a qualied service person. If needed, have
venting system cleaned or repaired. See
Cleaning and Maintenance, page 20.

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11. Keep the area around your replace clear
of combustible materials, gasoline and
other ammable vapor and liquids. Do
not run replace where these are used or
stored. Do not place items such as clothing
or decorations on or around replace.
12. Do not use this replace to cook food or
burn paper or other objects.
13. Do not use any solid fuels (wood, coal,
paper, cardboard, etc.) in this replace.
Use only the gas type indicated on re-
place nameplate.
14. This appliance, when installed, must be
electrically 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.
15. Do not obstruct the ow of combustion
and ventilation air in any way. Provide
adequate clearances around air open-
ings into the combustion chamber along
with adequate accessibility clearance for
servicing and proper operation.
16. Do not install replace directly on carpet-
ing, vinyl tile or any combustible material
other than wood. The replace must set
on a metal or wood panel extending the
full width and depth of the replace.
17. Do not use replace if any part has been
exposed to or under water. Immediately
call a qualied service person to arrange
for replacement of the unit.
18. Do not operate replace if any log is
broken.
19. Do not use a blower insert, heat exchang-
er insert or other accessory not approved
for use with this replace.
20. Provide adequate clearances around air
openings.
SAFETY
Continued
UNPACKING
The following items are packed inside the
rebox. Remove before positioning rebox
into framing.
• Transition Collar - For vent connection
• Ceramic Log Pack - Shrink-wrapped on
cardboard
• Three (3) plastic bags containing lava rock,
pan and ember materials
• Rear Log - Remove two plastic quick ties
from around burner and grate
• Grate Stand - Lift off of burner pan
Check all items for any shipping damage. If
damaged, promptly inform dealer or distributor
where you bought the product.
Safely retain these items for later installation.
INTRODUCTION
Models M36E(P)(B,H), VM36E(P)(B,H),
M42E(P)(B,H) and VM42E(P)(B,H) are vented
gas replaces that use an electronic control
valve and electronic 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.
WARNING: This gas appli-
ancemustnotbeconnectedto
achimneyueservicingasolid
fuelburningappliance.
Models M36E(B,H), VM36E(B,H), M42E(B,H)
and VM42E(B,H) are factory equipped for use
with natural gas and must be converted when
intended for use with propane/LP gas. A respec-
tive model PCBE-36 or PCBE-42 conversion
kit may be purchased for simple conversion to
propane/LP gas. See Accessories, page 29.
BEFORE YOU BEGIN
Before beginning the installation of your
appliance, read these instructions through
completely.
This DESA Heating, LLC appliance and its
approved components are safe when installed
according to this installation manual and are
operated as recommended by DESA Heating,
LLC. Unless you use DESA Heating, LLC ap-
proved components tested for this appliance,
YOUMAYCAUSEAFIREHAZARD!
The DESA Heating, LLC warranty will be
voided by and DESA Heating, LLC disclaims
any responsibility for the following actions:
A) Modication of the appliance or any of the
components.
B) Use of any component part not approved
by DESA Heating, LLC in combination
with this appliance.
C) Installation and/or operation in a manner
other than instructed in this manual.
D) The burning of anything other than the type of
gas approved for use in this gas appliance.

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108796-01T 5
The installation must conform with local codes
or, in the absence of local codes, with the cur-
rent National Fuel Gas Code, ANSI Z223.1/
NFPA 54. This appliance complies with ANSI
Z21.50/CSA 2.22.
WARNING: Installation of this
appliance should be done by
a qualied service person well
trained in the installation of such
appliances.Youwillalsoneeda
building permit from your local
BuildingandSafetyCommission-
erbeforeinstallingthisappliance;
otherwiseyourinsuranceco.may
not cover this appliance.
NOTICE: This appliance is not
intendedtobeusedasaprimary
source of heat.
Figure 1 - Possible Locations for
Installing Appliance
INTERNAL WALL
INSTALLATION
CORNER
INSTALLATION
FULL
PROJECTION
INSTALLATION
FLUSH
INSTALLATION
CAUTION: Do not connect
appliancebeforepressuretest-
inggaspiping.Damagetogas
valvemayresultandanunsafe
conditionmaybecaused.
The appliance and it’s 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).
The appliance must be isolated from the gas
supply 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).
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.
INTRODUCTION
Continued
SELECTING LOCATION
To determine the safest and most efcient
location for your appliance, you must take into
consideration the following guidelines:
1. The location must allow for proper clear-
ances (see Clearances, page 7).
2. Consider a location where heat output
would not be affected by drafts, air con-
ditioning 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 com-
mon locations.
Flush installations are recommended where
living space is limited or at a premium and
since the space required to enclose the ap-
pliance 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.
Projected installations can extend any
distance into the room. A projection may
be ideal for a new addition on an existing,
nished wall.
Corner installations make use of space
that may not normally be used and provides
a wider and more efcient 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.

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PRODUCT SPECIFICATIONS
S
T
P
Q
R
X
Outside Air
Kit Location
(Optional)
K
7"
J
I
M
LV
13.5"
1.5"
Glass Door
(Optional)
W
O
N
Alternate Gas
Supply Inlet
7"
G
H
F
A
Stand Off
Collar
For Use With
6"Ø Type B-1
Ve nt Pipe Only
B
E
D
C
DIMENSIONS
HEARTH AREA
7"
Figure 2 - Appliance Dimensions
GAS RATING - NATURAL
M36E(B,H),VM36E(B,H) M42E(B,H),VM42E(B,H)
Max. Input Rating: 40,000 Btu/Hr 45,000 Btu/Hr
Manifold Pressure: 3.5" WC (.87 kPa) 3.5" WC (.87 kPa)
Minimum Supply Pressure: 4.5" WC (1.12 kPa) 4.5" WC (1.12 kPa)
Maximum Supply Pressure: 10.5" WC (2.66 kPa) 10.5" WC (2.66 kPa)
Orice Size: # 30 # 29
GAS RATING - PROPANE/LP
M36P(B,H),VM36P(B,H) M42P(B,H),VM42P(B,H)
Max. Input Rating: 40,000 Btu/Hr 45,000 Btu/Hr
Manifold Pressure: 10" WC (2.49 kPa) 10" WC (2.49 kPa)
Minimum Supply Pressure: 11" WC (2.74 kPa) 11" WC (2.74 kPa)
Maximum Supply Pressure: 13" WC (3.23 kPa) 13" WC (3.23 kPa)
Orice Size: # 52 # 50
Model 36 Model 42 Model 36 Model 42 Model 36 Model 42
A29" 36" I 40 1/4"44 1/4"Q 13 7/8" 14"
B 5/8" 5/8" J21" 24" R 10 1/2"12 1/2"
C41" 48" K 8" 9" S 2 1/2"2 1/2"
D12" 14" L 34 3/4" 42" T 8 1/8"8 1/8"
E 21 1/4" 23" M42" 49" U11" 12 3/4"
F 22 1/4" (24" w/o Brick) 29 1/4" (31" w/o Brick) N36" 40" V7" 7"
G32 5/8" (34" w/o Brick) 39 1/2" (41 1/4" w/o Brick) O37" 41" W 2 1/4"2 1/4"
H 15 3/4" (16 3/4" w/o Brick) 17 3/4" (18 3/4" w/o Brick) P 8 5/8"10 1/2"X5" 4 1/2"

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108796-01T 7
PREINSTALLATION PREPARATION
Figure 3 - Minimum Clearances
(Top View)
0"
0" Clearance
Nailing
Flange
Front Face
Left Side
Surround
Back
Drywall
2 x 4 Stud
Figure 4 - Minimum Clearances
(Front View)
** **
42" (106.7 cm)
Min. Clearance
from Opening to
Ceiling 0" Clearance
Ceiling
1" (2.5 cm)
Min. Clearance
to "B" Vent's
Outer Pipe
Maintain 2" (5.1 cm)
Min. Clearance to
Transition Pipe as
Measured at Outer
Ve nt Collar
Required air
spaces are
indicated with
an "
*
". Do not
pack with
insulation or
any other
material.
DO NOT BLOCK
OR OBSTRUCT
OPENINGS
0" Clearance to
Combustible or
Noncombustible
Flooring
MANTEL CLEARANCES AND WALL
DETAILS
A combustible mantle shelf maybe installed a
maximum 12" (22.9 cm) from wall. Figures 5
and 6 show the minimum allowable distances
from various combustible mantle components
in relation to replace opening.
Spacer
3" (7.6 cm)
1
1
/
2
"
(3.8 cm) Max.
B
6" (15.2 cm)
A
12"
(22.9 cm)
Combustible
Materials
Header
Figure 5 - Mantel Clearances - Side View
(Cross Section)
1 1/2"
(3.8 cm)
Max. 3" (7.6 cm)
Max.
6" (15.2 cm)
Max. A
B
Outer Surround Combustible
Material May
Be Used
TOP VIEW
SAFE
ZONE
Perpendicular
Wall
Figure 6 - Side Clearances - Top View
(Cross Section)
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
 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.
M36E(B,H),
M36EP(B,H)
VM36E(B,H),
VM36EP(B,H)
M42E(B,H),
M42EP(B,H)
VM42E(B,H),
VM42EP(B,H)
A14" (35.6 cm) 15" (38 cm)
B 8" (20.3 cm) 9" (22.9 cm)
M36E(B,H),
M36EP(B,H)
VM36E(B,H),
VM36EP(B,H)
M42E(B,H),
M42EP(B,H)
VM42E(B,H),
VM42EP(B,H)
A9" (22.9 cm) 6" (15.2 cm)
B 12" (30.5 cm) 9" (22.9 cm)

www.desatech.com 108796-01T8
PREINSTALLATION PREPARATION
Continued
FRAMING
1. Frame appliance enclosure as illustrated
in Figures 7 and 8.
Note: If a wall covering is used to line
enclosure, then all measurements must
be from surface of covering.
2. Place appliance into framing and se-
cure.
Note: If appliance is to be raised above
oor level, a platform must be built to
support appliance.
3. Install supply line to appliance using a 1/2"
NPT black iron gas line terminating 2 5/16"
above bottom of appliance. The gas line
must be installed through lower left side
access point or alternate access hole in
the bottom of appliance (see Figure 19,
page 13).
4. Repack insulation around gas line to cover
any remaining openings in conduit sleeve.
Prepare incoming gas line with teflon
tape or pipe joint compound and hook up
incoming gas line to exible gas line.
Note: If 1/2" NPT black iron pipe does not
mate with tting at the end of exible gas
line, remove tting and replace with a 37
degree are 3/4"-12, 1/2" NPT (female)
tting.
 WARNING: When nishing
appliance,donotoverlapcom-
bustiblematerialontotheblack
front face. Brick, tile or other
noncombustiblematerialsmay
beappliedtothefaceprovided
that any gap is between the
material used and the face is
caulkedwithanoncombustible
caulking.
Figure 7 - Rough Opening for Installing
in Wall
B
C
A
Figure 8 - Corner Installation Guidelines
A
B
C
D
These Dimensions Allow for a 3/4"
Clearance at Sides and Back of Fireplace.
However, 0" Clearance is Permitted
3/4" Clearance Not Required
at Nailing Flanges
M36E(B,H),
M36EP(B,H)
VM36E(B,H),
VM36EP(B,H)
M42E(B,H),
M42EP(B,H)
VM42E(B,H),
VM42EP(B,H)
A 40 3/8" (102 cm) 44 3/8" (112 cm)
B21 3/8" (54.3 cm) 23 1/8" (58.7 cm)
C 41 1/4" (104.8 cm) 48 1/4" (122.6 cm)
M36E(B,H),
M36EP(B,H)
VM36E(B,H),
VM36EP(B,H)
M4E2(B,H),
M42EP(B,H)
VM42E(B,H),
VM42EP(B,H)
A 24 1/2" (62.2 cm) 27 9/16" (70 cm)
B73 7/8" (187.6 cm) 83 7/8" (213 cm)
C 52 3/16" (132.6 cm) 59 5/16" (150.6 cm)
D 17 1/4" (43.8 cm) 19 1/2" (49.5 cm)

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108796-01T 9
INSTALLING TRANSITION PIPE AND
STARTER COLLAR
The transition pipe and starter collar shown
in Figure 9 are supplied with replace, unat-
tached and ready for installation. Remove
starter collar and set aside. Slide transition
pipe over vent collar and attach with a mini-
mum of three screws. Replace starter collar
over transition pipe and attach using four
screws located on leg stands (ve used on
model M42E). To install B-vent piping, slide
rst piece of B-vent over transition pipe and
attach with either a minimum of two screws
or other means approved by the vent manu-
facturer. Figure 9 - Installing Transition Pipe and
Starter Collar
B-Vent Piping
Transition Pipe
Starter Collar
Vent Collar
PREINSTALLATION PREPARATION
Continued
VENTING INSTALLATION
at 60° 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% rule applies. If the
lateral length must exceed 75% then the
system must be sized in accordance with the
Category I venting tables.
Example2: Shows a multiple offset each at
45° of inclination. Multiple offsets are permit-
ted if they do not exceed 45° of inclination. The
total lengths of the two offsets are not required
to meet the 75% allowable rule.
Example3: Shows a single offset at 45° of
inclination and therefore the lateral length at
10 feet of offset does not have to meet the
75% rule.
In each case the offsets must be supported
and restops must be positioned wherever
the vent must pass through a sub-oor, ceil-
ing joist or an attic overhang. The vent pipe
must terminate vertically into a listed type vent
cap and extend a sufcient height through
an approved roof ashing, roof jack or a roof
thimble. At all points the listed clearances
must be maintained.
Vent terminations must be located in ac-
cordance with height and proximity rules of
NFPA No. 54. These rules apply to vents at
12" 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).
A B-type venting system must be connected
to appliance for venting to the outside of
building.
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 specic
requirements or in absence of local codes,
follow Section 7.0 of the current National Fuel
Gas Code ANSI Z223.1/NFPA 54.
This gas appliance must be vented to the
outdoors only and may not be terminated into
an attic space or into a chimney ue servicing
a solid-fuel burning appliance.
This appliance may be vented through a
manufactured chimney system or a masonry
chimney using a B-vent adapter or a chim-
ney liner system if all are listed, inspected
and approved by local codes and/or building
authorities.
The examples shown in Figure 10, page 10
are typical of most B-vent installations and
codes practices.
Example1: Shows the minimum allowable
system height and lateral offset for a 60° or
greater inclination. Code species that offsets
at 60° or greater are considered horizontal
and must follow the 75% rule for lateral to
total vertical system height. Codes also al-
low only one offset in the total system when

www.desatech.com 108796-01T10
Maintain
Listed
Clearance
Maintain
Listed
Clearance
12' Min.
12' Min. 45°
45°
6'
8'
12' Min.
60° 45°
Position
Firestop
Position
Firestop
Position
Firestop
Listed
Vent Cap
Listed
Vent Cap
Listed
Vent Cap
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Support Each
Lateral At
Least Every
6 Feet
Maintain
Listed
Clearance
10'
EXAMPLE 3EXAMPLE 2
EXAMPLE 1
Figure 10 - Typical B-Vent Conguration
VENTING INSTALLATION
Continued
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 recommended diameter of the ue,
in this case 6".
The ue connection must be made using
listed B-type connectors and the existing
system must be code inspected for damage
and proper installation.
It is not recommended that this appliance be
common vented with an existing gas burning
appliance. However, if it becomes necessary
to common vent this appliance, the venting
system must be sized and congured in ac-
cordance with the common venting guides
Appendix G of the current National Fuel Gas
Code ANSI Z223.1/NFPA 54.
Note: Before connecting this appliance to an
existing vent system or a common venting
system consult with your local architect, plan-
ner or building ofcial.
WARNING: This appliance
must be properly connected
to a system and must not be
connected to a chimney ue
servicing a separate solid fuel
burningappliance.
Lowest
Discharge
Opening
Listed
Ve nt Cap
8 Ft. Min.
Roof Pitch x/12
Listed Clearance
12
x
Listed
Gas
Ve nt
H (Min)
Height
From Roof
Figure 11 - B-Vent Terminations
Roof Pitch
H(Min.)
Feet Meter
Flat to 6/12 1.0 0.30
6/12 to 7/12 1.25 0.38
Over 7/12 to 8/12 1.5 0.46
Over 8/12 to 9/12 2.0 0.61
Over 9/12 to 10/12 2.5 0.76
Over 10/12 to 11/12 3.25 0.99
Over 11/12 to 12/12 4.0 1.22
Over 12/12 to 14/12 5.0 1.52
Over 14/12 to 16/12 6.0 1.83
Over 16/12 to 18/12 7.0 2.13
Over 18/12 to 20/12 7.5 2.27
Over 20/12 to 21/12 8.0 2.44

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108796-01T 11
CHECKING FOR PROPER VENTING
After completing and checking 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 re-
place opening and play it along entire length
of opening (see Figure 12). Proper venting
should tend to draw the ame or smoke into
the appliance. Improper venting or escaping
of spillage of burned gas, is indicated when
the match ickers or goes out. Smoke from a
cigarette will also tend to disperse away from
the appliance.
If the appliance is found to be improperly
venting, shut it off and notify your installer
or a qualied service agency to inspect the
venting system.
VENTING INSTALLATION
Continued
Check this area
along entire top
edge of replace
opening. Smoke
or ame should
be drawn into
appliance opening.
Figure 12 - Checking for Spillage
INSTALLATION
Figure 13 - Removing Front Refractory
Access Panel
Figure 14 - Installing WRC Remote Receiver
Fireplace
Receptacle
Remote
Control
Receiver
Extension Cord Ignition
Module Plug
NOTICE: This appliance is
equipped with a vent safety
shutoff switch which will shut
downtheapplianceinthecaseof
aventingproblem.Donotbypass
theventsafetyswitch.Iftheappli-
anceshouldshutdown,contacta
qualiedinstaller,serviceagency
or your gas supplier to have the
ventinspectedbeforeoperating.
WALL SWITCH INSTALLATION
The installation of a wall switch allows you
to activate the gas control valve and turn the
replace on and off. The wall switch is to be
connected to the incoming 120 volt regular
household wiring that supplies electricity to
the replace. Refer to wiring diagram in this
manual on page 18.
OPTIONAL REMOTE CONTROL
INSTALLATION(ModelWRC)
Note: If using optional wireless hand-held
remote control, wall switch must be in the ON
position to be operational. The remote control
then becomes the switching mechanism for
replace operation.
1. Remove front refractory access panel by
lifting up and angling out of rebox open-
ing (see Figure 13).
2. The WRC model receiver does not require
a battery. Receiver can be installed by
plugging the short extension cord into
replace receptacle. Plug receiver unit
into extension cord. Plug ignition module
plug into receiver unit (see Figure 14).

www.desatech.com 108796-01T12
3" Min.
(7.6 cm)
Side Wall
Of Appliance
GAS LINE HOOK-UP
WARNING:Gaslinehookup
should be done by your gas
supplier or a qualied service
person.
WARNING: Before you pro-
ceed,makesureyourgassupply
is OFF.
A manual shutoff valve has been included in
the appliance’s gas supply system. You may
consider installing an extra gas shutoff valve
outside appliance’s enclosure (check with
local codes) where it can be accessed more
conveniently with a key through a wall as
shown in Figure 16.
In conformance with local codes, route a
1/2" NPT gas line to appliance through hole
in left side of rebox or sub-oor as shown
in Figure 17.
CAUTION:Donotkinkex-
iblegasline.
3. Activate remote handset battery by re-
moving insulating tab on back of handset
(see Figure 15). Battery is included pre-
installed.
4. Once the battery is activated unit is ready
to use.
5. Replace front refractory access panel.
INSTALLATION
Continued
DESA Heating, LLC recommends that a black
iron gas line be routed from the gas source,
through a sediment trap (shown in Figure 18)
and into appliance. Once connected through
appliance, a exible gas line may be used for
ease of installation to gas control valve (see
Figure 19, page 13).
Before connecting black iron gas line to inside
of appliance a sediment trap must be included
outside appliance between gas line and gas
shutoff valve. It must extend down 3" beyond
center of pipe. Prepare incoming black iron
gas line with teon tape or pipe joint com-
pound (Check with local building codes).
Figure 16 - Manual Shutoff Valve
Installation
Typical Exterior Wall Gas
Shutoff Installation
Key
Extension
Shutoff
Valve
Figure 17 - Routing Incoming Gas Line
A
1/2" NPT
Incoming Black
Iron Gas Line
7"
7"
Alternate Gas Supply
Through Sub-Floor
Incoming
1/2" Gas Line
Permitted by
Local Codes
Sediment
Trap (Not
Supplied)
Figure 18 - Sediment Trap
Figure 15 - Installing Battery into Back of
Handset
Pull to Remove
Insulation Tab
Battery Cover
12 Volt Battery
Back of
Handset
M36E(B,H),
M36EP(B,H
VM36E(B,H),
VM36EP(B,H)
M42E(B,H),
M42EP(B,H)
VM42E(B,H),
VM42EP(B,H)
A 8 5/8" (21.9 cm) 10 1/2" (26.7 cm)

www.desatech.com
108796-01T 13
P
I
L
O
T
ON
OFF
IN OUT
Figure 19 - Connecting Flexible Gas Line to Millivolt Valve
Gas Shutoff
Valve
Flexible Gas Line
Do NOT Kink
1/2" NPT
Incoming
Gas Line
Note:
1) Wire Connections
Not Shown for Clarity
2) * 1/8" NPT Plugged
Tapping
Red Surface Indicates For
Propane/LP Use Only Pilot Adj
Inlet Pressure Tap
Outlet
Pressure Tap
CAUTION:Compoundsused
onthreadedjointsofgaspiping
shallberesistanttotheaction
of Liqueed Petroleum (LP or
propane)andshouldbeapplied
lightlytoensureexcesssealant
does not enter the gas line.
WARNING: All gas piping
andconnectionsmustbetested
forleaksaftertheinstallationis
completed.
After ensuring that gas valve
ison,applyacommercialleak
detection solution to all con-
nectionsandjoints.Ifbubbles
appear, leaks can be detected
and corrected.
Donotuseanopenameforleak
testing and do not operate any
applianceifaleakisdetected.
INSTALLATION
Continued
Complete your gas installation by connect-
ing incoming gas line with exible gas line.
Secure tightly with wrench but DO NOT
OVERTIGHTEN.
EMBER AND PAN MATERIAL
PLACEMENT
1. Open bag(s) of vermiculite and ll entire
burner pan until burner tube is completely
covered (see Figure 20).
2. Smooth pan material just even with edges
of burner pan.
3. Remove ember material from bag and
atten small amounts into quarter size
pieces and lay on top of surface of pan
material (see Figure 21).
4. Place just enough to cover entire surface
and leave about a 1/2" gap under lower
grate members to allow air to ow (see
Figure 22, page 14).
Figure 20 - Fill Entire Burner Pan with
Vermiculite
Figure 21 - Ember Material on Surface of
Pan Material (Vermiculite)
Vermiculite
(Pan Material)
Burner Pan
Grate Ember
Material Burner
Pan
Vermiculite (Pan Material)
Grate

www.desatech.com 108796-01T14
0.5"
0.5"
Figure 22 - Pan and Ember Material
Clearances
Grate
Burner Pan
Pan and Ember
Material
INSTALLATION
Continued
LOG PLACEMENT FOR MODELS
M36E,M36EP,VME36ANDVM36EP
1. Place small front right log (log 1) on right
front of grate as shown in Figure 23.
2. Place large back log (log 2) onto grate
making sure notches rest over grate as
shown in Figure 23.
3. Place log 3 into notch on log 2, resting
front end on top of log 1 (see Figure 24).
4. Place upper end of log 4 into notch on log
2 as shown in Figure 24. Rest lower end
of log 4 onto middle grate nger as shown
in Figure 25.
5. Place upper end of log 5 into notch on left
of log 2 (see Figure 25). Rest lower end
of log 5 on grate as shown in Figure 26.
6. Insert lower end of log 6 between rst
two grate ngers as shown in Figure
26 and position upper end of log 6 into
notched area on front of log 2 as shown
in Figure 26.
As an option to enhance the look of the hearth,
you may place lava rock provided around front
and sides of burner.
NOTICE: Do not put lava rock
insidetheburnerpanoraround
theairmixertting.Placinglava
rock inside the burner pan or
blockingtheopeningsofthepro-
pane/LPairmixercouldcause
performanceproblems.
Figure 23 - Installing Logs 1 and 2
Log 1
Log 2
Notch
Figure 24 - Installing Logs 3 and 4
Log 3
Log 4
Log 2
Log 1
Notches
Figure 25 - Installing Logs 5 and 6
Log 5
Log 6
Log 4
Notch
Notch
Figure 26 - Logs Installed for M36, M36P,
VM36 and VM36P Models

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108796-01T 15
INSTALLATION
Continued
LOG PLACEMENT FOR MODELS
M42E,M42EP,VME42ANDVM42EP
1. Place large back log (log 1) onto grate
making sure notches rest over grate (see
Figure 27).
2. Insert lower end of log 2A between rst
two grate ngers and position upper end
into notch on front of log 1. See Figure 27.
Place log 2B on front right side of grate as
shown in Figure 27.
3. Place log 3 into notch on top left of log 1,
resting lower end on left two grate ngers
(see Figure 28).
4. Place upper end of log 4 into notch on
log 1 as shown in Figure 28. Rest lower
end of log 4 on the middle grate nger as
shown in Figure 29.
5. Place upper end of log 5 into notch on top
inner right of log 1 (see Figure 29). Rest
lower end of log 5 on middle grate nger
as shown in Figure 30.
6. Place log 6 into notch on top right of log
1 (see Figure 29). Rest lower end of log
6 on top of log 2B (see Figure 30).
As an option to enhance the look of the hearth,
you may place lava rock provided around front
and sides of burner pan.
NOTICE: Do not put lava rock
insidetheburnerpanoraround
theairmixertting.Placinglava
rock inside the burner pan or
blockingtheopeningsofthepro-
pane/LPairmixercouldcause
performanceproblems.
Figure 27 - Installing Logs 1, 2A and 2B
Log 2A
Log 2B
Log 1
Notch
Figure 28 - Installing Logs 3 and 4
Log 4
Log 3
Log 1
Notches
Figure 29 - Installing Logs 5 and 6
Figure 30 - Logs Installed for M42E,
M42EP, VM42E and VM42EP Models
Log 6
Log 5
Notch
Log 1
Log 2B

www.desatech.com 108796-01T16
INSTALLATION
Continued
COMBUSTION AIR KIT MODEL AK4
(OPTIONAL)
The outside air kit may be installed on the left
side of replace only. The vent can be installed
through any outside wall a minimum of three
feet below fireplace termination cap. The
handle to operate damper door for outside air
inlet will be located inside left “screen pocket”
of rebox (see Figure 31). Pull handle to open
or push to close.
CAUTION: Air inlet ducts are
nottoterminateinatticspace.
Figure 31 - Air Kit Handle Location
Air Kit
Handle
Screen
Pocket
APPLIANCE ENCLOSURE
Before nishing enclosure around appliance,
inspect all joints around outer surround. Any
gaps between nailing anges and framing
should be sealed with noncombustible insula-
tion or caulking.
If appliance is mounted on a raised platform,
it must be a continuous surface and not on
blocks without a solid surface. This will pre-
vent entry of cold air by means of conduction
through the total bottom of appliance (see
Figure 32).
Side
Framing
Side
Framing
Caulk Here Pack Insulation
Figure 32 - Sealing Between Appliance
and Framing
INSTALLING OPTIONAL GLASS
DOOR ACCESSORY
CAUTION: Use only glass
doorscertiedforusewiththis
appliance.
Note: Glass door may be heavy for some
individuals. If this is the case, please request
help if needed.
The M36E, VM36E, M42E and VM42E B-
vent replaces are approved for use with
optional bi-fold glass doors (see Accessories,
page 29). Glass panels may be ordered and
installed anytime after replace installation
is complete.
Follow these steps to install left and right
panels:
1. With handle at the bottom, completely fold
panel on its hinges.
2. With handle facing center of rebox open-
ing, insert lower pivot pin on glass door
panel into hole in pivot plate on bottom edge
of replace opening (see Figure 33).
3. Keeping folded door tilted, slide upper two
pins into guide track found under upper
facial edge of rebox opening.
4. Tilt glass assembly fully vertical until outer
pivot pin snaps into mounting hole in up-
per spring clip (see Figure 33).
5. Once top and bottom pins are secured,
unfold door into the closed position.
Figure 33 - Installing Optional Glass
Door
Spring Clip
Insert Pin Into Spring Clip
Insert Bottom Pivot Pin Into
Pivot Plate and Swing Door
Into Vertical Position
Pivot Plate
Slide Top
Pin Into
Door Track

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108796-01T 17
6. Repeat process for opposite door as-
sembly.
7. To adjust doors, slide them partially open.
Using a screwdriver, loosen hold-down
screws in the spring clip (see Figure 34)
and pivot plate.
8. Close both doors until evenly joined at
the middle and note gap at outer edges
of face.
9. Reopen one door at a time and retighten
upper and lower hold-down screws.
10. Repeat process until both doors are even-
ly joined, spaced and working freely.
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.
The doors may be removed for replacement
or cleaning as follows:
1. Partially open door and press up on upper
spring clip with a screw driver until outer
top pivot pin is free of clip.
2. Fully fold frame assembly and slide upper
edge towards center of rebox opening
until guide pins are free of frame rail (see
Figure 35).
 CAUTION: Always operate
theappliancewiththedoorsei-
ther fully opened or fully closed.
Operating the appliance with
the doors partially open can re-
sultinimproperventingofue
products.
INSTALLATION
Continued
Figure 34 - Adjusting Glass Doors
Spring
Clip
Hold-Down
Screw
Side
Front
Face
Partially
Opened
Door
Figure 35 - Removing Glass Doors
Spring Clip
Press
Spring Clip
to Release
Pivot Pin
Remove Bottom Pin
From Pivot Plate While
Sliding Door Out of the
Upper Track
Pivot Plate
Fold Bi-Fold
Door After
Releasing
Spring Clip
and Slide
Door Out of
Upper Track
OPENING VENT DAMPER
Vent damper must be locked in the full open
position before operating replace. If vent
damper is not open, replace will not light.
CLOSEOPEN
VENT DAMPER MUST BE LOCKED
IN THE FULL OPEN POSITION
TO OPERATE THE APPLIANCE
Figure 36 - Opening Vent Damper

www.desatech.com 108796-01T18
OPERATION
1. STOP! Read the safety information, in
column 1.
2. Turn off all electric power to appliance.
3. Turn wall switch to the OFF position.
4. Fully open glass doors if installed.
5. Remove front refractory brick access
panel.
6. Turn equipment shutoff valve clockwise
to the OFF position (see Figure
37). Do not force.
7. Wait ve (5) minutes to clear out any gas.
Then smell for gas, including near the
oor. If you smell gas, STOP! Follow “B”
in the safety information, above. If you
don’t smell gas, go to the next step.
8. Turn equipment shutoff valve counter-
clockwise to the ON position. Do
not force.
9. Replace front refractory brick access
panel.
10. Fully close glass doors if installed.
11. Turn on all electric power to appliance.
12. Turn wall switch to the ON position.
13. Visually locate pilot. The ignitor should
begin to spark and main burner should
ignite once ame appears at pilot.
• If lighting appliance for the rst time each
season, it may take several attempts
before the supply gas can reach the pilot
and main burners.
• If the appliance will not stay lit after
several attempts, follow the instructions
To Turn Off Gas To Appliance, page 19,
and call your service technician or gas
supplier.
Figure 37 - Turning Equipment Shutoff
Valve to the OFF Position
Equipment
Shutoff Valve
Adjustment
Screw
FOR YOUR SAFETY
READ BEFORE LIGHTING
WARNING: If you do not fol-
lowtheseinstructions exactly,
a re or explosion may result
causingpropertydamage,per-
sonalinjuryorlossoflife.
A. Thisappliancehasapilotwhichmust
be lighted by hand. When lighting
the pilot, follow these instructions
exactly.
B. BEFORE LIGHTING smell all around
the appliance area for gas. Be sure to
smellnexttotheoorbecausesome
gasisheavierthanairandwillsettle
ontheoor.
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neighbor’sphone.Followthe
gassupplier’sinstructions.
•Ifyoucannotreachyourgassupplier,
callthere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,don’ttrytorepairit,callaquali-
edservicetechnicianorgassupplier.
Forceorattemptedrepairmayresultin
areorexplosion.
D. Do not use this appliance if any part
has been under water. Immediately
call a qualied service technician to
inspect the appliance and to replace
any part of the control system and
anygascontrolwhichhasbeenunder
water.
LIGHTING
INSTRUCTIONS
NOTICE: During initial operation
ofnewheater,burninglogswill
giveoffapaper-burningsmell.
Orangeamewillalsobepres-
ent.Opendamperorwindowto
ventsmell.Thiswillonlylasta
fewhours.

www.desatech.com
108796-01T 19
TO TURN OFF GAS
TO APPLIANCE
1. Turn off wall switch.
2. Turn off all electric power to appliance if
service is to be performed.
3. Fully open glass doors if installed.
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.
7. Fully close glass doors if installed.
OPTIONAL REMOTE
OPERATION
Note: The WRC receiver and hand-held re-
mote control kit must be purchased separately
(see Accessories, page 29). Follow installa-
tion instructions on page 10.
OPERATION
Continued
Figure 38 - Pilot
Sensing
Rod
Pilot
Burner
Ignitor
Pilot
Burner
Ignitor/
Sensor
INSPECTING BURNERS
Figure 39 - Correct Pilot Flame Pattern
Figure 40 - Typical Flame Pattern
Sensing
Rod
1. Turn equipment shutoff valve to ON posi-
tion. You can now turn burner on and off
with the hand-held remote control unit.
IMPORTANT: Be sure to press ON/OFF
buttons on hand-held remote control unit
for up to 3 seconds to assure proper
operation.
2. Press the ON/OFF button to turn burner
on and off.
Check pilot ame pattern and burner ame
patterns often.
PILOT ASSEMBLY
The pilot assembly is factory preset for the
proper ame. Alterations may have occurred
during shipping and handling. The pilot is
located on the back right hand side of the
burner.
The ame must envelope 1/4" of top of the
ignitor/sensor and grounding stem.
If your pilot assembly does not meet these
requirements:
• Turn adjustment screw marked PILOT
clockwise to decrease or counterclockwise
to increase the ame to proper size (see
Figure 37, page 19). Do not remove adjust-
ment screw.
• see Troubleshooting, page 22
BURNER FLAME PATTERN
Burner ames will be steady, not lifting or
oating. Flames should go up through the
middle of logset. Flames should not "spill" to
the edges of pan or sides of logset.
Figure 40 shows a typical ame pattern. If
burner ame pattern differs from that de-
scribed:
• turn appliance off (see To Turn Off Gas to
Appliance)
• see Troubleshooting, page 22

www.desatech.com 108796-01T20
CLEANING AND MAINTENANCE
REPLACEMENT PARTS
WARNING: Installation and
repairshouldbedonebyaquali-
edserviceperson.Theappli-
anceshouldbeinspectedbefore
each use and at least annually
by a qualied 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.
WARNING:Thelogscanbe
hot.Handleonlywhencool.
WARNING: Turn off gas and
electricalpowerbeforeservicing
appliance.
 WARNING: Failure to keep
the primary air opening(s) of
theburner(s)cleanmayresultin
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.
• 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.
• Replace ember material periodically as
needed. See Replacement Parts.
Note: Use only original replacement parts.
This will protect your warranty coverage for
parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product. If
they can’t supply original replacement part(s),
call DESA Heating, LLC at 1-866-672-6040.
When calling DESA Heating, LLC, have
ready:
• your name
• your address
• model and serial numbers of your heater
• how heater was malfunctioning
• purchase date
Usually, we will ask you to return the part to
the factory.
PARTS NOT UNDER WARRANTY
Contact authorized dealers of this product. If
they can’t supply original replacement part(s),
call DESA Heating, LLC at 1-866-672-6040 for
referral information. A list of authorized dealers
can be found by visiting www.desatech.com.
When calling DESA Heating, LLC, have
ready:
• model and serial numbers of your heater
• the replacement part number