Comfort Glow CDV37N Quick start guide

DIRECT-VENT FIREPLACE
OWNER’S OPERATION AND INSTALLATION MANUAL
®
CDV37N, CDV37P,
CDV41N, AND CDV41P
Save this manual for future reference.
FOR YOUR SAFETY
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 fire
department.
WARNING:Improperinstallation,
adjustment, alteration, service,
ormaintenancecancauseinjury
orpropertydamage.Refertothis
manual for correct installation
andoperational procedures.For
assistance or additional infor-
mation consult a qualified in-
staller, service agency, or the
gas supplier.
This appliance may be installed in an aftermarket* manufactured (mobile) home, where not prohibited by
state or local codes.
*Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
WARNING: If the information in this manual is not fol-
lowed exactly, a fire or explosion may result causing
property damage, personal injury, or loss of life.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
— Installation and service must
be performed by a qualified
installer, service agency, or the
gas supplier.
— This appliance is for use only
with indicated gas type. It is not
convertible for use with other
gases, unless a certified kit is
used.
REMOTE REQUIRES
TWO 9-VOLT
BATTERIES -
NOT INCLUDED

2
104570
DIRECT-VENT FIREPLACE (NATURAL/PROPANE)
CDV37N/P AND CDV41N/P
SAFETY
INFORMATION
1. This appliance is only for use with the
typeof gas indicatedon therating plate.
Thisappliance isnotconvertibleforuse
with other gases unless a certified kit
is used.
2. For propanefireplace, donot place pro-
pane (LP) supply tank(s) inside any
structure. Locate propane (LP) supply
tank(s) outdoors. To prevent perfor-
mance problems, do not use propane
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 fire department.
4. Never install the fireplace
• in a recreational vehicle
• wherecurtains, furniture, clothing,or
otherflammableobjects areless than
42" from the front, top, or sides of
the fireplace
• in high traffic areas
• in windy or drafty areas
5. This fireplace reaches high tempera-
tures. Keep children and adults away
from hot surfaces to avoid burns or
clothing ignition. Fireplace will remain
hot for a time after shut-down. Allow
surfaces to cool before touching.
6. Carefully supervise young children
whentheyareintheroom withfireplace.
7. Do not modify this fireplace under any
circumstances. Any parts removed for
servicing must be replaced prior to op-
erating fireplace.
8. Turn fireplace off and let cool before
servicing, installing, or repairing. Only
a qualified service person should in-
stall, service, or repair this fireplace.
Have fireplace inspected annually by a
qualified 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 fireplace.
10. Have venting system inspected annu-
ally by a qualified service person. If
needed, have venting system cleaned
or repaired. See Cleaning and Mainte-
nance, page 27.
11. Keep the area around your fireplace
clear of combustible materials, gaso-
line, and other flammable vapor and
liquids. Do not run fireplace where
these are used or stored. Do not place
items such as clothing or decorations
on or around fireplace.
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 fire-
place nameplate.
14. This appliance,when installed, mustbe
electrically grounded in accordance
with local codes or, in the absence of
local codes, with the National Electri-
cal Code, ANS/NFPA 70, or the Cana-
dian Electrical Code, CSA C22.1.
15. Do not obstruct the flow of combus-
tion and ventilation air in any way. Pro-
vide adequate clearances around air
openings into the combustion chamber
alongwithadequate accessibilityclear-
ancefor servicingand properoperation.
16. Do not install fireplace directly on car-
peting, vinyl tile, or any combustible
materialotherthan wood.Thefireplace
must set on a metal or wood panel ex-
tending the full width and depth of the
fireplace.
17. Do notuse fireplaceifany parthas been
exposedtoor underwater. Immediately
call a qualified service person to ar-
range for replacement of the unit.
18. Do not operate fireplace if any log is
broken.
19. Do not use a blower insert, heat ex-
changer insert, or other accessory not
approved for use with this fireplace.
20. Do notoperate fireplacewith glassdoor
removed, cracked, or broken. Do not
operatefireplacewithout screeninplace.
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, oper-
ate, or service this fireplace. Im-
proper use of this fireplace can
causeseriousinjuryordeathfrom
burns,fire,explosions,electrical
shock, and carbon monoxide
poisoning.
WARNING: Any change to
this fireplace or its controls can
be dangerous.
WARNINGS
DANGER: Carbon monoxide
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. The glass door
must be properly seated and sealed. If this
unit is not properly installed by a qualified
service person with glass door properly
seated and sealed, gas leakage can occur.
Carbon Monoxide Poisoning: Early
signsofcarbonmonoxidepoisoningresemble
theflu,withheadaches,dizziness,ornausea.
Ifyouhavethesesigns,thefireplacemaynot
have been installed properly. Get fresh air
at once! Have fireplace inspected and ser-
viced by a qualified service person. Some
people are more affected by carbon monox-
ide than others. These include pregnant
women, people with heart or lung disease or
anemia,thoseundertheinfluenceofalcohol,
and those at high altitudes.
Propane gas and natural gas are both odor-
less.Anodor-makingagentisaddedtoeach
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.Keepthismanualforreference.It
isyourguidetosafeandproperoperationof
this fireplace.

3
104570
OWNER’S MANUAL
PRODUCT
IDENTIFICATION Install and use fireplace with care. Follow
alllocalcodes.Intheabsencetolocalcodes,
use the current National Fuel Gas Code
ANS Z223.1, also known as NFPA 54*
(USA)orthecurrentCAN/CGA-B149[.1or
.2] Installation Codes (Canada).
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
LOCAL CODES
PRODUCT
FEATURES
Operation
This direct-vent fireplace is clean burning
and vents easily through outside walls or
vertically using outside air for combustion.
Heat is generated by both realistic flames
and glowing embers. When used without
the blower accessory, the fireplace requires
noelectricitymaking itidealforemergency
back-up heat.
Piezo Ignitor
This fireplace has a piezo ignitor. This sys-
tem requires no matches, batteries, or other
sources to light fireplace.
Figure 1 - Comfort Glow Direct-Vent Fireplace CDV Series
Glass Door
Assembly
Blower
Adjustment
(Optional
Installation)
ON/OFF/
Remote Switch
Piezo Ignitor Valve
Front Burner
Pilot
Assembly
Log Set
Grate
Assembly
Lava Rock
Glowing Embers
Top Louver
Panel
Lower Louver Panel
Vent Opening
Nailing
Flange Stand-off
Rear
Burner
GLOSSARY OF
TERMS
Chase - A box-like enclosure to protect
ventingfromtheelementswhentheventing
run is on the outside of a structure.
Mastic - A pliable sealent for use around
the vent terminal.
Snorkel Termination - A box that raises
the horizontal termination above ground
level clearances.
Vent Terminal - Mounted on an outside
wallorrooftoseparatetheinletandoutletof
thevent systemandprotect itfromweather.
VinylSidingStandoff- Ametal boxthat
separates the vent cap from vinyl siding.
Wall Thimble/Firestop - A metal plate
used to secure the vent pipe when it passes
through a wall or ceiling.
Screen
Brass Trim
Brass Trim

4
104570
DIRECT-VENT FIREPLACE (NATURAL/PROPANE)
CDV37N/P AND CDV41N/P
Fireplace size D x FW x RW
37" 18 1/2" 37" 14"
41" 18 1/2" 41" 18"
PRE-INSTALLATION
PREPARATION
LOCATION AND SPACE
REQUIREMENTS
Determinethesafest andmost efficientloca-
tion for your Comfort Glow direct-vent fire-
place. Make sure that rafters and wall studs
are not in the way of the venting system.
Choose a location where the heat output is
notaffectedbydrafts,airconditioningducts,
windows or doors. Figure 2 shows some
common locations. Read all venting infor-
mation in this manual. Be aware of all re-
strictions and precautions before deciding
the exact location for your fireplace.
When deciding the location of your fire-
place, follow these rules:
1. Do not connect this fireplace to a chim-
ney flue serving a separate solid-fuel
burning fireplace or appliance.
2. Due to high temperatures, do not lo-
cate this fireplace in high traffic areas
or near furniture or draperies.
3. Proper clearances must be maintained.
4. If your fireplace is to be installed di-
rectly on carpeting, vinyl tile, or any
combustible material other than wood,
it must be installed on a metal or wood
panel extending the full width and
depth of the fireplace. See Figure 3.
20"
34
3
/ 4 "
5/8" for drywall facing
Must maintain a minimum
1" clearance to combustibles
37
1
/ 2 "
41
1
/ 2 "
34
3
/ 4 "
20" Vertical Termination
19" Horizontal Termination
Note: Where two numbers are given the top number is exclusive to the
37" Fireplace and the bottom number is exclusive to the 41" Fireplace
CLEARANCES
Minimum clearances to combustibles for
the fireplace are as follows:
Back, and sides 0"/mm
Perpendicular walls 6" (152mm)
Floor 0"/mm
Ceiling to louver opening 42"(1067mm)
Front 36" (914mm)
Top of Standoffs 0"/mm
See General Venting on page 5 for specific
venting clearances.
FRAMING AND FINISHING
Figures4and 5showtypicalframing ofthis
fireplace.Figure6on page5showsframing
for corner installation. All minimum clear-
ances must be met. Do not install fireplace
directlyoncarpeting,vinyltile,oranycom-
bustiblematerialother thanwood. Thefire-
place must set on a metal or wood panel
extending the full width and depth of the
fireplace.
See Accessories on page 33 for mantel kits
available for this fireplace. If you are using
a separate combustible mantel piece, refer
to Figure 7 on page 5 for proper installation
height. You can install non-combustible
mantels at any height above the fireplace.
Figure 2 - Common Fireplace Locations
Figure 4 - Framing Clearances for Installation Against an Exterior Wall
Figure5-FramingClearancesforTypical
Fireplace Installation
Flush with a wall
Through exterior wall
enclosed in a chase
Corner
installation
Figure 3 - Fireplace Bottom Dimensions
D
RW
FW

5
104570
OWNER’S MANUAL
29"
13"
10
1
/ 4 "
8
3
/ 4 "37"
41" 37
1
/ 2 "
41
1
/ 2 "
58"
9
1
/ 4 "41"
Note : Where two numbers are given the top number
is exclusive to the 37" Fireplace and the bottom
number is exclusive to the 41" Fireplace
Nailing Tabs
PRE-INSTALLATION
PREPARATION
Continued
Figure 6 - Framing Clearances for Corner Installation
Location of Vent Termination
Whenlocatingventtermination,itisimpor-
tant to observe the minimum clearances
shown in Figure 8, page 6. You will avoid
extra framing by positioning your fireplace
against an already existing framing mem-
ber. The sides of the fireplace may be posi-
tioned directly against combustible walls.
*Checkwithlocal codesor withthecurrent
CAN/CGAB149[.1or.2]InstallationCodes
for Canada or the USA Installations follow
the current National Fuel Gas Code, ANS
Z223.1, also known as NFPA 54.
These models are approved for use with
Simpson Dura-Vent 6 5/8" direct-vent pipe
components and terminations as well as
both flex and rigid Comfort Glow vent
components.
Yourfireplaceisapprovedtobeventedeither
through the side wall, or vertically using the
following guidelines:
• OnlyuseComfort GloworSimpsonDura-
Vent GS venting components or kits spe-
cifically approved for this fireplace.
• Minimum clearance between vent pipes
andcombustiblematerials is1" (25 mm),
except where stated otherwise.
• Combustible material may be flush with
the top front of fireplace with a maxi-
mum thichness of 3/4".
• Do not recess venting terminals into a
wall or siding.
• Install horizontal venting with a 1/4" rise
for every 12" of run toward the
termination.
• You may paint the vent terminal with
450ºF (232ºC) heat-resistant paint to co-
ordinate with the exterior finish.
• There must not be any obstruction such
as bushes, garden sheds, fences, decks,
or utility buildings within 24" from the
front of the termination cap.
• Do not locate termination cap where ex-
cessive snow or ice build up may occur.
Be sure to clear vent termination area af-
tersnow fallsto preventaccidental block-
age of venting system. When using snow
blowers, do not direct snow towards vent
termination area.
GENERAL VENTING
C
B
A
DE
FG
Top of Louver Opening
3
2
1
4
5
6
7
Wall
Figure 7 - Clearances for Combustible Mantels
Ref. Mantel Depth Ref. Mantel from Top
of Louver Opening
1 14" (356mm) A 16" (406mm)
2 12" (305mm) B 14" (356mm)
3 10" (254mm) C 12" (305mm)
4 8" (203mm) D 10" (254mm)
5 6" (152mm) E 8" (203mm)
6 4" (101mm) F 6" (152mm)
7 2" (51mm) G 4" (101mm)

6
104570
DIRECT-VENT FIREPLACE (NATURAL/PROPANE)
CDV37N/P AND CDV41N/P
Fixed
Closed Openable Fixed
Closed
Openable
V
V
V
V
VV
V
V
X
X
VX
G
G
J
F
B
B
K
N
H
I
A
N
E
L
D
B
M
A
C
B
V
V
A
G
G
B
TERMINATION CAP AIR SUPPLY INLET GAS METER RESTRICTED AREA
(TERMINATION PROHIBITED)
A = clearance above grade, veranda, porch, deck, or balcony
[*12 inches (305mm) minimum]
B = clearance to window or door that may be opened
[12 inches (305mm) minimum]
C = clearance to permanently closed window [minimum 12 inches
(305mm) recommended to prevent condensation on window]
D = vertical clearance to ventilated soffit located above the terminal
within a horizontal distance of 24 inches (610mm) from the
center-line of the terminal [18 inches (457mm) minimum]
E = clearance to unventilated soffit [12 inches (305mm) minimum]
F = clearance to outside corner (see below)
G = clearance to inside corner (see below)
H = *not to be installed above a meter/regulator assembly within
36 inches (914mm) horizontally from the center-line of the regulator
I = clearance to service regulator vent outlet [*72 inches (1829mm)
minimum]
J = clearance to non-mechanical air supply inlet to building or the
combustion air inlet to any other fireplace [*12 inches (305mm)
minimum]
K = clearance to a mechanical air supply inlet [*72 inches (1829mm)
minimum]
L = † clearance above paved side-walk or a paved driveway located on
public property [*84 inches (2133mm) minimum]
M = clearance under veranda, porch, deck [*12 inches (305mm) minimum ‡]
N = clearance above a roof shall extend a minimum of 24 inches (610mm)
above the highest point when it passes through the roof surface and
any other obstruction within a horizontal distance of 18 inches (457mm)
† vent shall not terminate directly above a side-walk or paved driveway which is located between two
single family dwellings and serves both dwellings*
‡ only permitted if veranda, porch, deck or balconey is fully open on a minimum of 2 sides beneath the floor*
* as specified in CAN/SGAB149 (.1 or .2) Installation Codes (1991) for Canada or for U.S.A. installation follow
the current
National Fuel Gas Code, ANS Z223.1
Note: Local codes or regulations may require different clearances
A = 6" (152mm)
Inside Corner
V
B
E
V
B = 6" (152mm)
C = Maximum depth of 48" (1219mm) for
recessed location
D = Minimum width for back wall of
recessed location -
Combustible - 38" (965mm)
Noncombustible - 24" (610mm)
E = Clearance from corner in
recessed location-
Combustible - 6" (152mm)
Noncombustible - 2" (51mm)
Outside Corner Recessed Location
G
H
G = Combustible 24" (610mm)
Noncombustible 18" (457mm)
Balcony with No Side Wall
V
J
Combustible &
Noncombustible
H = 24" (610mm)
J = 20" (508mm)
Balcony with Perpendicular Side Wall
CDC
Termination Clearances for Buildings with Combustible and Noncombustible Exteriors
Figure 8 - Minimum Clearances for Vent Terminations
GENERAL VENTING Continued

7
104570
OWNER’S MANUAL
WARNING: Read all instruc-
tions completely and thoroughly
before attempting installation.
Failure to do so could result in
serious injury, property damage
or loss of life. Operation of im-
properlyinstalledandmaintained
venting system could result in
serious injury, property damage
or loss of life.
WARNING:Sealallofthecon-
nections with high temperature
silicone(600°F/316°C)everytime
a vent connection is made. Be-
fore joining elbows and pipes,
apply a bead of high temperature
silicone sealant (GE RTV 106/
Loctite RTV 81585) to the end of
the elbow or pipe. High tempera-
turesiliconemustalsobeusedto
re-seal any connections after
maintenance to venting system.
NOTICE: Failure to follow these
instructionswillvoidthewarranty.
INSTALLATION
PRECAUTIONS
Consultlocalbuildingcodesbeforebeginning
the installation. The installer must make sure
to select the proper vent system for installa-
tion. Before installing vent kit, the installer
mustreadthis fireplacemanual and ventkit
instructions.
Only a qualified service person should in-
stall venting system. The installer must fol-
low these safety rules:
• Wear gloves and safety glasses for
protection
• Use extreme caution when using ladders
or when on roof tops
• Be aware of electrical wiring locations
in walls and ceilings
The following actions will void the war-
ranty on your venting system:
• Installation of any damaged venting
component
• Unauthorized modification of the vent-
ing system
VENTING
INSTALLATION
WARNING:Thisgasfireplace
and vent assembly must be
vented directly to the outside.
TheventingsystemmustNEVER
beattachedtoa chimneyserving
a separate solid fuel burning ap-
pliance.Eachgasappliancemust
use a separate vent system. Do
not use common vent systems.
WARNING: Horizontal sec-
tions of this vent system require
a minimum clearance of 2" from
the top of the pipe and 1" mini-
mum to the sides and bottom.
Vertical sections of this system
require a minimum of 1" clear-
ancetocombustiblematerialson
all sides of the pipe.
• Installation of any component part not
manufactured or approved by DESA
International
• Installation other than as instructed by
these instructions
INSTALLATION PLANNING
There are two basic types of direct-vent
installation:
• Horizontal Termination
• Vertical Termination
It is important to select the proper length of
vent pipe for the type of termination you
choose. It is also important to note the wall
thickness.
For Horizontal Termination: Select the
amountof vertical risedesired. Thehorizon-
tal run of venting must have 1/4" rise for
every 12" of run towards the termination.
NOTICE: Treatment of firestops
andconstructionofthechasemay
vary from building type to build-
ing type. These instructions are
not substitutes for the require-
mentsoflocalbuildingcodes.You
must follow all local building
codes .
Note: Wheninstallinginachase,youshould
insulate the chase as you would the outside
walls of your home. This is especially im-
portant in cold climates. Minimum clear-
ance between vent pipes and combustible
materials such as insulation is 1".
After framing the chase (see Framing and
Finishing on page 4) install the vent system
by following the installation instructions.
Installing Vent System in a Chase
A chase is a vertical box-like structure built
to enclose venting that runs along the out-
sideofabuilding.Achaseisnotrequiredfor
such venting.
Continued
WARNING:Neverrunthevent
downward as this may cause ex-
cessive temperatures which
could cause a fire.
You may use one or two 90°elbows in this
ventconfiguration.SeeHorizontalTermina-
tion Configurations on pages 10 and 11.
For Vertical Termination: Measure the
distance from the fireplace flue outlet to the
ceiling. Add the ceiling thickness, the verti-
cal rise in an attic or second story, and allow
for sufficient vent height above the roofline.
You may use one or two 90°elbows in this
ventconfiguration.SeeVerticalTermination
Configurations on pages 13 and 14.
Note: Youmayusetwo45°elbowsinplace
of a 90°elbow. You must follow rise to run
ratios when using 45°elbows.
For two-story applications, firestops are re-
quired at each floor level. If an offset is
needed in the attic, additional pipe and el-
bows will be required.
Youmayuseachasewithaventtermination
with exposed pipe on the exterior of the
house.SeeInstallingVentSysteminaChase,
below.
Your Comfort Glow direct-vent fireplace
hasbeentested fora minimum 3'rise with a
maximum 10" wall thickness. The maxi-
mum horizontal run is 20' with 8' vertical
rise (see Installation for Horizontal Termi-
nation, page 8). The maximum vertical run
is30'(seeInstallationforVerticalTermina-
tion, page 12).
It is very important that the venting system
maintain its balance between the combus-
tion air intake and the flue gas exhaust.
Certain limitations apply to vent configura-
tions and must be strictly followed.

8
104570
DIRECT-VENT FIREPLACE (NATURAL/PROPANE)
CDV37N/P AND CDV41N/P
INSTALLATION FOR
HORIZONTAL TERMINATION
1. Determine the route your horizontal
venting will take. Note: The location
ofthe horizontalvent terminationon the
exterior wall must meet all local and
national building codes and must not be
easily blocked or obstructed.
Snorkel terminations are available for
terminations requiring a vertical rise on
the exterior of the building (see Figures
9 and 10). Snorkel kit CSVK is also
available (see page 15). Follow the
sameinstallation proceduresasusedfor
standard horizontal terminations. If in-
stalling the snorkel termination below
grade(basementapplications), youmust
provide proper drainage to prevent wa-
ter from entering the snorkel termina-
tion (see Figure 10). Do not back fill
around the snorkel termination.
2. Rigid vent pipes and fittings have spe-
cial twist-lock connections. Assemble
the desired combination of pipe and el-
bows to the appliance adaptor with pipe
seamsoriented towardsthewall orfloor.
Twist-lock Procedure: The female
ends of the pipes and fittings have four
locking lugs (indentations). These lugs
willslide straightintomatchingslotson
the male ends of adjacent pipes and fit-
tings. (All connections must be sealed
with high temperature silicone sealant
asspecified inthe secondwarning state-
ment on page 7.) Push the pipe sections
togetherand twistonesectionclockwise
approximatelyone-quarter turnuntil the
sectionsare fully locked.See Figure11,
page 9. Note: Horizontal runs of vent
must be supported every three feet. Use
wall straps for this purpose.
Flexiblevent pipemustbeinstalled with
spacersprings every12". SeeFigure 11,
page9.Allconnectionsmustbe clamped
tightlyand sealedwith hightemperature
silicone sealant as specified in the sec-
ond warning statement on page 7.
VENTING
INSTALLATION
Continued
Figure 10 - Snorkel Termination with Drainage Pipe
Adequate drainage
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
12" Minimum
Figure 9 - Snorkel Termination
,,,,,
,,,,,
,,,,,
,,,,,
Snorkel
12" Minimum
WARNING:Donotrecessvent
terminal into a wall or siding.
Snorkel

9
104570
OWNER’S MANUAL
VENTING
INSTALLATION
Continued
(Framing
Detail)
10"
(254mm)
10"
(254mm)
7
1
/ 2 "
(190mm)
Vent Opening
Combustible Wall
Vent Opening
Non-Combustible Wall
Figure 12 - Vent Opening Requirements Continued
3. Attach vent pipe assembly to the fire-
place. Set fireplace in front of it’s per-
manent location to insure minimum
clearances. Mark the wall for a 10"
square hole (for non-combustible ma-
terial such as masonry block or con-
crete, a 7 1/2" diameter hole is accept-
able). See Figure 12. The center of the
hole should line up with the center-line
of the horizontal rigid vent pipe. Cut a
10"x10" (254mm x 254mm) square
hole through combustible exterior wall
(7 1/2" [190mm] diameter hole if non-
combustible). Frame as necessary (see
Figure 12).
Figure14-InstallingVinylSidingStandoff
Cut Vinyl Siding
Away to Fit
Standoff
Wood Screw
Nut Bolt
Standoff
Vent Cap
Figure 11 - Vent Pipe Connections
Female
Locking
Lugs
Male
Slots
Rigid Vent Pipe Flexible Vent Pipe
Spacer
Spring
4" Clamp
7" Clamp
4" Flex
Pipe
7" Flex
Pipe
Apply Mastic
to All Four Sides
Figure 13 - Installing HorizontalVent Cap
Wood
Screw
Vent Cap
Apply Mastic
to All Four
Sides
WARNING:Donotrecessvent
termination in to any wall. This
will cause a fire hazard.
4. Apply a bead of non-hardening mastic
aroundtheoutside edgeof the ventcap.
Position the vent cap in the center of
the 7 1/2" or 10" hole on the exterior
wall with the arrow on the vent cap
pointing up. Insure proper clearance of
1" to combustibles is maintained. At-
tachthe ventcap withfour woodscrews
supplied (see Figure 13). Note : Re-
place the wood screws with appropri-
atefastenersfor stucco,brick, concrete,
or other types of siding.
For vinyl siding use vinyl siding stand-
offsbetweenventcap andexterior wall.
The vinyl siding standoff prevents ex-
cessive heat from melting the vinyl sid-
ing material. Bolt the vent cap to the
standoff. Apply non-hardening mastic
around outside edge of the standoff in-
stead of the vent cap assembly. Use
wood screws provided to attach the
standoff. See Figure 14.
5. Slide the wall thimble over the vent
pipe before connecting the horizontal
run to the vent cap (see Figure 15).
6. Carefully move the fireplace with vent
assembly attached toward the wall and
insert the vent pipe into the horizontal
termination. The pipe overlap should
be a minimum of 1 1/4".Apply silicone
to the connection. Fasten all vent con-
nections with screws provided. Refer
toFireplace Installation on page 16 for
instructions on securing unit to fram-
ing or floor.
7. Slide the wall thimble against the inte-
riorwallsurface andattach with screws
provided (see Figure 15).
Vent Cap
(Horizontal
Termination)
Interior Wall
Surface
Wall
Thimble
Horizontal
Vent Pipe
Figure 15 - Connecting Vent Cap with
Horizontal Vent Pipe
Screw

10
104570
DIRECT-VENT FIREPLACE (NATURAL/PROPANE)
CDV37N/P AND CDV41N/P
VENTING
INSTALLATION
Continued
Horizontal Venting
Vertical (V) Horizontal (H)
37" min. 17" max.
Figure 16 - Horizontal Termination
Configuration for Rigid Venting
Figure 17 - Horizontal Termination Configuration for Rigid Venting Using One
90 ° Elbow
Figure 18 - Horizontal Termination Using Flexible Venting
HorizontalVenting
Vertical (V) Horizontal (H)
44" min. 29" max.
(30°and 90°only, no vertical pipe)
55" min. 41" max.
(30°elbow, 1' vertical pipe, 90°elbow)
67" min. 60" max.
79" min. 84" max.
96" min. 20' max.
Note: This configuration for use with
corner installation.
Horizontal Venting
See information in
Figures 16 and 17 for
Vertical(V) and
Horizontal(H) maxi-
mums and minimums.
The same amounts
apply for flexible
venting.
CGFVK Vent Kit
Shown (recommended
for use with cabinet
mantels)
CBVK Vent Kit Shown
Horizontal Termination
Configurations
Figures 16 through 20 show different con-
figurations for venting with horizontal ter-
mination. Each figure includes a chart with
vertical minimum/maximum and horizon-
tal maximum dimensions which must be
met. All connections must be sealed with
high temperature silicone sealant as speci-
fied in the second warning statement on
page 7. All horizontal terminations require
1/4" rise per 12" of horizontal run.

11
104570
OWNER’S MANUAL
VENTING
INSTALLATION
Continued
Venting withTwo 90°Elbows
Vertical (V) Horizontal (H1) Horizontal (H1) +
Horizontal (H2)
5' min. 2' max. 6' max.
6' min. 4' max. 12' max.
7' min. 6' max. 18' max.
8' min. 8' min. 20' max.
20' max. 8' max. 20' max.
Venting withTwo 90°Elbows
Vertical (V) Horizontal (H1) +
Horizontal (H2)
5' min. 6' max.
6' min. 12' max.
7' min. 18' max.
8' min. 20' max.
20' max. 20' max.
Figure 19 - Horizontal Termination Configuration for Rigid Venting Using Two 90 ° Elbows
Figure 20 - Horizontal Termination Configuration for Rigid Venting Using Two 90 ° Elbows with Termination at 90 ° with Fireplace
Continued

12
104570
DIRECT-VENT FIREPLACE (NATURAL/PROPANE)
CDV37N/P AND CDV41N/P
4. Connect a section of pipe and extend
up through the hole.
Note: If an offset is needed to avoid
obstructions,youmust supportthe vent
pipe every 3 feet. Use wall straps for
thispurpose(see Figure21). Whenever
possible, use 45°elbows instead of 90°
elbows. The 45°elbow offers less re-
striction to the flow of the flue gases
and intake air.
5. Place the flashing over the pipe
section(s) extending through the roof.
Secure the base of the flashing to the
roof and framing with roofing nails. Be
sure roofing material overlaps the top
edge of the flashing as shown in Figure
21. There must be a 1" clearance from
the vent pipe to combustible materials.
6. Continue to add pipe sections until the
height of the vent cap meets the mini-
mum building code requirements de-
scribed in Figure8 on page 6. Note :You
must increase vent height for steep roof
pitches.Nearbytrees,adjoiningrooflines,
steeppitchedroofs,andother similarfac-
tors may cause poor draft or down-draft-
ing in high winds. Increasing the vent
height may solve this problem.
7. Twist-lock the vent cap onto the last
section of vent pipe and seal with high
temperature silicone sealant as speci-
fied in the second warning statement
on page 7.
Note: If the vent pipe passes through any
occupiedareasabove thefirst floor,including
storage spaces and closets, you must enclose
pipe.Youmayframeandsheetrocktheenclo-
surewithstandardconstructionmaterial.Make
sure and meet the minimum allowable clear-
ances to combustibles. Do not fill any of the
required air spaces with insulation.
Cathedral Ceiling Installation
1. Remove shingles or other roof cover-
ing as necessary to cut the rectangular
hole for the support box. Mark the out-
lineofthe cathedralceiling supportbox
on the roof sheathing using the locat-
ing hole as a center point.
2. Cut the hole 1/8" larger than the sup-
port box outline (see Figure 23, page
13).
INSTALLATION FOR
VERTICAL TERMINATION
1. Determine the route your vertical vent-
ing will take. If ceiling joists, roof
rafters, or other framing will obstruct
the venting system, consider an offset
(see Figure 21) to avoid cutting
loadbearing members. Note: Pay spe-
cial attention to these installation in-
structions for required clearances (air
space) to combustibles when passing
through ceilings, walls, roofs, enclo-
sures, attic rafters, etc. Do not pack air
spaces with insulation.Also note maxi-
mum vertical rise of the venting sys-
tem and any maximum horizontal off-
set limitations. Offsets must fall within
the parameters shown in Figure 8 on
page 6.
2. Set the fireplace in desired location.
Drop a plumb line down from the ceil-
ing to the position of the fireplace exit
flue. Mark the center point where the
vent will penetrate the ceiling. Drill a
small locating hole at this point.
Drop a plumb line from the inside of
the roof to the locating hole in the ceil-
ing. Mark the center point where the
vent will penetrate the roof. Drill a
small locating hole at this point.
Flat Ceiling Installation
1. Cut a 10" square hole in the ceiling us-
ing the locating hole as a center point.
The opening should be framed to
10"x10" (254mm x 254mm) inside di-
mensions, as shown in Figure 12 on
page 9 using framing lumber the same
size as the ceiling joists. If the area
above the ceiling is an insulated ceil-
ing or a room, nail firestop from the
top side. This prevents loose insulation
from falling into the required clearance
space.Otherwise,install firestopbelow
the framed hole. The firestop should be
installed with no less than three nails
per side (see Figure 22).
2. Assemble the desired lengths of pipe
and elbows necessary to reach from the
fireplace flue up through the firestop.
All connections must be sealed with
high temperature silicone sealant as
specified in the second warning state-
ment on page 7. Be sure all pipe and
elbow connections are fully twist-
locked (see Figure 11, page 9).
3. Cut a hole in the roof using the locating
hole as a center point. (Cover any ex-
posed open vent pipes before cutting
hole in roof.) The 10"x10" hole must
be measured on the horizontal; actual
length may be larger depending on the
pitch of the roof. There must be a 1"
clearancefrom thevent pipeto combus-
tible materials. Frame the opening as
shown in Figure 12 on page 9.
VENTING
INSTALLATION
Continued
Figure 21 - Offset with Wall Strap and 45 °
Elbows
45°Elbow
Wall Strap
Roof
Flashing
Ceiling Firestop
Figure 22 - Installing Firestop
If area above is not a room, install
firestop below framed hole.
If area above is a room, install firestop
above framed hole.

13
104570
OWNER’S MANUAL
VENTING
INSTALLATION
Continued
Continued
Figure 23 - Cathedral Ceiling Support
Box Installation
Non-hardening Mastic under all
edges of support box before nailing
Figure 24 - Installed Cathedral Ceiling
Support Box
Vertical Termination Configurations
Figures 25 through 28 show four different configurations for vertical termination. All
connectionsmustbesealedwithhightemperaturesiliconesealantasspecifiedinthesecond
warning statement on page 7.
Venting withTwo 90°Elbows
Vertical (V) Horizontal (H1) +
Horizontal (H2)
5' min. 2' max.
6' min. 4' max.
7' min. 6' max.
8' min. 8' max.
20' max. 8' max.
Figure 25 - Vertical Rigid Venting Configuration Using Two 90 ° Elbows with Two
Horizontal Runs
3. Lower thesupport boxthrough the hole
in the roof until the bottom of the box
extends at least 2" below the ceiling
(see Figure 23). Align the support box
vertically and horizontally using a
level. Temporarily tack the support box
in place through the inside walls and
into the roof sheathing.
4. Using tinsnips,cut thesupport boxfrom
the top corners down to the roofline and
fold the resulting flaps over the roof
sheathing (see Figure 24).Apply a bead
of non-hardening mastic around the top
edges of the support box to make a seal
between the box and the roof. Nail in
place with roofing nails. Remove any
combustible material that might be in-
side of the support box.
5. Complete the cathedral ceiling instal-
lation by following the same proce-
dures outlined in steps 2 through 7 for
Flat Ceiling Installation, page 12 .
Venting with One 90°Elbow
Vertical (V) Horizontal (H)
5' min. 2' max.
6' min. 4' max.
7' min. 6' max.
8' min. 8' max.
20' max. 8' max.
Figure 26 - Vertical Rigid Venting Configuration Using One 90 ° Elbow
Cut hole 1/8" larger than support
box when projected onto roofline
2" minimum below
finished ceiling
Cathedral ceiling
support box
Level

14
104570
DIRECT-VENT FIREPLACE (NATURAL/PROPANE)
CDV37N/P AND CDV41N/P
Vertical Venting
V = 30' max.
Figure 28 - Vertical Rigid Venting
Configuration With No Horizontal Run
VENTING
INSTALLATION
Continued
Venting withTwo 90°Elbows
Vertical (V1) Horizontal (H)
5' min. 6' max.
6' min. 12' max.
7' min. 18' max.
8' min. 20' max.
Note: Vertical (V1) +
Vertical (V2) = 20' max.
Figure 27 - Vertical Rigid Venting Configuration Using Two 90 ° Elbows
CRVF Kit Shown

15
104570
OWNER’S MANUAL
VENTING
INSTALLATION
Continued
HIGH ALTITUDE
INSTALLATION
Your Comfort Glow direct-vent fireplace
has been AGA tested and approved for
elevationsfrom 0-2000feet andCGA certi-
fied for elevations from 0-4500 feet.
Wheninstalling thisfireplace atan elevation
above2000feet (inthe USA), youmay need
to decrease the input rating by changing the
existing burner orifice to a smaller size. Re-
duce input 4% for each 1000 feet above sea
level.Checkwithyour localgascompanyfor
proper orifice size identification.
When installing this fireplace at an eleva-
tion above 4500 feet (in Canada), check
with local authorities.
Consult your local gas company to help de-
termine the proper orifice for your location.
For assistance with any high altitude instal-
lation contact DESA International’s Tech-
nicalServicesDepartment at1-800-DESA-
LOG (1-800-337-2564).
PARTS LISTS FOR VENTING
KITS AND COMPONENTS
Comfort Glow Rigid Venting
Number Description
CBGFVK Basic Ground Floor Rigid
Vent Kit
Includes: 7" x 60°Elbow,
Extended Adjustable Horizon-
tal Termination, Wall Thimble
and 14 Screws
CGFVK Ground Floor Rigid Vent Kit
Includes: 7" x 60°Elbow, 7"
Adjustable Galvanized Coaxial
Pipe (7-12"), Wall Thimble,
Horizontal Termination, RTV
Silicone and 16 Screws
CBVK Basement Rigid Vent Kit
Includes: 7" x 30°Elbow, 7" x 4'
GalvanizedPipe,7"x90°Elbow,7"
AdjustableGalvanizedPipe(7-12"),
Wall Thimble, Horizontal Termi-
nation,RTVSiliconeand20Screws
CBVKA BasementRigidVentKit(Special)
Includes: 7" x 30°Elbow, 7" x 4'
GalvanizedPipe,7"x90°Elbow,
7"AdjustableGalvanizedPipe(7-
12"),RTVSiliconeand20Screws
Number Description
CSVK Snorkel Rigid Vent Kit
Includes:7"x30°Elbow,7" x4'
Galvanized Pipe, 7" x 90°El-
bow, 7" Adjustable Galvanized
Pipe(7-12"),WallThimble,36"
SnorkelTermination, RTVSili-
cone and 28 Screws
CRVF Roof Rigid Vent Kit
Includes:FlueRestrictor,Storm
Collar, 7" x 30°Elbow, 7" x 4'
Galvanized Pipe, 7" x 2' Galva-
nized Pipe, 7" Adjustable Gal-
vanized Pipe (7-12"), Firestop
Support, Roof Flashing, RTV
Silicone, Vertical Termination,
and 26 screws.
CD1000 7" x 12" Galvanized Coaxial
Pipe (Qty 1)
CD1010 7" x 24" Galvanized Coaxial
Pipe (Qty 1)
CD1020 7" x 48" Galvanized Coaxial
Pipe(Qty 1)
CD1030 7" Adjustable (7-12")
Galvanized Coaxial Pipe
(Qty 1)
CD1050 7"x6"GalvanizedCoaxialPipe
(Qty 1)
CD2000 7" x 90°Elbow (Qty 1)
CD2010 7" x 45°Elbow (Qty 1)
CD2020 7" x 30°Elbow (Qty 1)
CD2030 7" x 60°Elbow (Qty 1)
CD3000 Wall Strap/Offset Support
(Qty 1)
CD3010 Storm Collar (Qty 1)
CD3020 Wall Thimble (Qty 1)
CD3050 Vertical Restrictor (Qty 1)
CD3060 Ceiling Firestop/Support
(Qty 1)
CD3070 Rectangular Horizontal Rigid
Vent Termination Cap
CD3090 CathedralCeilingSupport Box
CD4000 Roof Flashing 6/12-9/12
CD4010 Roof Flashing 9/12-12/12
CD4020 Flex Connector (Qty 1)
CD4030 Flex Wall Thimble (Qty 1)
CD4040 4" Clamp (Qty 1)
CD4050 7" Clamp (Qty 1)
CD5000 Vinyl Siding Standoff (Qty 1)
Simpson Dura-Vent GS 4" x 6 5/8 "
Number Description
Available from DESA International:
CSD2040 Simpson Dura-Vent GS
30°Elbow (Qty 1)
CSD2050 Simpson Dura-Vent GS
60°Elbow (Qty 1)
Available from Simpson
Dura-Vent Only:
902 7" x 48" Pipe
903 7" x 36" Pipe
904 7" x 24" Pipe
906 7" x 12" Pipe
907 7" x 9" Pipe
908 7" x 6" Pipe
911 7" Adjustable (11"-14 5/8") Pipe
940 Wall Thimble
941 Cathedral Ceiling Support Box
943 Roof Flashing 0/12-6/12
943S Roof Flashing 7/12-12/12
945 7" x 45°Elbow
950 Vinyl Siding Standoff
953 Storm Collar
963 Ceiling Firestop
981 36" Snorkel Termination
984 Horizontal Termination Vent Cap
988 Wall Strap
990 7" x 90°Elbow
991 Vertical High Wind Termination
Comfort Glow Flexible Venting
Number Description
CBFGFVKBasicFlexGroundFloorVentKit
Includes: Flex Adapter, 7" x 2'
Flexible Pipe, 4" x 2' Flexible
Pipe, Wall Thimble, Horizontal
Termination,(2)SpacerSprings,
(2)4"HoseClamps,(2) 7"Hose
Clamps, and 10 Screws
CFGFVK Flex Ground Floor Vent Kit
Includes: Flex Adapter, 7" x 4'
Flexible Pipe, 4" x 4' Flexible
Pipe, Wall Thimble, Horizontal
Termination,(4)SpacerSprings,
(2)4"HoseClamps,(2) 7"Hose
Clamps, RTV Silicone, and
10 Screws
CD1040 7" x 25' Coaxial Flex Pipe with
Spacer Springs
CD3080 Rectangular Horizontal Flex
Termination Cap
Comfort Glow Rigid Venting
(Cont.)

16
104570
DIRECT-VENT FIREPLACE (NATURAL/PROPANE)
CDV37N/P AND CDV41N/P
INSTALLING OPTIONAL
BLOWER ACCESSORY
IMPORTANT :Forclarity,gasvalveassem-
blyandgrate/burnerassemblyarenotshown
inFigures30through33,page17.Theywill,
however, be in your fireplace when you are
installing the blower. Also for clarity the
firebox is shown with dotted lines.
1. Open lower louver panel or remove for
easier access.
2. Place the blower against the lower rear
wall of firebox outer wrapper with the
exhaustportdirected upward.Alignthe
holes in the top mounting tabs of
blower with holes in wall of wrapper
(see Figure 30, page 17). Using the two
screws provided, mount blower and
tighten screws securely.
Note: For DA3610T, make sure the
thermal switch is comfortably between
the back of the firebox and the blower
as shown in Figure 31, page 17.
3. Be sure to securely attach all wire ter-
minals to terminals on blower motor
(and thermal switch where applicable)
and that the screw retaining the green
ground wire is tight.
4. Remove screws securing the plate con-
taining the ON/OFF switch to the bot-
tom of the firebox and set aside.
5. Place speed control against back of this
plate and push the plastic control shaft
throughopening(seeFigure32,page17).
6. While supporting speed control, secure
controlshaftwithlocknutbypushingand
turning lock nut with pliers clockwise
untiltight against theplate. Placecontrol
knob provided onto shaft (see Figure 32,
page 17).
7. Replace plate containing switches and
tighten screws securely.
NOTICE:Ifinstallingblowerinan
existing fireplace with gas con-
nections,shutoffgassupplyand
disconnect heater from gas sup-
ply. Contact a qualified service
person to do this.
CHECK GAS TYPE
Use proper gas type for the fireplace unit
you are installing. If you have conflicting
gas types, do not install fireplace. See re-
tailer where you purchased the fireplace for
properfireplaceaccording toyour gastype.
FIREPLACE
INSTALLATION
NOTICE: This heater is intended
foruseassupplementalheat.Use
this heater along with your pri-
mary heating system. Do not in-
stall this heater as your primary
heatsource.If you haveacentral
heating system, you may run
system’scirculatingblowerwhile
usingheater.Thiswillhelpcircu-
late the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
NOTICE: A qualified service per-
sonmustinstallfireplace.Follow
all local codes.
CAUTION: This fireplace cre-
ateswarmaircurrents.Thesecur-
rents move heat to wall surfaces
next to fireplace. Installing fire-
place next to vinyl or cloth wall
coverings or operating fireplace
where impurities (such as to-
bacco smoke, aromatic candles,
cleaning fluids, oil or kerosene
lamps, etc.) in the air exist, may
discolor walls.
Note: Your fireplace is designed to be used
inzeroclearanceinstallations.Wallorfram-
ing material can be placed directly against
anyexteriorsurfaceontherear,sides,ortop
of your fireplace, except where stand-off
spacers are integrally attached. If stand-off
spacers are attached to your fireplace, these
spacers can be placed directly against wall
or framing material. See framing details on
page 4.
Place the fireplace into position and shim
with non-combustible material if needed.
Nailthesideflangestotheframingtosecure
the unit in place. There are two floor brack-
ets included with each unit. Use these as an
alternativemethodofsecuringthefireplace.
IMPORTANT: Makesurefireplaceis level
before securing. If fireplace is not level it
will not work properly.
Attaching Thermal Switch to
CDA3620T Thermostatically
Controlled Blower
When installing the CDA3620T thermo-
statically controlled blower accessory, you
must first secure the thermal switch to the
blower.
1. Remove thetwo hexhead screwson the
blowerassembly asshown inFigure 29.
2. Place the green wire between the bot-
tom hole on the thermal switch bracket
and the bottom hole on the blower as-
sembly. Insert one of the hex screws
into all three pieces and tighten.
3. Insert the top screw through the ther-
mal switch bracket and into the blower
assembly. Tighten screw.
4. Connect the blue wire on the blower
assembly to the right side of the ther-
mal switch.
5. Connect the black wire to the left side
of the thermal switch.
Installing GA3750/CDA3620T
Blowers
Figure 29 - Attaching Thermal Switch to DA3610T Thermostatically Controlled
Blower Accessory
Blower Assembly
Blue Wire
Green Wire
Black Wire
White Wire
Hex Head
Screws
Thermal Switch
with Bracket

17
104570
OWNER’S MANUAL
FIREPLACE
INSTALLATION
Continued
WARNING: Never touch the
blower wheel while in operation.
10. Peel off the backing paper and stick the
supplied wiring diagram decal on the
firebox bottom approximately 3" to the
right of the blower speed control
bracket (Figure 33).
WARNING:Failuretoposition
the parts in accordance with sup-
plied diagrams or failure to use
only parts specifically approved
withthisheatermayresultindam-
age or personal injury.
11. Connector reconnectgas supplyto fire-
place per Connecting Fireplace to Gas
Supply on page 19 of this manual.
8. Plug in blower power cord.
a. Ifyour fireplace systemisinstalled
as a freestanding unit with an ac-
cessory mantel, determine whether
the power cord will exit the left side
or the right side of the firebox. In-
stall one plastic bushing provided
into the 1 1/2" hole in the outer cas-
ing through which the power cord
will exit. Install the second plastic
bushing provided into the floor sup-
port bracket if exiting through the
right side (see Figure 33). Route
power cord through (both) plastic
bushing(s) and plug the power cord
into a properly grounded 3-prong
wall receptacle near the firebox.
b.If yourfireplacesysteminstallation
is recessed and/or pre-wired, a
qualifiedinstaller mustmake allelec-
trical connections for the outlet kit
included with the fireplace.
Figure 30 - Mounting Blower to Firebox
Top
Mounting
Tab
Exhaust Port
NOTICE: A qualified service per-
son must connect fireplace to
gassupply.Followalllocalcodes.
ScrewsBlower Lower Louver
Panel
Lower Rear
Wall of
Firebox
Wrapper
Figure 31 - Locating Thermal Switch Against Back of Firebox
Thermal Switch
Figure 32 - Attaching Speed Control to Firebox
Control
Knob
Locknut Control Shaft
Plastic
Bushing
Figure 33 - Installing Plastic Bushing and Wiring Diagram Sticker
Wiring
Diagram
Continued
Speed
Control
9. Check tomake surethatthe powercord
is completely clear of the blower wheel
and that there are no other foreign ob-
jects in blower wheel. Turn blower on
and check for operation. Turn blower
offby rotatingknob fullycounterclock-
wise before continuing.
Blower
Speed
Control
Bracket

18
104570
DIRECT-VENT FIREPLACE (NATURAL/PROPANE)
CDV37N/P AND CDV41N/P
Figure 35 - Gas Connection
* The A.G.A. design-certified manual shutoff valve may be supplied with the appliance
or you can purchase it from your retailer.
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
yourlocalcodes.Usepipeof1/2"
diameter or greater to allow
propergasvolumetofireplace. If
pipe is too small, undue loss of
pressure will occur.
Installation must include a manual shutoff
valve, union, and plugged 1/8" NPT tap.
Locate NPT tap within reach for test gauge
hook up. NPT tap must be upstream from
fireplace (see Figure 35).
For propane connections only, the installer
must supply an external regulator. The ex-
ternal regulator will reduce incoming gas
pressure. You must reduce incoming gas
pressure to between 11 and 14 inches of
water. If you do not reduce incoming gas
pressure, heater regulator damage could
occur. Install external regulator with the
vent pointing down as shown in Figure 34.
Pointing the vent down protects it from
freezing rain or sleet.
FIREPLACE
INSTALLATION
Continued
INSTALLING GAS PIPING TO
FIREPLACE LOCATION
Installation Items Needed
Before installing fireplace, make sure you
have the items listed below.
• external regulator (supplied by installer)
• piping (check local codes)
• sealant (resistant to LP/propane gas)
• manual shutoff valve *
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
• approved flexible gas line with gas con-
nector (if allowed by local codes) (not
provided)
* AnA.G.A.design-certifiedmanualshutoff
valve with 1/8" NPT tap is an acceptable
alternative to test gauge connection. Pur-
chase the A.G.A. design-certified manual
shutoff valve from your retailer.
NOTICE: A qualified service per-
son must connect fireplace to
gassupply.Followalllocalcodes.
CAUTION:Forpropaneunits,
never connect heater directly to
the propane supply. This heater
requiresanexternalregulator(not
supplied). Install the external
regulatorbetweentheheaterand
propane supply.
CAUTION:Usepipejointseal-
ant that is resistant to liquid pe-
troleum (LP) gas.
Figure 34 - External Regulator with Vent
Pointing Down (Propane Only)
Propane
Supply
Tank
External
Regulator
Vent
Pointing
Down
Install sediment trap/drip leg in supply line
as shown in Figure 35. Locate sediment
trap/drip leg where it is within reach for
cleaning. Locate sediment trap/drip leg
where trapped matter is not likely to freeze.
A sediment trap traps moisture and con-
taminants.This keeps themfrom goinginto
fireplace gas controls. If sediment trap/drip
leg is not installed or is installed wrong,
fireplace may not run properly.
A.G.A. Design-Certified
Manual Shutoff Valve with
1/8" NPT Tap*
3" Minimum
LP - From External
Regulator (11" W.C. to
14" W.C. Pressure)
Approved Flexible
Gas Line
Cap Pipe Nipple Tee Joint
Sediment Trap/Drip Leg
Natural - From Gas
Meter (5" W.C. to 10.5"
W.C. Pressure )
Check your building codes for any special
requirements for locating manual shutoff
valve to fireplaces.
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
fromgoing intopipe.Excesssealantin pipe
could result in clogged fireplace valves.

19
104570
OWNER’S MANUAL
Pressure Testing Gas Supply
Piping System
TestPressuresInExcessOf1/2PSIG
(3.5 kPa)
1. Disconnect fireplace and its individual
manual shutoff valve from gas supply
piping system. Pressures in excess of 1/2
psig (3.5 kPa) will damage fireplace gas
regulator.
2. Cap off open end of gas pipe where
manual shutoff valve was connected.
CHECKING GAS
CONNECTIONS
WARNING: Test all gas pip-
ing and connections for leaks
after installing or servicing. Cor-
rect all leaks at once.
WARNING:Neveruseanopen
flame to check for a leak. Apply
commercial leak test solution to
all gas joints. Bubbles forming
show a leak. Correct all leaks at
once.
Installation Items Needed
• 5/16" hex socket wrench or nut-driver
• sealant (resistant to propane/LP gas, not
provided)
1. Open lower louver door panel by gen-
tly pulling forward.
2. Route flexible gas line (provided by
installer) from manual shutoff valve to
fireplace.Route flexible gassupply line
through one of the access holes on side
of fireplace.
3. Attach a 45°flare union gas connector
toflexiblegas linefrom gassupply(see
Figure 36). Connect flare union to flex-
ible gas line attached to gas regulator
of fireplace (see Figure 36).
4. Check allgas connectionsfor leaks.See
Checking Gas Connections.
CONNECTING FIREPLACE
TO GAS SUPPLY
FIREPLACE
INSTALLATION
Continued
Flare Union
To Fireplace
Gas Valve
Flexible Gas Line from
Fireplace Gas Valve
Provided with Fireplace Flexible Gas Line from
Manual Shutoff Valve
Provided by Installer
Manual Shutoff Valve
To Gas
Supply
Figure 36 - Attaching Flexible Gas Lines Together
Continued
3. Pressurize supply piping system by ei-
ther opening propane/LP supply tank
valve for propane/LP gas fireplace or
openingmaingasvalve locatedonornear
gas meter for natural gas fireplace, or
using compressed air.
4. Check all joints of gas supply piping
system. Apply commercial leak test
solutiontoall gasjoints. Bubbles form-
ing show a leak. Correct all leaks at
once.
5. Reconnect fireplaceand manualshutoff
valvetogas supply. Checkreconnected
fittings for leaks.

20
104570
DIRECT-VENT FIREPLACE (NATURAL/PROPANE)
CDV37N/P AND CDV41N/P
FIREPLACE
INSTALLATION
Continued
TestPressuresEqualToorLessThan
1/2 PSIG (3.5 kPa)
1. Close manual shutoff valve (see Fig-
ure 37).
2. Pressurize supply piping system by ei-
ther opening propane/LP supply tank
valve for propane/LP gas fireplace or
openingmaingasvalve locatedonornear
gas meter for natural gas fireplace, or
using compressed air.
3. Check all joints from propane/LP sup-
ply tank or gas meter to manual shutoff
valve (see Figure 38 for propane/LP or
Figure 39 for natural).Apply commer-
cial leak test solution to all gas joints.
Bubbles forming show a leak. Correct
all leaks at once.
Pressure Testing Fireplace Gas
Connections
1. Open manual shutoff valve (see Fig-
ure 37).
2. Open propane/LPsupply tankvalvefor
propane/LPfireplace or main gasvalve
located on or near gas meter for natu-
ral gas fireplace.
3. Make sure control knob of fireplace is
in the OFF position.
4. Check all joints from manual shutoff
valve to thermostat gas valve (see Fig-
ure 38 for propane/LP or Figure 39 for
natural). Apply commercial leak test
solution to all gas joints. Bubbles form-
ingshowa leak.Correctall leaksat once.
5. Light fireplace (see Operating Fire-
place,pages 25and 26).Check allother
internal joints for leaks.
6. Turn off fireplace (see To Turn Off Gas
to Appliance, page 25).
Figure 37 - Manual Shutoff Valve
ON
POSITION
OFF
POSITION
Open
Closed
Manual
Shutoff
Valve
Figure 39 - Checking Gas Joints for Natural Gas Fireplace
Figure 38 - Checking Gas Joints for Propane/LP Gas Fireplace
Gas Meter
Gas Valve
Manual
Shutoff
Valve
Propane Supply Tank
Gas Valve
Manual
Shutoff
Valve