Vermont Casting 36LDVT, 43LDVT, 3LDVT, 39LDVT User Manual
CER TIF IED
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Builder Top Vent
Direct Vent
Models: 33LDVT, 36LDVT
39LDVT, 43LDVT
INSTALLER/CONSUMER
SAFETY INFORMATION
PLEASE READ THIS MANUAL
BEFORE INSTALLING AND USING
APPLIANCE
WARNING!
IF THE INFORMATION IN THIS
MANUAL IS NOT FOLLOWED
EXACTLY, A FIRE OR EXPLOSION
MAY RESULT CAUSING
PROPERTY DAMAGE, PERSONAL
INJURY OR LOSS OF LIFE.
FOR YOUR SAFETY
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
WHAT TO DO IF YOU SMELL GAS:
Installation Instructions and
Homeowner’s Manual
• 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 your neighbor’s phone. Follow
the gas suppliers instructions.
• If you cannot reach your gas
supplier call the fire department.
DO NOT STORE
OR USE GASOLINE OR OTHER
FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF THIS
OR ANY OTHER APPLIANCE.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
10007852 5/07 Rev. 9
LDVT Series Direct Vent Gas Fireplace
Table of Contents
PLEASE READ THE INSTALLATION & OPERATING INSTRUCTIONS BEFORE USING THIS APPLIANCE.
Thank you and congratulations on your purchase of a CFM Corporation fireplace.
IMPORTANT: Read all instructions and warnings carefully before starting installation.
Failure to follow these instructions may result in a possible fire hazard and will void the warranty.
Installation & Operating Instructions
Important Curing/Burning Instructions .................................................................................3
Fireplace Dimensions ..........................................................................................................4
Locating Your Fireplace ....................................................................................................... 5
Clearance to Combustibles .................................................................................................5
Mantels ...............................................................................................................................5
Hearth ............................................................................................................................... 6
Framing & Finishing ............................................................................................................6
Final Finishing .....................................................................................................................6
Gas Specifications ............................................................................................................... 6
Gas Inlet and Manifold Pressures .......................................................................................6
High Elevations ...................................................................................................................7
Gas Line Installation ............................................................................................................7
Remote Switch Installation .................................................................................................. 7
Alternate Switch Location ....................................................................................................7
EB-1 Electrical Box .............................................................................................................. 8
Electronic Gas Control Valve .............................................................................................. 8
General Venting Information
General Venting Information-Termination Location .......................................................... 10
General Information on Assembling Vent Pipes ................................................................ 11
How to Use the Vent Graph...................................... .........................................................12
Vertical Sidewall Applications & Installation ......................................................................12
Below Grade Installations.. ................................................................................................ 16
Vertical Through-the-Roof Applications & Installations ......................................................17
Venting Components .........................................................................................................20
Operating Instructions
Glass Information ..............................................................................................................21
Louvre Removal ................................................................................................................21
Window Frame Assembly Removal ...................................................................................21
Glass Cleaning .................................................................................................................. 21
Installation of Logs, Lava Rock & Ember Material ............................................................ 22
Flame & Temperature Adjustment ..................................................................................... 24
Flame Characteristics ........................................................................................................ 24
Lighting & Operating Instructions ......................................................................................26
Troubleshooting .................................................................................................................28
Fuel Conversion Instructions .............................................................................................30
Maintenance
Cleaning the Standing Pilot Control System .....................................................................31
Replacement Parts ...................................................................................................................... 32
Optional Accessories
Fan Kits .............................................................................................................................35
Wiring Instructions .............................................................................................................36
Ceramic Refractory Kits ....................................................................................................36
Remote Controls ...............................................................................................................36
Optional Trim Kits ..............................................................................................................37
Screen Door Kits ...............................................................................................................37
Filigree Louvre Kit .............................................................................................................37
Warranty ....................................................................................................................................... 39
Energuide ..................................................................................................................................... 40
2
10007852
LDVT Series Direct Vent GaS Fireplace
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Installation & Operating Instructions
This gas fireplace should be installed by a qualified
installer, preferably NFI or WETT (Canada) certified, in
accordance with local building codes and with current CSA-
B149.1 Installation codes for Gas Burning Appliances and
Equipment. For USA Installations follow local codes and/or
the current National Fuel Gas Code. ANSI Z223.1/NFPA 54.
In the Commonwealth of Massachusetts, all gas fitting
and installation of this heater shall only be done by a
licensed gas fitter or licensed plumber.
FOR SAFE INSTALLATION AND OPERATION PLEASE
NOTE THE FOLLOWING:
1. This fireplace gives off high temperatures and should be
located out of high traffic areas and away from furniture and
draperies.
2. Children and adults should be alerted to the hazards of the
high surface temperatures of this fireplace and should stay
away to avoid burns or ignition of clothing.
3. CAUTION: Due to high glass surface temperature chil-
dren should be carefully supervised when in the same
room as fireplace.
must be installed on a metal or wood panel extending the
full width and depth of the fireplace.
12. This fireplace requires adequate ventilation and combustion
air to operate properly.
13. This fireplace must not be connected to a chimney flue
serving a separate solid fuel burning fireplace.
14. When the fireplace is not in use it is recommended that the
gas control valve be left in the OFF position.
15. These units have been approved for bedroom use.
33LDVT / 36LDVT / 39LDVT / 43LDVT
Certified To
ANSI Z21.88-2005 / CSA 2.33-2005
Vented Gas Fireplace Heaters
WARNING: Check with your electronics manufacturer
before installing a television or other electronic device above this fireplace.
This appliance may be installed in an aftermarket
permanently located, manufactured home or mobile home,
where not prohibited by local codes.
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 certified kit is used.
Th e LDV T has been appro ved for m obile home
installations.
4. Under no circumstances should this fireplace be modified.
Parts removed for servicing should be replaced prior to
operating this fireplace again.
5. Installation and any repairs to this fireplace must be per
formed by a qualified installer, service agency or gas supplier. A professional service person should be contacted to
inspect the fireplace annually. More frequent cleaning may
be required due to excess lint and dust from carpeting, bedding material, etc.
6. Control compartments, burners and air passages in this fireplace should be kept clean and free of dust and lint. Make
sure that the gas valve and pilot light are turned off before
you attempt to clean this fireplace.
7. The venting system (chimney) of this fireplace should be
checked at least once a year and if needed your venting
system should be cleaned.
8. Keep the area around your fireplace clear of combustible
materials, gasoline and other flammable vapour and liquids.
This fireplace should not be used as a dry-ing rack for cloth
ing, nor should Christmas stockings or decorations be hung
on or around the fireplace.
9. Under no circumstances should any solid fuels (wood, coal,
paper or cardboard etc.) be used in this fireplace.
10. The flow of combustion and ventilation air must not be obstructed in any way.
11. When the fireplace is installed directly on carpeting, vinyl tile
or any combustible material other than wood, this fireplace
10007852
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IMPORTANT:
PLEASE REVIEW THE FOLLOWING CAREFULLY
Remove any plastic from from parts before turning the
fireplace ON.
It is normal for fireplaces fabricated of steel to give off
some expansion and/or contraction noises during the
start up or cool down cycle. Similar noises are found
with your furnace heat exchanger or car engine.
It is not unusual for your gas fireplace to give off some
odor the first time it is burned. This is due to the curing
of the paint and any undetected oil from the manufacturing process.
Please ensure that your room is well ventilated-open
all windows.
It is recommended that you burn your fireplace for at least
ten (10) hours the first time you use it. If the optional fan
kit has been installed, place the fan switch in the “OFF”
position during this time.
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Proposition 65 Warning: Fuels used in gas, woodburning or oil fired appliances, and the products of
combustion of such fuels, contain chemicals known to
the State of California to cause cancer, birth defects
and other reproductive harm.
California Health & Safety Code Sec. 25249.6
3
LDVT Series Direct Vent Gas Fireplace
F
V - Rough Opening Width
Rough
Opening
Height
Rough
Opening
Depth
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D
A
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B
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Gas Line
Access
Gas Line
Access
Low
Voltage
Electrical
Access
Electrical
Access
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Low
Voltage
Access
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Fireplace Dimensions
Fig. 1 Fireplace specifications and framing dimensions.
Ref. 33LDVT 36LDVT 39LDVT 43LDVT
A 33” (838 mm) 36” (914 mm) 39” (991 mm) 43” (1092 mm)
B 28⁷⁄₈” (733 mm) 34¹⁄₄” (870 mm) 34¹⁄₄” (870 mm) 37” (940 mm)
C 31¹⁄₄” (794 mm) 34¹⁄₄” (870 mm) 37¹⁄₄” (946 mm) 41¹⁄₄” (1048 mm)
D 18³⁄₈” (466 mm) 23” (584 mm) 23” (584 mm) 25³⁄₄” (654 mm)
E 22³⁄₄” (578 mm) 24” (610 mm) 27” (686 mm) 31” (788 mm)
F 14” (356 mm) 16” (406 mm) 16” (406 mm) 16” (406 mm)
G 31³⁄₄” (806 mm) 37” (939 mm) 37” (939 mm) 39³⁄₄” (1010 mm)
H -- -- -- -- -- -- -- --
I 6” (152 mm) 6³⁄₄” (170 mm) 6³⁄₄” (170 mm) 6³⁄₄” (170 mm)
J 4⁵⁄₈” (118 mm) 5⁵⁄₈” (143 mm) 5⁵⁄₈” (143 mm) 5⁵⁄₈” (143 mm)
K 6³⁄₈” (162 mm) 8” (203 mm) 8” (202 mm) 8” (203 mm)
L 8⁷⁄₈” (225 mm) 11⁷⁄₈” (302 mm) 11⁷⁄₈” (302 mm) 11⁷⁄₈” (302 mm)
M 2” (51 mm) 2” (51 mm) 2” (51 mmj) 2” (51 mm)
N 3³⁄₈” (86 mm) 3¹⁄₄” (83 mm) 3¹⁄₄” (83 mm) 3¹⁄₄” (83 mm)
O 4
P 6³⁄₈” (162 mm) 9¹⁄₄” (235 mm) 9¹⁄₄” (235 mm) 9¹⁄₄” (235 mm)
Framing Dimensions
Q 29
R 14¹⁄₂” (368 mm) 16¹⁄₂” (419 mm) 16¹⁄₂” (419 mm) 16¹⁄₂” (419 mm)
S 35
T 50
U 25¹⁄₄” (641 mm) 28¹⁄₈” (714 mm) 30⁷⁄₈” (784 mm) 31¹⁄₄” (794 mm)
V 33¹⁄₂” (851 mm) 36¹⁄₂” (927 mm) 39¹⁄₂” (1003 mm) 43¹⁄₂” (1105 mm)
4
⁵⁄₈” (118 mm) 6³⁄₄” (172 mm) 6³⁄₄” (172 mm) 6³⁄₄” (172 mm)
⁵⁄₈” (753 mm) 35” (889 mm) 35” (889 mm) 37³⁄₄” (959 mm)
³⁄₄” (908 mm) 39³⁄₄” (1010 mm) 43¹⁄₈” (1095 mm) 44¹⁄₈” (1121 mm)
¹⁄₂” (1238 mm) 55¹⁄₄” (1403 mm) 60⁷⁄₈” (1546 mm) 62³⁄₈” (1584 mm)
10007852
Y
E
A
B
C
D
F
Y
B
X
X
Locating Your Fireplace
A B C
D
E
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W
X
Y
Z
Fireplace
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Mantel
Leg
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LDVT Series Direct Vent GaS Fireplace
Top Louvre
Assembly
Fig. 2 Locate gas fireplace.
A - Flat on wall B - Cross corner C - **Island
D - *Room divider E - *Flat on wall corner F - Chase installation
Y - 6” minimum
Note (Fig. 2):
** Island (C) and Room Divider (D) installation is possible as
long as the horizontal portion of the vent system (X) does not
exceed 20’ (6m). See details in manual Venting Section.
* When you install your fireplace in(D) Room divider or (E)
Flat on wall corner positions (Y), a minimum of 6” (152mm)
clearance must be maintained from the perpendicular wall and
the front side edge of the fireplace. See (Y) in Fig. 2.
Clearance to Combustibles
Top of Unit to Ceiling ................................ 36” (914mm)
Appliance
Top ...........................................................
Bottom ......................................................
Side ..........................................................
Back .........................................................
Venting
Concentric sections of DV Vent
Top, bottom & sides ...............................
Mantels
The height that a combustible mantel is fitted above the
fireplace is dependent on the depth of the mantel. This
also applies to the distance between the mantel leg (if
fitted) and the fireplace.
For the correct mounting height and widths refer to
Figures 3a and 3b.
The fitting of a bay window trim kit does not effect
the distances and reference points referred to in the
diagram and chart.
Noncombustible mantels and legs may be installed at
any height and width around the appliance.
When using paint or lacquer to finish the mantel, such
paint or lacquer must be heat resistant to prevent
discoloration.
10007852
0” (0mm)
0” (0mm)
0” (0mm)
0” (0mm)
1” (25mm)
Top of
CFM146
Combustion
Chamber
Mantel Chart
Mantel Shelf Mantel from Top
Ref. or Breast Plate Ref. of Combustion Chamber
Depth 36/39/43 LDVT 33LDVT
V 10” (254 mm) A 17” (432 mm) 16
W 8” (203 mm) B 15” (381 mm) 14
X 6” (152 mm) C 13” (330 mm) 12¹⁄₂” (318 mm)
Y 4” (101 mm) D 11” (279 mm) 10¹⁄₂” (267 mm)
Z 2” (51 mm) E 9” (229 mm) 8
Fig. 3a Combustible mantel minimum installation.
Black
Surround
Face
Side of
Combustion Chamber
Mantel Mantel Leg FromSide
Ref. Leg Depth Ref. of Comb. Opening
F 10” (254 mm) K 11
G 8” (203 mm) L 9
H 6” (152 mm) M 7¹⁄₂” (191 mm)
I 4” (101 mm) N 5¹⁄₂” (140 mm)
J 2” (51 mm) O 3
Fig. 3b Combustible mantel leg minimum installation.
¹⁄₂” (292 mm)
¹⁄₂” (241 mm)
¹⁄₂” (89 mm)
¹⁄₂” (419 mm)
¹⁄₂” (368 mm)
¹⁄₂” (216 mm)
CFM170
5
LDVT Series Direct Vent Gas Fireplace
A
B
Hearth
A hearth is not mandatory but is recommended for
aesthetic purposes. We recommend a noncombustible
hearth which projects out 12” (305mm) or more from the
front of the fireplace.
Cold climate installation recommendation:
When installing this unit against a noninsulated exterior wall or chase, it is
mandatory that the outer walls be insulated
to conform to applicable insulation codes.
Framing and Finishing
Check fireplace to make sure it is levelled
and properly positioned.
To mount the appliance:
1. Choose the location.
2. This unit comes with four (4) flanges pre-mounted
on both sides of the fireplace to allow two different
drywall thicknesses to be used. Flange “A” is for
1/2” drywall while flange “B” is for 5/8” drywall.
3. Bend the desired flanges out 90° on both sides of
the fireplace. Slide the fireplace into the framed
opening until the flanges contact the front surfaces
of the framing. Level the unit and secure it firmly in
place.
Flange Location for Desired Drywall Depth
Flange Drywall
Position Depth
A 1/2” / 13 mm
B 5/8” / 16 mm
Gas Specifications
Max. Min. Air
Gas Input Input Shutter
Model Fuel Control BTU/h BTU/h Adj.
33LDVTRN Nat Millivolt 16,000 11,200 3/16”
Open
33LDVTRP Prop Millivolt 16,000 12,000 Fully Open
33LDVTEN Nat 24V 16,000 11,200 3/16”
Hi/Lo Open
33LDVTEP Prop* 24V 16,000 12,000 Fully Open
Hi/Lo
36LDVTRN Nat Millivolt 19,500 13,650 Top &
Bottom
Hole Half
Closed
36LDVTRP Prop Millivolt 19,500 14,625 Fully Open
36LDVTEN Nat 24V 19,500 13,650 Top &
Hi/Lo Bottom
Hole Half
Closed
36LDVTEP Prop* 24V 19,500 14,625 Fully Open
Hi/Lo
39LDVTRN Nat Millivolt 23,000 16,100 Top &
Bottom
Hole Half
Closed
39LDVTRP Prop* Millivolt 22,500 16,875 Fully Open
39LDVTEN Nat 24V 23,000 16,100 Top &
Hi/Lo Bottom
Hole Half
Closed
39LDVTEP Prop* 24V 22,500 16,875 Fully Open
43LDVTRN Nat Millivolt 26,000 18,200 Top &
Bottom
Hole Half
Closed
43LDVTRP Prop* Millivolt 24,000 18,000 Fully Open
43LDVTEN Nat 24V 26,000 18,200 Top &
Hi/Lo Bottom
Hole Half
Closed
43LDVTEP Prop* 24V 24,000 18,000 Fully Open
Hi/Lo
*Using conversion kit
FP1546
Gas Inlet and Manifold Pressures
Fig . 4 Nailing flanges.
Final Finishing
Noncombustible materials such as brick or tile may be
extended over the edges of the face of the appliance.
DO NOT cover any vent or grille panels.
If a Trim Kit is going to be installed on the fireplace, the
brick or tile will have to be installed flush with the edges
of the appliance.
6
Natural LP (Propane)
Inlet Minimum 5.5” w.c. 11.0” w.c.
Inlet Maximum 14.0” w.c. 14.0” w.c.
Manifold Pressure 3.5” w.c. 10.0” w.c.
10007852
LDVT Series Direct Vent GaS Fireplace
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High Elevations
Input ratings are shown in BTU per hour and are
certified without deration for elevations up to
4,500 feet (1,370m) above sea level.
For elevations above 4,500 feet (1,370m) in USA,
installations must be in accordance with the current ANSI Z223.1/NFPA 54 and/or local codes having jurisdiction.
In Canada, please consult provincial and/or local
authorities having jurisdiction for installations at
elevations above 4,500 feet (1,370m).
Gas Line Installation
When purging gas line, the front window
frame removed.
The gas pipeline can be brought in through the rear
of the fireplace as well as the bottom. Knockouts are
provided on the bottom behind the valve to allow for the
gas pipe installation and testing of any gas connection.
It is most convenient to bring the gas line in from the
rear right side of the valve as this allows fan installation
or removal without disconnecting the gas line.
The gas line connection can be made with properly
tinned 3/8” copper tubing, 3/8” rigid pipe or an approved
flex connector. Since some municipalities have additional local codes, it is always best to con- sult your
local authority and the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 in the USA or the CSA-B149.1 installation codes.
1/2” Gas Supply
1/2” NPT X 1/2” Flare Shut-off Valve
3/8” Flex line
(from valve)
The fireplace valve must not be subjected to any test
pressures exceeding 1/2 psi. Isolate or disconnect this
or any other gas appliance control from the gas line
when pressure testing.
Remote ON/OFF Switch
Installation:
1. Thread the wiring through holes on the end panels
of appliance. Take care not to cut wire or insulation
on metal edges. Route the wire to a conveniently
located receptacle box.
2. Attach the wire to the ON/OFF switch and install the
switch into the receptacle box.
3. Connect the other ends of the wire to the gas control
valve. (Fig. 6)
Remote ON/OFF
Switch or Thermostat or
Remote Control
Gas
Control
Valve
FP1224
Fig. 6 Remote switch wiring diagram.
Alternate Switch Location
The remote switch can be installed on the front/side of
the access door. Simply mount the switch to the bracket
provided and screw the bracket to either side of the
frame, lining up the screws with the pre-punched holes.
(Fig. 7)
FP297A
Fig. 5 Typical gas supply installation.
Always check for gas leaks with a mild
soap and water solution. Do not use an
open flame for leak testing.
The gas control is equipped with a captured screw type
pressure test point, therefore it is not necessary to provide a 1/8” test point up stream of the control.
When using copper or flex connector use only approved
fittings. Always provide a union when using black iron
pipe so that the gas line can be easily disconnected for
burner or fan servicing . See gas specifications for pressure details and ratings.
10007852
FP1024
Fig. 7 Alternate switch location.
Do not wire the remote ON/OFF wall switch
for the gas fireplace to the 120 volt power
supply.
7
LDVT Series Direct Vent Gas Fireplace
OUTSIDE
INSIDE
BACK OF UNIT
EB-1 Electrical Box
The fireplace, when installed, must be electrically connected and grounded in accordance with local codes or, in the absence
of local codes, with the current CSA C22.1
Canadian Electrical Code.
For USA installations follow local codes
and the national electrical code ANSI/
NFPA No. 70.
It is strongly suggested that the wiring of
the EB-1 Electrical Junction Box be carried
out by a licensed electrician.
Ensure that the power to the supply line
has been disconnected before commencing this procedure.
The EB-1 Electrical junction box has been fitted stand
ard on this model to allow for the easy connection of an
optional fan kit.
To connect the EB-1 box to the house electrical supply
follow the steps below.
1. Unscrew retaining screw from EB-1 base plate (Fig.
8) and remove the EB-1 assembly from the appliance.
2. Remove the front cover of the EB box.
3. Remove the plug socket assembly from the EB-1
box.
4. Feed the supply line in through the EB-1 opening in
the side of the appliance and then through the back
of the EB-1 assembly. (Fig. 8)
5. Connect the black wire of the power supply line to
the brass screw (polarized) of the socket assembly.
6. Connect the white wire of the power line to the
chrome screw of the socket assembly.
7. Connect the ground wire of the supply line to the
green screw of the socket assembly.
8. Refit the socket assembly back into the electrical
box and replace the cover plate. Secure the cable
with the clamp on the outside of the EB-1 base
plate and refit the EB-1 assembly to the unit with the
screw removed in step 1.
-
Electrical Box
Retaining Screw
FP580
Fig. 8 EB-1 receptacle.
Electronic Gas Control Valve
This appliance may be fitted with a Synetek ignition
module.
Installation of the remote on/off switch or wall thermostat on electronic ignition units.
1. Thread the wiring through the holes on the side
panels of the appliance. Take care not to cut the wire
or insulation on metal edges. Route the wire to a
conveniently located receptacle box.
2. Attach the wire to the ON/OFF switch and install the
switch into the receptacle box.
3. Connect the white wire from the wall switch or wall
thermostat to the white wire terminal from the electronic module. Connect the black wire from the wall
switch or the red wire from the wall thermostat, to
the red wire terminal from the electronic module.
8
10007852
LDVT Series Direct Vent GaS Fireplace
POWER CORD
CIRCUIT BOARD
ON/OFF SWITCH
OR
WALL THERMOSTAT
VALVE
RED
WHITE
BLUE
YELLOW
PURPLE
BLACK
WHITE
GREEN
PILOT SENSING
PILOT IGNITER
ORANGE
L1
L2
M
O
P
O
Fig. 9 SIT822 Valve with Synetek electronic control wiring diagram.
General Venting
Your fireplace is approved to be vented either through
the side wall, or vertically through the roof.
• Only CFM Corporation venting components spe-
cifically approved and labelled for this fireplace
may be used.
• Vent terminations shall not be recessed into a wall
or siding.
• Horizontal venting which incorporates the twist lock
pipe must be installed on a level plane without an
inclining or declining slope.
• Horizontal venting which incorporates the use of flex
venting shall have an inclining slope from the unit of
1” (25 mm) per 24” (610 mm).
FP1571
There must not be any obstruction such as bushes,
garden sheds, fences, decks or utility buildings within
24” (610 mm) from the front of the termination hood.
Do not locate termination hood where excessive snow
or ice build up may occur. Be sure to check vent termination area after snow falls, and clear to prevent accidental blockage of venting system. When using snow
blowers, make sure snow is not directed towards vent
termination area.
Location of Vent Termination
It is imperative the vent termination be located observing the minimum clearances as shown on the next
page.
*Check with local codes or in absence of same with
CSA-B149.1 Installation Codes (1991) for Canada
or follow the current National Fuel Gas Code, ANSI
Z223.1/NFPA 54 for installations in the USA.
10007852
9
LDVT Series Direct Vent Gas Fireplace
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V
V
V
V
V
V
X
X
X
D
E
B
B
B
C
B
M
B
A
J
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F
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VENT TERMINATION AIR SUPPLY INLET
AREA WHERE TERMINAL IS NOT PERMITTED
H
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Operable
Operable
Fixed
Closed
V
B
INSIDE
CORNER DETAIL
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A
G
N
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CFM145a
General Venting Information - Termination Location
Canadian Installations1 US Installations
2
A = Clearance above grade, veranda, porch, 12” (30cm) 12” (30cm)
deck, or balcony
B = Clearance to window or door that may be 6” (15cm) for appliances 6” (15cm) for appliances
opened < 10,000Btuh (3kW), 12” (30cm) < 10,000 Btuh (3kW), 9”
for appliances > 10,000 Btuh (3kW) and (23cm) for appliances > 10,000
< 100,000 Btuh (30kW), 36” (91cm) Btuh (3kW) and < 50,000 Btuh
for appliances > 100,000 Btuh (30kW) (15kW), 12” (30cm) for
appliances > 50,000 Btuh (15kW)
C = Clearance to permanently closed window 12” (305mm) recommended to 12” (305mm) recommended to
prevent window condensation prevent window condensation
D = Vertical clearance to ventilated soffit located
above the terminal within a horizontal 18” (458mm) 18” (458mm)
distance of 2’ (610mm) from the center
line of the terminal
E = Clearance to unventilated soffit 12” (305mm) 12” (305mm)
F = Clearance to outside corner see next page see next page
G = Clearance to inside corner (see next page) see next page see next page
H = Clearance to each inside of center line 3’ (91cm) within a height of 15’ (5m) 3’ (91cm) within a height of 15’
extended above meter/regulator assembly above the meter/regulator assembly (5m) above the meter/regulator
assy
I = Clearance to service regulator vent outlet 3’ (91cm) 3’ (91cm)
J = Clearance to nonmechanical air supply inlet 6” (15cm) for appliances < 10,000 6” (15cm) for appliances
to building or the combustion air inlet to any Btuh (3kW), 12” (30cm) for < 10,000 Btuh (3kW), 9”
other appliances appliances > 10,000 Btuh (3kW) and (23cm) for appliances > 10,000
< 100,000 Btuh (30kW), 36” (91cm) Btuh (3kW) and < 50,000 Btuh
for appliances > 100,000 Btuh (30kW) (15kW), 12” (30cm) for
appliances > 50,000 Btuh (15kW)
K = Clearance to a mechanical air supply inlet 6’ (1.83m) 3’ (91cm) above if within 10
feet (3m) horizontally
L = Clearance above paved sidewalk or paved 7’ (2.13m)† 7’ (2.13m)†
driveway located on public property
M = Clearance under veranda, porch, deck or 12” (30cm)‡ 12” (30cm)‡
balcony
N = Clearance above a roof shall extend a minimum of 24” (610mm) above the highest point when it passes through the roof
surface, and any other obstruction within a horizontal distance of 18” (450mm).
1 In accordance with the current CSA-B149 Installation Codes
2 In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Codes
† A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings and
serves both dwellings
‡ only permitted if veranda, porch, deck or balcony is fully open on a minimum 2 sides beneath the floor:
NOTE: 1. Local codes or regulations may require different clearances.
2. The special venting system used on Direct Vent Fireplaces are certified as part of the appliance, with clearances tested and
approved by the listing agency.
3. CFM Corporation assumes no responsibility for the improper performance of the appliance when the venting system does not
meet these requirements.
Fig. 10 Vent termination locations.
10
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Outside Corner
Inside Corner
Termination Clearances
Termination clearances for buildings with combustible and noncombustible exteriors.
G =
Combustible
6" (152 mm)
Noncombustible
2" (51 mm)
F =
Combustible
6" (152 mm)
Noncombustible
2" (51 mm)
G
Balcony with no side wall
M =
Combustible &
Noncombustible
12" (305 mm)
M
Balcony with perpendicular side wall
M = 24" (610 mm)
P = 20” (508 mm)
M
F
Alcove Applications*
C
D
C
E
V
V
Combustible &
Noncombustible
V
V
V
E = Min. 6” (152 mm) for
non-vinyl sidewalls
Min. 12” (305 mm) for
vinyl sidewalls
O = 8’ (2.4 m) Min.
O
P
*NOTE: Termination in an alcove space (spaces open only on one side and with an overhang) is permitted with the dimensions
specified for vinyl or non-vinyl siding and soffits. 1. There must be a 3’ (914 mm) minimum between termination caps. 2. All
mechanical air intakes within 10’ (1 m) of a termination cap must be a minimum of 3’ (914 mm) below the termination cap. 3. All
gravity air intakes within 3’ (914 mm) of a termination cap must be a minimum of 1’ (305 mm) below the termination cap.
Fig. 10a Termination clearances.
Canadian Installations:
General Information on Assembling Vent Pipes
The venting system must be installed in accordance
with the current CSA-B149 .1 installation code.
USA Installations:
The venting system must conform with local codes and/
or the current National Fuel Gas code ANSI Z223.1/
NFPA 54.
Only venting components manufactured by CFM Corporation can be used in Direct Vent systems.
Flex Vent Pipes
Before joining the flex vent pipe to the unit, apply a
bead of high temperature sealant* (provided) to the 4”
pipe exiting the fireplace. Secure flex vent pipe in place
with a hose clamp (provided).
*Be sure the flex pipe overlaps at least 1” (25 mm) onto
the collars of the fireplace and termination. If the ter
mination has an internal bead, be sure to overlap and
secure 1” (25 mm) past the bead.
-
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LDVT Series Direct Vent GaS Fireplace
No.
of Caps D
1 3’ (914 mm) 2 x D
2 6’ (1.8 m) 1 x D
3 9’ (2.7 m) 2/3 x D
4 12’ (3.7 m) 1/2 x D
D
= # of Termination caps x 3
Min.
C
= (2 / # termination caps) x D
Max.
* Be sure the vent is actually crushed before proceeding. Apply a tug to be sure the vent will not slip off the
collars.
Repeat process with 7” flex vent pipe. The same procedure must be performed on the vent side.
Hose Clamp
Fig. 11 Apply high temperature sealant to 4” and 7” pipes.
C
Min.
Apply High Temperature
Sealant
Max.
Actual
Actual
Actual
Actual
Actual
584-15
FP1471
11
LDVT Series Direct Vent Gas Fireplace
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
eg: A
eg: B
Twist Lock Pipes
When using CFM Corporation twist-lock pipe it is not
necessary to use sealant on the joints. The only areas
of the venting system that need to be sealed with high
temperature silicone sealant are the sliding joints of any
telescopic vent section used in the system.
To join the twist lock pipes together, simply align the
beads of the male end with the grooves of the female
end, then while bringing the ends together, twist the
pipe until the flange on the female end contacts the
external flange on the male end. It is recommended that
you secure the joints with three (3) sheet metal screws,
however this is not mandatory with twist lock pipe.
To make it easier to assemble the joints we suggest
putting a lubricant (Vaseline or similar) on the male end
of the twist lock pipe prior to assembly.
Vertical dimension from the floor of the fireplace to
the center of the horizontal vent pipe
Male End
Screw Holes
Fig. 12 Twist-lock pipe joints.
How to Use the Vent Graph
The vent chart should be read in conjunction with the
following vent installation instructions to determine the
relationship of the vertical and horizontal dimensions of
the vent system.
1. Determine the height of the center of the horizontal
vent pipe exiting through the outer wall. Using this
dimension on the Sidewall Vent Graph. (Fig. 13)
locate the point intersecting with the slanted graph
line.
2. From the point of this intersection, draw a vertical
line to the bottom of the graph.
3. Select the indicated dimension, and position the
fireplace in accordance with same.
Example A:
If the vertical dimension from the floor of the fireplace
is 11’ (3.4 m) the horizontal run to the face of the outer
wall must not exceed 14’ (4.3 m).
Example B:
If the vertical dimension from the floor of the unit is 7’
(2.14 m), the horizontal run to the face of the outer wall
must not exceed 8¹⁄₂’ (2.6 m).
12
Female End
TWL100
Horizontal dimension from the outside face of the wall to
the center of the fireplace vent flange
Sidewall vent graph showing the relationship between vertical
and horizontal dimensions for a Direct Vent flue system.
Fig. 13 Sidewall venting graph. (Dimensions in feet)
Vertical Sidewall Applications
Since it is very important that the venting system maintain its balance between
the combustion air intake and the flue
gas exhaust, certain limitations as to vent
configurations apply and must be strictly
adhered to.
The vent graph showing the relationship between vertical and horizontal side wall venting will help to determine the various dimensions allowable.
Minimum clearance between vent pipes
and combustible materials is one 1”
(25mm) on top, bottom and sides unless
otherwise noted.
When the vent termination exits through foundations
less than 20” (508mm) below siding outcrop, the vent
pipe must flush up with the siding.
It is always best to locate the fireplace in such a way
that minimizes the number of offsets and horizontal
vent length of vent pipe from the flue collar of the fireplace to the face of the outer wall.
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