Vermont Castings MLDV500 Manual
75D0004 3/13 Rev. 15
75d0004
MLDV cover
75D0004
MLDV Series Gas Fireplace
High Elevations ....................................................... 5
Gas Pressures ........................................................ 5
Gas Specications & Orice Size ........................... 5
........................................ 7
Before You Start ...................................................... 7
Items Required for Installation ................................ 7
Firebox Framing ...................................................... 7
Fireplace Location ................................................... 7
Finishing Material .................................................... 9
Installation Precautions ......................................... 10
Optional Top Vent Application ............................... 11
Vent Pipe Clearances ........................................... 1
Installation Planning .............................................. 13
Horizontal & Vertical Terminations ........................ 13
Termination Location ............................................. 14
Termination Clearances ........................................ 15
How to Use the Vent Graph .................................. 15
Rear Wall Vent Installation .................................... 16
Horizontal w/Vertical Rise Termination Cong. ..... 17
Below Grade Installations ..................................... 0
Vertical Through-the-Roof Applications ................. 1
Installation for Vertical Termination .......................
Flat Ceiling Installation ..........................................
Flex Vent Installation ............................................. 4
Check Gas Type.................................................... 7
Gas Line Installation ............................................. 7
Remote Wall Mounted Switch ............................... 30
Optional Fan/Blower - BLOTBLDV) ...................... 30
For Your Safety ..................................................... 33
Lighting Pilot for the First Time ............................. 33
Lighting Pilot ......................................................... 34
Lighting Burner ...................................................... 35
Junction Box Wiring .............................................. 37
Command Center Wall Installation ........................ 37
Wall Switch Installation ......................................... 37
Signature Command Wiring Diagram ................... 38
BLOTSDVSC ........................................................ 39
BLOTSDV ............................................................. 40
For Your Safety ..................................................... 41
Operating Instructions ........................................... 4
To Turn Off Gas To Appliance ............................... 4
Glass Frame Removal .......................................... 46
Brick Installation .................................................... 46
Optional Eyebrow/Canopy Installation .................. 46
Rockwool Placement ............................................ 47
Log Placement ...................................................... 47
Burner, Pilot and Control Compartment ................ 50
Pilot Flame ............................................................ 50
Burner Flame ........................................................ 50
Vent System .......................................................... 51
Glass Door ............................................................ 51
Logs ...................................................................... 51
Rock Wool ............................................................ 51
Standing Pilot Ignition ........................................... 5
Signature Command System ................................ 54
Firebox Components ............................................. 55
Logs ...................................................................... 56
Standing Pilot Millivolt Control ............................. 57
Signature Command System ................................ 59
Venting Components ............................................. 61
75D0004 3
MLDV Series Gas Fireplace
4. Never install the replace
• in a recreational vehicle
• where curtains, furniture, clothing, or other am-
mable objects are less than 4" from the front, top,
or sides of the replace
• in high trafc areas
• in windy or drafty areas
5. This replace reaches high temperatures. Keep chil-
dren and adults away from hot surfaces to avoid burns
or clothing ignition. Fireplace will remain hot for a time
after shutdown. Allow surfaces to cool before touch-
ing.
6. Young children should be carefully supervised when
they are in the same room as the appliance. Toddlers,
young children and others may be susceptible to
accidental contact burns. A physical barrier is recom-
mended if there are at risk individuals in the house. To
restrict access to a replace or stove, install an adjust-
able safety gate to keep toddlers, young children and
other at risk individuals out of the room and away from
hot surfaces.
7. Do not modify replace under any circumstances. Any
parts removed for servicing must be replaced prior to
operating replace.
8. Turn replace off and let cool before servicing, install-
ing, or repairing. Only a qualied service person should
install, service, or repair the replace. Have burner
system inspected annually by a qualified service
person.
9. You must keep control compartments, burners, and
circulating air passages clean. More frequent clean-
ing may be needed due to excessive lint and dust.
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 50.
11. Keep the area around your replace clear of combus-
tible 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 deco-
rations on or around replace.
Please leave these instructions with the appliance.
Please retain these instructions for future reference
.
This replace is a vented product. This replace must be
properly installed by a qualied service person. The glass
door must be properly seated and sealed. If this unit is not
properly installed by a qualied service person with glass
door properly seated and sealed, combustion leakage
can occur.
Early signs of carbon
monoxide poisoning are similar to the u with headaches,
dizziness and/or nausea. If you have these signs, the re-
place may not have been installed properly. Get fresh air
at once! Have the replace inspected and serviced by a
qualied 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 inuence 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.
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 certied
kit is used.
. 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.
475D0004
MLDV Series Gas Fireplace
1. Do not use this replace to cook food or burn paper or
other objects.
13. Never place anything on top of replace.
14. Do not use any solid fuels (wood, coal, paper, card-
board, etc.) in this replace. Use only the gas type
indicated on rating plate.
15. 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.
16. Do not obstruct the ow of combustion and ventilation
air in any way. Provide adequate clearances around
air openings into the combustion chamber along with
adequate accessibility clearance for servicing and
proper operation.
17. When the appliance is installed directly on carpeting,
tile or other combustible material other than wood
ooring, you must set appliance on a metal or wood
panel or hearth pad extending the full width and depth
of the appliance.
18. Do not use replace if any part has been exposed to
or has been under water. Immediately call a qualied
service technician to inspect the appliance and replace
any part of the control system and any gas control
which as been submerged in water.
19. Do not operate replace if any log is broken.
0. Do not use a blower insert, heat exchanger insert, or
any other accessory not approved for use with this
replace.
1. Do not operate the replace with glass door removed,
cracked, or broken.
Direct Vent type appliances draw all combustion air from
outside of the dwelling through the vent pipe.
These appliances have been tested by CSA and found to
comply with the established standards for DIRECT VENT
GAS FIREPLACE HEATERS in the USA and Canada as
follows:
TESTED TO:
ANSI Z1.88-009 / CSA .33-009 STANDARDS
A manufactured home (USA only) or mobile home OEM
installation must conform with the Manufactured Home
Construction and Safety Standard,
or when such a standard is not applicable, the
, or
.
Nous recommandons que nos
appareils de chauffage au gaz
soient installés et entretenus par
des professionnels qui ont été
accrédités aux È.U. par le National
Fireplace Institute ® (NFI) comme
étant des spécialistes du NFI en
matièred’appareils de chauffage
au gaz.
It is normal for replaces 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 gas replaces to give off some odor
the rst time it is burned. This is due to the manufacturing
process.
It is recommended that you burn your replace for at
least ten (10) hours the rst time you use it. Place the
fan switch in the “OFF” position during this time.
WARNING
!
HOT GLASS WILL
CAUSE BURNS.
DO NOT TOUCH GLASS
UNTIL COOLED.
NEVER ALLOW CHILDREN
TO TOUCH GLASS.
75D0004 5
MLDV Series Gas Fireplace
• This appliance has been certied for use with
either natural or propane gas. See appropriate
data plates.
• This appliance is not for use with solid fuels.
• The appliance is approved for bedroom or bed-
sitting room installations.
• The appliance must be installed in accordance
with local codes if any. If none exist use the cur-
rent installation code. ANSI Z3.1/NFPA 54 in
the USA, CSA B149 in Canada.
• This appliance is mobile home appr-oved.
• The appliance must be properly connected to a
venting system.
• The appliance is not approved for closet or
recessed installations.
Figure 1 -
MLDV Series Fireplace
(Millivolt Control shown)
FP1984
MLDV components
Off/Pilot/On Knob
Hi/Lo Knob
On/Off/RS
Switch
Ignitor
5/8" Nailing
Flange
1/" Nailing
Flange
Insulation Board
FP1984
Input ratings are shown in BTU per hour and are certi-
ed without deration for elevations up to 4,500 feet
(1,370 m) above sea level.
For elevations above 4,500 feet (1,370 m) in USA,
installation must be in accordance with the current
ANSI Z3.1/NFPA 54 and/or local codes having
jurisdiction.
In Canada, please consult provincial and/or local
authorities having jurisdiction for installation at eleva-
tions above 4,500 feet (1,370 m).
Natural Propane (LP)
Inlet Minimum 4.5” w.c. 11.0” w.c.
Inlet Maximum 10.5” w.c. 13.0” w.c.
Manifold Pressure 3.5” w.c. 10.0” w.c.
MLDV500NV Nat. 34,000 ,000 #33
MLDV500PV LP 34,000 7,000 1.8 mm
MLDV500NSC Nat. 34,000 ,000 #33
MLDV500PSC LP 34,000 7,000 1.8 mm
675D0004
MLDV Series Gas Fireplace
Figure 2 -
Fireplace and Framing Dimensions
33” (838 mm)
41” (1041 mm)
36” (914 mm)
750005
DVML MLDV dims
30(6” (784 mm)
206”
(524 mm)
2256M”
(565 mm)
1/2” or 5/8”
Min. Rough
Opening
Height
276QE”
(694 mm)
Min. Rough Opening Width
(4256O” 91080 mm)
Min. Rough
Opening
Depth
50(6”
(1292 mm)
2256M”
(565 mm)
7256O” (1791 mm)
5256M” (1327 mm)
5256M” (1327 mm)
3656M”
(921 mm)
1”
(25 mm)
34”
(864 mm)
9556QE”
(246 mm)
6”
(152 mm)
506M”
(1289 mm)
256O"
(64 mm)
356”
(79 mm)
1456O”
(368 mm)
2”
(51 mm)
386M”
(984 mm)
446”
(1133 mm)
466”
(1184 mm)
156O”
(38 mm)
76”
(187 mm)
Refer to cold climate pilot information on Page 44
for more information on standing pilot vs. intermittent pilot
options.
75D0004 7
MLDV Series Gas Fireplace
Firebox framing can be built before or after the appliance
is set in place. Construct rebox framing following Figure 2
for rebox and framing dimensions. The framing headers
may rest on the top of the rebox standoffs. Do not bring
headers below top of standoffs. When planning your
framing and installation, keep in mind that your gas line will
come in on the right side of the box (as you are facing it)
and your electricity will come in on the left side.
The rebox may be installed directly on a combustible oor
or raised on a platform of an appropriate height. When
the rebox is installed directly on carpeting, tile, or other
combustible material, other than wood ooring, the rebox
shall be installed on a metal or wood panel extending the
full width and depth of the enclosure.
Read this homeowner manual thoroughly and follow all
instructions carefully. Inspect all contents for shipping
damage and immediately inform your dealer if any damage
is found. Do not install any unit with damaged, incomplete,
or substitute parts. Check your packing list to verify that
all listed parts have been received. You should have the
following:
• Fireplace (Firebox and Burner System)
• Log Set
• Rock Wool
• Phillips Screwdriver • Framing Materials
• Hammer • Wall Finishing Materials
• Saw and/or saber saw • Level
• Measuring Tape • Pliers
• Electric Drill and Bits • Square
• Pipe Wrench • Tee Joint
• Caulking Material (noncombustible)
• Fireplace Surround Material (noncombustible)
• Piping Complying with Local Codes
• Pipe Sealant Approved for use with Propane/LPG
(Resistant to sulfur compounds)
Plan for the installation of your appliance. This includes
determining where the unit is to be installed, the vent con-
guration to be used, framing and nishing details, and
whether any optional accessories (i.e. blower, wall switch,
or remote control) are desired. Consult your local building
code agency to ensure compliance with local codes, includ-
ing permits and inspections.
The following factors should be taken into consideration:
• Clearance to side-wall, ceiling, woodwork, and windows.
Minimum clearances to combustibles
• This replace may be installed along a wall, across a
corner, or use an exterior chase. Refer to Figure 3 for
suggested locations.
• Location should be out of high trafc areas and away
from furniture and draperies due to heat from appli-
ance.
• Never obstruct the front opening of the replace.
• Do install in the vicinity where gasoline or other
ammable liquids may be stored.
• Vent pipe routing. See Venting section found in this
manual for allowable venting congurations.
• These units can be installed in a bedroom. See National
Fuel Gas Code ANSI Z33.1/NFPA 54 — (current
edition), the Uniform Mechanical Code — (current edi-
tion), and Local Building Codes for specic installation
requirements.
• These units can be installed in a bathroom.
Y
EAB
C
D
F
Y
X
Figure 3 -
Locate Gas Fireplace
** Island (C) and room divider (D) installation is possible as long as the
horizontal portion of vent system (X) does not exceed 0'. See Install
Horizontal Termination Conguration on Pages 18 and 19.
* When you install your replace in (D) room divider or (E) at on wall
corner positions (Y), a minimum of 6" clearance must be maintained
from perpendicular wall and front of replace.
A Flat on Wall
B Cross Corner
C Island**
D Room Divider*
E Flat on Wall Corner*
F Chase Installation
Y 6" Minimum
875D0004
MLDV Series Gas Fireplace
71” Minimum
Ceiling
12” Max.
Depth
14” Min.
From Opening
6” Min.
to Opening
FP1987
clearances
Figure 4 -
Side Wall and Ceiling Clearances
Side Wall
Combustible
Mantel
Figure 5 -
Mantel clearances.
6"
5"
3"
256O"456O"45°
356O"
1" 156O"
FP1949
mantel clearances
Fireplace
Opening
Wall
Combustible
Material Area
When eyebrow canopy is used, minimum clearance
to combustibles is Z\v" maximum out from replace front
at 7Z\x" minimum from opening. Figure 5a. When eyebrow
is not used, clearances to combustibles is 8" maximum
out from replace front at 10" minimum from opening or
1" maximum out from replace front at 14" minimum from
opening. Figure 5
8” Max.
10”
Min.
756O”
Min.
156O”
Max. 256M” Max.
FP2916
Mantel Clearance
14”
Min.
12” Max.
3/4"
Marble
Combustible
Breastplate
Figure 5a -
Mantel Clearance with Eyebrow Canopy
Eyebrow
Canopy
75D0004 9
MLDV Series Gas Fireplace
The replace must be secured to the oor and/or to framing
studs as shown in Figure 6. Use two () wood screws or
masonry/ concrete screws to secure replace to the oor.
Use four (4) screws to attach replace to framing. The side
nailing anges are 1/" or 5/8" to accommodate different
wall thickness.
FP1989
install fireplace
Figure 6 -
Secure Fireplace to Floor and
Framing Studs
Framing
Screws
Nailing Flange
Insulation Board
FP1989
Any remote wiring (i.e. remote control, wall switch,
and optional fan) must be done prior to nal nishing to
avoid costly reconstruction.
Only noncombustible materials (i.e. brick, tile, slate, steel,
or other materials with a UL re rating of Zero) may be
used to cover the black painted face of the appliance. It is
permissible to bring combustible wall board to the top and
side edges of the black painted face. A 300°F minimum
adhesive may be used to attach facing materials to the
black surface. If joints between the nished wall and the
replace surround are sealed, a 300°F minimum sealant
material (General Electric RTV103 or equivalent) must be
used.
10 75D0004
MLDV Series Gas Fireplace
Consult local building codes before beginning the
installation. The installer must make sure to select the
proper vent system for installation. Before installing vent
kit, the installer must read this replace manual and vent
kit instructions.
Only a qualied installer/service person should install vent-
ing system. The installer must follow these safety rules:
• Wear gloves and safety glasses for protection.
• Use extreme caution when using ladders or when on
rooftops.
• Be aware of electrical wiring locations in walls and
ceilings.
The following actions will void the warranty on your vent-
ing system:
• Installation of any damaged venting component.
• Unauthorized modication of the venting system.
• Installation of any component part not manufactured
or approved by Vermont Castings Group.
• Installation other than permitted by these instruc-
tions.
75D0004 11
MLDV Series Gas Fireplace
The appliance is shipped as a rear vent unit. If the installa-
tion layout requires the unit to be a top vent conguration,
the appliance can be converted by following the steps
below.
When removing and retting the plates and adapter, be
sure the associated gaskets are undamaged and retted
as required.
1. Remove the eight (8) screws securing the ue pipe
adapter to the replace body. Figure 7
. Set the ue pipe adapter aside, complete with the
gasket. Do not damage the gaskets as the adapter and
gasket must be retted.
FP1991
remove screws
Screws
Flue Pipe
Cover
Flue Pipe
Adapter
FP1991
Figure 7 -
Remove 16 screws from Flue Pipe Adapter and
Flue Pipe Cover
FP1992
remove flue pipe
Flue Cover
Screws
Flue Pipe
FP199
Figure 8 -
Remove Flue Pipe
FP1993
replace flue pipe
Screws
Flue Pipe
FP1993
Figure 9 -
Attach Flue Pipe to Top Vent Conguration
3. Remove the eight (8) screws securing the ue pipe cover
to the top of the intake box and remove the cover and
gasket. Figure 7
4. Remove six (6) screws securing the ue pipe to the
back of the intake box and remove the pipe and gasket.
Figure 8
5. Replace the ue pipe to top of rebox. Ensure the gasket
is in place and undamaged. Secure with six (6) screws.
Figure 9
6. Place the ue pipe cover and gasket removed in Step
3 over the ue opening in bottom of the intake box.
7. Ret the ue pipe adapter and gasket to the top of re-
place. Secure the adapter with six (6) screws removed
in Step 1.
1 75D0004
MLDV Series Gas Fireplace
*3” **1”
**1” **1”
**1”
*3”
fP1990
vent pipe clearances
Figure 10 -
Combustible Clearances for Vent Pipe
* A minimum of 3" clearance to the top is required
along horizontal length until ue pipe penetrates
outside wall.
** A minimum 1" clearance to combustibles permitted
all around ue at outside wall
Z\x
FP1990
75D0004 13
MLDV Series Gas Fireplace
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.
Select the amount of vertical rise desired. All horizontal run
of venting must have 1/4" rise for every 1" of run towards
the termination below 71/ feet of vertical rise. With 71/ feet
or more vertical rise off top of replace, the horizontal run
may run level. NEVER run vent piping downward.
You may use up to three 90° elbows in this vent congu-
ration. Refer to Horizontal Termination Congurations on
Pages 17 and 18.
Measure the distance from the replace oor to the ceil-
ing. Add the ceiling thickness, the vertical rise in an attic
or second story, and allow for sufcient vent height above
the roof line.
You may use two 45° elbows in place of a 90° elbow.
You must follow rise to run ratios when using 45° elbows.
The appliance is approved for use with three 90° elbows
maximum or a combination of 90° and 45° elbows up to a
maximum of 70°.
Z\x
For two-story applications, restops are required at each
oor level. If an offset is needed in the attic, additional pipe
and elbows will be required.
You may use a chase with a vent termination with exposed
pipe on the exterior of the house. Refer to Installing Vent
System in a Chase below. If pipe is enclosed in chase, it
is not exposed.
It is very important that the venting system maintain its bal-
ance between the combustion air intake and the ue gas
exhaust. Certain limitations apply to vent congurations
and must be strictly followed.
A chase is a vertical boxlike structure built to enclose
venting that runs along the outside of a building. A chase
is required for such venting.
14 75D0004
MLDV Series Gas Fireplace
V
V
V
V
V
V
V
X
X
X
D
E
B
B
B
C
B
M
B
A
J
K
F
L
VENT TERMINATION AIR SUPPLY INLET AREA WHERE TERMINAL IS NOT PERMITTED
H
I
Fixed
Closed
Operable
Operable Fixed
Closed
V
B
CFM145a
DV Termin Location
5/01/01 Rev. 12/05/01
sta
INSIDE
CORNER DETAIL
V
A
G
CFM145a
A = Clearance above grade, veranda, porch, 1” (30 cm) 1” (30 cm)
deck, or balcony
B = Clearance to window or door that may be 6” (15 cm) for appliances 6” (15 cm) for appliances
opened < 10,000BTU/h (3kW), 1” (30 cm) < 10,000 BTU/h (3kW), 9”
for appliances > 10,000 Btuh (3kW) and (3 cm) for appliances > 10,000
< 100,000 BTU/h (30kW), 36” (91 cm) Btuh (3kW) and < 50,000 BTU/h
for appliances > 100,000 BTU/h (30kW) (15kW), 1” (30 cm) for
appliances > 50,000 BTU/h(15kW)
C = Clearance to permanently closed window 1” (305 mm) recommended to 1” (305 mm) recommended to
prevent window condensation prevent window condensation
D = Vertical clearance to ventilated soft located
above the terminal within a horizontal 18” (458 mm) 18” (458 mm)
distance of ’ (610mm) from the center
line of the terminal
E = Clearance to unventilated soft 1” (305 mm) 1” (305 mm)
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’ (91 cm) within a height of 15’ (5 m) 3’ (91 cm) within a height of 15’
extended above meter/regulator assembly above the meter/regulator assembly (5 m) above the meter/regulator
assy
I = Clearance to service regulator vent outlet 3’ (91 cm) 3’ (91 cm)
J = Clearance to nonmechanical air supply inlet 6” (15 cm) for appliances < 10,000 6” (15 cm) for appliances
to building or the combustion air inlet to any BTU/h (3kW), 1” (30 cm) for < 10,000 BTU/h (3kW), 9”
other appliances appliances > 10,000 BTU/h (3kW) and (3 cm) for appliances > 10,000
< 100,000 Btuh (30kW), 36” (91 cm) BTU/h (3kW) and < 50,000 BTU/h
for appliances > 100,000 BTU/h (30kW) (15kW), 1” (30 cm) for
appliances > 50,000 BTU/h(15kW)
K = Clearance to a mechanical air supply inlet 6’ (1.83 m) 3’ (91 cm) above if within 10'
(3 m) horizontally
L = Clearance above paved sidewalk or paved 7’ (.13 m)† 7’ (.13 m)†
driveway located on public property
M = Clearance under veranda, porch, deck or 1” (30 cm) 1” (30cm)
balcony
1 In accordance with the current CSA-B149 Installation Codes
In accordance with the current ANSI Z3.1/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 sides beneath the oor:
NOTE: 1. Local codes or regulations may require different
clearances.
. The special venting system used on Direct Vent Fireplaces
are certied as part of the appliance, with clearances
tested and approved by the listing agency.
3. Vermont Castings Group assumes no responsibility for the
improper performance of the appliance when the venting
system does not meet these requirements.
Figure 11 -
Horizontal Vent Termina-
tion Locations
75D0004 15
MLDV Series Gas Fireplace
The Vent Graph should be read in conjunction with the
following vent installation instructions to determine the
relationship between 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 dimen-
sion on the Sidewall Vent Graph below, locate the point
intersecting with the slanted graph line.
. From the point of this intersection, draw a vertical line
to the bottom of the graph.
3. Select the indicated dimension, and position the re-
place in accordance with same.
Example: If the vertical dimension from the oor of the
replace is 11' (3.4 m) the horizontal run to the face of
the outer wall must not exceed 14' (4.3 m).
Example: If the vertical dimension from the oor of the
unit is 7’ (2.14 m), the horizontal run to the face of the
outer wall must not exceed 7' (2.1 m).
Sidewall Vent Graph showing the relationship between
vertical and horizontal dimensions for a Direct Vent ue
system. Figure 13 -
Rear Wall Venting Graph
Horizontal dimension from the nished outside wall
to the center of the pipe on the replace
Vertical Dimension From the Floor of Unit to the
Center of the Horizontal Vent Pipe
Dimensions in
Feet
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 = 12" (305 mm)
P = 6” (152 mm)
M
F
Alcove Applications*
C
D
C
E
V
V
Combustible &
Noncombustible
E= Min. 2” (51 mm) for
non-vinyl sidewalls
Min. 12” (305 mm) for
vinyl sidewalls
O= 8’ (2.4 m) Min.
O
P
V
V
V
Figure 12 -
Allowable
Venting
584-15
No.
of Caps DMin. CMax.
1 3’ (914 mm) x DActual
6’ (1.8 m) 1 x DActual
3 9’ (.7 m) /3 x DActual
4 1’ (3.7 m) 1/ x DActual
DMin. = # of Termination caps x 3
CMax. = ( / # termination caps) x DActual
Termination in an alcove space (spaces open only on one side and with an overhang) is permitted with the dimensions specied for vinyl or
non-vinyl siding and softs. 1. There must be a 3’ (914 mm) minimum between termination caps. . 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.
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
2 4 6 8 10 1214 16 1820
eg: A
FP1952
sidewall vent graph
16 75D0004
MLDV Series Gas Fireplace
• Only one 45 degree elbow is allowed in these installa-
tions.
1. Rigid vent pipes and ttings have special twist-lock
connections. Assemble the desired combination of pipe
and elbows to the appliance adapter.
The female ends of the pipes
and ttings have three (3) locking lugs (indentations).
These lugs will slide straight into matching slots on
the male end of adjacent pipes and ttings. Push the
pipe sections together and twist one section clockwise
approximately one-quarter turn until the sections are
fully locked. Figure 15
FP1953
rigid pipe
Female Locking
Lugs
Male Slots
Horizontal runs of
vent must be supported every
three feet (914 mm). Use wall
straps for this purpose.
Figure 15 -
Rigid Vent Pipe Connections
When installed as a rear vent unit, this appliance may be
vented directly to a termination located on the rear wall
behind the appliance. Only an Vermont Castings Group
brand termination is allowed for this application.
• The maximum horizontal distance between the rear
of the appliance and the termination is 0" (508 mm).
Figure 14
DVR584-600
Rear vent no elbows
2/99 djt
Maximum
0"
Top View Flat Installation
Figure 14 - Rear Vent Application,
Maximum Horizontal Distance
FP1954
wall framing
101/"
(67 mm)
101/"
(67 mm)
81/"
(16 mm)
Figure 16 -
Exterior Wall Framing Dimensions
Combustible Wall
Noncombustible
Wall
FP1954
. Refer to venting and termination instructions for further
instructions.
3. Locate and cut the vent opening in the wall. For com-
bustible walls rst frame in opening.
Cut a 11/" x 101/" hole
through the interior wall.
Cut a 101/" x 101/"
square hole through the exterior wall frame. Figure 16
Hole opening should be 81/"
(16 mm) in diameter.
4. The center of the hole should align with the center line
of the horizontal rigid vent pipe end. Allow 1/4" minimum
rise per foot. Figure 16
5. Apply a bead of non-hardening mastic around the
outside edge of vent cap. Position the vent cap in the
center of hole on the exterior wall with the word "UP"
on the vent cap facing up. Insure proper clearance of
1" to combustibles is maintained. Attach the vent cap
with four (4) wood screws supplied. Figure 17
For vinyl siding, stucco or wood exterior, use vinyl
siding standoffs between vent cap and exterior wall for
Duravent or Selkirk Terminations only. The vinyl siding
standoff prevents excessive heat from melting the
vinyl siding material. Vermont Castings Group
Termination does not require standoff. Bolt the vent
cap to the standoff or wall. Apply non-hardening mastic
around outside edge of the standoff instead of the vent
cap assembly. Use wood screws provided to attach the
standoff. Figure 18
75D0004 17
MLDV Series Gas Fireplace
HOT
FP1956
vinyl siding
Cut Vinyl Siding Away
to Fit Standoff
Standoff #150 or
5DT-VS
(Not required for
Vermont Castings
Group termination)
Termination
Bolt
Wood Screw
Nut
Apply Mastic
to all Four
Sides
Figure 18 -
Install Duravent/Selkirk Vinyl Siding Standoff and
Termination
FP1956
FP1957
vent cap w hor pipe
Inerior Wall
Surface
Firestop
Horizontal
Vent Pipe
Screw
Vent Cap
(Horizontal
Termination)
Figure 19 -
Install Firestop on Horizontal Vent Pipe
FP1957
HOT
FP1955
horizontal vent cap
Vent Cap
Wood Screw
Apply Mastic to all
Four Sides
Figure 17 -
Install Horizontal Termination
No other
manufacturer's termination is permitted in
this application.
6. Slide the stop over the vent pipe before connecting the
horizontal run to the vent cap. Figure 19
7. 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 11/4". Apply silicone to the outer pipe
connection. Fasten all vent connections with screws
provided.
8. Slide the wall thimble against the interior wall surface
and attach with screws. Figure 19
The Vent Graph, showing the relationship between vertical
and horizontal side wall venting, will help to determine the
various dimensions allowable. Figure 13
Minimum clearance between vent pipes and combustible
materials is 3" on top and 1" from bottom and sides unless
otherwise noted (Exception: Outside wall with restop: 1"
all around pipes are allowed). If the vertical run is 71/ feet
or more, off the top of the replace, the clearance is 1" on
all sides of the horizontal run.
When vent termination exits through foundations less than
0" below siding outcrop, the vent pipe must be ush with
the siding.
It is best to locate the replace in such a way that minimizes
the number of offsets and horizontal vent length.
18 75D0004
MLDV Series Gas Fireplace
FP1176
max 90 bends
Figure 20 -
Maximum Three (3) 90° Elbows
Per Installation
3 x 90°
Elbows
3 x 90°
Elbows
FP1176
Max 20"
Max 20"
36"
(914 mm)
Max.
36"
(914 mm)
Max.
FP1177
max horizontal run
Figure 21 -
Maximum Horizontal Run with No Rise
FP1177
• If a 90° elbow is used in the horizontal vent run (level
height maintained) the horizontal vent length is reduced
by 36". Figure 23. This does not apply if the 90° elbows
are used to increase or redirect a vertical rise. Figure
22
According to the vent graph (Page 17) the
maximum horizontal vent length in a system with a 7.5'
vertical rise is 20’ (6 m) and if a 90° elbow is required in the
horizontal vent it must be reduced to 17' (5.2 m).
In Figures 22 and 23 dimension A plus B must not be
greater than 17' (5. m).
Figure 23 -
Maximum Vent Run with Elbows
FP1959
A + B = 17' Maximum
Horizontal 90° Elbow = 3' Reduction
7'6"
10' 7'
FP1958
Horizontal run reduction
Figure 22 -
Horizontal Run Reduction
90°
7'6"
FP1958
The horizontal vent run refers to the total length of vent
pipe from the ue collar of the replace (or the top of the
Transition Elbow) to the face of the nished outside wall
or the mounting ange of the termination.
• The maximum number of 90° elbows per side wall
installation is three (3). Figure 20
• If a 90° elbow is tted directly on the top of the replace,
the maximum horizontal vent run before the termination
or a vertical rise is 36” (914 mm). Figure 21
75D0004 19
MLDV Series Gas Fireplace
Example: Elbow 1 = 90°
Elbow = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 70°
Figure 24 -
Maximum Elbow Usage
1 + + 3 + 4 = 70°
1
2
3
4
1
2
3
4
FP1180
• For each 45° elbow installed in the horizontal run, the
length of the horizontal run MUST be reduced by 18"
(457 mm). This does not apply if the 45° elbows are
installed on the vertical part of the vent system.
• The maximum number of elbow degrees in a system is
70°. Figure 24
Cut a 1Z\x"H x 10Z\x" W
hole through the interior wall.
Cut a 10Z\x"H x 10Z\x"W
square hole through the exterior wall frame. Figure 25
Hole opening should be 8Z\x"
(16 mm) in diameter.
. The center of the hole should line up with the center line
of the horizontal rigid vent pipe end. Allow 1/4" minimum
rise per foot. Figure 25
B\,
B\,
B\,
FP1954
wall framing
101/"
(67 mm)
101/"
(67 mm)
81/"
(16 mm)
Figure 25 -
Exterior Wall Framing Dimensions for 5" x 8"
Combustible
Wall
Noncombustible
Wall
FP1954
1. Locate and cut the vent opening in the wall. For com-
bustible walls rst frame in opening.
Cut a 11Z\x"H x 9Z\x" W
hole through the interior wall.
Cut a 9Z\x"H x 9Z\x"W
square hole through the exterior wall frame. Figure 26
Hole opening should be 7Z\x"
(190 mm) in diameter.
. The center of the hole should line up with the center line
of the horizontal rigid vent pipe end. Allow 1/4" minimum
rise per foot. Figure 26
0 75D0004
MLDV Series Gas Fireplace
FP1954
wall framing
91/"
(41 mm)
91/"
(41 mm)
71/"
(190 mm)
Combustible
Wall
Noncombustible
Wall
FP1954
Figure 26 -
Exterior Wall Framing Dimensions
for 4" x 65/8" or 4" x 7"
When it is not possible to meet the required vent terminal
clearances of 1" above grade level, a snorkel kit is recom-
mended. It allows installation depth down to 7" (178 mm)
below grade level. The 7" (178 mm) is measured from the
center of the horizontal vent pipe as it penetrates through
the wall.
If installing a snorkel, a minimum 4" vertical rise is nec-
essary. The maximum horizontal run with the 4” vertical
pipe is 36". This measurement is taken from the collar of
the replace (or transition elbow) to the face of the exterior
wall. Refer to the Sidewall Venting Graph for extended
horizontal run if the vertical exceeds 4".
1. Establish vent hole through the wall.
. Remove soil to a depth of approximately 16" below base
of snorkel. Install drain pipe. Install window well (not
supplied). Rell hole with 1" of coarse gravel leaving
a clearance of approximately 4" below snorkel. Figure
27
3. Install vent system.
4. Ensure a watertight seal is made around the vent pipe
coming through the wall.
5. Apply high temperature sealant caulking (supplied)
around the 5" and 8" snorkel collars.
6. Slide the snorkel into the vent pipes and secure to the
wall.
7. Level the soil so as to maintain a 4" clearance below
snorkel. Figure 27
FP1965
below grade install
Figure 27 -
Below Grade Installation
Screws
Minimum
4" Clearance
Ground
Window Well
Gravel
Drain
Foundation Wall
Firestop
1"
Minimum
FP1965
FP1966
snorkel
Figure 28 -
Snorkel Installation, Recessed Foundation
Foundation
Recess
Watertight Seal
Around Pipe
Sheet Metal
Screws
Wall Screws
Snorkel
FP1966
If the foundation is recessed, use recess brackets (not
supplied) for securing lower portion of the snorkel. Fasten
brackets to wall rst, then secure to snorkel with self drill-
ing #8 x 1/ sheet metal screws. It will be necessary to
extend vent pipes out as far as the protruding wall face.
Figure 28
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