Majestic DVLB7 Series User manual
743000
BLDV 7 cover
74D3001 5/10 Rev. 8
Installation and
Operating
Instructions
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74D3001
DVBL7 Series Gas Fireplace
High Elevations ....................................................... 5
Gas Pressures ........................................................ 5
Gas Specifications & Orifice Size ........................... 5
Fireplace Dimensions & Framing ............................ 6
Before You Start ...................................................... 7
Cold Climate Insulation ........................................... 7
Fireplace Location ................................................... 8
Installation Precautions ......................................... 11
General Venting .................................................... 11
Termination Location ............................................. 1
Assembling Vent Pipes ......................................... 13
How to Use the Vent Graph .................................. 14
Vent Pipe Clearances to Combustibles ................. 15
Vertical Sidewall Applications &
Installation ............................................................. 16
Below Grade Installation ....................................... 18
Vertical Through-the-Roof Applications
& Installation ......................................................... 19
Check Gas Type....................................................
Install Gas Piping to Fireplace/Burner System
Location ................................................................
Electrical Wiring .................................................... 4
BLOTBLDV ........................................................... 6
Lighting Pilot for the First Time ............................. 9
Lighting Pilot ......................................................... 30
Lighting Burner ...................................................... 31
Junction Box Wiring .............................................. 33
Command Center Wall Installation ........................ 33
Wall Switch Installation ......................................... 33
Signature Command Wiring Diagram ................... 34
BLOTSDVSC ........................................................ 35
BLOTSDV ............................................................. 36
Operating Instructions ........................................... 38
To Turn Off Gas To Appliance ............................... 38
Hearth Brick Placement ........................................ 4
Rockwool Placement ............................................ 4
Log Placement ...................................................... 4
Burner, Pilot and Control Compartment ................ 44
Pilot Flame ............................................................ 44
Burner Flame ........................................................ 44
Vent System .......................................................... 45
Glass Door ............................................................ 45
Logs ...................................................................... 45
Rock Wool ............................................................ 45
Standing Pilot Ignition ........................................... 46
Signature Command System ................................ 48
Firebox Components ............................................. 49
Standing Pilot Millivolt Control ............................. 50
Signature Command System ................................ 5
Logs ...................................................................... 54
Venting Components ............................................. 55
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74D3001 3
DVBL7 Series Gas Fireplace
4. Never install the fireplace
• in a recreational vehicle
• where curtains, furniture, clothing, or other flam-
mable objects are less than 4" from the front, top,
or sides of the fireplace
• in high traffic areas
• in windy or drafty areas
5. This fireplace reaches high temperatures. Keep children
and adults away from hot surfaces to avoid burns or
clothing ignition. Fireplace will remain hot for a time after
shutdown. Allow surfaces to cool before touching.
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 acci-
dental contact burns. A physical barrier is recommended
if there are at risk individuals in the house. To restrict
access to a fireplace or stove, install an adjustable
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 fireplace under any circumstances. Any
parts removed for servicing must be replaced prior to
operating fireplace.
8. Turn fireplace off and let cool before servicing, install-
ing, or repairing. Only a qualified service person should
install, service, or repair the fireplace. Have burner
system 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. Turn off
the gas valve and pilot light before cleaning fireplace.
10. Have venting system inspected annually by a
qualified service person. If needed, have venting
system cleaned or repaired. Refer to Cleaning and
Maintenance, Page 44.
11. Keep the area around your fireplace clear of com-
bustible materials, gasoline, 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.
Please leave these instructions with the appliance.
Please retain these instructions for future reference
.
This fireplace is a vented product. 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, combustion leakage can
occur.
Early signs of carbon
monoxide poisoning are similar to the flu with headaches,
dizziness and/or nausea. If you have these signs, the fire-
place may not have been installed properly. Get fresh air
at once! Have the fireplace inspected and serviced by a
qualified service person. Some people are more affected
by carbon monoxide than others. These include pregnant
women, people with heart or lung disease or anemia,
those under the influence of alcohol, and those at high
altitudes.
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 fireplace.
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 certified
kit is used.
. For propane/LP fireplace, do not place propane/LP
supply tank(s) inside any structure. Locate propane/LP
supply tank(s) outdoors. To prevent performance prob-
lems, 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.
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74D3001
4
DVBL7 Series Gas Fireplace
1. Do not use this fireplace to cook food or burn paper
or other objects.
13. Never place anything on top of fireplace.
14. Do not use any solid fuels (wood, coal, paper, card-
board, etc.) in this fireplace. 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 flow 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 floor-
ing, 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 fireplace if any part has been exposed to
or has been under water. Immediately call a qualified
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 fireplace 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
fireplace.
1. Do not operate the fireplace 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
.
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 gas fireplace to give off some
odor the first time it is burned. This is due to the
manufacturing process.
It is recommended that you burn your fireplace for at
least ten (10) hours the first 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.
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74D3001 5
DVBL7 Series Gas Fireplace
• This appliance has been certified 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 bedsitting
room installations.
• The appliance must be installed in accordance with local
codes if any. If none exist use the current 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.
FP2073
BLDV controls
Off/Pilot/On Knob
Figure 1 -
DVBL7 Series Fireplace
(Millivolt Control shown)
Hi/Lo Knob
On/Off/RS
Switch
Ignitor
FP073
Input ratings are shown in BTU per hour and are certified
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,
installations must be in accordance with the current
ANSI Z3.1/NFPA 54 and/or local codes having juris-
diction.
In Canada, please consult provincial and/or local authori-
ties having jurisdiction for installations at elevations
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.
Max.Input Min. Input Orifice
Model Fuel BTU/h BTU/h Size
400DVBLNV7 Nat. 6,000 1,000 .5 mm
400DVBLPV7 LP 6,000 1,000 1/16 in.
400DVBLNSC7 Nat. 6,000 19,000 .5 mm
400DVBLPSC7 LP 6,000 1,000 1/16 in.
500DVBLNV7 Nat. 8,000 0,000 #38
500DVBLPV7 LP 7,000 ,000 1.55 mm
500DVBLNSC7 Nat. 8,000 0,000 #38
500DVBLPSC7 LP 7,000 ,000 1.55 mm
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74D3001
6
DVBL7 Series Gas Fireplace
R - Rough Opening Width
Rough
Opening
Height
Rough
Opening
Depth
A
B
C
D
E
FG
H
I
JK
L
M
N
O
V
Q
U
T
P
743000
BLDV 7 dims
O
V
S
1/2” or 5/8”
(13 or 16 mm)
Gas Line
Access
A 34Z\x" (876 mm) 37Z\zn" (941 mm) 41Z\zn" (1043 mm)
B 7Z\nv" (686 mm) 9" (737 mm) 33" (838 mm)
C 37C\v" (959 mm) 40B\," (103 mm) 40B\," (103 mm)
D 7Z\v" (69 mm) 30Z\v" (768 mm) 34Z\v" (870 mm)
E 15>\zn" (395 mm) 17>\zn" (446 mm) 17>\zn" (446 mm)
F B\zn" (567 mm) 5ZC\zn" (656 mm) 5ZC\zn" (656 mm)
G 9ZZ\cx" (745 mm) 31M\," (810 mm) 31M\," (810 mm)
H 30Z\zn" (764 mm) 31ZB\zn" (811 mm) 35ZB\zn" (913 mm)
I 3" (76 mm) 3" (76 mm) 3" (76 mm)
J 1" (5 mm) 1" (5 mm) 1" (5 mm)
K 9>\zn" (43 mm) 11C\," (89 mm) 11C\," (89 mm)
L 15/16" (4 mm) 15/16" (4 mm) 15/16" (4 mm)
M 13B\," (346 mm) 15Z\," (384 mm) 17Z\," (435 mm)
N 7Z\v" (184 mm) 7B\zn" (186 mm) 7B\zn" (186 mm)
O Z\v" (57 mm) >\zn" (65 mm) >\zn" (65 mm)
P 7Z\x" (191 mm) 7C\v" (197 mm) 7C\v" (197 mm)
Q 38M\," (987 mm) 41C\v" (1060 mm) 41C\v" (1060 mm)
R 34M\," (886 mm) 37M\zn" (951 mm) 41M\zn" (1053 mm)
S 15M\," (403 mm) 17Z\zn" (433 mm) 17Z\zn" (433 mm)
T 56B\zn" (1430 mm) 64C\v" (1645 mm) 68C\v" (1746 mm)
U 8XZ\cx" (736 mm) 3C\," (8 mm) 34C\," (873 mm)
V 39ZC\zn" (1011 mm) 45ZC\zn" (1164 mm) 48B\," (135 mm)
Figure 2 -
Fireplace Specifications and
Framing Dimensions
7" Dia.
4" Dia.
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74D3001 7
DVBL7 Series Gas Fireplace
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)
• Rock Wool
• Log Set
• Phillips Screwdriver • Framing Materials
• Hammer • Wall Finishing Materials
• Saw and/or saber saw • Level
• Electric Drill and Bits • Tee Joint
• Pliers • Measuring Tape
• Square • Pipe Wrench
• Caulking Material (Noncombustible)
• Fireplace Surround Material (Noncombustible)
• Piping Complying with Local Codes
• Pipe Sealant Approved for use with Propane/LPG
(Resistant to Sulfur Compounds)
Firebox framing can be built before or after the appliance
is set in place. Construct firebox framing following Figure 2
for your specific installation requirements. Refer to Figure
2 for firebox dimensions. The framing headers may rest
on the top of the firebox 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 firebox may be installed directly on a combustible floor
or raised on a platform of an appropriate height. When
the firebox is installed directly on carpeting, tile, or other
combustible material, other than wood flooring, the firebox
shall be installed on a metal or wood panel extending the
full width and depth of the enclosure.
If you live in a cold climate, seal all cracks around your appliance, and
wherever cold air could enter the room, with noncombustible material.
It is especially important to insulate the outside chase cavity between
the studs and under the floor on which the appliance rests, if the floor
is above ground level.
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74D3001
8
DVBL7 Series Gas Fireplace
Plan for the installation of your appliance. This includes determining where the unit is to
be installed, the vent configuration to be used, framing and finishing 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, including permits
and inspections.
The following factors should be taken into consideration:
• Clearance to side-wall, ceiling, woodwork, and windows. Minimum clearances to com-
bustibles
• This fireplace 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 traffic areas and away from furniture and draperies due
to heat from appliance.
• Never obstruct the front opening of the fireplace.
• Do install in the vicinity where gasoline or other flammable liquids may be stored.
• Vent pipe routing. Refer to Venting section found in this manual for allowable venting
configurations.
• These units can be installed in a bedroom. Refer to National Fuel Gas Code ANSI
Z33.1/NFPA 54 — (current edition), the Uniform Mechanical Code — (current edition),
and Local Building Codes for specific installation requirements.
• These units can be installed in a bathroom.
Y
EAB
C
D
F
YB
X
LU584-1
Locating unit
2/4/99 djt
Figure 3 -
Possible Fireplace Locations
** Island (C) and room divider (D) installation is possible as long
as the horizontal portion of vent system (X) does not exceed
0'.
* When you install your fireplace in (D) room divider or (E)
flat on wall corner positions (Y), a minimum of 4" clearance
must be maintained from perpendicular wall and front of
fireplace.
A Flat on Wall
B Cross Corner
C Island**
D Room Divider*
E Flat on Wall Corner*
F Chase Installation
Y 4" Minimum
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74D3001 9
DVBL7 Series Gas Fireplace
The combustible area above the facing must not protrude more than 3/4" from the
facing. If it does, it is considered a mantel and must meet the mantel requirements listed in
this manual.
Figure 4 -
Clearances From The Mantel, Ceiling, and Side Wall
All mantel shelves, regardless of depth, should be a minimum of 13" from
top opening of fireplace. Mantel shelf shall not exceed 1" maximum depth
at 13" minimum height from opening.
71” Minimum
Ceiling
13” Min.
From Opening
12” Max.
Depth
6”
Min.
FP2333
BLDV mantel clear
FP333
45°
1”
256O”
3”
5”
156O”
6”
356O”
456O”
FP2334a
BLDV side leg clear
Figure 4a -
Mantel Clearances
Side of Fire-
place Opening
Wall
Combustible
Material Area
FP334a
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74D3001
10
DVBL7 Series Gas Fireplace
The fireplace must be secured to the floor and/or to framing studs as shown in Figure 5. Use two
() wood screws or masonry/ concrete screws to secure fireplace to the floor. Use four (4) screws
to attach fireplace to framing. The side nailing flanges are 1/" or 5/8" to accommodate different
wall thickness.
Any remote wiring (i.e. remote control, wall switch, and optional fan) must be done prior to
final finishing to avoid costly reconstruction.
Only noncombustible materials (i.e. brick, tile, slate, steel, or other materials with a UL fire 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 finished
wall and the fireplace surround are sealed, a 300°F minimum sealant material (General Electric
RTV103 or equivalent) must be used.
FP2335
nailing flanges
Figure 5 -
Securing Fireplace to Floor
and Framing Studs
Framing
Nailing Flange
Nailing Flange
Screws
Screw
Screw
Nailing
Flanges
Drywall Support Tabs
(Do not use for
framing or header)
FP335
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74D3001 11
DVBL7 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 fireplace manual and vent
kit instructions.
Only a qualified 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 modification of the venting system.
• Installation of any component part not manufactured
or approved by MHSC.
• Installation other than permitted by these instruc-
tions.
Your fireplace is approved to be vented either through the
side wall, or vertical through the roof.
•
• Flexible UL1777 listed venting may be used in any
venting application where rigid direct vent components
can be used. All restrictions, clearances and allowanc-
es that pertain to the rigid piping apply to the flexible
venting.
Flex kits may not be modified. Flex kits may be added
to the end of a vent run made of rigid vent sections
using pipe manufacturer's approved flex to pipe adapt-
ers. This may occur only if doing so does not violate
any of the venting length, height, routing, horizontal to
vertical ratio requirements or clearance considerations
detailed in this manual.
• Venting terminals 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 in-
clining or declining slope.
• Horizontal venting which incorporates the use of flex
venting shall have an inclining slope from the unit of 1”
(5 mm) per 4” (610 mm).
There must not be any obstruction such as bushes, gar-
den sheds, fences, decks or utility buildings within 4”
(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 termina-
tion 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.
It is imperative the vent termination be located observing
the minimum clearances as shown on following page.
Z\x
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74D3001
1
DVBL7 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 soffit 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 soffit 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 floor:
NOTE: 1. Local codes or regulations may require different
clearances.
. 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. MHSC assumes no responsibility for the improper
performance of the appliance when the venting system
does not meet these requirements.
Figure 6 -
Termination Locations
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74D3001 13
DVBL7 Series Gas Fireplace
FP2336
flex vent top
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
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 specified for vinyl or
non-vinyl siding and soffits. 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.
The venting system must conform to local codes and/or
the current National Fuel Code ANSI Z3.1/NFPA 54.
Only venting components manufactured by MHSC may
be used in Direct Vent systems.
The venting system must be installed in accordance with
the current CSA-B149.1 installation code.
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” (5 mm) onto
the collars of the fireplace and termination. If the termi-
nation has an internal bead, be sure to overlap and se-
cure 1” (5 mm) past the bead.
* 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 proce-
dure must be performed on the vent side.
Apply High Tem-
perature Sealant
Hose Clamp
FP336
Figure 8 -
Apply high temperature
sealant to 4” and 7” pipes
Figure 7 -
Termination Clearances
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74D3001
14
DVBL7 Series Gas Fireplace
When using 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 twist lock pipes together, simply align the beads of the male end with the grooves of the fe-
male end, twisting the pipe until the flange on the female end contacts 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. Figure 9
To make it easier to assembly the joints, we suggest putting a lubricant (Vaseline or similar) on the
male end of the twist lock pipe prior to assembly.
TWL100
Twist Lock Pipe
3/12/99 djt
Male End Female End
Screw Holes
TWL100
Figure 9 -
Twist-lock Pipe Joints
The Vent Graph should be read in conjunction with the
following vent installation instructions to determine the re-
lationship 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 di-
mension on the Sidewall Vent Graph, Figure 10, 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 fire-
place in accordance with same.
If the vertical dimension from the floor of the unit is 11’ (3.4
m) the horizontal run to the face of the outer wall must not
exceed 14’ (4.3 m).
If the vertical dimension from the floor of the unit is 7’ (.1
m), the horizontal run to the face of the outer wall must not
exceed 7’ (.1 m).
Page 18
FP2337
sidewall vent graph
2 4 6 8 10 12 14 16 18 20
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
Figure 10 -
Rear Wall Venting Graph
Horizontal dimension from the finished outside wall
to the center of the pipe on the fireplace
Vertical Dimension From the Floor of Unit to the
Center of the Horizontal Vent Pipe
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74D3001 15
DVBL7 Series Gas Fireplace
until the flue penetrates the outside wall.
Figure 11 -
Combustible
Clearances for Vent
Pipe
12”
1”
1”
3”
FP2338
min. vent clear
A minimum of 3" clearance
to the top is required along
horizontal length until flue
pipe penetrates outside
wall.
A minimum 1" clearance
t o c o m b u s t i b l e s
permitted all around
flue at outside wall
Vertical Rise Required
Before Horizontal Run
FP338
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74D3001
16
DVBL7 Series Gas Fireplace
When vent termination exits through foundations less
than 0” (508 mm) below siding outcrop, the vent pipe
must flush up with the siding.
It is best to locate the fireplace in such a way that mini-
mizes the number of offsets and horizontal vent length.
The horizontal vent run refers to the total length of vent
pipe from the flue collar of the fireplace (or the top of the
Transition Elbow) to the face of the outer wall.
Horizontal plane means no vertical rise exists on this por-
tion of the vent assembly.
• The maximum number of 90° elbows per side wall in-
stallation is three (3). Figure 12
• If the min. 1" rise with a 90° elbow is fitted directly
on top of the first 1" section, the maximum horizontal
vent run before the termination or a vertical rise is 36”
(914 mm). Figure 13
• If a 90° elbow is used in the horizontal vent run (level
height maintained) the horizontal vent length is re-
duced by 36” (914 mm). Figures 13 & 14. This does
not apply if the 90° elbows are used to increase or
redirect a vertical rise. Figure 12
12”
Min.
3 x 90°
Elbows
FP1176
Figure 12 -
Maximum Three
(3) 90° Elbows per
Installation
According to the vent graph (Page 15) the
maximum horizontal vent length in a system with a 7Z\x’
(.3 m) rise is 0’ (6 m) and if a 90° elbow is required in
the horizontal vent it must be reduced to 17’ (5. m).
In Figure 15, dimension A plus B must not be greater than
17’ (5. m)
• The maximum number of 45° elbows permitted per in-
stallation is six (6). These elbows can be installed in
either the vertical or horizontal run.
• 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 15
Example: Elbow 1 = 90°
Elbow = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total angular variation = 70°
Max 20"
Max 20"
36"
(914mm)
Max.
36"
(914mm)
Max.
12”
(305 mm)
Min.
FP1177
Figure 13 -
Maximum Horizontal Run with 12 Minimum Rise
1
2
3
4
1
2
3
4
12”
Min.
1 + + 3 + 4 = 70°
Figure 15 -
Maximum Elbow
Usage
FP1180
7'6"
(2.3m)
AB
A + B = 17' (Max.)
(5.2m)
Figure 14 -
Horizontal Run Reduction
FP1178
90°
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74D3001 17
DVBL7 Series Gas Fireplace
VO584-100
Vent Opening
2/99 djt
9B\,”
(44 mm)
Min.
Fireplace Hearth Framing Detail
7Z\x”
(190 mm)
Fireplace Hearth
FP93
Figure 16 -
Locate vent opening on wall.
9B\,”
(44 mm) Min.
Locate vent opening on the wall. It may be necessary to
first position the fireplace and measure to obtain hole lo-
cation. Depending on whether the wall is combustible or
noncombustible, cut opening to size. Figure 16 (For com-
bustible walls first frame in opening.)
When using flex vent, the opening will have to be
measured according to the 1/” (13 mm) rise in 1” (305
mm) vent run.
Cut a 9B\,”H x 9B\,”W (44 x 44 mm)
hole through the exterior wall and frame as shown. Figure
16
Hole opening must be 7Z\x” (191
mm) in diameter.
Secure firestop to the inside frame, center in the 9B\," x
9B\," vent opening.
Place fireplace into position. Measure the vertical height
(X) required from the base of the flue collars to the center
of the wall opening. Figure 17
XX
Figure 17 -
Vertical Height
Requirement
FP1181
Using appropriate length of pipe section(s) attach to fire-
place with three (3) screws. Follow with the installation of
the inner and outer elbow, again secure joints with three
(3) sheet metal screws.
Measure the horizontal length requirement including a ”
(51 mm) overlap, i.e. from the elbow to the outside wall
face plus ” (51 mm) (or the distance required if installing
a second 90° elbow). Figure 18
X
X
Figure 18 -
Horizontal Length
Requirement
FP118
Use appropriate length of pipe sections - telescopic or
fixed - and install. The sections which go through the wall
are packaged with the starter kit, and can be cut to suit if
necessary.
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74D3001
18
DVBL7 Series Gas Fireplace
Guide the vent terminations 4” and 7” collard into their
respective vent pipes. Double check that the vent pipes
overlap the collars by ” (51 mm). Secure the termina-
tion to the wall with screws provided and caulk around
the wall plate to weatherproof. As an alternative to screw-
ing the termination directly to the wall, you may also use
expanding plugs or an approved exterior construction ad-
hesive. You may also attach the termination with screws
through the inner body into the 4” vent pipe, however for
this method, you must extend the 4” pipe approximately
6” (15 mm) beyond the outer face of the wall.
The 40” (1016 mm) flex vent is used for 90° bend
after a straight vertical section (1" min.) then out the
back wall.
Follow Steps 1 - 3 on Page 17.
Install the four (4) spacer springs on the 4” flex vent pipe.
When installing the spacer springs around the 4” pipe,
stretch the spring to approximately 15” (381 mm), wrap
the spring around the pipe and interlock the ends of the
spacer spring approximately ” (51 mm). Measure 18C\v”
(476 mm) from the end of the pipe. Place the next spring
5” (17 mm) from the previously installed spring. Place
the next spring 6” (15 mm) from the last spring. Finally
place the last spring 1” (305 mm) from the last spring
installed. Figure 19
Install the 4” (10 mm) flex vent pipe to the appliance col-
lar as described on Page 13. Secure the end with the first
spring 18C\v” (476 mm) from the flex pipe end to the unit.
Slide the 7” (178 mm) flex vent pipe over the 4” flex vent
pipe and secure the 7” collar as described on Page 13.
Bend the flex pipe horizontal so the bottom of the horizon-
tal pipe measure 18Z\x” (470 mm) from the top of the unit
immediately after the 90° formation. Figure 20. Be sure to
follow the 1/” (13 mm) rise in a 1” (305 mm) horizontal
run rule.
Install the 4” flex then 7” flex to the termination.
12"
(305 mm)
6"
(152 mm)
5"
(127 mm)
186M"
(476 mm)
FP1474
spacer springs
4/04 djt
4" Flex
Vent Pipe
Spacer
Spring
FP1474
Figure 19 -
Install Spacer Springs
1856O"
(470 mm)
FP1475
flex 90 bend
4/04 djt
Figure 20 -
Bend Flex Vent at
90° so Horizontal
Portion is 18Z\x" (470
mm) Off Top of Unit
FP1475
When it is not possible to meet the required vent terminal
clearances of 1” (305 mm) above grade level, a snor-
kel kit is recommended. 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” (610 mm) vertical
rise is necessary. The maximum horizontal run with the
4” vertical pipe is 36” (914 mm). This measurement is
taken from the collar of the fireplace (or transition elbow)
to the face of the exterior wall. See the Sidewall Venting
Graph for extended horizontal run if the vertical exceeds
4” (610 mm).
1. Establish vent hole through the wall. Page 17, Figure
16
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74D3001 19
DVBL7 Series Gas Fireplace
. Remove soil to a depth of approximately 16” (406 mm)
below base of snorkel. Install drain pipe. Install window
well (not supplied). Refill hole with 1” (305 mm) of
coarse gravel leaving a clearance of approximately 4”
(10 mm) below snorkel. Figure 21
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 4” and 7” 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” (10 mm) clear
ance
below snorkel. Figure 21
BG402a
Top Vent
Below grade installation
1/26/00 djt
Firestop
7” Pipe
7TDVSNORK
(Snorkel)
4” (10 mm)
Clearance
Min.
Window
Well
Gravel
Drain
BG40a Figure 21 -
Below Grade Installation
*A minimum of 4” (610 mm) verti-
cal pipe must be installed when
using the 7TDVSNORK Kit.
4” (610 mm)
Minimum*
Screws
Foundation Wall
If the foundation is re-
cessed, use recess
brackets (not supplied)
for securing lower por-
tion of the snorkel. Fas-
ten brackets to wall
first, then secure
to snorkel with
self drilling #8 x
1/ sheet metal
screws. It will be
necessary to ex-
tend vent pipes
out as far as the
protruding wall
face. Figure 22
his gas fireplace has been approved for:
• Vertical installations up to 40’ (1 m) in height. Up to
a 10’ (3 m) horizontal vent run can be installed within
the vent system using a maximum of two 90° elbows.
Figure 23
• Up to two 45° elbows may be used within the horizontal
run. For each 45° elbow used on the horizontal plane,
the maximum horizontal length must be reduced by
18” (450 mm).
Maximum horizontal length:
No elbows = 10’ (3 m)
1 x 45° elbow = 8.5’ (.6 m)
x 45° elbows = 7’ (.1 m)
• A minimum of an 8’ (.5 m) vertical rise is required.
• Two sets of 45° elbow offsets may be used within the
vertical sections. From 0 to a maximum of 8’ (.5 m) of
vent pipe can be used between elbows. Figure 23
• 7DVCS supports offsets. Figure 27. This application
will require that you first determine the roof pitch and
use the appropriate starter kit. (Refer to Venting Com-
ponents List)
• The maximum angular variation allowed in the system
is 70°. Figure 24
• For the minimum height of the vent above the highest
point of penetration through the roof refer to Page 1,
Figure 28.
Max. Height 40’ (12 m)
Min. Height 8’ (2 mm)
Max. 10’ (3 m)
12” (305 mm)
Min.
Support Straps
Every 3' (914 mm)
FP1183
Figure 23 -
Support Straps for Horizontal Runs
BG401
Snorkel
2/10/99 djt
Snorkel
Wall
Screws
Foundation
Recess
Watertight
Seal Around
PIpe
Sheet Metal
Screws
BG401
Figure 22 -
Snorkel Installation,
Recessed Foundation
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74D3001
0
DVBL7 Series Gas Fireplace
1
2
3
4
1
2
3
4
12” Min.
Figure 24 -
Maximum Elbow
Usage
FP1179
For all top vent vertical through-the-roof installa-
tions, install the supplied cross-bar flue restrictor onto the
top edge of the firebox flue adapter. Figure 25
1. Locate your fireplace.
. Plumb to center of the
(4”) flue collar from ceiling
above and mark position.
3.
Cut opening equal to 9C\v” x
9C\v” (48 x 48 mm).
4. Proceed to plumb for addi-
tional openings through the
roof. In all cases, the
opening must provide
a
minimum of 1 inch
clearance to the vent
pipe, i.e., the hole must
be at least 9C\v” x 9C\v” (48 x 48 mm).
5. Place fireplace into position.
6. Place firestop(s) or Attic Insulation Shield into position
and secure. Figure 26
7. Install roof support (Figure 27) and roof flashing mak-
ing sure upper flange is below the shingles. Figure 29
8. Install appropriate pipe sections until the venting is
above the flashing. Figure 29
9. Install storm collar and seal around the pipe.
10. Add additional vent lengths for proper height. Figure
28
11. Apply high temperature sealant to 4” and 7” collars of
vertical vent termination and install.
FP2304
CDV7 top restrictor
3/09
Figure 25 -
Vertical Through-the-Roof
Restrictor (Part #69D3006)
FP304
FP1029
attic insulation shield
firestop spacers
1/28/00 djt
11”
(79 mm)
Joist
Firestop
Spacer
Nails (4)
FP109
Figure 26 -
Place Firestop Spacer(s) and Secure
If there is a room above ceiling level, fire stop spacer must
be installed on both the bottom ad the top side of the ceil-
ing joists. If an attic is above ceiling level an Attic Insula-
tion Shield must be installed. The enlarged ends of the
vent section always face downward.
FP1184
Typical roof/ceiling
support apps.
FP1184
Figure 27 -
Venting Supports
1 + + 3 + 4 = 70°
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This manual suits for next models
6
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