Majestic 300DVBNV7 User manual
547050
DVB7 cover
54D7051 1/10 Rev. 3
DVB7 Series Direct Vent Gas Fireplace
54D7051
High Elevations .....................................................5
Gas Pressures ...................................................... 5
Gas Specifications & Orifices ................................ 5
Before You Start ....................................................5
Fireplace & Framing Dimensions ..........................6
Fireplace Location ................................................. 7
Installation Precautions ....................................... 11
Termination Location ........................................... 1
General Information Assembly Vent Pipes .......... 13
Vent Graph ..........................................................14
Rear Wall Vent Applications & Installation .......... 16
Top Vent Sidewall Applications & Installation ...... 17
Below Grade Installation ..................................... 1
Vertical Through-the-Roof Installation .................
Check Gas Type..................................................4
Installing Gas Piping to Fireplace/Burner System
Location ..............................................................4
Electrical Wiring .................................................. 7
Lighting Pilot for the First Time ...........................9
Lighting Pilot .......................................................30
Lighting Burner .................................................... 31
To Turn Off Gas ...................................................31
Junction Box Wiring ............................................ 33
Command Center Wall Installation ...................... 33
Wall Switch Installation .......................................33
Signature Command Wiring Diagram ................. 34
BLOTSCSignature Command System ............... 35
BLOT Automatic Thermostat Blower ...................36
FK-1 Manual Blower .........................................36
Operating Instructions ......................................... 38
To Turn Off Gas To Appliance ............................. 38
Rockwool Placement ..........................................43
Log Placement ....................................................43
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 ...........................51
Signature Command System .............................. 53
Logs .................................................................... 55
Vertical Venting Components .............................. 56
Horizontal Venting Components .........................57
DVB7 Series Direct Vent Gas Fireplace
54D7051 3
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
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 neigh-
bor’s phone. Follow the gas supplier’s instruc-
tions.
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 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. Carefully supervise young children when they are in
the room with fireplace.
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 clean-
ing 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 quali-
fied service person. If needed, have venting system
cleaned or repaired. Refer to Cleaning and Mainte-
nance, Page 44.
11. Keep the area around your fireplace clear of combus-
tible 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 deco-
rations on or around fireplace.
1. Do not use this fireplace to cook food or burn paper or
other objects.
13. Never place anything on top of fireplace.
DVB7 Series Direct Vent Gas Fireplace
454D7051
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 C.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
flooring, 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.
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 fireplaces 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.
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.
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 Z1.88Bb-008/CSA .33b-008 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
.
WARNING
!
HOT GLASS WILL
CAUSE BURNS.
DO NOT TOUCH GLASS
UNTIL COOLED.
NEVER ALLOW CHILDREN
TO TOUCH GLASS.
DVB7 Series Direct Vent Gas Fireplace
54D7051 5
• This appliance has been certified for use with either
natural or propane gas. Refer to 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 approved.
• The appliance must be properly connected to a venting
system.
• The appliance is not approved for closet or recessed
installations.
FP2087
DVB features
Hi/Lo Knob
Off/Pilot/On Knob
On/Off/RS Switch
Ignitor
Blower Control
Optional Remote
Receiver
FP087
Figure 1 -
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,
installation 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
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.
Max.Input Min. Input Orifice
Model Fuel BTU/h BTU/h Size
300DVBNV7 Nat. 1,000 15,000 #43
300DVBPV7 LP 1,000 15,000 #54
300DVBNSC7 Nat. 1,000 15,000 #43
300DVBNPC7 LP 1,000 15,000 #54
400DVBNV7 Nat. 4,000 17,000 #41
400DVBPV7 LP 4,000 17,000 #53
400DVBNSC7 Nat. 4,000 17,000 #41
400DVBNPC7 LP 4,000 17,000 #53
500DVBNV7 Nat. 6,000 0,000 #40
500DVBPV7 LP 6,000 0,000 1.55 mm
500DVBNSC7 Nat. 6,000 0,000 #40
500DVBPSC7 LP 6,000 0,000 1.55 mm
600DVBNV7 Nat. 6,000 0,000 #40
600DVBPV7 LP 6,000 0,000 1.55 mm
600DVBNSC7 Nat. 6,000 0,000 #40
600DVBPSC7 LP 6,000 0,000 1.55 mm
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)
DVB7 Series Direct Vent Gas Fireplace
654D7051
A 33Z\zn” (840 mm) 37Z\zn” (941 mm) 41Z\zn” (1043 mm) 47Z\zn” (1195 mm)
B 9M\,” (759 mm) 3” (813 mm) 36” (914 mm) 4” (1067 mm)
C 7” (686 mm) 9” (737 mm) 33” (838 mm) 39” (991 mm)
D 16Z\x” (419 mm) 18Z\x” (470 mm) 0Z\x” (51mm) 3Z\x” (597 mm)
E 8” (711 mm) 9” (737 mm) 33” (838 mm) 39” (991 mm)
F 18” (457 mm) 0C\,” (518 mm) 0C\,” (518 mm) 0C\,” (518 mm)
G 33M\,” (860 mm) 37Z\x” (953 mm) 37Z\x” (953 mm) 37Z\x” (953 mm)
H 14” (357 mm) 16” (406 mm) 16” (406 mm) 16” (406 mm)
I 37M\,” (96 mm) 41Z\x” (1054 mm) 41Z\x” (1054 mm) 41Z\x” (1054 mm)
J 9B\,” (753 mm) 33Z\,” (841 mm) 33Z\,” (841 mm) 33Z\,” (841 mm)
K Z\,” (54 mm) 1Z\v” (3 mm) 1Z\v” (3 mm) 1Z\v” (3 mm)
L 1Z\x” (38 mm) Z\x” (64 mm) Z\x” (64 mm) Z\x” (64 mm)
M 15/16” (4 mm) 15/16” (4 mm) 15/16” (4 mm) 15/16” (4 mm)
N 31B\,” (803 mm) 34C\v” (883 mm) 34C\v” (883 mm) 34C\v” (883 mm)
O 33Z\x” (851 mm) 37Z\x” (953 mm) 41Z\x” (1054 mm) 47Z\x” (107 mm)
P 38” (966 mm) 41B\,” (1057 mm) 41B\,” (1057 mm) 41B\,” (1057 mm)
Q 13C\v” (349 mm) 15C\v” (400 mm) 15C\v” (400 mm) 15C\v” (400 mm)
R 55ZZ\zn” (1414 mm) 60M\,” (1546 mm) 64M\,” (1648 mm) 70M\,” (1800 mm)
S 39C\,” (1000 mm) 43Z\zn” (1094 mm) 45M\,” (1165 mm) 50Z\,” (173 mm)
T 7ZC\zn” (706 mm) 30M\zn” (773 mm) 3M\zn” (84 mm) 35M\zn” (900 mm)
5/8” 1/2”
5/8”
1/2”
L
C
A
B
M
356O”
856M”
J
5/8"
1/2”
544050
DVB/BDV7 dims
E
D
H
1/2” or 5/8”
Min. Rough
Opening
Height
F
G
NI
O - Min. Rough Opening Width
Min. Rough
Opening
Depth
P
Q
R
S
S
T
K
Figure 2 -
Fireplace and Framing Dimensions
DVB7 Series Direct Vent Gas Fireplace
54D7051 7
Firebox framing can be built before or after the appliance
is set in place. Refer to Figure 2 for fireplace and framing
dimensions. Construct firebox framing following Figure 2
for your specific installation requirements. The framing
headers may rest on the top of the firebox standoffs. Do
not bring headers below top of standoffs.
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.
Plan for the installation of your appliance. This includes
determining where the unit is to be installed, the vent con-
figuration 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, 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 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 appli-
ance.
• 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. See National
Fuel Gas Code ANSI Z33.1/NFPA 54 — (current
edition), the Uniform Mechanical Code — (current edi-
tion), and Local Building Codes for specific installation
requirements.
Y
EAB
C
D
F
YB
X
LU584-1
Locating unit
2/4/99 djt
A Flat on Wall
B Cross Corner
C Island**
D Room Divider*
E Flat on Wall Corner*
F Chase Installation
Y 4” Minimum
** Island (C) and room divider (D) installation is possible as long
as the horizontal portion of vent system (X) does not exceed
0'. Refer to Termination Location on Pages 12 and 13.
* When you install your fireplace in (D) room divider or (E)
flat on wall corner positions (Y), a minimum of 6" clearance
must be maintained from perpendicular wall and front of
fireplace.
Figure 3 -
Fireplace Locations
DVB7 Series Direct Vent Gas Fireplace
854D7051
71” Minimum
11” Minimum
12”
Max.
Min. 4”
From Either
Side Wall
FP2248
mantel clearances
Figure 4 -
Clearances
Ceiling
Combustible Mantel
5”
7”
11”
3”
12”
8”
6”
2”
FP2204a
mantel clearances
Wall
Stud
Standoff
FP04
Top of Exhaust
Louvers
1"
256O”
3"
4"
156O”
256O”
45°
FP2093A
mantel side clearance
Wall
Combustible
Material Area
Side of Fire-
place Opening
FP093a
Figure 5 -
Mantel Clearances
The combustible area above the facing must
not protrude more than 1/" from the facing. If it does,
it is considered a mantel and must meet the mantel
requirements listed in this manual.
DVB7 Series Direct Vent Gas Fireplace
54D7051 9
The fireplace must be secured to the floor and/or to framing studs as shown in Figure 6. 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.
FP2094a
secure fireplace
Framing
Nailing Flange
Screws
Nailing Flange
Screws
Drywall Support Tabs
(Do not use for framing or
header)
Framing
Nailing Flange
Screws
Nailing Flange
FP094a
Figure 6 -
Secure Fireplace to Floor and Framing Studs
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 surface of the appliance. 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.
DVB7 Series Direct Vent Gas Fireplace
10 54D7051
The appliance is shipped as a rear vent unit. If the instal-
lation layout requires the unit to be a top vent configu-
ration the appliance can be converted by following the
steps below.
When removing and refitting the plates and adapter be
sure the associated gaskets are undamaged and refitted
as required.
1. Remove the eight (8) screws securing the flue pipe
adapter to the fireplace body. Figure 7
. Set the flue pipe adapter aside, complete with the
gasket. Do not damage the gaskets as the adapter
and gasket must be refitted.
3. Remove the eight (8) screws securing the flue pipe
cover to the top of the intake box and remove the cover
and gasket. Figure 7
B\,
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
attach flue pipe
Flue Pipe
Screws
FP1993
Figure 9 -
Attach Flue Pipe to Top Vent Configurations
4. Remove six (6) screws securing the flue pipe to the
back of the intake box and remove the pipe and gasket.
Figure 8
5. Replace flue pipe to top of firebox. Ensure the gasket
is in place and undamaged. Secure with six (6) screws.
Figure 9
6. Place the flue pipe cover and gasket removed in step
3 over the flue opening in back of the intake box.
7. Refit the flue pipe adapter and gasket to the top of
fireplace. Secure the adapter with eight (8) screws
removed in Step 1.
DVB7 Series Direct Vent Gas Fireplace
54D7051 11
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 MHS.
• 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 raito 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
DVB7 Series Direct Vent Gas Fireplace
1 54D7051
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 10 -
Termination Locations
DVB7 Series Direct Vent Gas Fireplace
54D7051 13
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.
FP2290
flex vent
Apply High Temperature
Sealant
Hose Clamp
FP90
Figure 12 -
Apply high temperature sealant to 4” and 7” pipes.
Figure 11 -
Termination Clearances
DVB7 Series Direct Vent Gas Fireplace
14 54D7051
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 13
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 13 -
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 14, 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 8Z\x’ (.6 m).
Page 21
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
FP2291
vent graph
20”
Vertical Dimension from the Floor of Unit to the Center of
the Horizontal Vent Pipe
Horizontal Dimension From the Outside of Termination to
the Back of the Fireplace
Figure 14 -
Side Wall Venting Graph
DVB7 Series Direct Vent Gas Fireplace
54D7051 15
Z\x
FP2095a
vent pipe clearance
*3"
**1"
**1"
*3” **1”
**1”
3356”
(841 mm)***
***296" (753 mm)
for 300 Series
48”
(1219 mm)***
***4456O” (1130 mm)
for 300 Series
* A Minimum 3” Clearance to the Top is
Required Along Horizontal Length until
Flue Pipe Penetrates Outside Wall
** A Minimum 1” Clearance to Combus-
tibles Permitted All Around Flue at Out-
side Wall
FP095a
Figure 15 -
Combustible Clearances for Vent Pipe
DVB7 Series Direct Vent Gas Fireplace
16 54D7051
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 MHSC venting components are approved to be
used in these applications (Refer to ‘Venting Compo-
nents’ listed for different installation requirements).
• The maximum horizontal distance between the rear of
the appliance (or end of the transition elbow in a cor-
ner application) and the outside face of the rear wall is
0” (508 mm). Figure 15
• Only one 45° elbow is allowed in these installations.
• Minimum clearances between vent pipe and combus-
tible materials are as follows:
Top - 3” (76 mm)
- except at outside wall 1" (5 mm)
Sides - 1” (5 mm)
Bottom - 1” (5 mm)
FP2292
rear vent top vu
20”
(508 mm)
Max.
Figure 16 -
Rear Vent Appliaction, No Elbows
FP9
Locate and cut the vent opening in the wall.
For combustible walls first frame in opening. Figure 17
When using flex vent, the opening will have to be
measured according to the 1” (5 mm) rise in 4” (610
mm) vertical run.
Cut a 9B\,”H x 9B\,” W (44 x 44
mm) hole through the exterior wall and frame as shown.
Figure 17
Hole opening should be 7Z\x”
(191 mm) diameter.
Secure firestop to the inside frame, center in the 9B\," x
9B\," vent opening.
VO584-100
Vent Opening
2/99 djt
9B\,”
(44 mm)
Min.
Fireplace Hearth Framing Detail
7Z\x”
(190 mm)
Fireplace Hearth FP93
Figure 17 -
Locate vent opening on wall.
9B\,”
(44 mm) Min.
Measure the horizontal length requirement for the venting
including a ” (51 mm) overlap, i.e. from the elbow to the
outside wall face plus ” (51 mm). Figure 16
Install the 4” (10 mm) vent to the appliance collar and
secure with 3 sheet metal screws. Install the 7” (178 mm)
vent pipe to the appliance collar and secure with 3 sheet
metal screws. It is not necessary to seal this connection.
If a 45° elbow is being used attach the elbow to the appli-
ance in the same manner then attach the venting to the
elbow.
Guide the venting through the vent hole as you place the
appliance in its installed position. Guide the 4” (10 mm)
and 7” (178 mm) collar of the vent termination into the
outer ends of the venting. Do not force the termination. If
the vent pipes do not align with the termination, remove
and realign the venting at the appliance flue collars. Fig-
ure 18. Attach the termination to the wall as outlined in the
instruction sheet supplied with the termination.
DVB7 Series Direct Vent Gas Fireplace
54D7051 17
FP2294
Side View Vent Termination
1/25/00 djt
Finish Wall
Vent
Termination
FP94
Figure 18 -
Side View of Final Unit Location
Follow Steps 1 and on Page 16.
Install the 4” (10 mm) flex vent pipe to the appliance col-
lars described in “General Information Assembling Vent
Pipes”, Page 13. If the installation requires a 45° angle,
grasp the vent pipe close to the appliance collar and bend
to 45°. DO NOT exceed 45°. Figure 19
Install the 7” vent pipe in the same manner as Step .
There must be a 1/” (13 mm) rise in a 1” (305
mm) length of flex vent.
Assemble the flex vent to the collars on the termination as
you did on the appliance.
FP1473
corner flex install
4/04 djt
Termination
Flex Section
Appliance Collars
FP1473
Figure 19 -
Grasp the vent pipe close to the collar and
bend to 45° angle. do not exceed 45°.
FP1472
rise in length
4/04 djt
Rise
FP147
Figure 20 -
There must be a 1/2" rise per foot length
For all top vent installations where a 90° elbow
is the first pipe piece towards a sidewall termination (up
and out), an open-center ringed flue restrictor must be
installed onto the top edge of the firebox flue adapter. To
create this open-center restrictor, twist and break off the
center rib of the supplied flue restrictor. The installed part
should appear similar to that show n in Figure 21.
The Vent Graph,
showing the relationship between vertical and horizontal
side wall venting, will help to determine the various di-
mensions allowable.
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.
FP2303
CDV7 rear restrictor
3/09
Figure 21 -
Top Vent Vertical Sidewall
Restrictor
FP303
DVB7 Series Direct Vent Gas Fireplace
18 54D7051
• The maximum number of 90° elbows per side wall in-
stallation is three (3). Figure 22
• If a 90° elbow is fitted directly on top of the fireplace
flange the maximum horizontal vent run before the ter-
mination or a vertical rise is 36” (914 mm). Figure 23
• 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 23 & 24. This does
not apply if the 90° elbows are used to increase or
redirect a vertical rise. Figure 22
FP1176
max 90 bends
3 x 90°
Elbows
3 x 90°
Elbows
FP1176
Figure 22 -
Maximum three (3) 90° elbows per installation
Max 20"
Max 20"
36"
(914 mm)
Max.
36"
(914 mm)
Max.
FP1177
max horizontal run
FP1177
Figure 23 -
Maximum horizontal run with no rise
According to the vent graph (Page 14) 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 Figures 25 & 26, dimension A plus B must not be great-
er 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 26
Example: Elbow 1 = 90°
Elbow = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total angular variation = 70°
7'6"
(2.3m)
AB
A + B = 17' (Max.)
(5.2m)
FP1177
Figure 24 -
Horizontal Run
Reduction
V584-201
Horizontal Run
2/99 djt
10’
(3 m)
7’
(.1 m)
7’6"
(.3 m)
V584-01
Figure 25 -
Maximum Vent Run with Elbows
1
2
3
4
1
2
3
4
Figure 26 -
Maximum Elbow Usage
FP1180
DVB7 Series Direct Vent Gas Fireplace
54D7051 19
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 27 (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 9%\,”W (44 x 44 mm)
hole through the exterior wall and frame as shown. Figure
27
Hole opening must be 7Z\x” (191
mm) in diameter.
VO584-100
Vent Opening
2/99 djt
9B\,”
(44 mm)
Min.
Fireplace Hearth Framing Detail
7Z\x”
(190 mm)
Fireplace Hearth FP93
Figure 27 -
Locate vent opening on wall.
9B\,”
(44 mm) Min.
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 28
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.
XX
Figure 28 -
Vertical Height Requirements
FP1181
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 29
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.
X
X
Figure 29 -
Horizontal Length Requirements FP118
DVB7 Series Direct Vent Gas Fireplace
0 54D7051
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° off the
top of the unit then out the back wall.
Follow Step 1 and on Page 19.
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 6C\v”
(17 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 30
Install the 4” (10 mm) flex vent pipe to the appliance col-
lar as described on Page 14. Secure the end with the first
spring 6C\v” (17 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 6Z\x” (165 mm) from the top of the unit
immediately after the 90° formation. Figure 31. 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"
(305mm)
6"
(152mm)
5"
(127mm)
66M"
(172mm)
FP1474
spacer springs
4/04 djt
4” Flex Vent Pipe
Spacer Spring
FP1474
Figure 30 -
Install Spacer Springs
656O" (165mm)
FP1475
flex 90 bend
4/04 djt
Figure 31 -
Bend flex vent at 90° so horizontal portion is
6Z\x” (165 mm) off top of unit
FP1475
This manual suits for next models
15
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