MHSC CDVR33N/PV7 User manual
20301835 5/10 Rev. 1
Installation and Operating
Instructions
693011
CDVRT7 cover
CDVSC7 & CDV7 Series Gas Fireplace
220301835
High Elevations ...................................................... 6
Gas Pressures ....................................................... 6
Gas Specifications, Orifice Sizes ........................... 6
Fireplace & Framing Dimensions ........................... 7
Before You Start ..................................................... 9
Fireplace Framing ................................................. 9
Fireplace Location ................................................ 10
Finishing Material ................................................. 12
General Venting
Termination Location ..................................... 13
Termination Clearances ................................. 15
Assembling Vent Pipes .................................. 15
Rear Vent Installation Only ............................ 16
How to Use the Vent Graph ........................... 17
Vent Pipe Clearances .................................... 18
Rear Vent Applications & Installation ................... 19
Top Vent Sidewall Applications & Installation ....... 20
Vertical Sidewall Applications & Installation ......... 22
Below Grade Installation ...................................... 24
Vertical Through-the-Roof
Applications & Installation .............................. 25
Check Gas Type................................................... 27
Gas Pipe Installation ............................................ 28
Remote Wall Mounted Switch .............................. 30
Remote Wall Switch ............................................. 30
Optional DC Remote Systems ............................. 30
Electronic Pilot Ignition Wiring ............................. 31
Optional Fan/Blower Systems .............................. 31
What To Do If You Smell Gas ............................... 32
Lighting Pilot for the First Time ............................ 32
Lighting Pilot ........................................................ 33
Lighting Burner ..................................................... 34
To Turn Off Gas .................................................... 34
What To Do If You Smell Gas ............................... 35
Lighting Electronic Ignition ................................... 35
To Turn Off Gas .................................................... 35
Electrical Wiring ................................................... 36
Junction Box Wiring ............................................. 37
Command Center Wall Installation ....................... 37
Wall Switch Installation ........................................ 37
Signature Command System Wiring Diagram ..... 38
BLOTSC Wiring Diagram ..................................... 39
BLOT Automotic Thermostat Blower .................... 40
FK-12 Manual Blower .......................................... 40
What To Do If You Smell Gas ............................... 41
Operating Instructions .......................................... 42
To Turn Off Gas .................................................... 42
Operation Instructions .......................................... 43
Rockwool Placement ........................................... 46
Log Placement ..................................................... 47
Lava Rock and Ember Placement ....................... 47
Burner, Pilot and Control Compartment ............... 48
Pilot Flame ........................................................... 48
Burner Flame ....................................................... 48
Vent System ......................................................... 49
Glass Door ........................................................... 49
Logs ..................................................................... 49
Rock Wool ........................................................... 49
Firebox Components ............................................ 54
Standing Pilot - Millivolt Control ........................... 56
Electronic Ignition ................................................. 58
Signature Command System ............................... 59
Logs ..................................................................... 61
Venting Components ............................................ 62
CDVSC7 & CDV7 Series Gas Fireplace
20301835 3
4. Never install the fireplace
• in a recreational vehicle
• where curtains, furniture, clothing, or other flam-
mable objects are less than 42" from the front, top,
or sides of the fireplace
• in high traffic areas
• in windy or drafty areas
5. This fireplace reaches high 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 quali-
fied service person. If needed, have venting system
cleaned or repaired. See Cleaning and Maintenance,
Page 48.
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 decora-
tions on or around fireplace.
12. Do not use this fireplace to cook food or burn paper or
other objects.
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.
2. 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 neighbor’s
phone. Follow the gas supplier’s instructions.
Please leave these instructions with the appliance.
Please retain these instructions for future reference
.
CDVSC7 & CDV7 Series Gas Fireplace
420301835
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
flooring, you must set appliance on a metal or wood
panel or hearth pad extending the full width and depth
of the appliance.
18. Combustible flooring material such as carpeting may
be used directly in front of this fireplace. A noncom-
bustible hearth extension is not required. Do not cover
any louvers.
19. Do not use fireplace if any part has been exposed to
or has been under water. Immediately call a quali-
fied service person to arrange for replacement of the
unit.
20. Do not operate fireplace if any log is broken.
21. Do not use a blower insert, heat exchanger insert, or
any other accessory not approved for use with this
fireplace.
22. 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 Z21.88-2009 / CSA 2.33-2009 STAN-
DARDS
A manufactured home (USA only) or mobile home OEM
installation must conform with the
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.
CDVSC7 & CDV7 Series Gas Fireplace
20301835 5
• 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 Z223.1/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 installations.
• This appliance is approved to be vented with Simp-
son-Duravent and MHSC T-Lock Direct Vent Compo-
nents.
FP2284a
CDV7 controls
Off/Pilot/On Knob
Remote Control
Switch Receiver
Figure 1 -
CDV7 Series Fireplace
Hi/Lo Knob
Blower
Control
On/Off/RS
Switch
Ignitor
FP2284
The classification “noncombustible material” includes, but
is not limited to stone, brick and mortar. Noncombustibles
are safe to overlay the black-painted metal face (includ-
ing radiant plates) and do not pose a fire hazard. Do not
allow any noncombustible finish material to extend past or
interfere with fireplace opening.
The classification “combustible material” includes, but is not
limited to plywood, drywall and particle board. Combustible
materials may contact the sides, bottom or back of firebox.
Do not overlay the black painted face with combustible
materials.
CDVSC7 & CDV7 Series Gas Fireplace
620301835
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 Z223.1/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).
Max.Input Min. Input Orifice
Model Fuel BTU/h BTU/h Size
CDVR33NV7 Nat. 18,000 13,000 #45
CDVR33PV7 LP 18,000 13,000 1.28 mm
CDVR33NE7 Nat. 18,000 13,000 #45
CDVR33PE7 LP 18,000 13,000 1.28 mm
CDVR33NSC7 Nat. 18,000 13,000 #45
CDVR33PSC7 LP 17,000 14,000 1.25 mm
CDVR36NV7 Nat. 20,000 15,000 #44
CDVR36PV7 LP 20,000 15,000 1.35 mm
CDVR36NE7 Nat. 20,000 15,000 #44
CDVR36PE7 LP 20,000 15,000 1.35 mm
CDVR36NSC7 Nat. 20,000 15,000 #44
CDVR36PSC7 LP 20,000 15,000 1.35 mm
CDVR42NV7 Nat. 24,000 17,000 2.35 mm
CDVR42PV7 LP 24,000 18,000 1.45 mm
CDVR42NE7 Nat. 24,000 17,000 2.35 mm
CDVR42PE7 LP 24,000 18,000 1.45 mm
CDVR42NSC7 Nat. 24,000 17,000 2.35 mm
CDVR42PSC7 LP 24,000 18,000 1.45 mm
CDVR47NV7 Nat. 24,000 17,000 2.35 mm
CDVR47PV7 LP 24,000 18,000 1.45 mm
CDVR47NE7 Nat. 24,000 17,000 2.35 mm
CDVR47PE7 LP 24,000 18,000 1.45 mm
CDVR47NSC7 Nat. 24,000 17,000 2.35 mm
CDVR47PSC7 LP 24,000 18,000 1.45 mm
Natural Propane (LP)
Inlet Minimum 5.5” w.c. 11.0” w.c.
Inlet Maximum 14.0” w.c. 14.0” w.c.
Manifold Pressure 3.5” w.c. 10.0” w.c.
Max.Input Min. Input Orifice
Model Fuel BTU/h BTU/h Size
CDVT33NV7 Nat. 18,000 13,000 #45
CDVT33PV7 LP 18,000 13,000 1.28 mm
CDVT33NE7 Nat. 18,000 13,000 #45
CDVT33PE7 LP 18,000 13,000 1.28 mm
CDVT33NSC7 Nat. 18,000 13,000 #45
CDVT33PSC7 LP 18,000 13,000 1.28 mm
CDVT36NV7 Nat. 20,000 15,000 #44
CDVT36PV7 LP 20,000 15,000 1.35 mm
CDVT36NE7 Nat. 20,000 15,000 #44
CDVT36PE7 LP 20,000 15,000 1.35 mm
CDVT36NSC7 Nat. 20,000 15,000 #44
CDVT36PSC7 LP 20,000 15,000 1.35 mm
CDVT42NV7 Nat. 24,000 17,000 2.35 mm
CDVT42PV7 LP 24,000 18,000 1.45 mm
CDVT42NE7 Nat. 24,000 17,000 2.35 mm
CDVT42PE7 LP 24,000 18,000 1.45 mm
CDVT42NSC7 Nat. 24,000 17,000 2.35 mm
CDVT42PSC7 LP 24,000 18,000 1.45 mm
CDVT47NV7 Nat. 24,000 17,000 2.35 mm
CDVT47PV7 LP 24,000 18,000 1.45 mm
CDVT47NE7 Nat. 24,000 17,000 2.35 mm
CDVT47PE7 LP 24,000 18,000 1.45 mm
CDVT47NSC7 Nat. 24,000 17,000 2.35 mm
CDVT47PSC7 LP 24,000 18,000 1.45 mm
CDVSC7 & CDV7 Series Gas Fireplace
20301835 7
Figure 2 -
CDVR Series Fireplace Dimensions
G
F
H
A
J
C
Q
D
E
156M”
15/16”
P - Minimum Rough Opening Width
Minimum Rough
Opening
Depth
1/2” 5/8”
5/8”
1/2”
Minimum Rough
Opening
Height
C
L
5/8”
1/2”
5/8”
1/2”
IK
L
M
O
M
N
B
693011
CDVR7 DIMS
A 33C\," (848 mm) 33" (838 mm) 37Z\zn" (941 mm) 41" (1041 mm) 47" (1194 mm)
B n/a 35B\," (905 mm) 38B\," (981 mm) 38B\," (981 mm) 38B\," (981 mm)
C 31M\," (810 mm) 31ZZ\zn" (805 mm) 34>\zn" (878 mm) 34>\zn" (878 mm) 34>\zn" (878 mm)
D 27C\zn" (691 mm) 27C\zn" (691 mm) 29Z\zn" (338 mm) 33Z\zn" (840 mm) 39Z\zn" (992 mm)
E 15C\zn" (386 mm) 15C\zn" (386 mm) 20C\," (518 mm) 20C\," (518 mm) 20C\," (518 mm)
F 11C\," (289 mm) 13ZZ\zn" (347 mm) 15C\v" (400 mm) 15C\v" (400 mm) 15C\v" (400 mm)
G 21Z\x" (546 mm) 21C\," (546 mm) 21M\," (556 mm) 25M\," (657 mm) 31M\," (810 mm)
H 21ZB\zn" (557 mm) 21ZB\zn" (557 mm) 25Z\v" (641 mm) 25Z\v" (641 mm) 25Z\v" (641 mm)
I 29M\," (759 mm) 29M\," (759 mm) 32" (813 mm) 36" (914 mm) 42" (1067 mm)
J 2B\zn" (59 mm) 2B\zn" (59 mm) 2C\," (60 mm) 2C\," (60 mm) 2C\," (60 mm)
K 7C\zn" (183 mm) 7C\zn" (183 mm) 5M\zn" (138 mm) 5M\zn" (138 mm) 5M\zn" (138 mm)
L 51" (1295 mm) 48C\v" (1238 mm) 52M\zn" (1332 mm) 56M\zn" (1434 mm) 62M\zn" (1586 mm)
M 36" (914 mm) 34Z\x" (876 mm) 37Z\zn" (941 mm) 40" (1016 mm) 44Z\," (1121 mm)
N 25Z\x" (648 mm) 24C\," (619 mm) 26Z\v" (667 mm) 28Z\v" (718 mm) 31Z\v" (794 mm)
O 11C\v" (299 mm) 13ZZ\zn" (347 mm) 15Z\v" (387 mm) 15Z\v" (387 mm) 15Z\v" (387 mm)
P 33B\," (854 mm) 33Z\v" (845 mm) 37Z\x" (953 mm) 41Z\v" (1048 mm) 47Z\v" (1200 mm)
Q 32Z\v" (819 mm) 35M\," (911 mm) 39" (991 mm) 39" (991 mm) 39" (991 mm)
Model CDVR33SC7 has no standoffs on
top of unit.
CDVSC7 & CDV7 Series Gas Fireplace
820301835
G
F
H
A
J
C
R
D
E
156M”
15/16”
Q - Minimum Rough Opening Width
P
Minimum Rough
Opening
Depth
1/2” 5/8”
5/8”
1/2”
Minimum Rough
Opening
Height
5/8”
1/2”
5/8”
1/2”
I
K
L
M
O
N
N
B
693011
CDVT7 top dims
Figure 3 -
CDVT Series Fireplace Dimensions
A 33" (38 mm) 37Z\zn" (941 mm) 41" (1041 mm) 47" (1194 mm)
B 35B\," (905 mm) 38B\," (981 mm) 38B\," (981 mm) 38B\," (981 mm)
C 31ZZ\zn" (805 mm) 34>\zn" (878 mm) 34>\zn" (878 mm) 34>\zn" (878 mm)
D 27C\zn" (691 mm) 29Z\zn" (338 mm) 33Z\zn" (840 mm) 39Z\zn" (992 mm)
E 15C\zn" (386 mm) 20C\," (518 mm) 20C\," (518 mm) 20C\," (518 mm)
F 14C\zn" (360 mm) 15C\v" (400 mm) 15C\v" (400 mm) 15C\v" (400 mm)
G 21C\," (546 mm) 21M\," (556 mm) 25M\," (657 mm) 31M\," (810 mm)
H 10ZZ\zn" (272 mm) 10ZB\zn" (278 mm) 12ZB\zn" (329 mm) 15ZB\zn" (405 mm)
I 6Z\x" (165 mm) 6Z\x" (165 mm) 6Z\x" (165 mm) 6Z\x" (165 mm)
J 29M\," (759 mm) 32" (813 mm) 36" (914 mm) 42" (1067 mm)
K 2B\zn" (59 mm) 2C\," (60 mm) 2C\," (60 mm) 2C\," (60 mm)
L 7C\zn" (183 mm) 5M\zn" (138 mm) 5M\zn" (138 mm) 5M\zn" (138 mm)
M 48C\v" (1238 mm) 52M\zn" (1332 mm) 56M\zn" (1434 mm) 62M\zn" (1586 mm)
N 34Z\x" (876 mm) 37Z\zn" (941 mm) 40" (1016 mm) 44Z\," (1121 mm)
O 24C\," (619 mm) 26Z\v" (667 mm) 28Z\v" (718 mm) 31Z\v" (794 mm)
P 13ZZ\zn" (347 mm) 15Z\v" (387 mm) 15Z\v" (387 mm) 15Z\v" (387 mm)
Q 33Z\v" (845 mm) 37Z\x" (953 mm) 41Z\v" (1048 mm) 47Z\v" (1200 mm)
R 35M\," (911 mm) 39" (991 mm) 39" (991 mm) 39" (991 mm)
CDVSC7 & CDV7 Series Gas Fireplace
20301835 9
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
• Volcanic Rock
• Rock Wool
• 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.
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.
Firebox framing can be built before or after the appliance
is set in place. Construct firebox framing following Figure 3
for your specific installation requirements. Refer to Figure
3 for firebox dimensions. The framing headers may rest
on the top of the firebox 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.
CDVSC7 & CDV7 Series Gas Fireplace
10 20301835
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 combustibles
• This fireplace may be installed along a wall, across a corner, or use an exterior chase. Refer to
Figure 4 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. See Venting section found in this manual for allowable venting configura-
tions.
• These units can be installed in a bedroom. See National Fuel Gas Code ANSI Z233.1/NFPA 54
— (current edition), the Uniform Mechanical Code — (current edition), and Local Building Codes
for specific installation requirements.
Figure 4 -
Locating Gas Fireplace
** Island (C) and room divider (D) installation is possible as long
as the horizontal portion of vent system (X) does not exceed
20'.
* 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.
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
CDVSC7 & CDV7 Series Gas Fireplace
20301835 11
72"
Minimum
6”
Minimum
fP2032
wall clearances
Figure 5 -
Ceiling and Side Wall Clearances
FP2032
Ceiling
Side
Wall
FP2285b
mantel clearances
W
X
Y
Z
A
B
C
D
Finish Wall
Header
Stud
Standoff
Top of Heat
Exhaust Vent
FP2285b
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 6 -
Mantel Clearances
6"
5"
3" 45°
1"
256O”
156O”
356O”
456O”
FP2286
Mantel leg clear
Side of Fireplace
Opening
Stud
Wall
FP2286
Combustible
Material Area
CDVR33SC7 has no standoffs.
FP2285 36
mantel clearances
12” (305 mm)
256O”
(64 mm)
13”
(330 mm)
12”
(305 mm)
Finish Wall
Header
Stud
Standoff
Top of Heat
Exhaust Vent
FP2285
A 14" (356 mm) 12" (305 mm) W 12" (305 mm) 12" (305 mm)
B 11" (279 mm) 9Z\x" (241 mm) X 8" (203 mm) 8" (203 mm)
C 10" (254 mm) 8Z\x" (216 mm) Y 6" (152 mm) 6" (152 mm)
D 8" (203 mm) 6" (152 mm) Z 2Z\x" (64 mm) 2Z\x" (64 mm)
CDVSC7 & CDV7 Series Gas Fireplace
12 20301835
The fireplace must be secured to the
floor and/or to framing studs as shown
in Figure 7. Use two (2) 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 1/2" or 5/8" to accom-
modate different wall thickness.
Figure 7 -
Securing Fireplace to Floor and
Framing Studs (CDVT36 shown)
FP2287
secure fireplace
Screw
Framing
Framing
Nailing
Flange
Screws
Screw
Nailing
Flange
Nailing
Flanges
Drywall Support Tabs (Do
Not Use for Framing or
Header)
Screw
Screw
FP2287
Any 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.
CDVSC7 & CDV7 Series Gas Fireplace
20301835 13
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 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 T-lock pipe
must be installed on a level plane without an inclining
or declining slope.
• Horizontal venting which incorporates the use of flex
venting shall have an inclining slope from the unit of 1”
(25 mm) per 24” (610 mm).
There must not be any obstruction such as bushes, gar-
den sheds, fences, decks or utility buildings within 24”
(610 mm) from the front of the termination hood.
Do not locate termination hood where excessive snow or
ice build up may occur. Be sure to check vent 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
CDVSC7 & CDV7 Series Gas Fireplace
14 20301835
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, 12” (30 cm) 12” (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), 12” (30 cm) < 10,000 BTU/h (3kW), 9”
for appliances > 10,000 Btuh (3kW) and (23 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), 12” (30 cm) for
appliances > 50,000 BTU/h(15kW)
C = Clearance to permanently closed window 12” (305 mm) recommended to 12” (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 2’ (610mm) from the center
line of the terminal
E = Clearance to unventilated soffit 12” (305 mm) 12” (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), 12” (30 cm) for < 10,000 BTU/h (3kW), 9”
other appliances appliances > 10,000 BTU/h (3kW) and (23 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), 12” (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’ (2.13 m)† 7’ (2.13 m)†
driveway located on public property
M = Clearance under veranda, porch, deck or 12” (30 cm) 12” (30cm)
balcony
1 In accordance with the current CSA-B149 Installation Codes
2 In accordance with the current ANSI Z223.1/NFPA 54 National Fuel
Gas Codes
† A vent shall not terminate directly above a sidewalk or paved
driveway which is located between two single family
dwellings and serves both dwellings
only permitted if veranda, porch, deck or balcony is fully open on a
minimum 2 sides beneath the floor:
NOTE: 1. Local codes or regulations may require different
clearances.
2. The special venting system used on Direct Vent Fireplaces
are certified as part of the appliance, with clearances
tested and approved by the listing agency.
3. MHSC assumes no responsibility for the improper
performance of the appliance when the venting system
does not meet these requirements.
Figure 8 -
Termination Locations
CDVSC7 & CDV7 Series Gas Fireplace
20301835 15
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) 2 x DActual
2 6’ (1.8 m) 1 x DActual
3 9’ (2.7 m) 2/3 x DActual
4 12’ (3.7 m) 1/2 x DActual
DMin. = # of Termination caps x 3
CMax. = (2 / # 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. 2. All mechanical air intakes within 10’ (1 m) of a
termination cap must be a minimum of 3’ (914 mm) below the termination cap. 3. All gravity air intakes within 3’ (914 mm) of a termination cap must
be a minimum of 1’ (305 mm) below the termination cap.
The venting system must conform to local codes and/or
the current National Fuel Code ANSI Z223.1/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” (25 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” (25 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
FP2290
Figure 10 -
Apply high temperature sealant to 4” and 7” pipes.
Figure 9 -
Termination Clearances
CDVSC7 & CDV7 Series Gas Fireplace
16 20301835
When using unitized T-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 sili-
cone sealant are the sliding joints of any telescope vent
sections used in the system.
To join T-Lock pipes together, simply align both inner and
outer pipes with the next section. Align the internal beads
of the female end with the T-channels of the male end.
Figure 11
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 13, locate
the point intersecting with the slanted graph line.
2. From the point of this intersection, draw a vertical line
to the bottom of the graph.
3. Select the indicated dimension, and position the 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’ (2.1
m), the horizontal run to the face of the outer wall must not
exceed 8’ (2.4 m).
Page 24
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
X
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 13 -
Side Wall Venting Graph
X = 22" minimum for 33" Model
X = 25Z\v" minimum for 36", 42" and 47" Models
(Floor to center of horizontal pipe)
Insert male end until beads on the female end contact
bottom of T-channel on male end. Twist pipe until beads
stop at ends of T-channel.
Securing the joints with
sheet metal screws is
not required.
To disassemble T-
Lock pipe, rotate pipe
sections until internal
beads on female end
are centered between
arrow indentations on
male end. Figure 12.
Pipe sections will then
easily separate by pulling straight apart.
FP2741
T-lock undo
Arrow
Indentations
on Male End
Female End
FP2741
Figure 12 -
T-Lock Disassemble
FP2740
T lock channels
Internal Bead T-Channel
Female End Male End
FP2740
Figure 11 -
T-Lock Pipe Joints
Arrow
Indentations
CDVSC7 & CDV7 Series Gas Fireplace
20301835 17
3" 1"
1"
1"
FP2288
TV rear vent
Figure 14 -
Combustible Clearances for Vent Pipe
A Minimum of 3" Clearance
to the Top Is Required
Along Horizontal Length
until Flue Pipe Penetrates
Outside Wall.
A Minimum 1"
Clearance to
Combustibles
Permitted All
Around Flue at
Outside Wall
until
the flue penetrates the outside wall.
until
the flue penetrates the outside wall.
1"
3" 1"
1"
FP2289
RV rear vent
A Minimum of 3" Clearance
to the Top Is Required Along
Horizontal Length until Flue
Pipe Penetrates Outside
Wall.
A Minimum 1" Clearance
to Combustibles Permitted
All Around Flue at Outside
Wall
FP2288
FP2289
CDVSC7 & CDV7 Series Gas Fireplace
18 20301835
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
20” (508 mm). Figure 14
• 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" (25 mm)
Sides - 1” (25 mm)
Bottom - 1” (25 mm)
FP2292
rear vent top vu
20”
(508 mm)
Max.
Figure 15 -
Rear Vent Application, No Elbows
Locate and cut the vent opening in the wall.
For combustible walls first frame in opening. Figure 16
When using flex vent, the opening will have to be
measured according to the 1” (25 mm) rise in 24” (610
mm) vertical run.
Cut a 9B\,”H x 9B\,” W (244 x 244
mm) hole through the exterior wall and frame as shown.
Figure 16
Hole opening should be 7Z\x”
(191 mm) diameter.
Secure firestop to the inside frame, center in the 9B\," x
9B\," vent opening.
Measure the horizontal length requirement for the venting
including a 2” (51 mm) overlap, i.e. from the elbow to the
outside wall face plus 2” (51 mm). Figure 15
Install the unitized T-lock vent pipe to the appliance collar,
following T-lock directions on Page 16. It is not necessary
to seal this connection. If a 45° elbow is being used attach
the elbow to the appliance in the same manner then at-
tach the venting to the elbow.
Securing the joints with sheet metal screws is not re-
quired.
Guide the venting through the vent hole as you place the
appliance in its installed position. Guide the 4” (102 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 17. Attach the termination to the wall as outlined in the
instruction sheet supplied with the termination.
VO584-100
Vent Opening
2/99 djt
9B\,”
(244 mm)
Min.
Fireplace Hearth Framing Detail
7Z\x”
(190 mm)
Fireplace Hearth
FP2293
Figure 16 -
Locate vent opening on wall
9B\,”
(244 mm) Min.
CDVSC7 & CDV7 Series Gas Fireplace
20301835 19
FP2294
Side View Vent Termination
1/25/00 djt
Finish Wall
Vent
Termination
FP2294
Figure 17 -
Side View of Final Unit Location
Follow Steps 1 and 2 on Page 19.
Install the 4” (102 mm) flex vent pipe to the appliance col-
lars described in “General Information Assembling Vent
Pipes”, Page 12. 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 18
Install the 7” vent pipe in the same manner as Step 2.
There must be a 1/2” (13 mm) rise in a 12” (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 18 -
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
FP1472
Figure 19 -
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 re-
strictor, twist and break off
the center rib of the supplied
flue restrictor. The installed
part should appear similar
to that show n in Figure 20.
The Vent Graph, showing the relationship between verti-
cal and horizontal side wall venting, will help to determine
the various dimensions allowable.
When vent termination exits through foundations less
than 20” (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 20 -
Top Vent Vertical Sidewall
Restrictor
FP2303
CDVSC7 & CDV7 Series Gas Fireplace
20 20301835
• The maximum number of 90° elbows per side wall in-
stallation is three (3). Figure 21
• 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 22
• 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 22 & 23. This does
not apply if the 90° elbows are used to increase or
redirect a vertical rise. Figure 21
According to the vent graph (Page 15) the
maximum horizontal vent length in a system with a 7Z\x’
(2.3 m) 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 24 & 25, dimension A plus B must not be great-
er than 17’ (5.2m)
• 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
270°. Figure 25
Example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total angular variation = 270°
3 x 90°
Elbows
3 x 90°
Elbows
FP1176
Figure 21 -
Maximum three (3) 90° elbows per installation
Max 20"
Max 20"
36"
(914mm)
Max.
36"
(914mm)
Max.
FP1177
Figure 22 -
Maximum horizontal run with no rise
7’6"
(2.3m)
AB
A + B = 17’ (Max.)
(5.2m)
FP1178 Figure 23 -
Horizontal Run Reduction
V584-201
Horizontal Run
2/99 djt
10’
(3 m)
7’
(2.1 m)
7’6"
(2.3 m)
V584-201
Figure 24 -
Maximum Vent Run with Elbows
1
2
3
4
1
2
3
4
FP1180
Figure 25 -
Maximum Elbow Usage
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