Vermont Casting DVRSL, DVRS3, DVRSR User Manual

Rear V ented
Direct V ent Models
DVRS3
DVRSL
DVRSR
Installation Instructions & Homeowner's Manual
WARNING! IF THE INFORMATION IN THIS MANUAL IS NOT FOLLOWED EXACTLY, A FIRE OR
EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE,PERSONAL INJURY OR LOSS OF LIFE.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS:
* Do not try to light any appliance. * Do not touch any electric switch * Do not use any phone in your building. * Immediately call your gas supplier from
your neighbours phone. Follow the gas suppliers instructions.
* If you cannot reach your gas supplier call the
fire department.
PLEASE KEEP THIS MANUAL FOR FUTURE REFERENCE
The Vermont Castings
Majestic Products Company
410 Admiral Blvd., Mississauga
Ontario, Canada L5T 2N1
www.majesticproducts.com / www.vermontcastings.com
INSTALLER: DO NOT DISCARD THIS MANUAL - LEAVE FOR HOMEOWNER
- 1 -
FOR YOUR SAFETY
OR USE GASOLINE OR OTHER
FLAMMABLE VAPOURS AND LIQUIDS
IN THE VICINITY OF THIS OR ANY
OTHER APPLIANCE.
* Installation and service must be performed
by a qualified installer, service agency or your gas supplier.
10001293
11/01 Rev. 1
TABLE OF CONTENTS
Please read the Installation & Operating Instructions before using this appliance.
Thank you and congratulations on your purchase of a Majestic fireplace.
IMPORTANT: Read all instructions and warnings carefully before starting installation. Failure to follow these instructions
may result in a possible fire hazard and will void the warranty.
Installation Instructions 3
General Information ...................................................................................................... 3
Important Curing/Burn Information ............................................................................... 3
Locating your Fireplace ................................................................................................ 3
Fireplace Dimensions ................................................................................................... 4
Mantels & Mantel Chart ................................................................................................ 4
Clearance to Combustibles........................................................................................... 5
Framing & Finishing...................................................................................................... 5
Final Finishing............................................................................................................... 5
Hearth ................................................................................................................. 5
Gas Specifications ........................................................................................................ 5
Gas Line Installation ..................................................................................................... 6
Remote Switch Installation ........................................................................................... 6
General Venting Information 7
Termination Clearances................................................................................................ 8
ASSEMBLING VENT PIPES WITH CRIMPED ENDS................................................. 9
Rear Venting Applications ..................................................................................... 9
Rear Wall Installation............................................................................................. 9
Vertical Sidewall Applications .............................................................................. 10
How to Use The Vent Graph................................................................................ 12
Sidwall Venting Graph ......................................................................................... 12
Vertical Sidewall Installation ................................................................................ 12
Below Grade Installations .................................................................................... 14
Vertical Through the Roof Applications ............................................................... 15
Vertical Through the Roof Installations................................................................ 16
DVR Series Crimped End Venting Components ................................................. 17
ASSEMBLING TWIST LOCK VENT PIPES .............................................................. 18
Rear Venting Applications................................................................................... 18
Rear Wall Installation........................................................................................... 19
Vertical Sidewall Applications .............................................................................. 20
How to Use The Vent Graph................................................................................ 21
Sidwall Venting Graph ......................................................................................... 21
Vertical Sidewall Installation ................................................................................ 22
Below Grade Installation...................................................................................... 23
Vertical Through the Roof Applications............................................................... 25
Vertical Through the Roof Installation................................................................. 25
DVR Series Twist Lock Venting Components..................................................... 26
Operating Instructions 27
General Glass Information.......................................................................................... 27
Louvre Removal.......................................................................................................... 27
Side Glass Removal ................................................................................................... 27
Front Glass Removal .................................................................................................. 27
Glass Cleaning ........................................................................................................... 28
Ceramic Refractory Installation................................................................................... 28
Installation of Logs...................................................................................................... 29
Lava Rock ............................................................................................................... 29
Ember Material Placement ......................................................................................... 29
Lighting & Operating Instructions (820 Millivolt Gas Valve)........................................ 30
Trouble Shooting (820 Millivolt Gas Valve)................................................................. 31
Flame Adjustment....................................................................................................... 32
Flame Characteristics ................................................................................................. 32
Inspecting the Venting System ................................................................................... 32
Maintenance ............................................................................................................... 32
Cleaning The Standing Pilot Control System.............................................................. 32
Replacement Parts Pictorial 33
Replacement Parts List............................................................................................... 34
Options 35
Fan Kit - FK24............................................................................................................. 35
Remote Control........................................................................................................... 35
- 2 -
INSTALLATION AND OPERATING
INSTRUCTIONS
This gas appliance should be installed by a qualified installer in accordance with local building codes and with current CAN /CGA­B149 (. 1 or .2) Installation codes for Gas Burning Appliances and Equipment. or for U.S.A Installations follow local codes and/or the current National Fuel Gas Code. ANSI Z223.1.
FOR SAFE INSTALLATION AND OPERATION OF YOUR MAJESTIC DIRECT VENT FIREPLACE PLEASE NOTE THE FOLLOWING:
1 . This fireplace gives off high temperatures and should
be located out of high traffic areas and away from furniture and draperies.
2. Children and adults should be alerted to the hazards of the high surface temperatures of this fireplace and should stay away to avoid burns or ignition of clothing.
IMPORTANT: PLEASE REVIEW THE FOLLOWING CAREFULLY
It is normal for fireplaces fabricated of steel to give off some expansion and/or contraction noises during the start up or cool down cycle. Similar noises are found with your furnace heat exchanger or car engine.
It is not unusual for your give off some odour the first time it is burned. This is due to the curing of the paint and any undetected oil from the manufacturing process.
Majestic
gas fireplace to
Please ensure that your room is well ventilated - open all windows.
3. CAUTION: Due to high glass surface temperature children should be carefully supervised when they are in same room as your fireplace.
4. Under no circumstances should this fireplace be modi­fied. Parts having to be removed for servicing should be replaced prior to operating this fireplace again.
5. Installation and any repairs to this fireplace should be carried out by a qualified service person. A profes­sional service person should be contacted to inspect this fireplace annually. Make it a practice to have all
of your gas fireplaces checked annually. More frequent cleaning may be required due to excess lint and dust from carpeting, bedding material, etc.
6. Control compartments, burners and air passages in this fireplace should be kept clean and free of dust and lint. Make sure that the gas valve and pilot light are turned off before you attempt to clean this fireplace.
7. The venting system (chimney) of this fireplace should be checked at least once a year and if needed your venting system should be cleaned.
8. Keep the area around your fireplace clear of combusti­ble materials, gasoline and other flammable vapour and liquids. This fireplace should not be used as a drying rack for clothing, nor should Christmas stock­ings or decorations be hung in the area of it.
9. Under no circumstances should any solid fuels (wood, coal, paper or cardboard etc.) be used in this fireplace.
10.The flow of combustion and ventilation air must not be obstructed in any way.
11.Whether the fireplace is installed directly on carpeting, vinyl tile or any combustible material other than wood, this fireplace must be installed on a metal or wood panel extending the full width and depth of the fireplace.
12.This fireplace requires adequate ventilation and combustion air to operate properly.
LOCATING YOUR
INSTA-FLAME
It is recommended that you burn your fireplace for a least six (6) hours the first time you use it. If optional fan kit has been installed, place fan in the "OFF" position during this time.
LOCATING YOUR
MAJESTIC
Majestic
GAS FIREPLACE
GAS FIREPLACE
A) Wall Installation B) Island Installation (through the wall or vertical)
Note (Fig. 1):
** Island (B) installation is possible as long as the horizontal portion of the vent system (X) does not exceed 20 feet (6100mm). See details in Venting Section.
The minimum clearance between all glass sides and any parallel walls is 3 feet (914mm). A minimum clearance of 3" (76mm) must be maintained from any wall adjacent to one of the glass sides (Fig. 1).
Fig. 1
- 3 -
FIREPLACE DIMENSIONS
P
A 38 B 34 C 34
1/2"
1/4"
3/4"
978mm 870mm
882mm D 21" 533mm E 33" 838mm F 17
1/4"
438mm
DVRS3
O
Q
A
C
E
D
B
F
M
N
C
A
G 22" 559mm H 24
1/2"
622mm I 29" 737mm J2
1/2"
63mm K 4" 102mm L3
1/4"
83mm
DVRSR DVRSL
O
D
B
F
G
B
J
L
O
BD
F
G
I
H
K
M3
3/4"
95mm
N 2" 50mm
FRAMING & FINISHING
O 22" 559mm P 38 Q 34
3/4"
1/2"
984mm 876mm
MANTELS
Depending on the width of the mantel it may be installed higher or lower from the top of the louvre opening. See drawing and chart below for proper installation height of your combustible mantel piece. Non-combustible mantels may be installed at any height above the appliance opening.
When using paint or lacquer to finish the mantel, such paint or lacquer must be heat resistant to prevent discolouration.
MANTEL CHART
Ref. Mantel Width Ref. Height from Top Louvre
V 10" (254 mm) A 12" (305 mm)
W 8" (203 mm) B 10" (254 mm)
X 6" (152 mm) C 8" (203 mm) Y 4" (101 mm) D 6" (152 mm) Z 2" ( 51 mm) E 4" (101 mm)
Fig. 2
- 4 -
CLEARANCE TO COMBUSTIBLES
GAS INLET & MANIFOLD PRESSURES
Input Minimum Input Maximum Manifold Pressure
NATURAL
LP (Propane)
11" wc 13" wc 10" wc
4.5" wc 7" wc
3.5" wc
FINAL FINISHING
Rear ........ 0 mm/0 inches
Floor........ 0 mm/0 inches
Top.......... 0 mm/0 inches
Front & Side Glass 36" (914mm) to parallel wall Side Glass to adjacent wall 3" (76mm)
FRAMING AND FINISHING
1. Choose fireplace location.
2. Place fireplace into position and secure to floor with 1-1/2" screws, or nails. The holes to secure the fireplace to the floor are located just behind the access door grill on the left and right hand side of the fireplace.
3. Frame in fireplace with a header across the top. It is important to allow for finished face when setting the depth of the frame.
4. Attach fireplace to frame using adjustable frame drywall strips(located behind access door for shipping). Preset depth to suit facing material (adjustable to 1/2" , 5/8" or 3/4" depths). Fig. 3.
5. Screw through slotted holes in drywall strip and then screw into pre-drilled holes on fireplace side. Measure from face of fireplace to face of drywall strip to determine final depth. (Fig. 3 & 4)
Non-combustible materials such as brick and tile can be extended over the outer face of the unit
louvres or glass door)
.
(Do not cover
HEARTH
A hearth is not mandatory but it is recommended for aesthetic purposes. We recommend a non-combustible hearth which does not obstruct louvre opening.
Cold climate installation recommendation: When installing this unit against a non­insulated exterior wall or chase, it is mandatory that the outer walls be insulated to conform to applicable insulation codes.
GAS SPECIFICATIONS
MAX. MIN.
MODEL FUEL GAS CONTROL B.T.U.H B.T.U.H.
DVRS3RN Natural Gas Millivolt Hi/Lo 34,000 23,800 DVRS3RP Propane Gas Millivolt Hi/Lo 34,000 25,500 DVRSL RN Natural Gas Millivolt Hi/Lo 34,000 23,800 DVRSL RP Propane Gas Millivolt Hi/Lo 34,000 25,500 DVRSR RN Natural Gas Millivolt Hi/Lo 34,000 23,800 DVRSR RP Propane Gas Millivolt Hi/Lo 34,000 25,500
INPUT INPUT
ADJUSTABLE DRYWALL STRIP
C A
(NAILING FLANGE)
B
SCREW
POSITION
A B C
1/2" / 13mm 5/8" / 16mm 3/4" / 19mm
ADJUSTABLE DRYWALL STRIP, NAILING FLANGE 1/2", 5/8" AND 3/4" SPACING
DRYWALL
DEPTHS
Fig. 3
Fig. 4
The installation of your Majestic Fireplace must conform with local codes, or in the absence of local codes, with National Fuel Gas Code, ANSI Z223.1 — latest edition, or CAN 1 B1-149.1 and .2 Installation Code. (EXCEPTION: Do not derate this appliance for altitude. Maintain the manifold pressure at 3.5 inches W.C. for Natural Gas and 10 inches W.C. for LP gas.)
DVRS3 / DVRSL / DVRSR
CERTIFIED TO
ANSI Z21.88-1998 / CSA 2.33 - M98
Vented Gas Fireplace Heaters
Do not use this fireplace if any part of it has been under water. Immediately call a qualified service technician to inspect the fireplace and replace any part of the control which has been under water.
- 5 -
This appliance may be installed in an aftermarket permanently located, manufactured (mobile) home, where not prohibited by local codes.
This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible for use with other gases, unless an avail­able certified kit is used.
GAS LINE INSTALLATION
When purging gas line one of the glass sides must be removed.
The gas pipeline can be brought in through the rear right side (see Fireplace Specifications) of the appliance as well as the bottom. Knockouts are provided at convenient locations to allow for the gas pipe installation and testing of any gas connection. It is most convenient to bring the gas line in from the rear right side, as this allows fan installation or removal without disconnecting the gas line.
The gas line connection can be made with properly tinned 3/8" copper tubing, 3/8" rigid pipe or an approved flex connector. Since some municipalities have some additional local codes, it is always best to consult your local authority and the CAN/ CGA-B149 (1. or .2) Installation code or for
U.S.A Installations consult the current
National Fuel Gas Code, ANSI Z223.1
Always check for gas leaks with a mild soap and water solution. Do not use an open flame for leak testing.
REMOTE SWITCH INSTALLATION
1. Thread wire through the electrical knockout located on rear of fireplace. Do not cut wire or insulation on metal edges. Ensure that wire is protected. Run the other end to a conveniently located wall receptacle box.
2. Attach wire to switch and install switch into receptacle box. Attach cover plate to switch.
3. Connect wiring to gas valve. (Fig. 6)
VALVE
TPTH
THERMOPILE
TP
TH
P
I
L
T
O
ON/OFF SWITCH OR
MILLIVOLT THERMOSTAT
ALTERNATE SWITCH LOCATION:
Remote switch can be installed on the front side of the access door. Simply mount the switch to the switch bracket provided. Screw the bracket on either side of the frame, lining up the screws with the pre-punched holes. (Fig. 7)
Fig.6
The gas control is equipped with a captured screw type pressure test point, therefore it is not necessary to provide a 1/8" test point up stream of the control.
1/2" GAS SUPPLY
1/2" X 3/8" REDUCER
Typical gas supply installation
3/8" NIPPLE
3/8" X 3/8" SHUT OFF VALVE
3/8" NIPPLE
3/8" UNION
3/8" NIPPLE
Fig..5
When using copper or flex connector use only approved fittings. When using black iron pipe always provide a union so that gas line can be easily disconnected for burner or fan servicing. See Fig. 5. See gas specification for pressure details and ratings.
The fireplace valve must not be subjected to any test pressures exceeding 1/2 psi. Isolate or disconnect this or any other gas appliance control from the gas line when pressure testing.
Fig. 7
DO NOT WIRE MILLIVOLT REMOTE WALL SWITCH FOR GAS FIREPLACE TO A 120V POWER SUPPLY.
FOR LIGHTING INSTRUCTIONS PLEASE TURN TO PAGE 30.
- 6 -
GENERAL VENTING
Your fireplace is approved to be vented either through the side wall, or vertical through the roof.
- Only Majestic venting components specifically approved and labelled for this fireplace may be used.
- Minimum clearances between vent pipes and combustible materials is one (1") inch (25 mm), except where stated otherwise.
- Venting terminals shall not be recessed into a wall or siding.
- Horizontal venting must be installed on a level plane without an inclining or declining slope.
There must not be any obstruction such as bushes, garden sheds, fences, decks or utility buildings within 24" from the front of the termination hood.
Do not locate termination hood where excessive snow or ice build up may occur. Be sure to check vent termination area after snow falls, and clear to prevent accidental blockage of venting system. When using snow blowers, make sure snow is not directed towards vent termination area.
Location of Vent Termination It is imperative that the vent termination be located observ­ing the minimum clearances as shown on this page.
*Check with local codes or in absence of same with CAN/CGA
B149 (.1 or .2) Installation Codes (1991) for Canada or for U.S.A. Installations follow the current National Fuel Gas Code, ANSI Z223.1.
D
E
V
B
L
TERMINATION CAP AIR SUPPLY INLET GAS METER RESTRICTED AREA
V
C
Fixed
Fixed
Closed
Closed
Openable
F
V
B
V
Openable
B
X
V A
A = clearance above grade, veranda, porch, deck, or
balcony [* 12 inches (305mm) minimum] B = clearance to window or door that may be opened C = clearance to permanently closed window [minimum
12 inches (305mm) recommended to prevent con-
densation on window] D = vertical clearance to ventilated soffit located above
the termina/ within a horizontal distance of 24 inches
(610mm) from the centre-line of the terminal [18
inches (458mm) minimum] E = clearance to unventilated soffit [12 inches (305mm)
minimum F = clearance to outside comer see next page G = clearance to inside comer see next page H = * not to be installed above a meter/regulator assem-
bly within 36 inches (914mm) horizontally from the
centre-line of the regulator
Fixed
Closed
J
H
B
V
B
X
G
G
(TERMINATION PROHIBITED)
N
I
M
N
K
V
I = clearance to service regulator vent outlet [*72 inches
(1828mm) minimum]
J = clearance to non-mechanical air supply inlet to
building or the combustion air inlet to any other fireplace [ *12 inches (305mm) minimum]
K = clearance to a mechanical air supply inlet [* 72 inches
(1828mm) minimum]
L = † clearance above paved side-walk or a paved
driveway located on public property [*84 inches (2133mm) minimum]
M = clearance under veranda, porch, deck [*12 inches
(305mm) minimum ‡]
N = Clearance above a roof shall extend a minimum of
24" (610mm) above the highest point when it passes through the roof surface, and any other obstruciton within a horizontal distance of 18" (450mm).
G
V
G
X
V
A
a vent shall not terminate directly above a side-walk or paved driveway which is located between two single family
dwellings and serves both dwellings * ‡ only permitted if veranda, porch, deck is fully open on a minimum 2 sides beneath the floor * * as specified in CAN/CGA B149 (.1 or .2) Installation Codes (1991) for Canada or for U.S.A. Installations follow the
current National Fuel Gas Code, ANSI Z223.1.
Note: Local codes or regulations may require different clearances.
- 7 -
Termination Clearances
Termination clearances for buildings with combustible and noncombustible exteriors.
Inside Corner
A
V
Balcony ­with no side wall
G = Combustible
24"(610mm)
Non-Combustible
18"(457mm)
A =
Combustible 6"(152mm)
Noncombustible 2"(50mm)
G
V
Outside Corner
B =
Combustible 6"(152mm)
V
Noncombustible 2"(50mm)
B
Balcony ­with perpendicular side wall
H
V
J
Combustible & Non-Combustible
H = 24"(610mm) J = 20"(508mm)
Recessed Location
D
C
C
E
V
C = Maximum depth of 48"
(1219mm) for recessed location.
D = Minimum width for back wall of a recessed location. Combustible 38"(965mm) Noncombustible 24"(610mm)
E = Clearance from corner in recessed location. Combustible 6"(152mm) Noncombustible 2"(50mm)
Fig. 8
- 8 -
GENERAL INFORMATION ON ASSEMBLING
THE VENT PIPES WITH CRIMPED ENDS
Before joining elbows and pipes apply a bead of high temperature sealant to crimped end of 4" and 7" elbow or pipe. (Fig. 9)
Join pipes and secure joints with three (3) sheetmetal screws. (See Fig. 9) Wipe off excess sealant.
BEAD LOCATION
1" FROM CRIMPED END OF PIPE
1''
REAR WALL INSTALLATIONS
STEP 1
Locate vent opening on wall. To locate hole centre consult with appropriate fireplace specifications, page 4. Frame as shown below.
Straight Out Thru the Wall Application
Screw Holes
Fig. 9
*IMPORTANT* Minimum clearance between vent pipes and combustible materials is one (1") inch (25 mm) on
bottom, sides and top.
Only Majestic venting components specifically approved and labelled for this fireplace may be used.
REAR VENTING APPLICATIONS
Note: It is not necessary to seal the vent pipe joints
for any straight out the wall rear vent appli­cations.
Note:
Maximum Vent Length .......................... 20" (508mm)- Fig. 10
Vent Starter Kit Model 7DVRVT must be used in straight out the wall rear vent appli­cations.
REAR OF
UNIT
Vent Opening — Combustible Wall
(240mm)
3/8
"
9-
3/8
"
10­(255mm)
(framing detail)
Vent Opening — Noncombustible Wall
1/2
"
7­(190mm)
Fig. 11
Combustible Walls. Cut a 10-3/8"H x 9-3/8"W (265mm x 240mm) hole through the exterior wall and frame as shown. Fig. 11.
20"
(508mm)
Fig. 10
Minimum clearance between vent pipes and combustible materials is one (1") inch (25 mm) on sides and bottom and two (2") inch (50 mm) on top.
When vent termination exits through foundation less than 20" (508mm) below siding outcrop, the vent pipe must flush up with the siding. A 7DVSS must also be used.
Non-Combustible Walls: Hole opening must be 7.5" (190mm) in diameter. To locate hole centre consult with appropriate fireplace specifications, page 4.
STEP 2
Measure wall thickness and cut adjustable zero clearance sleeve parts to proper length (MAXIMUM 12"/305mm). Adjust sleeve to maximum (10-3/8 x 9-3/8). and attach to firestop with #8 sheet metal screws (supplied). (Fig. 12) Install firestop assembly.
- 9 -
#8 SCREWS(2)
ADJUSTABLE
ZERO CLEARANCE
SLEEVE
Fig. 12
#8 SCREWS(2)
ADJUSTABLE ZERO
CLEARANCE SLEEVE
Maximum Length
12" (294mm)
#8 SCREWS(2)
FIRESTOP
STEP 3
Measure from fireplace collar to face of outside wall (add 2" for vent pipe overlap. Mark pipes and cut to length. It is very important that the two pipes are flush with the outside wall once the fireplace is in its final location. Fig. 13.
STEP 4
Slip 4" and 7" pipes onto respective flue collars. Make sure to fix to the fireplace collar the 4" pipe with three (3) screws before fixing the 7" pipe on the 7" collar. Both pipes must be on a level plane. Fig. 13.
STEP 5
Guide the vent termination 4" collar into the 4" pipe then the 7" collar into the 7" pipe. Do not force the venting into position. If the pipes do not line up with the termination collars, disassemble pipes and reattach to the fireplace collar. (Fig. 13)
STEP 6
Secure fireplace to floor through floor holes and adjustable frame drywall strip (nailing flange) to frame. (See Framing & Finishing Section)
VERTICAL SIDEWALL APPLICATIONS
Vent Starter Kit 7DVSK, plus Transition Elbow 7DVRT90 must be used in Vertical Sidewall installations.
inside the 7" pipe coming off the 7DVRT90 transition elbow.
Since it is very important that the venting system maintain its balance between the combustion air intake and the flue gas exhaust, certain limitations as to vent configurations apply and must be strictly adhered to.
The graph showing the relationship between vertical and horizontal side wall venting will help to determine the various vent lengths allowable. Fig. 19.
Minimum clearance between vent pipes and combustible materials is one (1") inch (25 mm) on top, bottom and sides unless otherwise noted.
When vent termination exits through foundation less than 20" below siding outcrop, the vent pipe must flush up with the siding. A 7DVSS must also be used.
It is always best to locate the fireplace in such a way that minimizes 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 to the face of the outer wall.
Horizontal plane means no vertical rise exists on this portion of the vent assembly.
For some installations, it may be desireable
to have some amount of the horizontal vent
run immediately after the fireplace. A verti­cal rise must be used but can be located anywhere in the vent system, to meet the perimeters identified in the venting graph.
The 4" pipe must be centred
Fig. 13
- 10 -
The maximum horizontal vent run is 20 feet (6100mm) when the vertical vent rise is 7.5 feet (2286mm). Fig. 14
MAXIMUM
20ft.
7.5' 90"
(2286mm)
SIDE VIEW
(6100mm)
15ft.
(4572
mm)
Vertical Dimension 8ft. minimum when
horizontal run is
20 ft.
12"
(305 mm)
7DVT90 ELBOW
48"
(1220mm)
VENT
TERMINATION
Fig. 14
VERTICAL SIDEWALL APPLICATIONS
The maximum number of 90 degree elbows per side wall installation is four (4), (includes 7DVRT90 off back of unit)
The maximum number of 45 degree elbows permitted per side wall installation is two (2). These elbows can be installed in either the vertical or horizontal run.
The maximum number of elbow degrees in a system is 270º. (This does not include transition elbow from rear vent to vertical vent).
Sample: 1 - 90º
2 - 45º 3 - 45º 4 - 90º
When one 90º elbow is installed directly onto another off the back of the fireplace the maximum horizontal vent length is 36" (914mm). Fig. 16.
SIDE VIEW
Fig. 15
Fig. 16
Total - 270º
Fig. 15
For each 45 degree elbow installed in the horizontal run (while maintaining a constant horizontal plane), the length of the horizontal run MUST be reduced by 18" (457mm). This does not apply if the 45 degree elbows are installed on the vertical part of the vent system.
If a 90 degree elbow is used in the horizontal vent run (level height maintained) the maxi­mum horizontal vent length is reduced by 36 inches. Fig. 18. This does not apply if the 90 degree elbows are used to increase or redi­rect a vertical rise.
Example: According to the vent chart the maximum horizontal vent length is 20 ft.when the vertical height is 8 ft. from fireplace base height. If one 90 degree elbow is required in the horizontal vent it must be reduced to 17 ft.
120"
3048mm
90º elbow=3'
84"
2134mm
- 11 -
7'
90"
2286mm
Fig. 17
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