Desa VM36P, VM42PB, M42P, VM42B, M36P User Manual

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B-VENT DECORATIVE GAS FIREPLACE
OWNER’S OPERATION AND INSTALLATION MANUAL
MODELS M36(B,H), M42(B,H), VM36(B,H) AND VM42(B,H) NATURAL GAS
MODELS M36P(B,H), M42P(B,H), VM36P(B,H) AND VM42P(B,H) PROPANE/LP GAS
WARNING: If the information in these instructions is not followed exactly, a fire or explosion may re
­sult causing property damage, personal injury or death.
FOR YOUR SAFETY
mable vapors or liquids in the vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS :
• 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.
• If you cannot reach your gas supplier, call the fire department.
— Installation and service must be performed by
a qualified installer, service agency or the gas supplier.
SAVE THIS BOOK
This book is valuable. In addition to instructing you on how to install and maintain your appliance, it also contains information that will enable you to obtain replacement parts or optional accessory items when needed. Keep it with your other im­portant papers.
­WARNING: Improper installation, adjust­ment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information consult a quali fied installer, service agency or the gas supplier.
NOT FOR USE WITH SOLID FUEL
CHECK LOCAL CODES PRIOR TO
INSTALLATION
MASSACHUSETTS STATE CODE RE QUIRES THE VENT DAMPER TO BE WELDED OPEN OR REMOVED.
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This appliance may be installed in an aftermarket*, permanently located, manufactured (mobile) home, where not prohibited by state or 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 a certified kit is used.
*Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer.
Save this manual for future reference.
2
TABLE OF CONTENTS
Safety Information ........................................................................2
Unpacking ....................................................................................3
Introduction ................................................................................... 3
Product Specifications ..................................................................
Selecting Location ........................................................................ 5
Pre-Installation Preparation ..........................................................5
Venting Installation .......................................................................
Installation ..................................................................................10
Operating Fireplace ....................................................................16
Inspecting Burners ....................................................................17
Cleaning and Maintenance ......................................................... 18
Wiring Diagram ........................................................................... 18
Service Hints ..............................................................................18
4
Technical Service .......................................................................
Replacement Parts .....................................................................18
Troubleshooting ..........................................................................
8
Illustrated Parts Breakdown and Parts List ................................22
Accessories ................................................................................ 27
Warranty Information ...................................................
18
19
Back Cover

SAFETY INFORMATION

WARNING: This product contains and/or generates chemicals known to the State of California to cause cancer or birth defects or other reproductive harm.
IMPORTANT: Read this owner’s manual carefully and completely before trying to assemble, operate or service this fireplace. Improper use of this fireplace can cause serious injury or death from burns, fire, explosions, electrical shock and carbon monoxide poisoning.
DANGER: Carbon monoxide poisoning may lead to death!
This fireplace is a vented product. This fireplace will not produce any gas leakage into your home if properly installed. This fireplace must be properly installed by a qualified service person. If this unit is not properly installed by a qualified service person, gas leakage can occur.
Carbon Monoxide Poisoning: Early signs of carbon monoxide
poisoning resemble the flu, with headaches, dizziness or nausea. If you have these signs, the fireplace may not have been installed properly. Get fresh air at once! Have fireplace inspected and ser- viced 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.
WARNING: Any change to this fireplace or its con-
trols can be dangerous.
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 pro pane/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 neighborʼs phone.
Follow the gas supplier's instructions
• if you cannot reach you gas supplier, call the fire department.
4. Never install the fireplace
• in a recreational vehicle
• where curtains, furniture, clothing or other flammable
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 igni tion. Fireplace will remain hot for a time after shutdown. Allow surfaces to cool before touching.
6. Carefully supervise young children when they are in the room with fireplace.
7. A hearth extension is not required with this appliance. If one is installed, it is for aesthetic purposes only and does not have to meet the standard requirements.
8. Turn fireplace off and let cool before servicing or repairing. Only a qualified service person should install, service or repair this fireplace. Have fireplace inspected annually by a qualified service person.
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SAFETY INFORMATION
Continued
9. You must keep control compartments, burners and circulating air passages clean. More frequent cleaning may be needed due to excessive lint and dust from carpeting, bedding material, etc. Turn off the gas valve and pilot light before cleaning fireplace.
10. Have venting system inspected annually by a qualified service person. If needed, have venting system cleaned or repaired. See Cleaning and Maintenance, page 18.
11. Keep the area around your fireplace clear of combustible ma­terials, gasoline and other flammable vapor and liquids. Do not run fireplace where these are used or stored. Do not place items such as clothing or decorations on or around fireplace.
12. Do not use this fireplace to cook food or burn paper or other objects.
13. Do not use any solid fuels (wood, coal, paper, cardboard, etc.) in this fireplace. Use only the gas type indicated on fireplace nameplate.
14. 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.
15. 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.
16. Do not install fireplace directly on carpeting, vinyl tile or any combustible material other than wood. The fireplace must set on a metal or wood panel extending the full width and depth of the fireplace.
17. Do not use fireplace if any part has been exposed to or under water. Immediately call a qualified service person to arrange for replacement of the unit.
18. Do not operate fireplace if any log is broken.
19. Do not use a blower insert, heat exchanger insert or other ac­cessory not approved for use with this fireplace.
20. Provide adequate clearances around air openings.

UNPACKING

The following items are packed inside the firebox. Remove before positioning firebox into framing.
• Transition Collar - For vent connection
• Ceramic Log Pack - Shrink-wrapped on cardboard
• Three (3) plastic bags containing lava rock, pan and ember ma-
terials
• Rear Log - Remove the two plastic quick ties from around the
burner and grate
• Grate Stand - Lift off of burner pan
Check all items for any shipping damage. If damaged, promptly inform dealer or distributor where you bought the product.
Safely retain these items for later installation.

INTRODUCTION

Models M36 (P)(B,H), VM36(P)(B,H), M42(P)(B,H) and VM42(P)(B,H) are vented gas fireplaces that use a millivolt gas control valve with a millivolt ignition system. A 6" B-Type venting system and a listed type vent cap are not supplied but are required for proper operation. See venting instructions on pages 9 and 10.
WARNING: This gas appliance must not be con­nected to a chimney flue servicing a solid fuel burning appliance.
Models M36(B,H), VM36(B,H), M42(B,H) and VM42(B,H) are factory equipped for use with natural gas and must be converted when intended for use with propane/LP gas. A respective model PCBM-36 or PCBM-42 conversion kit may be purchased for simple conversion to propane/LP gas. See Accessories, page 27.
BEFORE YOU BEGIN
Before beginning the installation of your appliance, read these instructions through completely.
This DESA appliance and its approved components are safe when installed according to this installation manual and are operated as recommended by DESA. Unless you use DESA approved com­ponents tested for this appliance, YOU MAY CAUSE A FIRE
HAZARD!
The DESA warranty will be voided by and DESA disclaims any responsibility for the following actions :
A) Modification of the appliance or any of the components.
B) Use of any component part not approved by DESA in combina-
tion with this appliance.
C) Installation and/or operation in a manner other than instructed
in this manual.
D) The burning of anything other than the type of gas approved
for use in this gas appliance.
The installation must conform with local codes or, in the absence of local codes, with the current National Fuel Gas Code, ANSI
Z223.1/NFPA 54 or with the current CAN/CGA B149 Installation Codes.
This appliance complies with ANSI Z21.50-2000 and CSA 2.22-2000 as Vented Gas Fireplaces and is listed and tested by the Canadian Standards Association to the above test standards.
WARNING: Installation of this appliance should be done by a qualified service person well trained in the installation of such appliances. You will also need a building permit from your local Building and Safety Com­missioner before installing this appliance; otherwise your insurance co. may not cover this appliance.
NOTICE: This appliance is not intended to be used as a primary source of heat.
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S
T
P
Q
R
X
Outside Air Kit Location (Optional)
K
7"
J
I
M
L
V
13.5"
1.5"
Glass Door (Optional)
W
O
N
Alternate
Gas Supply
Inlet
7"
G
H
F
A
Stand Off
Collar
For Use With
6"Ø Type B-1
Vent Pipe Only
B
E
D
C
DIMENSIONS
HEARTH AREA
7"
INTRODUCTION
Continued
CAUTION: Do not connect appliance before pressure testing gas piping. Damage to gas valve may result and an unsafe condition may be caused.
The appliance and itʼs individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psig (3.5 kPa).
The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).
For the purpose of input adjustment two pressure taps (for IN and OUT pressures) are provided on the gas control valve for test gauge connections to the appliance.

PRODUCT SPECIFICATIONS

GAS RATING - NATURAL
M36(B,H), VM36(B,H) M42(B,H), VM42(B,H)
Max. Input Rating: 40,000 Btu/Hr 45,000 Btu/Hr
Manifold Pressure: 3.5 in. WC (.87 kPa) 3.5 in. WC (.87 kPa)
Minimum Supply Pressure: 4.5 in. WC (1.12 kPa) 4.5 in. WC (1.12 kPa)
Maximum Supply Pressure: 10.5 in. WC (2.66 kPa) 10.5 in. WC (2.66 kPa)
Orifice Size: # 30 # 29
GAS RATING - PROPANE/LP
Max. Input Rating: 40,000 Btu/Hr 45,000 Btu/Hr
Manifold Pressure: 10 in. WC (2.49 kPa) 10 in. WC (2.49 kPa)
Minimum Supply Pressure: 11 in. WC (2.74 kPa) 11 in. WC (2.74 kPa)
Maximum Supply Pressure: 13 in. WC (3.23 kPa) 13 in. WC (3.23 kPa)
Orifice Size: # 52 # 50
M36P(B,H), VM36P(B,H)
M42P(B,H), VM42P(B,H)
Model 36 Model 42 Model 36 Model 42 Model 36 Model 42
A 29" 36" I 40 B 5/8" 5/8" J 21" 24" R 10 C 41" 48" K 8" 9" S 2 D 12" 14" L 34 3/4" 42" T 8 1/8" 8 1/8" E 21 F 22 G 32 H 15
1
/4" 23" M 42" 49" U 11" 12 3/4"
1
/4" (24" w/o Brick) 29 1/4" (31" w/o Brick) N 36" 40" V 7" 7"
5
/8" (34" w/o Brick) 39 1/2" (41 1/4" w/o Brick) O 37" 41" W 2 1/4" 2 1/4"
3
/4" (16 3/4" w/o Brick) 17 3/4" (18 3/4" w/o Brick) P 8 5/8" 10 1/2" X 5" 4 1/2"
1
/4" 44 1/4" Q 13 7/8" 14"
1
/2" 12 1/2"
1
/2" 2 1/2"
Figure 1 - Appliance Dimensions
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0"
0" Clearance
*
*
**
42" (1067mm) Min. Clearance from Opening to Ceiling
0" Clearance
Ceiling
1" (25mm) Min. Clearance to "B" Vent's Outer Pipe
Maintain 2" (51mm) Min. Clearance to the Transition Pipe as Measured at the Outer Vent Collar
Required Air Spaces are Indicated with an "
*
". Do Not Pack with Insulation or Any Other Material
DO NOT BLOCK
OR OBSTRUCT
OPENINGS
0" Clearance to Combustible or Noncombustible Flooring
INTERNAL WALL INSTALLATION
CORNER INSTALLATION
FULL PROJECTION INSTALLATION
FLUSH INSTALLATION
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SELECTING LOCATION

To determine the safest and most efficient location for your appli­ance, you must take into consideration the following guidelines:
1. The location must allow for proper clearances (see Clearances, next column).
2. Consider a location where heat output would not be affected by drafts, air conditioning ducts, windows or doors.
3. A location that avoids the cutting of joists or roof rafters will make installation easier. Figure 2 shows a plan view of a few common locations.
Flush installations are recommended where living space is limited or at a premium and since the space required to enclose the appliance would be located beyond an outside wall, this would also reduce the cutting of joists, roof rafters and such. Check local codes for any restrictions.
Projected installations can extend any distance into the room. A projection may be ideal for a new addition on an existing, fin­ished wall.
Corner installations make use of space that may not normally be used and provides a wider and more efficient range for radiant heat transference.
Internal wall installations provide a discreet option for room sepa­ration and can also be ideal as an addition to an existing wall.

PRE-INSTALLATION PREPARATION

CLEARANCES
Minimum clearances to combustibles are:
• Back and Sides of Outer Surround ..................... 0" min.
• Drywall to Sides of Front Face (Nailing Flanges) 0" min.
• “B” Vent Surfaces ..............................................
• Ceiling to Opening ...........................................
• Floor ................................................................... 0" min.
• Perpendicular Wall ........................ See Figure 6, page 7
CAUTION: Do not block required air spaces with insulation or any other material. Do not obstruct ef fective opening of appliance with any type of facing material.
2 x 4 Stud
Nailing Flange
Back
Left Side Surround
1" min.
42" min.
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Figure 2 - Possible Locations for Installing Appliance
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Front Face
Figure 3 - Minimum Clearances (Top View)
Figure 4 - Minimum Clearances (Front View)
Drywall
6
Spacer
3" (76mm)
1 1/2"
(38mm) Max.
B
6" (152mm)
A
12"
(229mm)
Combustible Materials
Header
1 1/2" (38 mm) Max.
3" (76 mm) Max.
6" (152 mm) Max.
A
B
Outer Surround
Combustible Material May Be Used
TOP
VIEW
SAFE ZONE
Perpendicular Wall
PRE-INSTALLATION PREPARATION
Continued
MANTEL CLEARANCES AND WALL DETAILS
A combustible mantle shelf maybe installed a maximum 12" (229 mm) from the wall. Figures 5 and 6 show the minimum allowable distances from various combustible mantle compo nents in relation to the fireplace opening.
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M36(B,H), M36P(B,H) M42(B,H), M42P(B,H)
VM36(B,H), VM36P(B,H) VM42(B,H), VM42P(B,H)
A 14" (356 mm) 15" (381 mm)
B 8" (203 mm) 9" (229 mm)
Figure 5 - Mantel Clearances - Side View (Cross Section)
M36(B,H), M36P(B,H) M42(B,H), M42P(B,H)
VM36(B,H), VM36P(B,H) VM42(B,H), VM42P(B,H)
A 9" (229 mm) 6" (152 mm)
B 12" (305 mm) 9" (229 mm)
Figure 6 - Side Clearances - Top View (Cross Section)
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B
C
A
A
B
C
D
7
PRE-INSTALLATION PREPARATION
Continued
FRAMING
1. Frame appliance enclosure as illustrated in Figures 7 and 8. Note: If a wall covering is used to line the enclosure, then all
measurements must be from the surface of the covering.
2. Place the appliance into the framing and secure it. Note: If appliance is to be raised above floor level, a platform
must be built to support the appliance.
3. Install the supply line to the appliance using a 1/2" NPT black iron gas line terminating 2 5/16" above the bottom of the ap­pliance. The gas line must be installed through the lower left side access point or alternate access hole in the bottom of the appliance (see Figure 19, page 11).
4. Repack insulation around the gas line to cover any remaining openings in the conduit sleeve. Prepare the incoming gas line with teflon tape or pipe joint compound and hook-up incoming gas line to the flexible gas line.
Note: If 1/2" NPT black iron pipe does not mate with fitting
at the end of flexible gas line, remove fitting and replace with a 37 degree flare 3/4"-12, 1/2" NPT (female) fitting.
WARNING: When finishing appliance, do not overlap
combustible material onto the black front face. Brick, tile or other noncombustible materials may be applied to the face provided that any gap is between the mate­rial used and the face is caulked with a noncombustible caulking.
These Dimensions Allow for a 3/4" Clearance at Sides and Back of Fireplace. However, 0" Clearance is Permitted
3/4" Clearance Not Required at Nailing Flanges
M36(B,H), M36P(B,H) M42(B,H), M42P(B,H)
VM36(B,H), VM36P(B,H) VM42(B,H), VM42P(B,H)
A 24
B 73
C 52
D 17
1
/2" (622.3 mm) 27 9/16" (700.1 mm)
7
/8" (1876.4 mm) 83 7/8" (2130.4 mm)
3
/16" (1326 mm) 59 5/16" (1506.6 mm)
1
/4" (438.2 mm) 19 1/2" (495.3 mm)
Figure 8 - Corner Installation Guidelines
INSTALLING TRANSITION PIPE AND STARTER COLLAR
The transition pipe and starter collar shown in Figure 9 are supplied with the fireplace, unattached and ready for installation. Remove the starter collar and set aside. Slide the transition pipe over the vent collar and attach with a minimum of three screws. Replace the starter collar over the transition pipe and attach using four screws located on the leg stands (five used on the model M42). To install B-vent piping, slide the first piece of B-vent over the transition pipe and attach with either a minimum of two screws or other means approved by the vent manufacturer.
M36(B,H), M36P(B,H) M42(B,H), M42P(B,H) VM36(B,H), VM36P(B,H) VM42(B,H), VM42P(B,H)
A 40
B 21
C 41
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/8" (1020 mm) 44 3/8" (1121 mm)
3
/8" (543 mm) 23 1/8" (587 mm)
1
/4" (1048 mm) 48 1/4" (1226 mm)
Figure 7 - Rough Opening for Installing in Wall
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B-Vent Piping
Starter Collar
Transition Pipe
Vent Collar
Figure 9 - Installing Transition Pipe and Starter Collar
8
Maintain Listed Clearance
12' Min.
12' Min.
45
45
6'
8'
12' Min.
60
45
Position Firestop
Position Firestop
Position Firestop
Listed Ve
nt Cap
Listed Vent Cap
Listed Ve
nt Cap
Maintain Listed Clearance
Maintain Listed Clearance
Maintain Listed Clearance
Maintain Listed Clearance
Maintain Listed Clearance
Support Each Lateral At Least Every Six (6) Feet
Maintain Listed Clearance
10'
EXAMPLE 3EXAMPLE 2EXAMPLE 1

VENTING INSTALLATION

A B-type venting system must be connected to the appliance for venting to the outside of the building.
The following section is provided as a guide to a standard B-type vent installation.
Standing codes requirements concerning B-type vent installations may vary within your state, province or local codes jurisdiction. Therefore, it is recommended that you check with your local build­ing codes for specific requirements or in absence of local codes, follow Section 7.0 of the current National Fuel Gas Code ANSI
Z223.1/NFPA 54 and in Canada with CAN/CGA B149 for Category I systems using double wall B-1 vent pipe.
This gas appliance must be vented to the outdoors only and may not be terminated into an attic space or into a chimney flue servicing a solid-fuel burning appliance.
This appliance may be vented through a manufactured chimney system or a masonry chimney using a B-vent adapter or a chimney liner system if all are listed, inspected and approved by local codes and/or building authorities.
The examples shown in Figure 10 are typical of most B-vent instal lations and codes practices.
Example 1: Shows the minimum allowable system height and lateral offset for a 60° degree or greater inclination. Code specifies that offsets at 60° degrees or greater are considered horizontal and must follow the 75% percent rule for lateral to total vertical system height. Codes also allows only one offset in the total system when at 60° degrees or greater. The total vertical height in this example represents the minimum height of 8 feet and therefore the allowable lateral is 6 feet when the 75% percent rule applies. If the lateral length must exceed 75% then the system must be sized in accordance with the Category I venting tables.
Example 2: Shows a multiple offset each at 45° degrees of inclina­tion. Multiple offsets are permitted if they do not exceed 45° degrees of inclination. The total lengths of the two offsets are not required to meet the 75% percent allowable rule.
Example 3: Shows a single offset at 45° degrees of inclination and therefore the lateral length at 10 feet of offset does not have to meet the 75% percent rule.
In each case the offsets must be supported and firestops must be positioned wherever the vent must pass through a sub-floor, ceiling joist or an attic overhang. The vent pipe must terminate vertically into a listed type vent cap and extend a sufficient height through
­an approved roof flashing, roof jack or a roof thimble. At all points
the listed clearances must be maintained.
Figure 10 - Typical B-Vent Configuration
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Lowest Discharge Opening
Listed Vent Cap
8 Ft. Min.
Roof Pitch x/12 Listed Clearance
12
x
Listed Gas Vent
H (Min) Height From Roof
9
VENTING INSTALLATION
Continued
Vent terminations must be located in accordance with height and proximity rules of NFPA No. 54 or CAN/CGA B149. These rules apply to vents at 12 in. diameter or less and require a minimum height in accordance with the roof pitch and a minimum of 8 ft. distance from a vertical wall or obstruction (see Figure 11).
If venting horizontally through a side wall becomes necessary, a listed thimble approved for use with B-type vent must be used. Check with your local codes before venting through a side wall.
Some codes areas allow the use of existing B-type vent systems if the system is at or above the recommended diameter of the flue; in this case 6".
The flue connection must be made using listed B-type connectors and the existing system must be code inspected for damage and proper installation.
It is not recommended that this appliance be common vented with an existing gas burning appliance. However, if it becomes necessary to common vent this appliance, the venting system must be sized and configured in accordance with the common venting guides Appendix G of the current National Fuel Gas Code ANSI Z223.1/NFPA 54 and in Canada with CAN/CGA B149.
Note: Before connecting this appliance to an existing vent system or a common venting system consult with your local architect, planner or building official.
WARNING: This appliance must be properly con­nected to a system and must not be connected to a chimney flue servicing a separate solid fuel burning appliance.
CHECKING FOR PROPER VENTING
After completing and checking the electrical, gas and vent connec­tions, follow the lighting instructions and allow the main burner to run for approximately 5 minutes. Hold a lighted match or cigarette near the top edge of the fireplace opening and play it along the entire length of the opening (see Figure 12). Proper venting should tend to draw the flame or smoke into the appliance. Improper venting or escaping of spillage of burned gas, is indicated when the match flickers or goes out. Smoke from a cigarette will also tend to disperse away from the appliance.
If the appliance is found to be improperly venting, shut it off and notify your installer or a qualified service agency to inspect the venting system.
NOTICE: This appliance is equipped with a vent safety shutoff switch which will shut down the appliance in the case of a venting problem. Do not bypass the vent safety switch. If the appliance should shut down, contact a qualified installer, service agency or your gas supplier to have the vent inspected before operating.
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Check this area along the entire top edge of the fireplace opening. Smoke or flame should be drawn into the appliance opening.
Roof Pitch H (Min.) Ft. m Flat to 6/12 1.0 0.30 6/12 to 7/12 1.25 0.38 Over 7/12 to 8/12 1.5 0.46 Over 8/12 to 9/12 2.0 0.61 Over 9/12 to 10/12 2.5 0.76 Over 10/12 to 11/12 3.25 0.99 Over 11/12 to 12/12 4.0 1.22 Over 12/12 to 14/12 5.0 1.52 Over 14/12 to 16/12 6.0 1.83 Over 16/12 to 18/12 7.0 2.13 Over 18/12 to 20/12 7.5 2.27 Over 20/12 to 21/12 8.0 2.44
Figure 11 - B-Vent Terminations
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Figure 12 - Checking for Spillage
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