Majestic 400BBV Manual

B-Vent Series
Natural Vent Gas Fireplace
Installation & Operating Instructions
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WARNING
IF THE INFORMATION IN THESE INSTRUCTIONS
IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLO-
SION MAY RESULT CAUSING PROPERTY DAM-
AGE, PERSONAL INJURY OR LOSS OF LIFE.
— Do not store or use gasoline or other flam-
mable vapors and 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 suppli-
er’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.
WARNING: Improper installation, adjustment,
alteration, services or maintenance can cause
injury or property damage. Refer to this man-
ual. For assistance or additional information
consult a qualified installer, service agency or
the gas supplier.
DUE TO HIGH TEMPERATURES, THE APPLI-
ANCE SHOULD BE LOCATED OUT OF TRAF-
FIC AND AWAY FROM FURNITURE AND DRAP-
ERIES.
CHILDREN AND ADULTS SHOULD BE ALERT-
ED TO THE HAZARDS OF HIGH SURFACE
TEMPERATURE AND SHOULD STAY AWAY TO
AVOID BURNS OR CLOTHING IGNITION.
YOUNG CHILDREN SHOULD BE SUPERVISED
WHEN THEY ARE IN THE SAME ROOM AS THE
APPLIANCE.
CLOTHING OR OTHER FLAMMABLE MATE-
RIAL SHOULD NOT BE PLACED ON OR NEAR
THE APPLIANCE.
KEEP THE ROOM AREA CLEAR AND FREE
FROM COMBUSTIBLE MATERIALS, GASO-
LINE AND OTHER FLAMMABLE VAPORS AND
LIQUIDS.
READ BEFORE INSTALLING. SAVE THESE INSTRUCTIONS
Models:
400BBV, 400SBV, 500SBV
62D4037 10/08 Rev. 10

62D4037
2
TABLE OF CONTENTS
Thank you and congratulations on your purchase of an MHSC Fireplace
Please read the Installation and Operation Instructions before using the appliance!
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.
Important Safety Information ...........................3
Product Features ...............................................5
Code Approval ...................................................5
Pre-Installation Information
Installing Above 2000 Feet ..............................6
Orifice Sizes, Pressures and BTU’s ................6
Before You Install ............................................6
Fireplace Framing ...........................................7
Fireplace Dimensions .....................................8
Fireplace Location .........................................10
Clearances .......................................................11
Securing Fireplace to Floor or Framing ........12
Installation Information ...................................13
Vent Installation ...............................................14
Installation Precautions .................................14
Installation Planning ......................................14
Outside Combustion Air Precautions and Rec-
ommendations ............................................16
Combustion Air Assembly .............................17
Fireplace Installation .......................................18
Check Gas Type ............................................18
Installing Gas Piping to Fireplace/Burner Sys-
tem Location .................................................18
Checking Gas Pressure ..................................20
Electrical Installation ......................................21
Electrical Wiring ............................................21
Remote Wall Mounted Switch .......................21
Electronic Pilot Ignition Wiring ......................22
Final Installation ..............................................23
Rock Wool Placement ...................................23
Log Placement .............................................23
Lava Rock and Ember Placement ................23
Operating Instructions ....................................24
What To Do If You Smell Gas ........................24
Lighting Pilot for the First Time .....................24
Lighting Pilot .................................................25
Lighting Burner ..............................................26
Lighting Electronic IGN .................................27
To Turn Off Gas .............................................27
Cleaning and Maintenance .............................28
Burner, Pilot and Control Compartment ........28
Pilot Flame ....................................................28
Burner ...........................................................28
Burner Flame ................................................28
Vent System ..................................................29
Logs ..............................................................29
Rock Wool .....................................................29
Replacement Parts ..........................................30
Firebox Components .....................................30
Logs ..............................................................31
Standing Pilot - Millivolt Control ....................32
Electronic Ignition ..........................................33
Troubleshooting ..............................................36
Warranty ...........................................................43

62D4037 3
IMPORTANT SAFETY INFORMATION
INSTALLER
Please leave these instructions with the appliance.
OWNER
Please retain these instructions for future reference.
WARNING
• Read this owner’s manual carefully and completely before trying to assemble,
operate, or service this fireplace.
• Any change to this fireplace or its controls can be dangerous.
• Improper installation or use of this fireplace can cause serious injury or death
from fire, burns, explosions, electrical shock and carbon monoxide poisoning.
This fireplace is a decorative gas appliance. This fire-
place must be properly installed by a qualified service
person.
CARBON MONOXIDE POISONING: Early signs of
carbon monoxide poisoning are similar to the flue with
headaches, dizziness and/or nausea. If you have these
signs, the fireplace 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 dis-
ease 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 certi-
fied 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 neigh-
bor’s phone. Follow the gas supplier’s instruc-
tions.
4. Never install the fireplace:
• in a recreational vehicle
• where curtains, furniture, clothing, or other flam-
mable objects are less than 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 form hot surfaces to avoid
burns or clothing ignition. Fireplace will remain hot
for a time after shutdown. Allow surfaces to cool be-
fore touching.
6. Carefully supervise young children when they are in
the room with fireplace.
7. Do not modify fireplace under any circumstances.
Any parts removed for servicing must be replaced
prior to operating fireplace.
8. Turn fireplace off and allow to cool before servic-
ing, installing or repairing. Only a qualified service
person should install, service or repair the fireplace.
Have burner system inspected annually by a quali-
fied service person.
9. You must keep control compartments, burners and
circulating air passages clean. More frequent clean-
ing may be needed due to excessive lint and dust
form carpeting, bedding material, pet hair, etc. turn
off the gas valve and pilot light before cleaning fire-
place.
10. Have venting system inspected annually by a quali-
fied service person. If needed, have venting system
cleaned or repaired. Refer to Cleaning and Mainte-
nance, Page 32.
11. Keep the area around your fireplace clear of com-
bustible materials, gasoline and other flammable va-
por 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. Never place anything on top of fireplace.
Continued on Page 4

62D4037
4
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 Electri-
cal Code, ANSI/NFPA 70 or the Canadian Electrical
Code, CSA C22.1.
16. Do not obstruct the flow of combustion and venti-
lation air in any way. Provide adequate clearances
around air openings into the combustion chamber
along with adequate accessibility clearance for ser-
vicing 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.
IMPORTANT SAFETY INFORMATION
18. 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.
19. Do not operate fireplace if any log is broken.
20. Do not use a blower fireplace, heat exchanger fire-
place or any other accessory not approved for use
with this fireplace.
21. The fireplace is not intended for use with a thermo-
stat.
22. This appliance must be installed with draft hood in
same atmospheric pressure zone as the combustion
air inlet to the appliance.
23. For Massachusetts Residents Only: This product
must be installed by a licensed plumber or gas fitter
when installed within the Commonwealth of Massa-
chusetts. Flexline installation must not exceed 36”.
Continued on Page 4
IMPORTANT:
PLEASE READ 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.
IMPORTANT:
PLEASE READ THE FOLLOWING CAREFULLY
It is not unusual for gas fireplace to give off some odor
the first time it is burned. This is due to the manufactur-
ing process.
Please ensure that your room is well ventilated
during burn off - open all windows.
It is recommended that you burn your fireplace for at
least en (10) hours the first time you use it.
Never connect unit to private
(non-utility) gas wells. This gas is
commonly known as wellhead gas.
WARNING
WARNING
Proposition 65 Warning: Fuels listed in gas, wood burning or oil fired appliances, and the products
of combustion of such fuels, contain chemicals known to the State of California to cause cancer,
birth defects and other reproductive harm.
California Health and Safety Code Sec. 25249.6

62D4037 5
PRODUCT FEATURES and CODE APPROVAL
PRODUCT SPECIFICATIONS
• 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 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 US and CSA B149 in Canada.
• The appliance must be properly connected to a venting system.
• The appliance is not approved for closet or recessed installations.
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Gas Control
(not shown)
1/2” Nailing Flange
5/8” Nailing Flange
1/2” Nailing Flange
CODE APPROVAL
These appliances have been tested by CSA and found to comply with the established standards for VENTED GAS
FIREPACES in the US and Canada as follows:
LISTED VENTED GAS FIREPLACE
TESTED TO: ANSI Z21.50a-2008 CSA2.22a-2008
Figure 1
BBV/SBV Fireplace

62D4037
6
PRE-INSTALLATION INFORMATION
HIGH ELEVATIONS
Input ratings are shown in BTU per hour and are certified without deration for elevations up to
4,500 feet (1,370 m) above sea level.
For elevations above 4,500 feet (1,370 m) in USA, installation must be in accordance with the cur-
rent ANSI Z223.1/NFPA 54 and/or local codes having jurisdiction.
In Canada, please consult provincial and/or local authorities having jurisdiciton for installation at
elevations above 4,500 feet (1,370 m).
ORIFICE SIZES, PRESSURES AND BTUs
NATURAL GAS PROPANE GAS
Manifold Press: (w.c.) 3.5” Manifold Press: (w.c.) 10”
Maximum Supply Pressure 10.5” Maximum Supply Pressure 13”
Minimum Supply Pressure 4.5” Minimum Supply Pressure 11”
Model Number 400BBV 400SBV 500SBV
Natural Propane Natural Propane Natural Propane
Max. BTU/hr Input 22,000 22,000 29,000 29,000 31,500 31,500
Min. BTU/hr Input 16,000 14,500 16,500 16,300 19,000 20,000
Burner Orifice size (as shipped) #43 #55 #41 #53 #37 #52
BEFORE YOU START
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) • Plastic Bag (1) • Ziplock Bag 2” x 3” x 3”
• White Toggle Switch • Volcanic Rock • Rock Wool
• Log Set • Switch Cover Plate
ITEMS REQUIRED FOR INSTALLATION
Tools: Building Supplies:
• Phillips screwdriver • Framing materials
• Hammer • Wall finishing materials
• Saw and/or saber saw • Caulking material (noncombustible)
• Level • Fireplace surround material (noncombustible)
• Measuring tape • Piping complying with Local Codes
• Electric drill and bits • Tee joint
• Pliers • Pipe sealant approved for use with Propane/LP gas
• Square (resistant to sulfur compounds)
• Pipe Wrench

62D4037 7
FIREPLACE FRAMING
Firebox framing can be built before or after the appliance is set in place. Construct firebox framing fol-
lowing Figure 2 and the chart below for your specific installation requirements. Refer to Page 8, 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.
PRE-INSTALLATION INFORMATION
Do not fill spaces around firebox with
insulation or other materials. This
could cause a fire.
WARNING
B
A
H
G
D
F
E
A
C
1/2" or 5/8"
C
A
G
C
G
A
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Corner Installation
Inside Chase Installation
Stud Location
Recessed Installation
Figure 2 -
Framing Dimensions
400BBV 400SBV 500SBV
A 40¹⁄₂” 40¹⁄₂” 46¹⁄₂”
B 40¹⁄₄” 40¹⁄₄” 40¹⁄₄”
C 31³⁄₈” 24¹³⁄₁₆” 30¹³⁄₁₆”
D 16¹⁄₈” 13¹⁄₂” 16¹⁄₂”
E 61¹⁄₄” 67⁷⁄₈” 73⁷⁄₈”
F 30⁵⁄₈” 34” 37”
G 14¹⁄₂” 21¹⁄₂” 21¹⁄₂”
H 43³⁄₈” 48” 52¹⁄₄”

62D4037
8
PRE-INSTALLATION INFORMATION
FIREPLACE DIMENSIONS
400BBV
31”
14”
Framing
Dimension
14”
1/2” or 5/8”
Drywall Spacers
1/2” or 5/8”
Drywall Spacers
8”
9”
Air Kit
16”
7”
Electrical/Gas
Access
2”
40”
40”
Framing
Dimension
21”
34”
6”
B
C
D
Framing Dimension
624037
400 BBV dims
10/08
4”
B-Vent
Center Line
Top View
Side View
Front View
Figure 3 -
400BBV Dimensions

62D4037 9
PRE-INSTALLATION INFORMATION
FIREPLACE DIMENSIONS
400SBV and 500SBV
For easier installation on SBV400 and
SBV500 units, place gas supply pipe
6” to 8” inside unit. Measure from the
center of the gas knock-out hole lo-
cated at the bottom of the left side.
NOTE
400SBV 500SBV
A 24¹³⁄₁₆” 30¹³⁄₁₆”
B 36” 42”
C 40” 46”
D 40¹⁄₂” 46¹⁄₂”
A
21”
Framing
Dimension
21”
13”
6”
1/2” or 5/8”
Drywall Spacers
1/2” or 5/8”
Drywall
Spacers
9”
Air Kit
16”
14”
Electrical/Gas
Access
2”
34”
6“
B
C
D
Framing Dimension
21”
40”
40”
Framing
Dimension
624037
SBV dims
10/08
6”
B-Vent
Top View
Side View
Front View
Figure 4 -
400SBV and 500SBV Dimensions

62D4037
10
PRE-INSTALLATION INFORMATION
FIREPLACE LOCATION
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 acces-
sories (i.e. 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
must be maintained.
• This fireplace may be installed along a wall, across a corner or use an exterior chase.
• Location should be out of high traffic areas and away form furniture and draperies due to heat
from appliance.
• Never obstruct the front opening of the fireplace.
• Do not install in the vicinity where gasoline or other flammable liquids may be stored.
• Vent pipe routing. Refer to Venting section found in this manual for allowable venting configura-
tions.
• These units can be installed in a bedroom. Refer to the 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.

62D4037 11
CLEARANCES
CLEARANCES TO COMBUSTIBLES
WARNING
Follow these instructions carefully to ensure safe installation. Failure to follow
instructions exactly can create a fire hazard.
The appliance cannot be installed on a carpet, tile or other combustible material
other than wood flooring. If installed on carpet or vinyl flooring, the appliance
shall be installed on a metal, wood or noncombustible material panel extending
full width and depth of the appliance.
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

Combustible Mantel
Side Wall
Ceiling
72” Minimum
8” Minimum
Minimum 3”
From Both Side
Walls to
Opening
12” Maximum
Depth
FP2018
Figure 5 -
Clearances

62D4037
12
SECURING FIREPLACE TO FLOOR OR FRAMING
The fireplace must be secured to the floor and/or to framing studs as shown in Figure 6. 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 brackets are adjustable from 1/2” to 5/8” to accommodate
different thicknesses of material.
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
Framing
1/2” Nail
Flange
Screws
Screws
Screws
Framing
1/2” Nail
Flange
1/2” Nail
Flange
1/2” Nail
Flange
5/8” Nail Flange
5/8” Nail Flange
FP2019
Figure 6 -
Secure Fireplace to Floor and Framing Studs

62D4037 13
INSTALLATION INFORMATION
FINISHING MATERIAL
NOTE: Any remote wiring (i.e. remote control and wall switch) must be done prior to final fin-
ishing to avoid costly reconstruction.
WARNING
Never obstruct or modify
the air inlet. This may create
a fire hazard.
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 sur-
round are sealed, a 300° F minimum sealant material (General Electric RTV 103 or equivalent) must
be used.

62D4037
14
VENT INSTALLATION
INSTALLATION PLANNING
“B” VENT PIPE
See venting installation instructions provided by the B-Vent manufacturer.
NOTE: This APPLIANCE MUST BE INSTALLED using “B” vent type pipe that has been listed
by a nationally recognized testing agency.
Refer to B-Vent Pipe Sizing chart for proper elbow offset runs.
B-Vent Pipe Sizing
400BBV/400BBV 400SBV/400SBV 500SBV/500SBV
4” 6” 6”
Locate chimney center line dimension form a combustible back wall. Page 9, Figures 3 and 4
• Minimum vertical chimney height - 8’
• Minimum height with two (2) 90° elbows - 8’
• Elbow requirements allow a maximum of two (2) 90° elbows or four (4) 45° elbows per
installation.
NOTE: Two (2) 45° elbows = one (1) 90° elbow
• Horizontal run must never exceed 50% of the height of the vent system.
WARNING
Read all instructions completely and thoroughly before attempting installation.
Failure to do so could result in serious injury, property damage or loss of life.
Operation of improperly installed and maintained venting system could result in
serious injury, property damage or loss of life.
NOTICE
Failure to follow these in-
structions will void the war-
ranty.
INSTALLATION PRECAUTIONS
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 venting 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 venting 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 instructions.

62D4037 15
VENT INSTALLATION
FIRESTOP INSTALLATION
To position firestop refer to Figures 9 and 10. Only one (1) firestop required per frame.
NOTE: A firestop is not required at the roof.
NOTICE
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

Nails
Firestop
Spacer
Joist
FP2020
Nails
Firestop
Spacer
Joist
Figure 9 -
Install Firestop in Attic Figure 10 -
Install Firestop in Ceiling
When installing in a chase, you should insulate the chase as you would the out-
side walls of your home. This is especially important in cold climates. Insulation
should be considered a combustible material. Maintain proper clearances to all
combustible materials.
NOTICE
Treatment of firestops and construction of the chase may vary from buiding type
to building type. These instructions are not substitutes for the requirements of
local building codes. You must follow all local building codes.

62D4037
16
OUTSIDE COMBUSTION AIR PRECAUTIONS and RECOMMENDATIONS
NOTE: The use of outside air for combus-
tion is optional unless required by build-
ing codes. It is only necessary to supply
outside combustion air to one side of fire-
place. Use model OAC4 combustion air kit
(refer to Page 17).
1. Avoid extremely long runs and numer-
ous turns in duct leading from fireplace
to combustion air assembly. These condi-
tions increase the resistance to free flow
of air through duct. Figures 11 and 12
2. Locate combustion air assembly at an
exterior location. Make sure the location
cannot be accidentally blocked. Locate
assembly above snow line to prevent
snow from blocking assembly.
3. Never mount combustion air inlet assem-
bly in garage or storage area where com-
bustible fumes (gasoline) might be drawn
into fireplace.
4. Combustion air may be drawn from crawl
space under house when adequate sup-
ply of air is provided by open ventilation.
Figure 11
NOTE: Never take combustion air from at-
tic space or garage space.
NOTE: Install outside combustion air
ONLY ON LEFT-HAND SIDE of fireplace.



Duct Extend-
ed to Miss
Joist
To Outside
Wall
FP2021
Figure 11 -
Install Unit Above Basement or Crawl Space
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

Inlet Grille
in Soffit
(Overhang)
8” Maximum
Figure 12 -
Install Unit on Concrete Slab with Optional Outside Air Runs
FP2022

62D4037 17
COMBUSTION AIR ASSEMBLY
MODEL OAC-4 COMBUSTION AIR ASSEM-
BLY
1. Remove the cover plate from the 4” outlet opening
location on the left outside of the fireplace.
2. Place starting collar (4”) into hole on left side of
fireplace. Fireplace shortest side of air starting collar
through fireplace outer wrap. Fasten starting collar
in place with four (4) sheet metal screws provided.
Figure 13
NOTE: The air starting collar extends through the
fireplace outer wrap. When the air starting collar is
securely attached, it will form a seal against the fire-
place wall.
3. Cut a 6” diameter opening for model OAC-4 in the
outside wall covering where the outside vent is to be
located. Figure 15
4. Select and cut a piece of duct long enough to attach
to the fireplace and stick out at least 3” beyond the
face of the wall to which the OAC-4 inlet air vent will
be attached. Cut duct with a standard pocket knife.
Figure 14
WARNING
DO NOT remove the cover
if the outside air will not be
connected.
WARNING
Do not use a combustible duct. Always
use UL Listed Class 0 or 1 duct material.
If necessary to splice duct, use Model
403 duct connector to splice duct sec-
tions.



Left Side of
Fireplace OAC-4
Starting
Collar
Sheet Metal
Screws
Shorter End of Air
Starting Collar
FP2023
Figure 13 -
Attach Outside Air Starting Collar to
Left Side of Fireplace



Air Starting Collar
Screws
Screws
Duct
Left Side of
Fireplace
FP2024
Figure 14 - Attach Outside duct to Starting Collar



6” Diameter
Hole
Duct Ex-
tending 3”
Min.
AK-4 Inlet Air
Vent
Nail
Hole
Screws
FP2025
Figure 15 -
Combustion Air Assembly for Model No. OAC-4
5. If using insulating duct, push the insulation back
from one end of the duct approximately 2”. Figure 15
6. Slip the exposed end of the duct over the starting
collar on the fireplace.
7. Using the sheet metal screws provided, secure the
duct end to the collar attached to the fireplace.
8. Nail or screw the combustion air assembly to the
surface of the wall.

62D4037
18
FIREPLACE INSTALLATION
CHECK GAS TYPE
Use proper gas type for the fireplace you are installing. If you have conflicting gas types, do not
install fireplace. See dealer where you purchased the fireplace for proper fireplace for your gas
type.
INSTALLING GAS PIPING TO FIREPLACE LOCATION
INSTALLATION ITEMS NEEDED
Before installing, make sure you have the items listed below:
• External regulator (supplied by installer) • Tee Joint
• Piping (check local codes) • Pipe wrench
• Sealant (resistant to propane/LP gas)
• Test gauge connection*
• Sediment trap (optional but recommended)
• Approved flexible gas line with gas connector (if allowed by
local codes - not provided)
*A CSA design-certified equipment shutoff valve with 1/8”
NPT tap is an acceptable alternative to test gauge connec-
tion. Purchase the CSA design-certified equipment shutoff
valve from your dealer.
For propane/LP connections only, the installer must supply an external regulator. The external
regulator will reduce incoming gas pressure. You must reduce incoming gas pressure to between
11 and 13 inches of water. If you do not reduce incoming gas pressure, burner system regulator
damage could occur. Install external regulator with the vent pointing down as shown in Figure 16.
Pointing the vent down protects it from freezing rain or sleet.
WARNING
A qualified installer or service person
must connect appliance to gas supply.
Follow all local codes.
CAUTION
For propane/LP units, never connect
fireplace directly to the propane/LP
supply. This burner system requires an
external regulator (not supplied). Install
the external regulator between the burn-
er system and propane/LP supply.
CAUTION
Use only new black iron or steel pipe. In-
ternally tinned copper or copper tubing
can be used per National Fuel Code, sec-
tion 2.6.3, providing gas meets hydrogen
sulfide limits, and where permitted by
local codes. Gas piping system must be
sized to provide minimum inlet pressure
(listed on data plate) at the maximum
flow rate (BTU/hr). Undue pressure loss
will occur if the pipe is too small.
WARNING
External regulators may be necessary
for natural gas. One- or two-pound sys-
tems will damage this appliance and
may cause fire hazard.


External
Regulator
100 gal.
(min) Pro-
pane/LP
Supply
Tank
Vent
Pointing
Down
FP1977
Figure 16 -
External Regulator with Vent Pointing Down
(Propane/LP Only)
When using copper or flex connectors use only fittings approved for gas connections. The
gas control inlet is 3/8” NPT.

62D4037 19
FIREPLACE INSTALLATION
WARNING
Only persons licensed to work with gas
piping may make the necessary gas
connections to this appliance.
CAUTION
A manual shut-off valve must be installed
upstream of the appliance. Union tee and
plugged 1/8” NPT pressure tapping point
should be installed upstream of the ap-
pliance. Figure 17
NOTE: The gas line connection may be made using 1/2” rigid tubing or an approved flex con-
nector. Since some municipalities have additional local codes, it is always best to consult your
local authorities and the current edition of the National Fuel Gas Code ANSI Z223.1/NFPA 54. In
Canada CSA-B149 (1 or 2) Installation Code.
A listed manual shut-off valve must be installed upstream of the appliance. Union tee and plugged 1/8”
NPT pressure tapping point should be installed upstream of the appliance. Figure 17
IMPORTANT: Install main gas valve (equipment shut-off valve) in an accessible locations. The main
gas valve is for turning on or shutting off the gas to the fireplace.
Check your building codes for any special requirements for
locating equipment shut-off valve to fireplaces.
Apply pipe joint sealant lightly to male threads. This will pre-
vent excess sealant form going into pipe. Excess sealant in
pipe could result in clogged burner system valves.
We recommend that you install a sediment trap/drip leg in
supply line as shown in Figure 17. Locate sediment trap/drip
leg where it is within reach for cleaning. Install in piping system between fuel supply and burner system.
Locate sediment trap/drip leg where trapped matter is not likely to freeze. A sediment trap traps mois-
ture and contaminants. This keeps them from going into the burner system gas controls. If sediment
trap/drip leg is not installed or is installed wrong, burner system may not run properly.
CAUTION
Use pipe joint sealant that is resistant to
liquid petroleum (LP) gas.
m
u
m
i
n
i
M
"
3


Approved Flexible
Gas LIne
UL/CSA Design-Certified
Equipment Shut-off Valve
with 1/8” NPT Tap*
Tee Joint
Pipe Nipple
Cap
Natural Gas
From Gas Meter
(5” w.c. to 10.5” w.c. Pressure)
Propane/LP
From External Regulator
(11” w.c. to 13” w.c. Pressure)
Sediment Trap/Drip Leg
Figure 17 -
Gas Connection
FP1978

62D4037
20
CHECKING GAS PRESSURE
1. Check gas type. The gas supply must be the same as stated on the appliance’s rating decal. If
the gas supply is different from the fireplace, STOP! Do not install the appliance. Contact your
dealer immediately.
2. To ease installation, a 30” (762 mm) flex line with manual shut-off valve has been provided
with this appliance. Install and attach 1/2” gas line onto shut-off valve.
3. After completing gas line connection, purge air from gas line and test all gas joints from the
gas meter to the fireplace for leaks. Use a solution of 50/50 water and soap or a gas sniffer.
4. To adjust flame height, turn HI/LO knob to HI to get maximum pressure to burner. Turn HI/LO
knob to LO to get minimum pressure.
5. To check gas pressures at valve, turn captured screw counterclockwise 2 or 3 turns and then
place tubing to pressure gauge over test point. Turn unit to high. Figure 18. After taking pres-
sure reading, be sure and turn captured screw clockwise firmly to reseal. Do not over torque.
Check test points for gas leaks.
WARNING
Do not use open flame to check for gas
leaks.


Pressure
Test “IN”
Pressure Test
“OUT”
HI/LO Knob
Pilot Adjustment Screw
FP1979
Figure 18 -
Gas Pressure Check at Gas Valve