Monessen Hearth MDV500, MDV600 User Manual

MDV SERIES

DIRECT VENT GAS FIREPLACE

INSTALLATION AND OPERATING

INSTRUCTIONS

MODELS: MDV500 and MDV600

WARNINGS

IF THE INFORMATION IN THESE INSTRUCTIONS ARE
NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION
MAY RESULT CAUSING PROPERTY DAMAGE,
PERSONAL INJURY OR LOSS OF LIFE.

– Do not store or use gasoline or other flammable

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 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.

WARNING: Improper installation, adjustment, alteration,
services or maintenance can cause injury or property
damage. Refer to this manual. For assistance or
additional information consult a qualified installer,
service agency or the gas supplier.

This appliance may be installed in an OEM installation
in manufactured home (USA only) or mobile home and
must be installed in accordance with the manufacturer's
instructions and the manufactured home construction
and safety standard, Title 24 CFR, Part 3280 or Standard

for Installation in Mobile Homes. CAN/CSA Z3-240MH.

This appliance is only for use with the type(s) of gas
indicated on the rating plate unless a certified kit is
used.

WARNINGS

DUE TO HIGH TEMPERATURES, THE
APPLIANCE SHOULD BE LOCATED OUT OF
TRAFFIC AND AWAY FROM FURNITURE AND
DRAPERIES.

CHILDREN AND ADULTS SHOULD BE
ALERTED 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
MATERIAL SHOULD NOT BE PLACED ON
OR NEAR THE APPLIANCE.

KEEP THE ROOM AREA CLEAR AND
FREE FROM COMBUSTIBLE MATERIALS,
GASOLINE, AND OTHER FLAMMABLE
VAPORS AND LIQUIDS.

READ BEFORE INSTALLING. SAVE THESE INSTRUCTIONS

CONTENTS

Thank you and congratulations on your purchase of a

Monessen Hearth Systems 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 ............................. 6

Installing Above 2000 Feet............................ 6

Orifice Sizes, Pressures and BTUs ............... 6

Before You Start............................................ 6

Fireplace Framing ......................................... 7

Fireplace Dimensions.................................... 8

Fireplace Location ......................................... 9

Securing Fireplace to Floor or Framing ....... 10

Clearances ...................................................... 11

Installation Information .................................. 12

Vent Installation .............................................. 13

Installation Precautions ............................... 13

Optional Top Vent Application..................... 14

Installation Planning .................................... 15

Installation for Vertical Termination ............. 15

For Horizontal Termination.......................... 16

How to Use a Vent Graph ........................... 17

Rear Wall Vent Installation .......................... 18

Horizontal (Through-the-Wall) Termination

Configurations ............................................. 21

Horizontal with Vertical Rise

(Through-the-Wall) Applications.................. 22

Below Grade Installation ............................. 23

Vertical Through-the-Roof Installation......... 24

Installation for Vertical Termination ............. 26

Flat Ceiling Installation ................................ 26

Fireplace Installation ...................................... 28

Check Gas Type ......................................... 28

Installing Gas Piping to Fireplace Location . 28

Checking Gas Pressure ................................. 30

Electrical Installation...................................... 31

Electrical Wiring .......................................... 31

Remote Wall Mounted Switch ..................... 31

Electronic Pilot Ignition Wiring..................... 32

Remote Wall Mounted Switch ..................... 32

Optional DC Remote System ...................... 32

Canopy Installation and Glass Removal ...... 33

Brick Installation............................................. 34

Logs and Rock Wool Installation .................. 35

Operating Instructions - Millivolt ................. 38

What To Do If You Smell Gas ..................... 38

Lighting Pilot for the First Time ................... 38

Lighting Pilot - Millivolt................................. 39

Lighting Burner - Millivolt ............................. 40

To Turn Off Gas - Millivolt ........................... 40

Operating Instructions - Electronic Ignition 41

Lighting Electronic Ignition .......................... 41

To Turn Off Gas - Electronic Ignition........... 41

Cleaning and Maintenance ............................ 42

Burner, Pilot and Control Compartment ...... 42

Burner Flame .............................................. 42

Vent System ................................................ 43

Glass Door .................................................. 43

Logs ............................................................ 43

Rock Wool .................................................. 43

Replacement Parts ......................................... 44

Vent Components for 4"x6

Vent Components for 5"x8" ......................... 45

Firebox Components ................................... 46

Logs ............................................................ 47

Additional Accessories ............................... 48

Standing Pilot - Millivolt Control .................. 50

Electronic Ignition ........................................ 52

Troubleshooting ............................................. 54

5

/8" ..................... 44

For Massachusetts Residents Only .............. 56

Warranty ...........................................Back Cover

2 75D2523

IMPORTANT SAFETY INFORMATION

INSTALLER

Please leave these instructions with the appliance.

• 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

WARNING

fire, burns, explosions, electrical shock and carbon monoxide poisoning.

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.

CARBON MONOXIDE POISONING: Early signs of
carbon monoxide poisoning are similar to the flu 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 disease or anemia, those under the
influence of alcohol, and those at high altitudes.

Propane/LP gas and natural gas are both odorless. An odor­making 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.

OWNER

Please retain these instructions for future reference

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 ignition. 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. 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 cir-

culating air passages clean. More frequent cleaning may
be needed due to excessive lint and dust from carpeting,
bedding material, pet hair, 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 42.

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.

Continued on page 4

.

75D2523 3

IMPORTANT SAFETY INFORMATION

Continued from page 3

12. Do not use this fireplace to cook food or burn paper or
other objects.

13. Never place anything on top of fireplace.

14. Do not use any solid fuels (wood, coal, paper, cardboard,
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. Do not use fireplace if any part has been under or exposed
to, water. Immediately call a qualified service techni­cian to inspect the appliance and replace any part of
the control system and any gas control which has been
submerged in water.

19. Do not operate fireplace if any log is broken.

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
manufacturing 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 ten (10) hours the first time you use it. Place
the fan switch in the “OFF” position during this time.

We suggest that our gas hearth
products be installed and
serviced by professionals who
are certified in the U.S. by the
National Fireplace Institute

®

(NFI) as Gas Specialists.

www.nficertified.org

20. Do not use a blower insert, heat exchanger insert, or
any other accessory not approved for use with this fire­place.

21. Do not operate the fireplace with glass door removed,
cracked, or broken.

22. Massachusetts residents only see pages 56 and

Never connect unit to private
(non-utility) gas wells. This gas is
commonly known as wellhead gas.

WARNING

57.

4 75D2523

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 is approved for bed-

room 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, CAN/CGA B149 in Canada.

• This appliance is mobile home

approved.

• The appliance must be properly con-

nected to a venting system.

• The appliance is not approved for

closet or recessed installations.

Hood

Insulation

Board

1

/2"
Nailing
Flange

WARNING

Do not remove

insulation board.

5

/8"
Nailing
Flange

Hi/Lo Knob

Off/Pilot/On Knob

On/Off/RS Switch

Ignitor

Figure 1 - MDV500 and MDV600 Fireplace

(Millivolt Unit Shown —

Also Available in Electronic Ignition)

Blower Control

Optional Remote

Receiver

1

/2" Nailing

Flange

CODE APPROVAL

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:

LISTED VENTED GAS FIREPLACE HEATER

TESTED TO: ANSI Z21.88-2005/CSA 2.33-2005 STANDARDS

A manufactured home (USA only) or mobile home OEM installation must conform with the Manufactured Home Con­struction and Safety Standard, Title 24 CFR, Part 3280, or when such a standard is not applicable, the Standard for

Manufactured Home Installations, ANSI/NCSBCS A225.1, or Standard for Gas Equipped Recreational Vehicles and
Mobile Housing, CSA Z240.4.

75D2523 5

PRE-INSTALLATION INFORMATION

INSTALLING ABOVE 2000 FEET

• In the USA, the appliance must be derated 4% for every 1,000 ft above 2,000 ft elevations.

• In Canada, these appliances are certified for altitudes of 0 – 2000 ft, and must be de-rated by 10 percent for installations
between 2000 and 4,500 ft. (derate an additional 4% for every 1,000 ft. above 4,500 ft. elevations).

If the heating value of the gas has been reduced, these rules do not apply. To identify the proper orifice size, check with local
gas utility.

If installing this appliance at an elevation above 4,500 feet (in Canada), check with local authorities.

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" Minimum Supply Pressure 11"

Model Number

Max. Btu/hr Input 30,000 30,000 32,000 32,000
Min. Btu/hr Input 21,500 23,500 22,000 26,000
Burner Orifice size (as shipped) 7/64" #51 #34 #50

Natural Propane Natural Propane

MDV500 MDV600

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) • Fasteners • Front Floor Brick Assembly

• White Toggle Switch • Rock Wool • Non-Combustible Panel

• Log Set • Switch Cover Plate

• Canopy • Restrictor Plate/Disc (2 each)

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/LPG

• Square (Resistant to Sulfur Compounds)

• Pipe Wrench

6 75D2523

PRE-INSTALLATION INFORMATION

FIREPLACE FRAMING

Firebox framing can be built before or after the appliance is set in place. Construct firebox framing following Figure 2 and
the chart below for your specific installation requirements. See Figure 3 on Page 8 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.

Do not fill spaces around firebox with
insulation or other materials. This
could cause a fire.

WARNING

H

C

D

F

MDV500 MDV600

A421/16"48
B461/2"46
C323/4"38
D163/8"19
E731/2"79

F363/4"39
G203/8"20
H 52" 561/4"

1

1

3

3

1

3

3

/16"

/2"
/4"
/8"
/2"
/4"
/8"

1

/2" or 5/8"

B

A
E

Corner Installation

G

C

A

Inside Chase Installation

C

G

1

5

"

"

G

1

/2" or 5/8"

A

A

Recessed Installation

Stud Location

Figure 2 - Framing Dimensions

75D2523 7

PRE-INSTALLATION INFORMATION

FIREPLACE DIMENSIONS

B

F

3

20

/4"

149/16"

A

Ref. to Framing

22

5

/16"

MDV500 MDV600

A4113/16"4713/16"
B323/16"38

3

/16"
C3215/16"3815/16"
D 36" 42"
E 41" 47"
F161/8"19

1

/8"

5

/16"

46

Ref. to

Framing

427/16"

Ref. to

Wall

5"

34

1

23
/2"

3

/16"

2

15

2"

1

/2"

/16"

5

/8"

1

/2"

1

/2"

5

/8"

C
D

3

3

/8"

E

Ref. to Wall

Figure 3 - MDV500 Fireplace Dimensions

3

/8"

40

5

34

/8"

to

Center

of Pipe

3

7

/8"

1

12

/16"

8 75D2523

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 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 must be maintained.

• This fireplace may be installed along a wall, across a corner, or use an exterior chase. See 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 not 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 configurations.

• 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.

A Flat on Wall
B Cross Corner

E

Y

A

B

C Island**
D Room Divider*

C

X

E Flat on Wall Corner*
F Chase Installation

D

Y

Y 6" Minimum

F

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'. See Installing Horizontal Termination Configuration on pages 20 through 22.

* When you install your fireplace in (D) room divider or (E) flat on wall corner positions (Y), a minimum of 6"

clearance must be maintained from perpendicular wall and front of fireplace.

75D2523 9

SECURING FIREPLACE TO FLOOR OR FRAMING

The fireplace must be secured to the floor and/or to framing studs as shown in Figure 5 . 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 or nail­ing flanges are designed to accommodate two thickness of wall boards (

Framing

Screws

1

/2" or 5/8").

Framing

Nail Flange

Screws

Screws

Screws

Nail Flange

Screws

Figure 5 - Securing Fireplace to Floor and Framing Studs

10 75D2523

CLEARANCES TO COMBUSTIBLES

Follow these instructions carefully to ensure safe installation. Failure to follow
in struc tions 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 ex tend ing full width

WARNING

and depth of the appliance.

CLEARANCES

72" minimum

Side wall

12"

maximum

Combustible mantle

12"

103/4"

12" minimum

12"

Wall

Stud

Insulation

Board

10"

8"

6"

4"

1

/2"

1

/4"

7"

2

6"

1

/2"

9

8

Side View

6" minimum from

both side walls

FIREPLACE

COMBUSTIBLE

MATERIAL

AREA

WAL L

Figure 6 - Clearances from the Mantel,

Ceiling, and Side Wall

1"

1.5"

1.5"

3.5"

3.5"

4.5"

3"

5"

6"

45°

MANTEL CLEARANCES

NOTE: The combustible area around the fireplace must
not protrude more than 1/2" from the facing. If it does, it is

HOOD

2.5"

Top View

considered a mantel and must meet the mantel requirements
listed in this manual.

75D2523 11

Figure 7 - Mantel Clearances

INSTALLATION INFORMATION

FINISHING MATERIAL

NOTE: Any remote wiring (i.e. remote control, wall switch, and optional fan) must be done prior to final
finishing to avoid costly reconstruction.

Never obstruct or modify the air inlet
or outlet grills (louvers). This may
create a fire hazard.

WARNING

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.

VENT INSTALLATION

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.

WARNING

Failure to follow these instructions
will void the warranty.

NOTICE

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 the 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 Monessen Hearth Systems

• Installation other than permitted by these instructions.

12 75D2523

VENT INSTALLATION

This fireplace must be vented to the outside. The venting system must NEVER be
attached to a chimney serving a separate solid fuel burning appliance. Each gas
appliance must use a separate vent system. Do not use common vent systems.

WARNING

Horizontal sections of this vent system
require a minimum of 3" clearances to
combustibles at the top of the flue and 1"
clearance at the sides and bottom until the
flue penetrates the outside wall. A minimum
1" clearance all around the flue is acceptable
at this point of penetration.

WARNING

WARNING

Vertical sections of this vent system require
a minimum of 1" clearance to combustibles
on all sides of the pipe.

A Minimum of 3" Clearance

to the Top Is Required Along

Horizontal Length until Flue

Pipe Penetrates Outside Wall.

3"

1"

1"

A Minimum 1"

Clearance to

Combustibles

Permitted All

Around Flue at

Outside Wall

Figure 8 - Combustible Clearances for Vent Pipe

75D2523 13

VENT INSTALLATION

OPTIONAL TOP VENT APPLICATION

The appliance is shipped as a rear vent unit. If the installation
layout requires the unit to be a top vent configuration the appli­ance can be converted by following the steps below.

When removing and refitting the plates and adapter be sure the
associated gaskets are undamaged and refitted as required.

1. Remove the eight (8) screws securing the flue pipe adapter
to the fireplace body. See Figure 9.

2. Set the flue pipe adapter aside, complete with the gasket.
Do not damage the gaskets as the adapter and gasket must
be refitted.

3. Remove the eight (8) screws securing the flue pipe cover to
the top of the intake box and remove the cover and gasket.

See Figure 9.

4. Remove six (6) screws securing the flue pipe to the back
of the intake box and remove the pipe and gasket. See

Figure 10.

5. Replace flue pipe to top of firebox. Ensure the gasket is
in place and undamaged. Secure with six (6) screws. See

Figure 11.

6. Place the flue pipe cover and gasket removed in step 3
over the flue opening in bottom of the intake box.

After conversion to top vent
configuration the 5" (127mm) flue
pipe should be concentric with the 8"
(203mm) outer collar within

WARNING

Flue Pipe

Flue Pipe

Adapter

Cover

1

/4".

Screws

7. Refit the flue pipe adapter and gasket to the top of fire­place. Secure the adapter with six (6) screws removed in
step 1.

Flue

Cover

Flue Pipe

Screws

Figure 9 - Removing sixteen (16) Screws from

Flue Pipe Adapter and Flue Pipe Cover

Flue Pipe

Screws

Figure 10 - Removing Flue Pipe

14 75D2523

Figure 11 - Attaching Flue Pipe to Top

Vent Configurations

VENT INSTALLATION

INSTALLATION PLANNING

There are two basic types of direct-vent installation:

• Horizontal Termination

• Vertical Termination

It is important to select the proper length of vent pipe for the type of termination you choose. It is also important to note the
wall thickness.

FOR HORIZONTAL TERMINATION

Select the amount of vertical rise desired. All horizontal run
of venting must have
the termination.

1

/4" rise for every 12" of run towards

Never run the vent pipe level or
downward. This may cause excessive
temperatures which could cause

You may use up to three 90° elbows in this vent configura­tion. See Horizontal Termination Configurations on pages
20 and 21.

FOR VERTICAL TERMINATION

Measure the distance from the fireplace floor to the ceiling. Add the ceiling thickness, the vertical rise in an attic or second
story, and allow for sufficient vent height above the roof line.

NOTE: You may use two 45° elbows in place of a 90° elbow. You must follow rise to run ratios when using
45° elbows. The appliance is approved for use with three 90° elbows maximum or a combination of 90°
and 45° elbows up to a maximum of 270°.

For two-story applications, firestops are required at each floor level. If an offset is needed in the attic, additional pipe and
elbows will be required.

You may use a chase with a vent termination with exposed pipe on the exterior of the house. See Installing Vent System in
a Chase below. If pipe is enclosed in chase, it is not exposed.

It is very important that the venting system maintain its balance between the combustion air intake and the flue gas exhaust.
Certain limitations apply to vent configurations and must be strictly followed.

INSTALLING A VENT SYSTEM IN AN OUTSIDE CHASE

a fire.

WARNING

A chase is a vertical boxlike structure built to enclose venting that runs along the outside of a building. A chase is required
for such venting.

Treatment of firestops and construction of the chase may vary from building type
to building type. These instructions are not substitutes for the requirements of local
building codes. You must follow all local building codes.

NOTICE

When installing in a chase, you should insulate the chase as you would the outside
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

75D2523 15

VENT INSTALLATION

Inside Corner Detail FOR HORIZONTAL TERMINATION

G

V

H

D

E

B

L

Vent Terminal Air Supply Inlet Area Where Terminals Not Permitted

V

C

Fixed

V

Closed

F

Operable

V

B

A

BB

B

Opera-

ble

V

A

V

Fixed

Closed

J

V

A

B

Figure 12 - Horizontal Vent Termination Location

MINIMUM DISTANCES

A = Clearance above the grade, a veranda, porch, deck, or balcony [*12" (305mm) minimum].
B = Clearance to window or door that may be opened [*12" (305mm) minimum].
C = Clearance to permanently closed window [*minimum 12" (305mm) recommended to prevent condensation on

window]

D = Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of two (2) feet (610mm)

from the centerline of the terminal [18" (457mm) minimum].
E = Clearance to unventilated soffits [12" (305mm) minimum]. Clearance to vinyl soffit [30" (762mm)].
F = Clearance to an outside corner. See Figure 13, page 17.
G = Clearance to an inside corner. See Figure 13, page 17.
H = *Not to be installed above a gas meter/regulator assembly within three (3) feet (914mm) horizontally from the centerline

of the regulator.
I = Clearance to service regulator vent outlet [*3' (914mm) minimum].
J = Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other appliance [*12" (305mm)

minimum].
K = Clearance to a mechanical air supply inlet [*6' (1829mm) minimum].
L = Clearance above a paved sidewalk or paved driveway located on public property [**7' (2133mm) minimum].
M = Clearance under veranda, porch, deck, or balcony. See Figure 13, page 17. [For Canada *12" (305mm)

minimum

***

].

* As specified in CAN/CGA B149 Installation Codes. Note: Local codes or regulations may require different

clearances.
** A vent must 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 of two sides beneath the floor.

A

G

I

M

V

A

K

A

Always maintain minimum clearances around vent systems. The minimum clearances
to combustibles for horizontal vent pipe are 3" at the top and 1" at the sides and bottom
of the vent system until the pipe penetrates the outside vertical wall (1" required). A
1" minimum clearance all around the pipe must be maintained. Do not pack the open
air spaces with insulation or other materials. This could cause high temperatures and

WARNING

may present a fire hazard.

16 75D2523

TERMINATION CLEARANCES FOR BUILDINGS WITH COMBUSTIBLE
AND NONCOMBUSTIBLE EXTERIORS

VENT INSTALLATION

G

Combustible =
6” (152mm)

Noncombustible =

V

2” (51mm)

Inside Corner

V

Combustible =

F

6” (152mm)
Noncombustible =

2” (51mm)

Outside Corner

H

G

V

Combustible &

G = Combustible 24"(610mm)
Noncombustible 18"(457mm)

Balcony with No Side Wall Balcony with Perpendicular

Noncombustible
H = 24" (610mm)
J = 20" (508mm)

V

J

Side Wall

Figure 13 - Allowable Venting Chart

HOW TO USE THE VENT GRAPH

The Vent Graph should be read in conjunction with the following
vent installation instructions to determine the relationship 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 dimension on the
Sidewall Vent Graph below, 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 fireplace in

accordance with same.

Example A: If the vertical dimension from the floor of the

fireplace is 11' (3.4m) the horizontal run to the face of the
outer wall must not exceed 14' (4.3m).

Example B: If the vertical dimension from the floor of the

unit is 7' (2.14m), the horizontal run to the face of the
outer wall must not exceed 8

Sidewall Vent Graph showing the relationship between vertical and
horizontal dimensions for a Direct Vent flue system.

1

/2' (2.6m).

D

C

C

V

E

C = Maximum depth of 48" (1219mm)
for alcove location
D = Minimum width for back wall of
alcove location
Combustible - 38" (965mm)
Noncombustible - 24" (610mm)
E = Clearance from corner in alcove
location
Combustible - 6" (152mm)
Noncombustible - 2" (51mm)

Alcove Location

40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10

8
6
4
2

Horizontal Dimension From the Outside Face of the Wall

Dimensions in

Feet

eg: A

2 4 6 8 10 12 14 16 18 20

to the Back of the Fireplace

Vertical Dimension From the Floor of Unit to the Center of the

Horizontal Vent Pipe

Figure 14 - Rear Wall Venting Graph

75D2523 17

VENTING INSTALLATION

REAR WALL VENT INSTALLATION (5"X8" VENTING ONLY)

When installed as a rear vent unit this appliance may be vented directly to a termination located on the rear wall behind
the appliance

• The maximum horizontal distance between the rear of the appliance and the termination is 20" (508 m). See

Figure 15.

• Only one 45° elbow is allowed in these installations.

Female

Maximum

20"

Top View Flat Installation

Figure 15 - Rear Vent Application,

Maximum Horizontal Distance

1. Rigid vent pipes and fittings have special
twist-lock connections. Assemble the desired
combination of pipe and elbows to the appli­ance adaptor.

Twist-lock Procedure: The female ends

of the pipes and fittings have three locking
lugs (indentations). These lugs will slide
straight into matching slots on the male end of
adjacent pipes and fittings. Push the pipe sec­tions together and twist one section clockwise
approximately one-quarter turn until the sec­tions are fully locked. See Figure 16.

Figure 16 - Rigid Vent Pipe Connections

101/2"

(267mm)

Locking Lugs

Note: Horizontal runs of vent
must be supported every three
feet (914mm). Use wall straps
for this purpose.

Male Slots

2. See venting and termination instructions for
further instructions.

3. Locate and cut the vent opening in the wall.
For combustible walls first frame in opening.

Combustible Interior Walls: Cut a 12

1

/2"H x

101/2"

(267mm)

Combustible

Wall

101/2" W hole through the interior wall.

Combustible Exterior Walls: Cut a 10

1

/2"H
x 101/2"W square hole through the exterior
wall frame. See Figure 17.

Noncombustible Walls: Hole opening should

be 81/2" (216mm) in diameter.

81/2"

(216mm)

Noncombustible

Wall

4. The center of the hole should line up with the
center line of the horizontal rigid vent pipe

1

end. Allow

/4" minimum rise per foot. See

Figure 17 - Exterior Wall Framing Dimensions

Figure 17.

18 75D2523

REAR WALL VENT INSTALLATION (continued)

4. Apply a bead of non-hardening mastic around the outside
edge of vent cap. Position the vent cap in the center of hole
on the exterior wall with the word “UP” on the vent cap
facing up. Insure proper clearance of 1" to combustibles
is maintained. Attach the vent cap with four wood screws
supplied. See Figure 18.

Do not recess vent termination
into any wall. This will cause a
fire hazard.

WARNING

VENT INSTALLATION

Vent Cap

HOT

Wood

Screw

Apply Mastic to

All Four Sides

NOTE: Replace the wood screws with appropriate
fasteners for stucco, brick, concrete, or other types
of siding.

For vinyl siding, stucco, or wood exterior use vinyl siding
standoffs between vent cap and exterior wall for Simpson or
Selkirk Terminations only. The vinyl siding standoff prevents
excessive heat from melting the vinyl siding material. N

OTE:

Monessen Termination does not require standoff. Bolt the
vent cap to the standoff or wall. Apply non-hardening mastic
around outside edge of the standoff instead of the vent cap
assembly. Use wood screws provided to attach the standoff.

See Figure 19.

5. Slide the wall thimble over the vent pipe before connecting
the horizontal run to the vent cap. See Figure 20.

6. Carefully move the fireplace with vent assembly attached
toward the wall and insert the vent pipe into the horizontal
termination. The pipe overlap should be a minimum of

1

/4". Apply silicone to the outer pipe connection. Fasten

1
all vent connections with screws provided.

7. Slide the wall thimble against the interior wall surface and
attach with screws. See Figure 20 .

Figure 18 - Installing Horizontal Vent Cap

Cut Vinyl Siding Away to Fit

Standoff or Termination

Standoff #1250 or

5DT-VS

(Not Required

for Monessen

Termination)

Termination

Apply

Mastic to

OT

H

All Four

Sides

Nut

Wood Screw

Figure 19 - Installing Vinyl Siding Standoff

and Termination

Interior Wall

Surface

Bolt

Fire Stop

Assembly

For more information, follow
instructions that comes with
terminations.

NOTICE

Figure 20 - Connecting Vent Cap with Horizontal Vent Pipe

75D2523 19

Vent Cap

(Horizontal

Termination)

Screw

Horizontal

Vent Pipe

VENT INSTALLATION

HORIZONTAL WITH VERTICAL RISE (THROUGH-THE-WALL) TERMINATION
CONFIGURATIONS

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 Vent Graph, showing the relationship between vertical and horizontal side wall venting, will help to determine the vari­ous dimensions allowable. See page 17.

Minimum clearance between vent pipes and combustible materials is 3" on top and 1" from bottom and sides unless
otherwise noted (Exception: Outside wall with firestop: 1" all around pipes are allowed).

When vent termination exits through foundations less than 20" below siding outcrop, the vent pipe must flush up with
the siding.

It is 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 (or the top of the transition
elbow) to the face of the outer wall or the mounting flange of the termination.

When installing the appliance as a rear vent unit, the 90° 45° transition elbow
attached directly to the rear of the unit is NOT INCLUDED in the following criteria and
calculations, and unless specifically mentioned should be ignored when calculating
venting layouts.

WARNING

• The maximum number of 90° elbows per side wall installation is three (3). See Figure 21.

• If a 90° elbow is fitted directly on top of the fireplace flange, the maximum horizontal vent run before the termination
or a vertical rise is 36" (914mm). See Figure 22.

3 x 90°

Elbows

3 x 90°
Elbows

36"

Max.

36"

Max.

Figure 21 - Maximum Three (3) 90° Elbows

Per Installation

20 75D2523

Figure 22 - Maximum Horizontal Run with No Rise

VENT INSTALLATION

HORIZONTAL (THROUGH-THE-WALL)
TERMINATION CONFIGURATION (Continued)

• If a 90° elbow is used in the horizontal vent run (level height
maintained) the horizontal vent length is reduced by 36"
(914 mm) (Fig. 21 A and B) This does not apply if the 90°
elbows are used to increase or redirect a vertical rise. See

Figure 24.

Example: According to the vent graph (page 17) the
maximum horizontal vent length in a system with a 7.5'
vertical rise is 20’ (6m) and if a 90° elbow is required in
the horizontal vent it must be reduced to 17' (5.2 m).

In Figures 23 and 24, Dimension A plus B must not be greater
than 17' (5.2m).

• The maximum number of 45° elbows permitted per side
wall installation is two (2). 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" (45cm). 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°.

See Figure 25.

B

A

10'

7'

90°

A

7'6"

Figure 23 - Horizontal Run Reduction

Example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°

1

B

2

3

4

Horizontal 90° Elbow = 3' Reduction

7'6"

A + B = 17' Maximum

1 + 2 + 3 + 4 = 270°

Figure 24 - Maximum Vent Run with Elbows

75D2523 21

Figure 25 - Maximum Elbow Usage

1

2

3

4

VENT INSTALLATION

HORIZONTAL WITH VERTICAL RISE (THROUGH-THE-WALL) APPLICATIONS

1. Locate and cut the vent opening in the wall.
For combustible walls first frame in opening.

Combustible Interior Walls: Cut a 12

1

/2" W hole through the interior wall.

10

Combustible Exterior Walls: Cut a 10

1

x 10

/2"W square hole through the exterior

1

/2"H x

1

/2"H

wall frame. See Figure 17.

Noncombustible Walls: Hole opening should

be 81/2" (216mm) in diameter.

2. The center of the hole should line up with the
center line of the horizontal rigid vent pipe

1

end. Allow

/4" minimum rise per foot. See

Figure 26.

You may use a reducer from 5"x8"

5

to 4"x6

/ 8" for horizontal with
vertical rise applications. ONLY
use framing instructions below

5

when using 4"x6

/ 8" venting.

If the reducer is installed at the rear
of the unit, you must immediately
follow with a 90° elbow for a
vertical rise before continuing

WARNING

with any horizontal run. There is
a minimum total height of 7 feet
from the fireplace floor to the last
section of pipe. Refer to graph
on page 17.

101/2"

(267mm)

101/2"

(267mm)

81/2"

(216mm)

Combustible

Wall

Noncombustible

Wall

Figure 26 - Exterior Wall Framing Dimensions for 5"x8"

NOTE: #1222DA reducer must be used when 4x65/8" venting

is preferred. Reducer must be installed directly onto
unit at pipe adaptor before vertical rise.

91/2"

(241mm)

1. Locate and cut the vent opening in the wall.
For combustible walls first frame in opening.

Combustible Interior Walls: Cut a 11

1

/2"H x

91/2" W hole through the interior wall.

Combustible Exterior Walls: Cut a 9

1

/2"H

91/2"

(241mm)

33/4"

(92mm)

x 91/2"W square hole through the exterior
wall frame. See Figure 16.

Noncombustible Walls:Hole opening should

be 71/2" (190mm) in diameter.

71/2"

(190mm)

2. The center of the hole should line up with the
center line of the horizontal rigid vent pipe

1

end. Allow

Figure 27.

/4" minimum rise per foot. See

Figure 27 - Exterior Wall Framing Dimensions

for 4"x65/8"

22 75D2523

VENT INSTALLATION

BELOW GRADE INSTALLATIONS

When it is not possible to meet the required vent terminal clearances of 12" above grade level, a snorkel kit is recommended.
It allows installation depth down to 7" (178mm) below grade level. The 7" (178mm) is measured from the center of the
horizontal vent pipe as it penetrates through the wall.

Ensure that sidewall venting clearances are observed. If venting system is installed below ground, we recommend a
window well with adequate and proper drainage to be installed around the termination area.

If installing a snorkel, a minimum 24" vertical rise is necessary. The maximum horizontal run with the 24” vertical pipe is
36". This measurement is taken from the collar of the fireplace (or transition elbow) to the face of the exterior wall. See the
Sidewall Venting Graph for extended horizontal run if the vertical exceeds 24".

1. Establish vent hole through the wall. See Figure 17, page 18.

2. Remove soil to a depth of approximately 16" below base of snorkel. Install drain pipe. Install window well (not supplied).
Refill hole with 12" of coarse gravel leaving a clearance of approximately 4" below snorkel. See Figure 28.

3. Install vent system.

4. Ensure a watertight seal is made around the vent pipe coming through the wall.

5. Apply high temperature sealant caulking (supplied) around the 5" and 8" snorkel collars.

6. Slide the snorkel into the vent pipes and secure to the wall.

7. Level the soil so as to maintain a 4" clearance below snorkel. See Figure 28.

• Do not back fill around snorkel.

• A clearance of at least 4" must be
maintained between the snorkel and
the soil.

WARNING

If the foundation is recessed, use recess brackets (not supplied) for securing lower portion of the snorkel. Fasten brackets to
wall first, then secure to snorkel with self drilling #8x1/2 sheet metal screws. It will be necessary to extend vent pipes out as
far as the protruding wall face. See Figure 29.

Screws

Firestop

24"

Minimum

Foundation Wall

Minimum

4" Clearance

Ground

Window Well

Gravel

Drain

Foundation

Recess

Watertight Seal

Around Pipe

Snorkel

Wall Screws

Sheet Metal

Screws

Figure 29 - Snorkel Installation,

Figure 28 - Below Grade Installation

75D2523 23

Recessed Foundation

VENT INSTALLATION

VERTICAL THROUGH-THE-ROOF APPLICATIONS

A restrictor disc must be installed
on any vertical termination that
is higher than 12'.

NOTICE

Install restrictor disc as shown in Figure 30 for vertically vented applications.

Up to three (3) restrictor discs may be needed for 40' installation.

The two (2) restrictor discs suppled will work for most installations. If a third disc is needed order Part No. 56D3027.

5

You may use a reducer to 4"x6

/8" in vertically vented applications.

Restrictor

Disc

Stove Collar

Figure 30 - Installing Restrictor Disc into Stove Collar

24 75D2523

VERTICAL THROUGH-THE-ROOF APPLICATIONS (continued)

This Gas Fireplace has been approved for,

• Vertical installations up to 40' (12m) in height. Up to a 10' (3m)
horizontal vent run can be installed within the vent system
using a maximum of two 90° elbows. See Figure 31.

40' Maximum Height

8' Minimum Height

Support Straps

10'

Maximum

Every 3'

40' Maximum Height

8' Minimum Height

VENT INSTALLATION

Support

10'

Maximum

Support Straps

Every 3'

Straps

Every

5'Vertical

Figure 31 - Support Straps for Horizontal Runs

• Up to two 45° elbows may be used within the
horizontal run. For each 45° elbow used on the
horizontal plane, the maximum horizontal length
must be reduced by 18" (450mm).

Example: Maximum horizontal length

No elbows = 10’ (3m)

1x45° elbows = 8.5’ (2.6m)

2x45° elbows = 7’ (2.1m)

• A minimum of an 8' (2.5m) vertical rise is
required.

• Two sets of 45°elbows offsets may be used within
the vertical sections. From 0 to a maximum of 8'
(2.5 m) of vent pipe can be used between elbows.

See Figure 32.

• Determine the roof pitch and use the appropriate
starter kit for offset installation.

• The maximum angular variation allowed in the
system is 270°. See Figure 32.

1

2

3

4

Example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°

1

2

3

4

• The minimum height of the vent above the high­est point of penetration through the roof is 1'
(305mm).

75D2523 25

Figure 32 - Maximum elbow Usage

VENT INSTALLATION

INSTALLATION FOR VERTICAL TERMINATION

1. Determine the route your vertical venting will take. If ceiling joist,
roof rafters or other framing will obstruct the venting system,
consider an offset. See Figure 33 to avoid cutting load bearing
members.

Roof

Flashing

NOTE: Pay special attention to these installation instructions
for required clearances (air space) to combustibles when
passing through ceilings, walls, roofs, enclosures, attic
rafters, etc. Do not pack air spaces with insulation. Also
note maximum vertical rise of the venting system and any
maximum horizontal offset limitations. Offsets must fall
within the parameters shown in Figure 14, page 17.

2. Set fireplace in desired location. Drop a line plumb down from
the ceiling to the position of the flue exit. Mark the center point
where the vent will penetrate the ceiling. Drill a small locating
hole a this point.

Drop a plumb line from the inside of the roof to the ceiling locat-

ing hole in the ceiling. Mark the center point where the vent will
penetrate the roof. Drill a small locating hole at this point.

FLAT CEILING INSTALLATION

1

1. Cut a 10

/2" (267mm) square hole in the ceiling using the locat­ing hole as a center point The opening should be framed to
101/2"x101/2" (267mm x 267mm) inside dimensions as shown in
Figure 34 using framing lumber the same size as the ceiling joist.
If the area above the ceiling is an insulated ceiling or a room,
nail firestop from the top side. This prevents loose insulation
from falling into the required clearance space. See Figure 34.
Otherwise, install firestop below the framed hole. The firestop
should be installed with no less than three nails per side. See

Figure 35.

2. Assemble the desired lengths of pipe and elbows necessary to
reach from the burner system flue up through the firestop. Be sure
pipe and elbow connections are fully twist-locked. See Figure

16, page 18.

3. Cut a hole in the roof using the locating hole as a center point.
(Cover any exposed open vent pipes before cutting hole in roof).
The 10

1

/2"x10

1/

2

" (267mm x 267mm) hole must be measured on
the horizontal. Actual length may be larger depending on the pitch
of the roof. There must be a 1" minimum clearance from the vent
pipe to combustible materials. (Insulation should be considered
a combustible material) Frame the opening as shown in Figure

17 on page 18.

Wall

Strap

45° Elbows

Ceiling Firstop

Figure 33 - Offset with Wall Strap and 45°

Elbows

Nails

Firestop

Figure 34 - If area above is a room, install

firestop above framed hole as shown

10

"

1

10

2

/

1

/

2

"

4. Connect a section of pipe and extend up through the hole.

Nails

Firestop

Figure 35 - If area above is not a room, install

firestop below framed hole as shown

Continued on next page

26 75D2523

VENT INSTALLATION

INSTALLATION FOR VERTICAL TERMINATION--FLAT CEILING INSTALLATION (CONTINUED)

NOTE: If an offset is needed to avoid obstructions, you must support the vent pipe every three (3) feet.
Use wall straps for this purpose. See Figure 33, page 26. Whenever possible, use 45° elbows instead of
90° elbows. The 45° elbow offers less restriction to the flow of the flue gases and intake air.

5. Place the flashing over the pipe section(s) extending through the roof. Secure the base of the flashing to the roof and
framing with roofing nails. Be sure roofing material overlaps the top edge of the flashing. There must be a 1" clearance
from the vent pipe to combustible materials.

6. Continue to add pipe sections until the height of the vent cap meets the minimum requirements below.

NOTE: You must increase vent height for steep roof pitches. Nearby trees, adjoining roof lines, steep
pitched roofs, and other similar factors may cause poor draft or down-drafting in high winds. Increasing
the vent height may solve this problem.

NOTE: If the vent pipe passes through any occupied areas above the first floor, including storage spaces
and closets, you must enclose pipe. You may frame and sheetrock the enclosure with standard construction
material. Make sure to meet the minimum allowable clearances to combustibles. Do not fill any of the
required clearance spaces with insulation.

Figure 36 - Minimum chimney clearance

ROOF PITCH H (feet)

Flat to 6/12 1.0
Over 6/12 to 7/12 1.25
Over 7/12 to 8/12 1.5
Over 8/12 to 9/12 2.0

Over 9/12 to 10/12 2.5
Over 10/12 to 11/12 3.25
Over 11/12 to 12/12 4.0

*H = Minimum height from roof to lowest

discharge oopening of vent.

75D2523 27

FIREPLACE INSTALLATION

CHECK GAS TYPE

Use proper gas type for the fireplace you are installing. If you have conflicting gas type, do not install fireplace. See dealer
where you purchased the fireplace for proper fireplace according to your gas type.

INSTALLING GAS PIPING TO FIREPLACE LOCATION

INSTALLATION ITEMS NEEDED

Before installing fireplace and burner system, make sure you
have the items listed below.

A qualified installer or service
person must connect appliance to
gas supply. Follow all local codes.

• External regulator (supplied by installer) • Tee joint

WARNING

• 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

NPT tap is an acceptable alternative to test gauge connec­tion. Purchase the CSA design-certified equipment shutoff
valve from your dealer.

1

/8"

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

CAUTION

the burner system and propane/
LP supply.

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 37. Pointing the vent down protects it from freezing rain or sleet.

Use only new black iron or steel

External

Regulator

100 gal. (min)

Propane/LP

Supply Tank

pipe. Internally tinned copper or
copper tubing can be used per
National Fuel Code, section 2.6.3,
providing gas meets hydrogen
sulfide limits, and where permitted
by local codes. Gas piping system
must be sized to provide minimum

CAUTION

inlet pressure (listed on data plate)

Vent

Pointing

Down

Figure 37 - 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.

at the maximum flow rate (BTU/hr).
Undue pressure loss will occur if the
pipe is too small.

External regulators may be necessary
for natural gas. One- or two-pound
systems will damage this appliance
and may cause fire hazard.

WARNING

28 75D2523

FIREPLACE INSTALLATION

Only persons licensed to work with
gas piping may make the necessary
gas connections to this appliance.

WARNING

NOTE : The gas line connection may be made using
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, NFPA54. In Canada CAN/CGA-B149 (1 or

2) Installation Code.

A listed manual shutoff 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. See Figure 38.

IMPORTANT: Install main gas valve (equipment shutoff valve) in an accessible location. 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 shutoff valve to fireplaces.

1

/2" rigid tubing or an approved flex connector. Since

A manual shutoff 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.

CAUTION

See Figure 38.

Use pipe joint sealant that is
resistant to liquid petroleum

Apply pipe joint sealant lightly to male threads. This will prevent
excess sealant from going into pipe. Excess sealant in pipe could
result in clogged burner system valves.

(LP) gas.

CAUTION

We recommend that you install a sediment trap/drip leg in supply line as shown in Figure 38. 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 moisture 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.

Approved Flexible

Gas Line

Sediment Trap/Drip Leg

UL/CSA Design-Certified Equipment

Shutoff Valve with

Tee Joint
Pipe Nipple
Cap

1

/8" NPT Tap*

3" Minimum

Natural Gas

From Gas Meter

(4" W.C. to 10.5" W.C. Pressure)

Propane/LP

From External Regulator

(11" W.C. to 13" W.C. Pressure)

Figure 38 - Gas Connection

75D2523 29

CHECKING GAS PRES SURE

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 18" (457mm) flex line with
manual shut-off valve has been provided with on this
appliance. Install and attach
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 50/40 water
and soap or a gas sniffer.

1

/2" gas line onto shut-off

Pressure
Test “IN”

Pressure

Test “OUT”

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
counter clockwise 2 or 3 turns and then place tubing to
pressure gauge over test point. Turn unit to high. See
Figure 39. After taking pressure reading, be sure and
turn captured screw clockwise firmly to reseal. Do not
over torque. Check test points for gas leaks.

NOTE: Captured screws for pressure reading are

located in the same place in both valve
types — Millivolt and Electronic.

HI/LO

Knob

Figure 39 - Gas Pressure Check at Gas Valve

Pilot Adjustment

Screw

(Millivolt Valve Shown)

Do not use open flame
to check for gas leaks.

WARNING

30 75D2523

ELECTRICAL INSTALLATION

ELECTRICAL WIRING

This fireplace will work without any electrical supply except to operate blower and electronic ignition system.

NOTE: If installed in mobile home, fireplace must be bolted securely to floor.

Electrical connections should only be performed by a qualified, licensed electrician.
Main power must be off when connecting to main electrical power supply or performing
service. All wiring shall be in compliance with all local, city, and state codes. The
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

WARNING

70 (latest edition) and Canadian Electrical Code, CSA C22.1.

Label all wires before disconnecting when servicing controls. Wiring errors can cause
improper and dangerous operation.

CAUTION

Verify proper operation after servicing.

REMOTE WALL MOUNTED SWITCH (FOR MILLIVOLT VALVES ONLY)

A remote wall switch and up to fifteen (15) feet of 18 Ga. wire may be used with this appliance. Attach the wall switch in
a junction box at the desired location on the wall. See Figure 40. Do not extend beyond the wall switch wire length pro­vided.

NOTE: Extended lengths of wire may cause the fireplace not to function properly. Longer length of wire
is permitted if the wire is made out of larger gauge (diameter) wire. Always check with local code.

Do not connect
wall switch to AC
(110V) circuit.

WARNING

OPTIONAL WALL

SWITCH

ON

OFF

WHITE

RS

OFF

ON

Y

BLUE

PILOT

ON

OFF

BLACK

HI

LO

TH
TP

TH/TP

GRA

BLUE

BLACK

OPTIONAL REMOTE

RECEIVER

ON

RS

OFF

BLACK

Figure 40 - Wiring Diagram for Wall Switch

(Millivolt Units Only)

75D2523 31

ELECTRICAL INSTALLATION

ELECTRONIC PILOT IGNITION WIRING

Do not connect 110-120 VAC to the
Remote Wall Switch. The appliance
will malfunction.

WARNING

Ignition Module (Synetek)

15’ Wall Switch Wire

BLACK

WHITE

Pilot Assembly

Spark
Sense

WHITE

MAGENTA #5

#1 #2 #3 #4 #5 #6 7#

GRAY #7

RED #2

GREEN #6

BLACK #4

BLUE #1

RED #2

WHITE #3

Electronic Valve

HI

LO

EV1 EV2

WHITE

BLUE

To Junction Box

GREEN
BLACK

BLACK

Primary - 120V

Transformer

Secondary

24V

YELLOW

RS
OFF

Switch

ON

YELLOW

Figure 41 - Electronic Ignition System Wiring Diagram

REMOTE WALL SWITCH

Position the wall switch. Do not extend beyond the 15 feet of wire.

OPTIONAL DC REMOTE SYSTEMS

These instructions replace the section entitled Hearth Mount in the Millivolt hand held remote instructions supplied with
the remote.

1. Follow instructions on remote control to snap remote cover plate to remote receiver.

2. Connect the wire terminal from the remote receiver. This replaces the 15' wall switch connection to the switch. See
Figure 41.

3. Use screws that came with remote control to mount remote control receiver at junction box (for your wall switch) or at
control panel (when installation in unit is preferred).

32 75D2523

CANOPY INSTALLATION AND GLASS REMOVAL

Remove top louver assembly before installing canopy.

1. Unhook top louver assembly. Set aside. See Figure 42.

2. Attach canopy to underside of top outer shell with three (3) screws provided. See Figure 43.

3. Hook top louver assembly back into place.

Louver

Assembly

Canopy

Figure 42 - Removing

Top Louver Assembly

GLASS FRAME REMOVAL

1. Remove louver assembly from the top.

2. Release three (3) clamps on bottom of fireplace.

See Figure 44.

3. Tilt glass frame out and lift glass frame up until
it clears hook on top of fireplace.

4. Set glass frame aside.

Glass Frame

Each clamp
has a quick
spring
force. When
reinstalling
clamps, keep

CAUTION

fingers clear.

Screws

Figure 43 - Installing

Canopy

Clamps

Figure 44 - Removing Glass Frame

75D2523 33

BRICK INSTALLATION

BRICK INSTALLATION

1. Install fl oor brick before installing logs or rock wool.

2. Install the rear brick panel by sliding it over the existing bracket fastened to the rear of the fi rebox.

3. Remove the existing screws fastened to the sides of the fi rebox toward the tops.

4. Slide the right panel into place and secure the panel using one of the brackets provided with the kit and one of the screws
removed earlier.

5. Repeat step 3 for the left panel.

34 75D2523

LOGS AND ROCK WOOL INSTALLATION

1. Distribute one layer of rock wool to cover all round burner ports. Do not cover rectangular slots, located in front and
rear. See Figure 45.

Figure 45 - Rock Wool Placement on Rear of Burner.

2. Place the rear log by lining up the holes in the bottom of the rear log with the two pins located at the rear of the burner
on the bracket. See Figure 46.

Figure 46 - Installing Rear Log

Note: Placing rock wool on burner provides

glowing embers. For best results, pull the
rock wool apart into pieces the size of a
dime or smaller.

Do not use the entire bag of rock
wool to cover the burner. This could
cause the flame to burn poorly and
may lead to sooting.

WARNING

Continued

75D2523 35

LOG INSTALLATION

3. Place the left middle log by lining up the holes in the bottom of the log with the two pins located on the left side of the
burner. See Figure 47.

4. Place the right middle log by lining up the holes in the bottom of the log with the two pins located on the right side of
the burner. See Figure 48.

5. Place the front left log by setting the notch on the bottom of the log on the very far left tong of the grate, and resting the
right end of the log onto the second left tong of the grate. See Figure 49.

6. Place the front right log by setting the notch on the bottom of the log on the very far right tong of the grate and resting
the log on the leg of the grate. See Figure 50.

Figure 47 - Installing left middle log

Figure 49 - Installing left front log

Figure 48 - Installing right middle log

Figure 50 - Front right front log

Continued

36 75D2523

LOG INSTALLATION

7. Place the upper left log by matching the two protrusions on the rear and left middle logs with the notches on the bottom
of the upper left log. See Figure 51.

8. Place the upper middle log by matching the protrusions located at the middle of the rear log with the notch on the bottom
of the log. Rest the front end of the log on the right side of the middle tong of the grate. See Figure 52.

9. Place the upper right log by matching the two protrusions on the rear and right middle logs with the notches on the
bottom of the upper right log. See Figure 53.

Figure 51 - Installing upper left log

Figure 53 - Installing upper right log

Figure 52 - Installing upper middle log

75D2523 37

OPERATING INSTRUCTIONS - MILLIVOLT

FOR YOUR SAFETY READ BEFORE LIGHTING

If you do not follow these instruction
exactly, a fire or explosion may result
causing property damage, personal
injury or loss of life.

WARNING

A. This appliance is equipped with a pilot which must be lit with built-in ignitor while following these

instructions exactly.

B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the floor

because some gas is heavier than air and will settle on the floor.

WHAT TO DO IF YOU SMELL GAS:

• Turn off all gas to the appliance.

• Open windows.

• Do not attempt to light any appliance.

• Do not touch any electric 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.

C. Use only your hand to push in, or turn the gas control knob. Never use tools. If the knob will not push in

or turn by hand, don't try to repair it. Call a qualified service technician. Force or attempted repair may
result in a fire or explosion.

D. Do not use this appliance if any part of it has been under water. Immediately call a qualified service tech-

nician to inspect the appliance and to replace any part of the control system and any gas control that has
been under water.

LIGHTING PILOT FOR THE FIRST TIME

INITIAL LIGHTING

Purge air from the supply line as follows:

• Open main shutoff valve.

• Unscrew main pressure test point.

• Leave inlet test screw open until gas comes in.

• When gas is flowing, tighten inlet screw immediately.

LEAK TESTING

1. Follow the pipe from the gas supply line connection to the gas valve. Check connection for leaks with
soap and water mixture.

2. Next check for gas leaks at the burner with soap and water mixture.

Never use an open
flame to check for
gas leaks.

WARNING

3. Check the pilot for gas leaks with soap and water mixture.

Continued on next page

38 75D2523

LIGHTING PILOT FOR THE FIRST TIME - MILLIVOLT

APPROVED LEAK TESTING METHOD

OPERATING INSTRUCTIONS - MILLIVOLT

You may check for gas leaks with the following methods only:

• Soap and water solution

If using a soap and water
solution to test for leaks,
DO NOT spray solution

• An approved leak testing spray

• Electronic sniffer

Never check for gas leak with open flame!

NOTE: Remove any excessive pipe
compound from the connections.
Excessive pipe compound can set off
electronic sniffers.

onto control body.

WARNING

DANGER

Check for gas leaks in each of the following locations:

• Pipe from the gas supply line connection to the gas valve

• Burner connections • Field made joints / gas shutoff valve

• Pilot • Factory made joints

• Each joint or connection • All joints on valve and control body

LIGHTING PILOT - MILLIVOLT

1. Depress and turn knob counterclockwise
to pilot position.

2. Depress fully and hold pilot gas knob. Depress piezo
ignitor as many times as needed to ignite the pilot.
Keep knob fully depressed for a few seconds.
Release and check that pilot continues to burn.

If the pilot does not stay lit, repeat steps 1 and 2.

O

N

T

O

L

I

P

F

F

O

PILOT

Figure 54 - Pilot Position

Continued on next page

75D2523 39

OPERATING INSTRUCTIONS

LIGHTING BURNER - MILLIVOLT

MAIN BURNER SWITCH

The “ON/OFF/RS” switch for the main burner can be found behind door of the
fireplace. This switch allows you to turn on and to turn off the main burner without
using the gas valve knob. Make sure the button is in the “ON” position to light
the main burner. See Figure 55.

LIGHTING THE BURNER

Depress and turn the knob counterclockwise to the “ON” position. See
Figure 56. It will take less than four (4) seconds for the burner to ignite.

PILOT POSITION

Depress and turn knob to pilot position to keep burner off while maintaining the
pilot light. See Figure 57.

O

N

T

O

L

I

P

F

F

O

PILOT

ON

OFF

RS

Figure 55 -

On/Off/RS Switch

N

O

PILOT

Figure 56 - On Position

O

F

F

P

T

I

L

O

50

TO TURN OFF GAS - MILLIVOLT

Depress and turn knob clockwise

The control is fitted with a safety interlock device
which prevents unsafe ignition of the pilot burner after
the control knob has been turned to the OFF position.
The knob may only be rotated back to the PILOT
position after the safety magnet has been released
(approximately 60 seconds). You will hear a “click”

WARNING

when the safety magnet releases.

Figure 57 - Pilot Position

to “OFF” position. See Figure 58.

P

I

L

O

T

F

F

O

O

N

PILOT

Figure 58 - Off Position

Continued on next page

40 75D2523

OPERATING INSTRUCTIONS - ELECTRONIC IGNITION

FOR YOUR SAFETY READ BEFORE LIGHTING

A. This appliance is equipped with an ignition

device (Piezo) which automatically lights the
pilot. Do NOT try to light the burner by hand.

B. BEFORE OPERATING smell all around the

appliance area for gas. Be sure to smell next to
the floor because some gas is heavier than air
and will settle on the floor.

WHAT TO DO IF YOU SMELL GAS:

• Turn off all gas to the appliance.

• Open windows.

• Do not attempt to light any appliance.

• Do not touch any electric 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.

C. Turn off all electric power to appliance.

If you do not follow these instructions
exactly, a fire or explosion may result
causing property damage, personal
injury or loss of life.

WARNING

WARNING

Never use an open flame
to check for gas leak.

D. Do not use this appliance if any part of it has been under water. Immediately call a qualified service tech-

nician to inspect the appliance and to replace any part of the control system and any gas control that has
been under water.

LIGHTING ELECTRONIC IGNITION

1. STOP! Read the safety information above.

2. Set switch to “OFF”.

3. Turn off all electric power to the appliance.

4. This appliance is equipped with an ignition device which auto­matically lights the burner. Do not try to light the burner by
hand.

5. Wait 5 minutes to clear out any gas. Then smell for gas, includ­ing near the floor. If you smell gas STOP! Follow “B” — What
to Do if You Smell Gas above. If you do not smell gas, go to the next step.

6. Turn on all electric power to appliance.

7. Turn RS-OFF-ON rocker switch to “ON”.

8. If the appliance will not operate, follow the instruction To Turn Off Gas below and call your service techni-
cian or gas supplier.

Figure 59 - Electronic Gas Valve

LO

HI

ON

OFF

PILOT

TO TURN OFF GAS

1. Open lower door.

2. Turn RS-OFF_ON rocker switch to “OFF”.

3. Turn off all electric power to the appliance if service is to be performed.

4. Close lower door.

75D2523 41

CLEANING AND MAINTENANCE

Turn off gas before servicing fireplace. It is recommended
that a qualified service technician perform these check-ups
at the beginning of each heating season

WARNING

BURNER, PILOT AND CONTROL COMPARTMENT

Keep the control compartment, logs, and burner areas surrounding the logs clean
by vacuuming or brushing at least twice a year. Make sure the burner porting,
pilot air opening and burner air opening are free of obstructions at all times.

PILOT FLAME

The flames from the pilot should be visually checked as soon as the heater is
installed and periodically during normal operation. The pilot flame must always
be present when the fireplace is in operation. See Figure 60. The pilot flame
has three distinct flames, one engulfing the thermopile, one engulfing the ther­mocouple, and the other reaching to the main burner..

BURNER

Inspect area around the injector. Remove any lint or foreign material with a
brush or vacuum.

BURNER FLAME

Thermocouple

Thermopile

Figure 60 - Pilot Flame

The flames from the burner should be visually checked
as soon as the heater is installed and periodically during
normal operation. In normal operation, at full rate, and
after operating for about 15 to 30 minutes, the flame
should be yellow and slightly taller than the rear log. See

Figure 61.

If the flame is blue and only in the center, turn off unit
and let cool. After unit is cool, remove logs and check to
make sure rock wool is placed correctly. Replace logs.

NOTE: The type of installation, vent system
configuration, and wind effects may cause the
flame patterns to vary.

Figure 61 - Burner Flame Appearance

42 75D2523

CLEANING AND MAINTENANCE

VENT SYSTEM

The fireplace and venting system should be inspected before initial use and at least annually by a qualified field service
person. Inspect the external vent cap on a regular basis to make sure that no debris is interfering with the airflow. Inspect
entire venting system to ensure proper function.

GLASS DOOR

Thoroughly clean the inside of the glass door after using the fireplace for ten hours. Periodically clean the glass door as
necessary.

When cleaning the glass, remember:

• Do not remove the glass when hot. Allow glass to cool before removal.

• NEVER use abrasive materials.

• Keep children and pets a safe distance away.

• Never operate the fireplace without the glass door properly secured.

• Never operate the fireplace if the glass is broken.

• Replace any glass that is chipped, cracked, or broken. Replacement glass door assemblies MUST be supplied by the

fireplace manufacturer – No substitute materials may be used.

• Handle glass door with care to avoid striking or scratching it on hard objects.

To clean glass door, follow “Glass Removal” procedure outlined in the Canopy Installation and Glass Removal section.
Film deposit on the inside of the glass should be cleaned off using a nontoxic, non-corrosive, non-abrasive, mild cleaning
solution. Simply apply an adequate amount to the glass and wipe off with a damp cloth. After all maintenance has been
completed, re-install glass door.

LOGS

Leave logs installed in the fireplace for cleaning. Vacuum surface of the logs with a brush attachment. If logs must be
removed for cleaning, handle carefully by holding gently at each end. Gloves are recommended to prevent skin irritation
from ceramic fibers. If skin becomes irritated, wash gently with soap and water. Vacuum surface of logs with brush attach­ment or brush logs with a soft bristle brush (i.e. clean, dry paintbrush). To place logs back in the fireplace, see Log and Rock
Wool Installation section.

NOTE: Do not use cleaning fluid to clean logs.

ROCK WOOL

Replace or add rock wool as required following installation instructions in the Log and Rock Wool Installation section of
this manual.

75D2523 43

ILLUSTRATED PARTS LIST

VENT COMPONENTS FOR 4"X65/8"

1

4

7

8

3

HOT

5

9

10

2

6

Simpson

Qty/

Item

Box Description

1 1 Horizontal High Wind Termination Cap 985 4DT-HC
1 1 Horizontal Square Termination Cap with Built-In Vinyl Siding Standoff,

Heat Deflector and Firestop

1 1 Horizontal Rigid Pipe Termination Kit with Horizontal Termination Cap

with Built-In Vinyl Siding Standoff, Heat Deflector, Firestop, 90° Elbow
and 11"x145/8" Adjustable Pipe

1 1 Horizontal Flexible Pipe Termination Kit with Horizontal Termination

Cap with Built-In Vinyl Siding Standoff, Heat Deflector, Firestop, 20" to

40" Flexible Pipe Adapter
2 1 Vertical Termination 980 4DT-VC
3 6 6” Pipe Length 908 4DT-06
3 6 9” Pipe Length 907 4DT-09
3 6 12” Pipe Length 906 4DT-12
3 6 24” Pipe Length 904 4DT-24
3 6 36” Pipe Length 903 4DT-36
3 6 48” Pipe Length 902 4DT-48
4 6 11” To 14 5/8” Pipe, Adjustable 911 4DT-AJ
4 6 17” To 24” Pipe, Adjustable 917 4DT-AJ14
5 6 45° Elbow 945 4DT-EL45
5 6 45° Swivel Elbow 945G 4DT-EL45
6 6 90° Elbow 990 4DT-EL90
6 6 90° Swivel Elbow 990G 4DT-EL90
7 6 Flashing, 0/12 To 6/12 Roof Pitch 943 4DT-AF6
8 6 Storm Collar 953 4DT-SC
9 6 Firestop 963 4DT-FS

10 1 Vinyl Siding Standoff 950 4DT-VS

5

11 1 Reducer to 4"x6

/8" 1222DA

Duravent Selkirk

Monessen P/N

BHRTK

BHSTK

BHSFTK

11

44 75D2523

ILLUSTRATED PARTS LIST

VENT COMPONENTS FOR 5"X8"

1

3

4

7

8

9

HOT

2

Qty/

Item

Box Description

1 1 Horizontal High Wind Termination Cap 1285 5DT-HC
1 1 Horizontal Termination Cap with Built-In Vinyl Siding Standoff,

Heat Deflector, Firestop and Adjustable Pipe 7" to 11"

1 1 Horizontal Termination Cap Built-In Vinyl Siding Standoff, Heat

Deflector,
Firestop, 90° Elbow and Adjustable Pipe 7" to 11"

1 1 Horizontal Termination Cap with Built-In Vinyl Siding Standoff,

Heat Deflector,

Firestop and Flexible Pipe 24" to 48"
2 1 Vertical Termination 1280 5DT-VC
3 4 6” Pipe Length 1208 5DT-06
3 4 9” Pipe Length 1207 5DT-09
3 4 12” Pipe Length 1206 5DT-12
3 4 24” Pipe Length 1204 5DT-24
3 4 36” Pipe Length 1203 5DT-36
3 4 48” Pipe Length 1202 5DT-48
4 4 11” To 14 5/8” Pipe, Adjustable 1211 5DT-AJ
4 4 17” To 24” Pipe, Adjustable 1217 N/A
5 4 45° Elbow 1245 5DT-EL45
5 4 45° Swivel Elbow 1245G 5DT-EL45
6 4 90° Elbow 1290 5DT-EL90S
6 4 90° Swivel Elbow 1290G 5DT-EL90S
7 6 Flashing, 0/12 To 6/12 Roof Pitch 1243 5DT-AF6
8 6 Storm Collar 1253 5DT-SC
9 4 Firestop 1263 5DT-FS

10 1 Vinyl Siding Standoff 1250 5DT-VS

5

6

Simpson

Duravent Selkirk

Monessen P/N

BHR8TK

BHS8TK

BHSF8TK

10

For more information about, or instructions for, the venting components referenced above, please contact the component
manufaturer:

Selkirk Corporation: www. selkirkcorp.com or 800-992-8368
Simpson Duravent: www. duravent.com or 800-835-4429

75D2523 45

ILLUSTRATED PARTS LISTS

FIREBOX COMPONENTS

6

5

7

2

3

4

8

1

8

46 75D2523

10

9

ILLUSTRATED PARTS LISTS

FIREBOX COMPONENTS

Item Description Qty MDV500 MDV600

Standard Features

1 Junction Box Assembly 1 26D2128K 26D2128K
2 Top Louver Assembly 1 56D2140K 56D2259K
3 Bottom Louver Door Assembly 1 56D2141K 56D2260K
4 Glass Frame Assembly 1 56D2143K 56D2269K
5 Canopy 1 56D2056K 56D2213K
6 Insulation Board 1 56D2156K 56D2216K

Accessories/Field Installed Options

7 Cottage Clay Firebrick Walls 1 FBMDV500CC FBMDV600CC
7 Cottage Red Firebrick Walls 1 FBMDV500CR FBMDV600CR
8 Blower 2 56D2162K 56D2162K
9 Thermostat Sensor 1 26D2870K 26D2870K

10 Speed Control 1 26D0746K 26D0746K

8, 9, 10 T-stat Blower with Speed Control 1 BLOTSDV BLOTSDV

LOGS

Item Description Qty MDV500 MDV600

1 Log #1 1 72D2008 72D2008
2 Log #2 1 72D2009 72D2009
3 Log #3 1 72D2010 72D2010
4 Log #4 1 72D2011 72D2011
5 Log #5 1 72D2012 72D2012
6 Log #6 1 72D2013 72D2013
7 Log #7 1 72D2014 72D2014
8 Log #8 1 72D2015 72D2015

75D2523 47

ILLUSTRATED PARTS LISTS

ADDITIONAL ACCESSORIES

2

1

3

4

5

48 75D2523

ILLUSTRATED PARTS LISTS

ADDITIONAL ACCESSORIES/FIELD INSTALLED OPTIONS AVAILABLE

Item Description Qty MDV500 MDV600

1

Metal Trim - Brass

1

Metal Trim - Pewter

1

Metal Trim - Black

22Brass Louvers

Pewter Louvers
3 Screen Frame - Black 1 MDV500SD MDV600SD
4

Cabinet Door Frame - Black
4

Cabinet Door Frame - Iron Age
4

Cabinet Doors with Screen - Black
4

Cabinet Doors with Screen - Iron Age
55Arched Front with Lower Control Door - Black

Arched Front with Lower Control Door - Iron Age

1
1
1

6
6

1
1
1
1

1
1

BRMTK500

PWMTK500

BLMTK500

VSDVC500CDFB

VSDVC500CDFIA

VSDVC500CDB

VSDVC500CDIA

VSDVC500AFB

VSDVC500AFIA

L36BR

L36PW

BRMTK600

PWMTK600

BLMTK600

L42BR

L42PW

VSDVC600CDFB

VSDVC600CDFIA

VSDVC600CDB

VSDVC600CDIA

VSDVC600AFB

VSDVC600AFIA

75D2523 49

ILLUSTRATED PARTS LISTS

STANDING PILOT — MILLIVOLT CONTROL

1

3

2C

4

2I

2T

2

5

6

7

10

8

9

11,12, 13, 14, 15, 16

50 75D2523

ILLUSTRATED PARTS LISTS

STANDING PILOT – MILLIVOLT CONTROL

Item Description Qty MDV500NV MDV500PV MDV600NV MDV600PV

1 Gas Valve Assembly 1 37D0117 37D0118 37D0117 37D0118
2

Pilot Assembly

2C

Replacement Thermocouple

2I

Replacement Igniter and Wire

2T

Replacement Thermopile
3 Burner Tube 1 56D2175 56D2175 56D2175 56D2175
4 Flex Hose with Shutoff Valve 1 69D0030 69D0030 69D0030 69D0030
5 Rocker Switch 1 41D0048 41D0048 41D0048 41D0048
6 Piezo Igniter 1 14D0503 14D0503 14D0503 14D0503
7 Injector 1 57D1030 20H3144 56D0614 57D0680
8 Burner Assembly 1 75D2509 75D2509 75D2509 75D2509
9 Venturi 1 45D0600 45D0600 45D0600 45D0600

10 Wire Assembly 1 44D0500 44D0500 44D0500 44D0500
10 Wire Assembly 1 44D0501 44D0501 44D0501 44D0501

Accessories

11 Thermostatic Remote Control 1 RCST/RCT/

12 On/Off Remote Control 1 RCB/RCBE/

13 Full function remote control 1 RCSTEB/

14 Wall Switch 1 MVWS MVWS MVWS MVWS
15 Wired Thermostat Kit 1 WT WT WT WT

Conversion Kit (Not Shown)

500 Conversion NG to LPG

500 Conversion LPG to NG

600 Conversion NG to LP

600 Conversion LP to NG

1
1
1
1

WWTD/WWTA

RCMT/WMTD

1

SCK500CKP
1
1
1

37D0018
37D1067
37D1069
37D1068

RCSITE

—
—
—

37D0019
37D1067
37D1069
37D1068

RCST/RCT/

WWTD/WWTA

RCB/RCBE/

RCMT/WMTD

RCSTEB/

RCSITE

—

SCK500CKN

—
—

37D0018
37D1067
37D1069
37D1068

RCST/RCT/

WWTD/WWTA

RCB/RCBE/

RCMT/WMTD

RCSTEB/

RCSITE

—
—

SCK600CKP

—

37D0019
37D1067
37D1069
37D1068

RCST/RCT/

WWTD/WWTA

RCB/RCBE/

RCMT/WMTD

RCSTEB/

RCSITE

—
—
—

SCK600CKN

75D2523 51

ILLUSTRATED PARTS LISTS

ELECTRONIC IGNITION

1

LO

HI

3

2

5

4

6

8

7

10

11

9

#1 #2 #3 #4 #5 #6 7#

52 75D2523

ILLUSTRATED PARTS LISTS

ELECTRONIC IGNITION

Item Description Qty MDV500NE MDV500PE MDV600NE MDV600PE

1 Gas Valve Assembly 1 37D0016 37D0017 37D0016 37D0017
2 Pilot Assembly 1 37D0020 37D0021 37D0020 37D0021
3 Burner Tube 1 56D2175 56D2175 56D2175 56D2175
4 Flex Hose with Shutoff Valve 1 69D0030 69D0030 69D0030 69D0030
5 Rocker Switch 1 41D0048 41D0048 41D0048 41D0048
6 Injector 1 57D0103 20H3144 56D0614 57D0680
7 Burner Assembly 1 75D2508 75D2508 75D2508 75D2508
8 Venturi 1 45D0600 45D0600 45D0600 45D0600

9 Wire Assembly 1 54D2007 54D2007 54D2007 54D2007
10 Ignition Module 1 37D0325 37D0325 37D0325 37D0325
11 Transformer 1 022788 022788 022788 022788

Conversion Kit (Not Shown)

500 Conversion NG to LPG
500 Conversion LPG to NG

600 ConversionNG to LP
600 Conversion LP to NG

1

SCK500CKEPC
1
1
1

—
—
—

—

SCK500CKENC

—
—

—
—

SCK600CKEPC

—

—
—
—

SCK600CKENC

75D2523 53

TROUBLESHOOTING

GENERAL TROUBLESHOOTING

SYMPTOM POSSIBLE

ACTION

CAUSE

1. Glass Soots A. Flame impingement
on logs

A. Install log set per the instructions
Inspect the injector and air intake area. Make sure this area does not have any

blockage from debris and clean.

Check gas supply.

STANDING PILOT IGNITION

SYMPTOM POSSIBLE CAUSE ACTION

1. Spark ignitor
will not light
pilot after
repeated
triggering of
piezo.

2. Pilot will not
stay lit after
carefully fol­lowing light­ing instruc­tions.

3. Pilot burn­ing, valve
knob turned
to “ON”,
switch is
turned to
“ON” or
“RS”, but
burner will
not ignite.

4. Frequent
pilot outage
problem.

5. The pilot and
main burner
extinguish
while in
operation

A. Wire disconnected. A. Open door and check to make sure wire is connected to ignitor.

B. Defective ignitor. B. Check for spark at electrode and pilot. If no spark and electrode wire is prop-

erly connected, replace pilot assembly.

C. No gas or low gas pressure. C. Check remote/manual shut off valve from fireplace. Low pressure can be

caused by bent lines, restricted lines, low pressure line pressure. Consult with
plumber or gas supplier.

D. No Propane/LPG in tank D. Check Propane/LPG tank. Refill tank.

A. Defective thermocouple A. Check that thermocouple flame impinges on thermocouple. Clean and/or

adjust pilot for maximum flame impingement. Ensure that the thermocouple
connection at the gas valve is fully inserted and tight.

Disconnect the thermocouple from the valve, place one millivolt lead wire on

the tip of the thermocouple and the other meter lead wire on the thermocouple
copper lead. Start the pilot and hold the valve knob in. If the millivolt reading
is less than 15 mV, replace pilot assembly.

B. Defective valve B. If thermocouple is producing more than 15 mV, replace faulty valve.

A. Defective switch, wall switch,

remote control or wire

B. Pilot flame too small B. If pilot flame is not close enough to the thermopile, adjust pilot flame.

C. Defective or malfunctioning

thermopile

D. Defective valve D. Turn valve knob to “On” and switch to “ON.” Take a reading at the thermopile

A. Pilot flame may be too high or

too low, causing pilot safety to
drop out

A. Inner vent pipe leaking exhaust

gases back into system

B. Horizontal vent improperly

pitched

C. Improper vent cap installation C. Check for proper installation and freedom from debris or blockage

A. Check switch and wire for proper connection. Place jumper wires across ter-

minals of switch. If burner comes on, replace defective switch. If the switch is
OK, repeat the same procedure on remote control If burner comes on, replace
remote control.

Place jumper wire across wire at gas valves (terminals marked TH and TP/TH).

If burner comes on, wires are faulty or connections are bad. Replace wire.

C. Check thermopile wire connections to make sure all are tight and that the

thermopile is fully inserted into pilot assembly. Check thermopile with a mil­livolt meter. Connect leads to TP and TP/TH terminals on the control valve.
If meter reading is below 325 mV, replace pilot assembly.

leads (TP & TP/TH) on the valve. If the meter reads greater than 175 mV and
the burner does not light, replace defective valve

A. Clean and adjust the pilot flame for maximum flame impingement on ther-

mocouple.

A. Check for flue product leak. Replace defective pipe section.

B. Check horizontal-venting piping is running upward 1/4" per foot. Do not

run the pipe level or downward.

54 75D2523

ELECTRONIC IGNITION

START

TROUBLESHOOTING

1. Turn gas supply off.

2. Turn ON/OFF switch to “ON”
Power to module (24V Normal)

YES

Is there a spark across

ignitor sensor gap?

YES

Turn on gas.

Does pilot burner light?

YES

NO

NO

NO

Check: Line voltage (120VAC)
Low voltage transformer (19.5 minimum VAC)
ON/OFF switch
Wiring connections

Unplug ignition lead and
check spark at module
(24VAC normal).

Is spark OK? NO Replace module

YES

A. Check ignition cable ground wiring, ceramic insulator and gap.

Correct if necessary.

B. Does ignition cable show signs of melting or buckling?

Take protective action to shield cable and boot from
excessive temperatures.

A. Are all manual gas valves open?
Are supply tubing and pressure good?
Are pilot burner orifices blocked?
B. Check electrical connections between module and pilot

operator on gas control.
C. Check for 24VAC across PV-MVPV terminals.
If voltage is correct, replace gas control.

If voltage is not correct, replace module.

Does spark stop when pilot is lit?

YES

Does main burner light?

YES

Does system run until ON/OFF switch

is in “OFF” position?

YES

END OF TROUBLESHOOTING

NO

NO

NO

NOTE: If module goes into lockout, reset system.

A. Check continuity of ignition cable and ground wire.
B. Clean flame rod.
C. Check electrical connections between flame rod and module.
D. Is ceramic flame rod insulator cracked?
E. Is pilot flame a steady blue? Does flame cover flame rod?
If not, adjust pilot flame. Replace module if problem persists.

A. Check for 24VAC across MV-MVPV terminal.
Replace module if there is no voltage.
B. Are electrical connections between module and gas

control good?

If connections are good, replace gas control or gas

control operator.

NOTE: If module goes into lockout, reset system.

A. Check continuity of ignition cable and ground wire.

NOTE: If ground is poor or erratic, shutdown may

occasionally occur even though operation is normal at

time of checkout.

B. Is pilot flame a steady blue? Does flame cover flame rod?

If above checks out, replace module.

75D2523 55

MASSACHUSETTS RESIDENTS ONLY:

PLEASE READ AND FOLLOW THESE

SPECIAL REQUIREMENTS

NOTE REGARDING VENTED PRODUCTS

This product must be installed by a licensed plumber or gas fi tter when installed within the Commonwealth of Massachu-
setts.

Any residence with a direct vent product must have a CO detector installed in the residence.
Installation of the fi replace or vented gas log in the State of Massachusetts requires the damper to be permanently removed

or welded in the fully open position.
In addition, a naturally vented gas log may not be installed in a bedroom or bathroom in the State of Massachusetts.
Flex line installation must not exceed 36 inches and must have a T shutoff valve.

NOTE REGARDING VENT FREE PRODUCTS

This product must be installed by a licensed plumber or gas fi tter when installed within the Commonwealth of Massachu-
setts.

In addition, vent free products may not be installed in a bedroom or bathroom regardless of size or type in the State of Mas­sachusetts.

Flex line installation must not exceed 36 inches and must have a T shutoff valve.

CARBON MONOXIDE DETECTOR REQUIREMENTS

(2) Revise 10.8.3 by adding the following additional requirements:
(a) For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in

whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side
wall exhaust vent termination is less than seven (7) feet above fi nished grade in the area of the venting, including but
not limited to decks and porches, the following requirements shall be satisfi ed:

1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of the side wall horizontal
vented gas fueled equipment, the installing plumber or gasfi tter shall observe that a hard wired carbon monoxide
detector with an alarm and battery back-up is installed on the fl oor level where the gas equipment is to be installed.
In addition, the installing plumber or gasfi tter shall observe that a battery operated or hard wired carbon monoxide
detector with an alarm is installed on each additional level of the dwelling, building or structure served by the side
wall horizontal vented gas fueled equipment. It shall be the responsibility of the property owner to secure the services
of qualifi ed licensed professionals for the installation of hard wired carbon monoxide detectors

a. In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic,

the hard wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent
fl oor level.

b. In the event that the requirements of this subdivision can not be met at the time of completion of installation,

the owner shall have a period of thirty (30) days to comply with the above requirements; provided, however,
that during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm shall be in­stalled.

56 75D2523

MASSACHUSETTS RESIDENTS ONLY

2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance
with the above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certifi ed.

3. SIGNAGE. A metal or plastic identifi cation plate shall be permanently mounted to the exterior of the building at
a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally
vented gas fueled heating appliance or equipment. The sign shall read, in print size no less than one-half (1/2) inch
in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.”

4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not
approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage
installed in accordance with the provisions of 248 CMR 5.08(2)(a)1 through 4.

(b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:

1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be V ented” in the most current edition of
NFPA 54 as adopted by the Board; and

2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from
the dwelling, building or structure used in whole or in part for residential purposes.

(c) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED. When the manufacturer

of Product Approved side wall horizontally vented gas equipment provides a venting system design or venting system
components with the equipment, the instructions provided by the manufacturer for installation of the equipment and the
venting system shall include:

1. Detailed instructions for the installation of the venting system design or the venting system components; and

2. A complete parts list for the venting system design or venting system.

(d) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED. When the

manufacturer of a Product Approved side wall horizontally vented gas fueled equipment does not provide the parts
for venting the fl ue gases, but identifi es “special venting systems,” the following requirements shall be satisfi ed by the
manufacturer:

1. The identifi cation of each “special venting system” shall include either the listing of the website, phone number or
manufacturer’s address where the venting system installation instructions can be obtained; and

2. The “special venting systems” shall be Product Approved by the Board, and the instructions provided with that
system shall include a parts list and detailed installation instructions.

(e) A copy of all installation instructions for the Product Approved side wall horizontally vented gas fueled equipment and

all the venting instructions, parts lists, and/or all design instructions for the venting system shall remain with the appli­ance or equipment at the completion of the installation.

75D2523 57

NOTES

58 75D2523

NOTES

75D2523 59

LIMITED LIFETIME WARRANTY POLICY

LIFETIME WARRANTY

The following components are warranted for life to the original owner, subject to proof of purchase: Firebox, Combustion
Chamber, Heat Exchanger, Grate and Stainless Steel Burners.

FIVE YEAR WARRANTY

The following components are warranted five (5) years to the original owner, subject of proof of purchase: Ceramic Fiber
Logs.

BASIC WARRANTY

Monessen Hearth Systems (MHS) warrants the components and materials in your gas appliance to be free from manufac­turing and material defects for a period of two years from date of installation. After installation, if any of the components
manufactured by MHS in the appliance are found to be defective in materials or workmanship, (MHS) will, at its option,
replace or repair the defective components at no charge to the original owner. MHS will also pay for reasonable labor costs
incurred in replacing or repairing such components for a period of two years from date of installation. Any products presented
for warranty repair must be accompanied by a dated proof of purchase.

This Limited Lifetime Warranty will be void if the appliance in not installed by a qualified installer in accordance with the
installation instructions. The Limited Lifetime Warranty will also be void if the appliance is not operated and maintained
according to the operating instructions supplied with the appliance, and does not extend to (1) firebox/burner assembly
damage by accident, neglect, misuse, abuse, alterations, negligence of others, including the installation thereof by unquali­fied installers, (2) the costs of removal, reinstallation or transportation of defective parts on the appliance, or (3) incidental
or consequential damage. All service work must be performed by an authorized service representative.

This warranty is expressly in lieu of other warranties, express or implied, including the warranty of merchantability of fitness
for purpose and of all other obligations or liabilities. MHS does not assume for it any other obligations or liabilities in con­nection with sale or use of the appliance. It states that do not allow limitations on how long an implied warranty lasts, or do
not allow exclusion of indirect damage, those limitations of exclusions may not apply to you. You may also have additional
rights not covered in the Limited Lifetime Warranty.

MHS reserves the right to investigate any and all the claims against the Limited Lifetime Warranty and decide upon method
of settlement.

For information about this warranty, contact:

Technical Services

Monessen Hearth Systems

149 Cleveland Drive

Paris, Kentucky 40361

877-406-9180

APRIL 2008 P/N 75D2523 • Rev. 2