Vanguard MDVFST Owner's Operation And Installation Manual

®

DIRECT-VENT GAS FIREPLACE

OWNER’S OPERATION AND INSTALLATION MANUAL

This fireplace meets
the construction and

safety standards of

H.U.D. for application

in mobile homes when

installed according to

these instructions.

This appliance is

shipped ready for natural

gas installation. The

propane/LP conversion

parts are included.

MDVFST (See Thru) fireplace with manual variable blower, ON/OFF hand-held remote control,

electrical junction box, gas flex line and equipment shutoff valve.

WARNING: If the information in these instruc­tions is 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.

SAVE THIS BOOK

This book is valuable. In addition to instructing
you on how to install and maintain your appli­ance, it also contains information that will
enable you to obtain replacement parts or
optional accessory items when needed. Keep
it with your other important papers.

WARNING: Improper installation,
adjustment, alteration, service, or
maintenance to this appliance 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.

WARNING: This direct-vent gas fire­place series is intended for use with
Natural or Propane/LP gas only. Do
not attempt to burn any solid fuels
in these appliances.

CHECK LOCAL CODES PRIOR TO INSTALLATION

This appliance may be installed as an OEM installation in a manufactured (mobile) home and must
be installed in accordance with the manufacturer's instructions and the Manufactured Home
Construction and Safety Standard,
Standard,

This appliance is only for use with the type of gas indicated on the rating plate. A conversion kit is
supplied with the appliance.

CAN/CSA Z240 MH

Save this manual for future reference.

Title 24 CFR, Part 3280

Series, in Canada.

in the United States or the Mobile Home

®

MDVFST DIRECT-VENT GAS FIREPLACE

Left Side
Surround

Back of
Surround

(Back)

Right Side
Surround

23 5/

(60cm)

1

8

11
(30cm)

1

/4 (3cm)

TOP VIEW

(Left Side)

10 1/

(27cm)

2

ø1.5

(4cm)

(Right Side)

RIGHT SIDE

15

/

16

Alternate Gas
Supply Inlets

(Front)

ø1.5

(4cm)

1

/

8

11

(28cm)

39 3/

(101cm)

4

26

(67cm)

3 (8cm)

3

/

8

Rating Plate

22 5/

(57cm)

8

32 (81cm) (Opening)

1

43

/8 (110cm)

Location

7

/8 (5cm)

1

Figure 1 - MDVFST (See Thru) Dimensions

Note:

All dimensions in this manual are in inches unless otherwise specified.

GLOSSARY OF
TERMS

fireplace includes a manual variable blower,
electrical junction box, flexible gas line,
equipment shutoff valve, and an ON/OFF
hand-held remote control. Model MDVFST

Chase - A boxlike enclosure to protect

venting from the elements when the venting
run is on the outside of a structure.

Mastic - A pliable sealant for use around the

vent terminal.

Snorkel Termination - A box that raises the

horizontal termination above ground level
clearances.

Vent Terminal - Mounted on an outside

wall or roof to separate the inlet and outlet of
the vent system and protect it from weather.

Vinyl Siding Standoff - A metal box that

separates the vent cap from vinyl siding.

Wall Thimble/Firestop - A metal plate used

to secure the vent pipe when it passes through
a wall or ceiling.

INTRODUCTION

is convertible with the fireplace factory setup
as natural gas. For details on conversion, see
pages 21 and 22.

NOTICE: Check local building
codes for area requirements be­fore installing this appliance.

If you have any doubts as to which gas your
particular appliance is approved and tested
for, please check the CSA/AGA/CGA rat­ing plate located at the interior of the appli­ance opening or consult your local distribu­tor (see Figure 1).

BEFORE YOU BEGIN

Before beginning the installation of this
appliance, read these instructions through
completely.

This DESA appliance and its approved com-

Model MDVFST is a two-sided direct-vent gas
fireplace with a sealed combustion chamber.

Model MDVFST is specifically designed
for use in manufactured (mobile) homes.
This appliance uses a millivolt gas control
valve and a millivolt ignition system. The

ponents are safe when installed according to
this installation manual and operated as
recommended by DESA. Unless you use
DESA approved components tested for this
appliance, YOU MAY CAUSE A SAFETY

HAZARD!

BACK VIEW

1 (3cm)

FRONT VIEW

5

23

/8 (60cm)

25 (64cm)

5

22

/

(57cm)

3 (8cm)

2 (5cm)

30

(76cm)

(Opening)

34

(88cm)

8

The DESA warranty will be voided by, and
DESA disclaims any responsibility for the
following actions:

A) Modification of the appliance or any

3

/

4

of the components manufactured by
DESA unless otherwise permitted in
writing by DESA.

B) The use of any components part not ap-

proved by DESA in combination with
this DESA appliance.

C) Installation and/or operation in a man-

ner other than instructed in this manual.

D) The burning of anything other than the

type of gas approved for use in this gas
appliance.

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, ANS/NFPA 70 or
the Canadian Electrical Code, CSA C22.1.

The installation must conform with local codes
or, in the absence of local codes, with the

National Fuel Gas Code, ANS Z223.1 or the
Canadian Installation Code, CAN/CGA B149.

This appliance complies with ANS Z21.50­1998/CSA 2.22-M48 as a VENTED GAS

FIREPLACE. It is listed and tested by CSA.

NOTICE: This appliance is in­tended to be used only for supple­mental heat.

WARNING: Installation and
repair must be done by a quali­fied installer/service person. The
appliance should be inspected
before use, and at least annually
thereafter by a qualified service
person. More frequent cleaning
may be required due to exces­sive lint from carpeting, bedding,
material, pet hair, etc. It is im­perative that the control compart­ments, burners, and circulating
air systems be kept clean.

2

106442

SELECTING
LOCATION

To determine the safest and most efficient
location for your appliance, consider the
following guidelines:

1. The location must allow for proper
clearances (see Clearances).

2. Consider a location where heat output
would not be affected by drafts, air con­ditioning ducts, windows, or doors.

3. A location that avoids the cutting of joists
or roof rafters makes installation easier.

In selecting a location, the following pre­cautions must be observed:

1. A projection may be ideal for a new ad­dition on an existing finished wall. See
Horizontal T ermination Configuration,
page 9, or Vertical Ter mination Con-
figuration, pages 10 through 12.

2. Do not locate appliance close to where
gasoline or other flammable liquids may
be stored. The appliance must be kept clear
and free from combustible materials.

3. Do not connect this appliance to a
chimney system used for solid fuel
burning fireplace.

4. Due to high temperatures, do not lo­cate this appliance in high traffic areas
or near furniture and draperies.

5. This fireplace may be installed in bed­rooms or bathrooms in accordance with
local codes.

6. Never obstruct the openings of the ap­pliance or flow of ventilation air. Keep
the control compartments accessible.

7. Do not use this appliance if any part
has been under water. Immediately
contact a local service technician to ex­amine the appliance and to replace any
part(s) of the control ignition system
and other related components that have
submerged under water.

OWNER’S MANUAL

Figure 2 - Possible Installation of See­Thru Fireplace

PRE-INSTALLATION PREPARATION

CLEARANCES

Minimum clearances to combustibles are:

• Back and Sides of Fireplace:................................. 0" min.

• Vent Surfaces: .......................................... 1" (2.5cm) min.

• Ceiling to Top of Opening: .....................36" (91cm) min.

• Floor: ..................................................................... 0" min.

• Wall to Front of Glass: ............................ 36" (91cm) min.

• Perpendicular Wall to Opening of Unit:......2" (5cm) min.

• Top Spacer: ........................................................... 0" min.

CEILING

36"

(914mm)

Min.

WALL

36"

(914mm)

Min.

Figure 3 - Minimum Clearances

Left Side
Surround
(0" Min.)

Combustible
Material

Right Side
Surround
(0" Min.)

Perpendicular
Wall 2" (51mm)
Min. From Opening

Figure 4 - Minimum Clearances

Top Spacers

TOP VIEW

2" (51mm)

Wall In Front Of Glass

36" (91cm) Min.

0" Floor

CAUTION: Do not block re­quired air spaces with insula­tion or any other material. Do not
obstruct the effective opening of
the appliance with any type of
facing material.

0"

Drywall

2 x 4 Stud

Minimum 1"
Clearance from
Side

36"

(914mm)

Continued

106442

3

®

MDVFST DIRECT-VENT GAS FIREPLACE

PRE-INSTALLATION
PREPARATION

Continued

MANTEL CLEARANCES

Woodwork, such as wood trims, mantels,
and other combustible materials projecting
no more than 1 1/2 inches (3.8cm) shall not
be placed within 7 inches (17.8cm) from the
opening of the unit. Combustible material
above and projecting more than 1 1/2 inches
(3.8cm) from the appliance’s face must not
be placed less than 15 inches (38.1cm) from
the louver opening (see Figure 5).

Combustible
Material May
Be Used

21"

(533mm)

Min.

(381mm)

(102mm)

15"

Min.

Top of Louver
Opening

Figure 5 - Mantel Clearances

FRAMING

Once the final location has been determined,
observing height clearances for vent termi­nation, you may construct framing using
dimensions shown in Figure 6, depending
on your installation.

If the appliance is to be installed directly on
carpeting, tile (other than ceramic), or any
combustible material other than wood floor­ing, the appliance must be installed on a
metal or wood panel extending the full width
and depth of the appliance. There are three
holes on each side of the bottom of the unit
where screws can be used to secure the unit
to the floor.

Drywall (Gypsum
Board, Sheetrock, Etc.)

12"

(305mm)

Min.

4"

Min.

7" (178mm)
Min.

Safe Zone for
Projection of
Combustible
Material

2 x 4

Spacer

1

/2" (38mm)

1
Min.

UNIT

"

8

/

5

23

(600mm)

39 3/4"

(1010mm)

Min.

43

1

(1098mm)

/4"

Figure 6 - Rough Opening for Installing
See Thru Fireplace

1" (25mm)

Dia. Hole

1"

(25mm)

3"

2" (51mm)

Dia. Hole

2"

(51mm)

3" (76mm)

(76mm)

Figure 7 - Hole Locations For Gas Line
and Electric Wires

10"

(254mm)

Square Min.

Height

Depends On

Installation

Figure 8 - Rough Opening for Installing
Exterior Vent Terminal

Refer to Pages
9 through 12
for Horizontal
and Vertical

Vertical Height

Depends on

Installation

o

90

Elbow

o

45

Elbow

3

26

/8"

(670mm)

Horizontal

Length Depends

on Installation

Installation
Details

Figure 9 - Vent Opening Height

GENERAL VENTING

Note:

Terminations are not designed for

installation prior to transportation.

These models are approved for use with both
flex and rigid Vanguard vent components as
well as Simpson Dura-Vent 6 5/8" direct-vent
pipe components and terminations.

Your fireplace is approved to be vented either
through the side wall, or vertically using the
following guidelines:

• Only use Vanguard or Simpson Dura­V ent GS venting components or kits spe­cifically approved for this fireplace.

• Minimum clearance between vent pipes
and combustible materials is 1" (25 mm),
except where stated otherwise.

• Combustible material may be flush with
the top front of fireplace with a maxi­mum thickness of 3/4".

• Do not recess venting terminals into a
wall or siding.

• Install horizontal venting with a 1/4" rise for
every 12" of run toward the termination.

• You may paint the vent terminal with
450°F (232°C) heat-resistant paint to co­ordinate with the exterior finish.

• There must not be any obstruction such
as bushes, garden sheds, fences, decks,
or utility buildings within 24" from the
front of the termination cap.

• Do not locate termination cap where exces­sive snow or ice build up may occur. Be sure
to clear vent termination area after snow falls
to prevent accidental blockage of venting
system. When using snow blowers, do not
direct snow towards vent termination area.

4

106442

OWNER’S MANUAL

GENERAL VENTING

Continued

LOCATION OF VENT TERMINATION

When locating vent termination, it is important to observe the minimum clearances shown in Figure 10. You will avoid extra framing by positioning
your fireplace against an already existing framing member. The sides of the fireplace may be positioned directly against combustible walls.

*Check with local codes or with the current CAN/CGA B149 [.1 or .2] Installation Codes for Canada or the USA Installations follow the
current National Fuel Gas Code, ANS Z223.1, also known as NFPA 54.

N

G

V

G

V

X

K

A

D

E

V

B

L

V

A = clearance above grade, veranda, porch, deck, or balcony

[*12 inches (305mm) minimum]

B = clearance to window or door that may be opened

[12 inches (305mm) minimum]

C = clearance to permanently closed window [minimum 12 inches

(305mm) recommended to prevent condensation on window]

D = vertical clearance to ventilated soffit located above the terminal

within a horizontal distance of 24 inches (610mm) from the

center-line of the terminal [18 inches (457mm) minimum]
E = clearance to unventilated soffit [12 inches (305mm) minimum]
F = clearance to outside corner (see below)
G = clearance to inside corner (see below)
H = *not to be installed above a meter/regulator assembly within

36 inches (914mm) horizontally from the center-line of the regulator

† vent shall not terminate directly above a side-walk or paved driveway which is located between two

single family dwellings and serves both dwellings*
‡ only permitted if veranda, porch, deck or balconey is fully open on a minimum of 2 sides beneath the floor*
* as specified in CAN/SGA B149 (.1 or .2) Installation Codes (1991) for Canada or for U.S.A. installation follow

the current
Note: Local codes or regulations may require different clearances

C

Fixed

Closed

F

TERMINATION CAP

Openable

V

B

National Fuel Gas Code, ANS Z223.1

V

Openable

B

AIR SUPPLY INLET

X

B

V

B

J

X

I = clearance to service regulator vent outlet [*72 inches (1829mm)

minimum]

J = clearance to non-mechanical air supply inlet to building or the

combustion air inlet to any other fireplace [*12 inches (305mm)
minimum]

K = clearance to a mechanical air supply inlet [*72 inches (1829mm)

minimum]

L = † clearance above paved side-walk or a paved driveway located on

public property [*84 inches (2133mm) minimum]
M = clearance under veranda, porch, deck [*12 inches (305mm) minimum ‡]
N = clearance above a roof shall extend a minimum of 24 inches (610mm)

above the highest point when it passes through the roof surface and

any other obstruction within a horizontal distance of 18 inches (457mm)

V
A

Fixed

Closed

H

G

GAS METER RESTRICTED AREA

Termination Clearances for Buildings with Combustible and Noncombustible Exteriors

Inside Corner

Outside Corner Recessed Location

N

I

G

M

V

(TERMINATION PROHIBITED)

A

Balcony with No Side Wall

G = Combustible 24" (610mm)

Noncombustible 18" (457mm)

V

G

V

A = 6" (152mm)

Balcony with Perpendicular Side Wall

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

Figure 10 - Minimum Clearances for Vent Terminations

106442

D

C

V

B = 6" (152mm)

B

H

V

J

C = Maximum depth of 48" (1219mm) for

recessed location

D = Minimum width for back wall of

recessed location ­Combustible - 38" (965mm)
Noncombustible - 24" (610mm)

E = Clearance from corner in

recessed location­Combustible - 6" (152mm)
Noncombustible - 2" (51mm)

C

E

V

5

®

MDVFST DIRECT-VENT GAS FIREPLACE

VENTING
INSTALLATION

WARNING: Read all instruc­tions completely and thoroughly
before attempting installation. Fail­ure to do so could result in serious
injury, property damage or loss of
life. Operation of improperly in­stalled and maintained venting sys­tem could result in serious injury,
property damage or loss of life.

WARNING: Seal all vent connec­tions. Seal only the outer pipe con­nections high temperature silicone
(600°F/316° C). Before joining elbows
and pipes, apply a bead of high
temperature silicone sealant (GE
RTV 106/Loctite RTV 81585) to the
male end of the elbow or pipe. High
temperature silicone must also be
used to reseal any connections after
maintenance to venting system.

NOTICE: Failure to follow these
instructions will void the warranty.

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 or service person
should install venting system. The installer
must follow these safety rules:

• Wear gloves and safety glasses for
protection

• Use extreme caution when using ladders
or when on roof tops

• 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 DESA
International

• Installation other than as instructed by
these instructions

WARNING: This gas fireplace
and vent assembly must be
vented directly 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 clearance of 2" from the top of
the vent pipe and 1" minimum to the
sides and bottom. Vertical sections
of this system require a minimum of
1" clearance to combustible materi­als on all sides of the vent pipe.

INSTALLATION PLANNING

There are two basic types of direct-vent
installation:

• Horizontal Termination

• V ertical 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. The horizon­tal run of venting must have 1/4" rise for
every 12" of run towards the termination.

A MDVGFK ground floor horizontal vent
kit is specifically designed for common
horizontal installations in manufactured
(mobile) homes. Additional horizontal in­stallations are described on page 9. All vent
kits and components are listed on page 13.

WARNING: Never run the vent
downward as this may cause ex­cessive temperatures which
could cause a fire.

You may use one or two 90° elbows in a
horizontal vent configuration. See Horizon-
tal Termination Configurations on page 9.

For Vertical Termination: Measure the dis-

tance from the fireplace flue outlet to the
ceiling. Add the ceiling thickness, the verti­cal rise in an attic or second story, and allow
for sufficient vent height above the roofline.
You may use one or two 90° elbows in a

vertical vent configuration. See Vertical Ter-
mination Configurations on pages 11 and 12.

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 MDV9K 9' vertical vent kit is specifi­cally designed for common vertical installa­tions in manufactured (mobile) homes. Ad­ditional vertical installations are described
on pages 11 and 12. All vent kits and com­ponents are listed on page 13.

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.

Your Vanguard direct-vent fireplace has
been tested for a minimum 3' rise with a
maximum 10" wall thickness. The maxi­mum horizontal run is 20' with 8' vertical
rise (see Installation for Horizontal Termi-
nation, pages 7 through 9). The maximum
vertical run is 40' (see Installation for Ver-
tical Termination, page 10 through 12).

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 Vent System in a Chase

A chase is a vertical boxlike structure built
to enclose venting that runs along the out­side of a building. A chase is not required for
such venting.

NOTICE: 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.

Note:

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. Minimum clear­ance between vent pipes and combustible
materials such as insulation is 1".

After framing the chase (see Framing on
page 4) install the vent system by following
the installation instructions.

6

106442

VENTING
INSTALLATION

Continued

INSTALLATION FOR
HORIZONTAL TERMINATION

1. Determine the route your horizontal
venting will take.
of the horizontal vent termination on
the exterior wall must meet all local and
national building codes and must not
be easily blocked or obstructed.

Note:

The location

OWNER’S MANUAL

12" Minimum

90°

1' Minimum

WARNING: Do not recess vent

terminal into a wall or siding.

Snorkel terminations are available for
terminations requiring a vertical rise on
the exterior of the building (see Figures
11 and 12). Snorkel kit SVK is also
available (see page 13). Follow the
same installation procedures used for
standard horizontal terminations. If in­stalling the snorkel termination below
grade (basement applications), you must
provide proper drainage to prevent wa­ter from entering the snorkel termina­tion (see Figure 12). Do not back fill
around the snorkel termination.

2. Rigid vent pipes and fittings have spe­cial twist-lock connections. Assemble
the desired combination of pipe and el­bows to the appliance adaptor with pipe
seams oriented towards the wall or floor.

Twist-lock Procedure: The female
ends of the pipes and fittings have four
locking lugs (indentations). These lugs
will slide straight into matching slots on
the male ends of adjacent pipes and fit­tings. (All connections must be sealed
with high temperature silicone sealant
as specified in the second warning state­ment on page 6.) Push the pipe sections
together and twist one section clockwise
approximately one-quarter turn until the
sections are fully locked. See Figure 13,
page 8.
must be supported every three feet. Use
wall straps for this purpose.

Flexible vent pipe must be installed with
spacer springs every 12". See Figure 13,
page 8. All connections must be clamped
tightly and sealed with high temperature
silicone sealant as specified in the sec­ond warning statement on page 6.

Note:

Horizontal runs of vent

Snorkel

45°

Figure 11 - Snorkel Termination

90°

1' Minimum

45°

Figure 12 - Snorkel Termination with Drainage Pipe

Snorkel

12" Minimum

Adequate
Drainage

Continued

106442

7

®

MDVFST DIRECT-VENT GAS FIREPLACE

VENTING
INSTALLATION

Continued

3. Attach vent pipe assembly to the fire­place. Set fireplace in front of it’s per ­manent location to insure minimum
clearances. Mark the wall for a 10"
square hole (for noncombustible ma­terial such as masonry block or con­crete, a 7 1/2" diameter hole is accept­able). See Figure 14. The center of the
hole should line up with the center­line of the horizontal rigid vent pipe.
Cut a 10"x10" (254mm x 254mm)
square hole through combustible ex­terior wall (7 1/2" [190mm] diameter
hole if noncombustible). Frame as nec­essary (see Figure 14).

4" Clamp

Female
Locking
Lugs

Male
Slots

7" Clamp

Spacer
Spring

4" Flex
Pipe

7" Flex
Pipe

4. Apply a bead of non-hardening mastic
around the outside edge of the vent cap.
Position the vent cap in the center of
the 7 1/2" or 10" hole on the exterior
wall with the arrow on the vent cap
pointing up. Insure proper clearance of
1" to combustibles is maintained. At­tach the vent cap with four wood screws
supplied (see Figure 15).

Note

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

WARNING: Do not recess vent
termination in to any wall. This
will cause a fire hazard.

For vinyl or stucco siding use vinyl sid­ing standoffs between vent cap and ex­terior wall. The vinyl siding standoff pre­vents excessive heat from melting the
vinyl siding material. Bolt the vent cap
to the standoff. 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 16.

5. Slide the wall thimble over the vent
pipe before connecting the horizontal
run to the vent cap (see Figure 17).

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 1/4". Apply silicone to
the outer pipe connection. Fasten all
vent connections with screws provided.
Refer to Fr aming on page 4 for instruc­tions on securing unit to framing or floor.

7. Slide the wall thimble against the inte­rior wall surface and attach with screws
provided (see Figure 17).

Cut Wood or Vinyl
Siding Away to Fit
Standoff

Wood Screw

Standoff

UP

Nut

Apply Mastic
to All Four Sides

Figure 16 - Installing Vinyl Siding Standoff

Vent Cap

Bolt

Rigid Vent Pipe Flexible Vent Pipe

Figure 13 - Vent Pipe Connections

Vent Opening

Combustible Wall

10"

(254mm)

10"

(254mm)

(Framing

Vent Opening

Noncombustible Wall

7 1/2"

(190mm)

Figure 14 - Vent Opening Requirements

Detail)

Apply Mastic
to All Four
Sides

UP

Wood
Screw

Vent Cap

Figure 15 - Installing Horizontal Vent Cap

8

Interior Wall
Surface

Wall
Thimble

Vent Cap
(Horizontal
Termination)

Figure 17 - Connecting Vent Cap with
Horizontal Vent Pipe

Screw

Horizontal
Vent Pipe

106442

OWNER’S MANUAL

UP

VENTING
INSTALLATION

Continued

Horizontal Termination
Configurations

Figures 18 through 20 show different con­figurations for venting with horizontal termi­nation. Each figure includes a chart with
vertical minimum/maximum and horizontal
maximum dimensions which must be met.
All connections must be sealed with high
temperature silicone sealant (outer pipe only)
as specified in the second warning statement
on page 6. All horizontal terminations re­quire 1/4" rise per 12" of horizontal run.

Vinyl
Standoff

(MDVGFK Kit Shown)

Horizontal Venting

Vertical (V) Horizontal (H)

49.5" min. 15" max.

45° Starter
Elbow

(45° elbow, 1' vertical pipe, 90° elbow)

61.5" min. 34" max.

73.5" min. 58" max.

85.5" min. 10' max.

102.5" min. 20' max.

Figure 18 - Horizontal Termination Configuration for Rigid Venting Using One 90° Elbow

Note:

The 30° Starter
Elbow Must Be
Discarded and
Replaced with a 45°
Starter Elbow D2060
Purchased Separately.

Horizontal Venting

See information in
Figure 18 for
Vertical(V) and

UP

Horizontal(H) maxi­mums and minimums.
The same amounts
apply for flexible
venting.

Note:

If your installation
has wood or vinyl
siding, you must install
the wood/vinyl siding
standoff D5000

Figure 19 - Horizontal Termination Using Flexible Venting

FGFVK Vent Kit Shown

Venting with Two 90° Elbows

Vertical (V) Horizontal (H1) +

Horizontal (H2)

5' min. 4' max.
6' min. 8' max.
7' min. 10' max.

Note:

8' min. 15' max.

20' max. 20' max.

If your installation
has wood or vinyl
siding, you must install
the wood/vinyl siding
standoff D5000

45° Starter
Elbow

Figure 20 - Horizontal Termination Configuration for Rigid Venting Using Two 90° Elbows with Termination at 90° with Fireplace

106442

Continued

9

®

MDVFST DIRECT-VENT GAS FIREPLACE

VENTING
INSTALLATION

Continued

INSTALLATION FOR
VERTICAL TERMINATION

NOTICE: Use rigid pipe only. Flex
venting is NOT to be used with a
vertical termination.

1. Determine the route your vertical vent­ing will take. If ceiling joists, roof rafters,
or other framing will obstruct the vent­ing system, consider an offset (see Fig­ure 21) to avoid cutting loadbearing
members.
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 10 on page 5.

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

Drop a plumb line from the inside of
the roof to the locating hole in the ceil­ing. Mark the center point where the
vent will penetrate the roof. Drill a
small locating hole at this point.

Wall Strap

Figure 21 - Offset with Wall Strap and 45

Note:

Pay special attention to

45° Elbow

Ceiling Firestop

Roof
Flashing

Flat Ceiling Installation

1. Cut a 10" square hole in the ceiling us­ing the locating hole as a center point.
The opening should be framed to
10"x10" (254mm x 254mm) inside di­mensions, as shown in Figure 14 on
page 8 using framing lumber the same
size as the ceiling joists. 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. Otherwise, install firestop below
the framed hole. The firestop should be
installed with a minimum of three nails
per side (see Figure 21).

2. Assemble the desired lengths of pipe
and elbows necessary to reach from the
fireplace flue up through the firestop.
All connections must be sealed with
high temperature silicone sealant as
specified in the second warning state­ment on page 6. Be sure all pipe and
elbow connections are fully twist­locked (see Figure 13, page 8).

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"x10" hole must
be measured on the horizontal; actual
length may be larger depending on the
pitch of the roof. There must be a 1"
clearance from the vent pipe to combus­tible materials. Frame the opening as
shown in Figure 14 on page 8.

If area above is a room, install firestop
above framed hole.

If area above is not a room, install
firestop below framed hole.

°

Figure 22 - Installing Firestop

10

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

Note:

If an offset is needed to avoid ob­structions, you must support the vent pipe
every 3 feet. Use wall straps for this pur­pose (see Figure 21). 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 as shown in Figure

21. There must be a 1" clearance from
the vent pipe to combustible materials.

When installing the flashing on a metal
roof we require that putty tape is used
between the flashing and the roof. The
flashing must be secured to the roof us­ing #8 x 3/4" screws and then sealed
with roof coating to prevent leakage
through the screw holes. A roof coat­ing must also be applied around the pe­rimeter to provide a proper seal.

6. Continue to add pipe sections until the
height of the vent cap meets the mini­mum building code requirements de­scribed in Figure 10 on page 5.
must increase vent height for steep roof
pitches. Nearby trees, adjoining rooflines,
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.

7. Twist-lock the vent cap onto the last
section of vent pipe and seal outer pipe
with high temperature silicone sealant
as specified in the second warning
statement on page 6.

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 and meet the minimum allowable clear­ances to combustibles. Do not fill any of the
required air spaces with insulation.

Note

: Y ou

Cathedral Ceiling Installation

1. Remove shingles or other roof cover-

ing as necessary to cut the rectangular
hole for the support box. Mark the out­line of the cathedral ceiling support box
on the roof sheathing using the locat­ing hole as a center point.

106442

OWNER’S MANUAL

VENTING
INSTALLATION

Continued

2. Cut the hole 1/8" larger than the sup­port box outline (see Figure 23, page 11).

3. Lower the support box through the hole
in the roof until the bottom of the box
extends at least 2" below the ceiling
(see Figure 23). Align the support box
vertically and horizontally using a
level. T emporarily tack the support box
in place through the inside walls and
into the roof sheathing.

4. Using tin snips, cut the support box from
the top corners down to the roofline and
fold the resulting flaps over the roof
sheathing (see Figure 24). Apply a bead
of non-hardening mastic around the top
edges of the support box to make a seal
between the box and the roof. Nail in
place with roofing nails. Remove any
combustible material that might be in­side of the support box.

5. Complete the cathedral ceiling instal­lation by following the same proce­dures outlined in steps 2 through 7 for

Level

Flat Ceiling Installation, page 10

Cathedral ceiling
support box

2" minimum below

finished ceiling

.

Vertical Termination Configurations

Figures 25 through 28 show four different configurations for vertical termination. All
connections must be sealed with high temperature silicone sealant as specified in the second
warning statement on page 6.

Venting with Two 90° Elbows

Vertical (V) Horizontal (H1) +

Horizontal (H2)

5' min. 2' max.
6' min. 4' max.
7' min. 6' max.
8' min. 8' max.

20' max. 8' max.

45° Starter Elbow

Figure 25 - Vertical Rigid Venting Configuration Using Two 90° Elbows with Two
Horizontal Runs

Cut hole 1/8" larger than support
box when projected onto roofline

Figure 23 - Cathedral Ceiling Support
Box Installation

Non-hardening Mastic under all
edges of support box before nailing

Figure 24 - Installed Cathedral Ceiling
Support Box

106442

Venting with One 90° Elbow

Vertical (V) Horizontal (H)

45° Starter Elbow

Figure 26 - Vertical Rigid Venting Configuration Using One 90° Elbow

11

5' min. 2' max.
6' min. 4' max.
7' min. 6' max.
8' min. 8' max.

20' max. 8' max.

Continued

®

MDVFST DIRECT-VENT GAS FIREPLACE

VENTING
INSTALLATION

Continued

45° Starter Elbow

45° Starter
Elbow

Flue
Restrictor

Venting with Two 90° Elbows

Vertical (V1) Horizontal (H)

5' min. 6' max.
6' min. 12' max.
7' min. 18' max.
8' min. 20' max.

Note:

Vertical (V1) +

Vertical (V2) = 20' max.

Figure 27 - Vertical Rigid Venting Configuration Using Two 90° Elbows

Flue
Restrictor

RVF Kit Shown

Vertical V enting

V = 40' max.

Figure 28 - Vertical Rigid Venting
Configuration With No Horizontal Run

12

106442

OWNER’S MANUAL

VENTING
INSTALLATION

Continued

HIGH ALTITUDE INSTALLATION

Your Vanguard direct-vent fireplace has
been CSA/AGA tested and approved for
elevations from 0-2000 feet and CGA certi­fied for elevations from 0-4500 feet.

When installing this fireplace at an elevation
above 2000 feet (in the USA), you may need
to decrease the input rating by changing the
existing burner orifice to a smaller size. Re­duce input 4% for each 1000 feet above sea
level. Check with your local gas company for
proper orifice size identification.

When installing this fireplace at an eleva­tion above 4500 feet (in Canada), check
with local authorities.

Consult your local gas company to help de­termine the proper orifice for your location.

For assistance with any high altitude installa­tion contact DESA International’s Technical
Service Department at 1-800-DESA-LOG
(1-800-337-2564).

PARTS LISTS FOR VENTING
KITS AND COMPONENTS

Note:

Terminations are not designed for

installation prior to transportation.

*NOTICE: The 7" x 30° Elbow sup­plied with kits CVK, BVK, SVK,
and RVF cannot be used. IT MUST
BE REPLACED WITH A 7" X 45°
STARTER ELBOW (D2060) PUR­CHASED SEPARATELY.

Vanguard Rigid Venting

Number Description

*MDV9K 9' Vertical Vent Kit

Includes one each: 48" Pipe, 36"
Pipe, 24" Pipe, 30° Elbow,
Firestop, Roof Flashing, Storm
Collar, Flue Restrictor Disc, and
Vertical Termination Cap

*MDVGFK

Ground Floor Horizontal Vent

(Allows horizontal installations

Kit

that run 49.5" min. vertically and 15"
horizontally from the back of the fire-

place to the outside wall.)

Includes one each: 12" Pipe,
7"-12" Adjustable Pipe, 30° Elbow,
90° Elbow, Firestop, Vinyl Stand­off, and Horizontal Termination Cap

Vanguard Rigid Venting

(Cont.)

Number Description

*CVK Corner Vent Kit (also used for

horizontal runs)

Includes: 7" x 30º Elbow, 7" x 90º
Elbow, 7" Adjustable Galvanized
Pipe (7-12"), 6" Pipe, Wall
Thimble, Horizontal Termination,
RTV Silicone and 20 Screws

*BVK Basement Rigid Vent Kit

Includes: 7" x 30° Elbow, 7" x 4'
Galvanized Pipe, 7" x 90° Elbow, 7"
Adjustable Galvanized Pipe (7-12"),
Wall Thimble, Horizontal Termina­tion, RTV Silicone and 20 Screws

*SVK Snorkel Rigid Vent Kit

Includes: 7" x 30° Elbow, 7" x 4'
Galvanized Pipe, 7" x 90° Elbow, 7"
Adjustable Galvanized Pipe (7-12"),
Wall Thimble, 36" Snorkel Termi­nation, RTV Silicone and 28 Screws

*RVF Roof Rigid Vent Kit

Includes: Flue Restrictor, Storm
Collar, 7" x 30° Elbow, 7" x 4'
Galvanized Pipe, 7" x 2' Galvanized
Pipe, 7" Adjustable Galvanized Pipe
(7-12"), Firestop Support, Roof
Flashing, RTV Silicone, Vertical
Termination, and 26 screws

D1000 7" x 12" Galvanized Coaxial

Pipe (6 pcs.)

D1010 7" x 24" Galvanized Coaxial

Pipe (6 pcs.)

D1020 7" x 48" Galvanized Coaxial

Pipe (6 pcs.)

D1030 7" Adjustable (7-12")

Galvanized Coaxial Pipe (6 pcs.)

D1050 7" x 6" Galvanized Coaxial

Pipe (6 pcs.)
D2000 7" x 90° Elbow (6 pcs.)
D2010 7" x 45° Elbow (6 pcs.)
*D2060 7" x 45° Starter Elbow
D3000 Wall Strap/Offset Support (6 pcs.)
D3010 Storm Collar (6 pcs.)
D3020 Wall Thimble (6 pcs.)
D3050 Vertical Restrictor (6 pcs.)
D3060 Ceiling Firestop/Support

(6 pcs.)
D3070 Rectangular Horizontal Rigid

Vent Termination Cap
D3071 Adjustable Horizontal Rigid

Vent Termination Cap
D3090 Cathedral Ceiling Support Box

*The D2060 45° starter elbow must be
purchased separately.

Vanguard Rigid Venting

(Cont.)

Number Description

D4000 Roof Flashing 6/12-9/12
D4010 Roof Flashing 9/12-12/12
D4020 Flex Connector (6 pcs.)
D4030 Flex Wall Thimble (6 pcs.)
D4040 4" Hose Clamp (6 pcs.)
D4050 7" Hose Clamp (6 pcs.)
D5000 Wood/Vinyl Siding Standoff

(6 pcs.)

Vanguard Flexible Venting

Number Description

FGFVK Flex Ground Floor Vent Kit

Includes: Flex Adapter, 7" x 4'
Flexible Pipe, 4" x 4' Flexible Pipe,
Wall Thimble, Horizontal Termi­nation, (4) Spacer Springs, (2) 4"
Hose Clamps, (2) 7" Hose Clamps,
RTV Silicone, and 10 Screws

D1040 7" x 25' Coaxial Flex Pipe

with Spacer Springs

D3080 Rectangular Horizontal

Flex Termination Cap

SIMPSON DURA-VENT
GS 4" x 6 5/8 "

Number Description

902 7" x 48" Pipe
903 7" x 36" Pipe
904 7" x 24" Pipe
906 7" x 12" Pipe
907 7" x 9" Pipe
908 7" x 6" Pipe
911 7" Adjustable (11"-14
940 Wall Thimble
941 Cathedral Ceiling Support Box
943 Roof Flashing 0/12-6/12
943S Roof Flashing 7/12-12/12
945 7" x 45° Elbow
950 Vinyl Siding Standoff
953 Storm Collar
963 Ceiling Firestop
981 36" Snorkel Termination
984 Horizontal Termination Vent Cap
988 Wall Strap
990 7" x 90° Elbow
991 Vertical High Wind Termination

5

/8") Pipe

106442

13

®

MDVFST DIRECT-VENT GAS FIREPLACE

INSTALLATION

WARNING: Disconnect all
electrical power to the fireplace.
Be careful of burrs and sharp
edges.

BLOWER ASSEMBLY

NOTE:

fireplace. Verify blower assembly place­ment during installation. The blower may
have shifted during shipping.

1. To remove lower louver, pull both top

2. Place blower assembly so it rests flush

Peninsula
or See-Thru
Fireplace
Installed

The blower is preinstalled in this

spring latches toward the center of the
appliance at the same time until they
are disengaged from the locating holes.
Repeat for bottom spring latches and
pull louver outward.

against the inside wall on the flue exit
side of the firebox (see Figure 29).
There are four magnets on the bottom
of the blower assembly that will keep
the blower in place on firebox bottom.

Note:

If the blower kit is not installed
flush against the inside side wall of the
fireplace, the circulating air from the
blower system will not flow properly.

Flue
Exit

BLOWER SPEED CONTROL

1. Place speed control switch assembly on
the bottom of the inside of the firebox
(see Figure 30). The assembly is equipped
with magnets on the left and right to prop­erly anchor it to the firebox.

2. Plug blower with speed control assem­bly into a power source. Keep hands
clear of fan when running.

Glass

Spring
Latch

Magnet

Figure 30 - Blower Speed Control Location

Speed Control

WIRING DIAGRAM

Wire Connectors
3 Places

BLOWER
ASSEMBLY

BLK (16 ga.)
BLK (16 ga.)

BLOWER
SPEED
CONTROL

High Speed
ON/OFF

1/4 Revolution

Low
Speed

Magnets

Figure 32 - Blower Speed Control

WALL SWITCH INSTALLATION

Since the MDVFST model uses a valve that
operates on millivolt current generated by
the pilot, a wall switch (not included) may
be used to activate the gas control valve
without the use of normal household elec­tricity. A hand-held, ON/OFF remote con­trol is standard with this unit. Wall switch is
optional. If the wall switch is installed, the
hand-held, ON/OFF remote cannot be used.

1. To remove the louvers, simultaneously
pull both top end spring latches towards
the center of the appliance until they
are disengaged from locating holes.
Repeat for bottom end spring latches
and pull outward. Reverse the proce­dure to install louvers back onto the
appliance (see Figure 33).

2. Connect the 18 ga. wires from wall
switch (not included) to the gas con­trol valve and microswitch, as shown
in Figure 34, page 15.

Inside

Wall
Blower
Assembly

Blower Center to
Firebox Bottom
Center Along Inside
Wall by Flue Exit

Figure 29 - Blower Assembly Placement

Figure 31 - Wiring Diagram for Blower
Assembly

BLOWER SPEED CONTROL
OPERATION

1. T o operate blower, turn the blower speed
control knob clockwise to the “ON” po­sition (see Figure 32). This will be the
highest blower speed. Continue turning
knob clockwise to reduce blower speed.
Turn knob only within the specified
range (1/4 revolution, see Figure 32).

2. To turn blower off, turn blower speed
control knob counterclockwise until it
clicks into the “OFF” position. You
must turn until knob clicks for the unit
to be completely off.

14

WARNING: Do not wire remote
wall switch to main power supply
(Standard 120v household current).

Glass

Figure 33 - Removing Louver

Locating
Holes

Spring
Latch

106442

OWNER’S MANUAL

INSTALLATION

Continued

Note:

This unit does

not have a HI/LOW

Optional Wall Switch

feature

Gas Valve

N

O

T

O

L

I

P

F

O

F

EA

O

T

L

I

P

16AI

7

To
Thermopile

TPTH TP TH

Route Millivolt Wires (Supplied)
Through Gas Line Conduit Sleeve

Figure 34 - Wall Switch Wiring Diagram

Note:

If any of the original wire supplied must be replaced, use type 18 AWG-105 degree

C (25 feet length MAXIMUM) or equivalent.

ELECTRICAL HOOKUP FOR
BLOWER ACCESSORY

Before blower accessory can be operated, it
must be properly connected to a standard
120 VAC power source. Refer to Wiring
Diagram on page 20.

An outlet box with two receptacles has been
supplied for your convenience, located on
the lower left side of the appliance (see

WIRELESS HAND-HELD
REMOTE CONTROL (GHRC
SERIES) INSTALLATION

Note:

If using the wireless hand-held re­mote control, the wall switch is no longer
operational.

NOTICE: Only use alkaline bat­teries (not included, requires 2).

Figure 35).

Installing Receiver

CAUTION: Due to high tem­peratures, make sure no wires
are touching the bottom of the
firebox.

From Blower
Assembly

Figure 35 - Connecting Blower Accessory
to Power Supply

106442

Note:

Receiver is preinstalled.

1. Remove access panel from lower front
face of firebox. Lift straight up on ac­cess panel until it stops. Pull bottom of
access panel forward, then down.

2. Disconnect wall switch wires from TH
and TPTH terminals on control valve
(see Figure 34).

3. Install remote receiver unit onto mount­ing bracket using the two plastic mount­ing clips (see Figure 36).

4. Connect wires to control valve. Con­nect white wire to terminal TH. Con­nect red wire to terminal TP/TH.

5. Locate the battery clip mounted on the
back of the receiver (see Figure 37).

6. Slide 9-volt battery (not included)
through the clip.

7. Attach the terminal wires to the battery
(see Figure 37).

8. Replace access panel. Place top of ac­cess panel into opening and slide up.
Push bottom of access panel in and
slide down to install.

15

(Back View)

Plastic

Receiver

Mounting
Clips

Mounting
Bracket

Figure 36 - Installing Remote Receiver
(Shown from Rear of Mounting Bracket)

9-Volt Battery

Battery Clip

Receiver

Terminal
Wires

Figure 37 - Installing Battery in Receiver

Installing 9-Volt Alkaline Battery in
Hand-Held Remote Control Unit

1. Remove battery cover on back of re­mote control unit.

2. Attach terminal wires to the battery
(not included). Place battery into the
battery housing.

3. Replace battery cover onto remote con­trol unit.

Battery

Terminal

Cover

Wires

9-Volt
Battery

Figure 38 - Installing Battery in Hand­Held Remote Control Unit

Remote
Control Unit

Battery
Housing

Continued

®

Back Wall

Of Appliance

MDVFST DIRECT-VENT GAS FIREPLACE

INSTALLATION

Continued

GAS LINE HOOKUP

WARNING: Before you pro­ceed, make sure your gas supply
is OFF.

WARNING: Gas line hookup
should be done by your gas sup­plier or a qualified service person.

An equipment shutoff valve has been in­cluded in the appliance’s gas supply system.
You may consider installing an extra gas
shutoff valve outside the appliance’s enclo­sure (check with local codes) where it can be
accessed more conveniently with a key
through a wall as shown in Figure 39.

Route a 1/2” NPT black iron gas line to­wards the appliance coming in from the left.
It is recommended to route the pipe between
the stand of the firebox and the surround of
the fireplace (see Figure 40).

IMPORTANT:

vidual equipment shutoff valve must be
disconnected from the gas supply piping
system during any pressure testing of that
system at test pressures in excess of 1/2 psig.
(3.5 kPa). The appliance must be isolated
from the gas supply piping system by clos­ing its individual equipment shutoff valve
during any pressure testing of the gas supply
piping system at test pressures equal to or
less than 1/2 psig. (3.5 kPa).

CAUTION: Do not kink flex­ible gas line.

The appliance and its indi-

CAUTION: Compounds used
on threaded joints of gas piping
shall be resistant to the action of
Liquefied Petroleum (LP or pro­pane), and should be applied
lightly to ensure excess sealant
does not enter the gas line.

1. Install a sediment trap between the in­coming gas line and the gas control
valve (see Figure 40). The sediment
trap should extend down the center of
the pipe. Refer to your local codes.

WARNING: All gas piping
and connections must be tested
for leaks after the installation is
completed.

After ensuring that the gas valve
is open, apply a soap and water
solution to all connections and
joints. If bubbles appear, leaks
can be detected and corrected.

Do not use an open flame for leak
testing and do not operate any
appliance if a leak is detected.

2. Prepare incoming gas line and check
with local codes regarding the use of
teflon tape. Complete your gas line in­stallation by connecting incoming gas
line with flexible gas line (included).
Secure tightly with a wrench, but Do

NOT Overtighten.

Equipment
ShutOff Valve

Key

Extension

Figure 39 - Typical Exterior Wall Gas
Shut-Off Installation

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

Sediment Trap (Not Supplied)

Figure 40 - Sediment Trap

GAS RATING

TYPE OF GAS NATURAL PROPANE/LP

Max. Input Rating: 30,000 Btu/hr 28,000 Btu/hr
Orifice Size (0-4,500 Ft.): 7/64" #52
Manifold Pressure: 3.5 in. WC 10.0 in. WC
**Minimum Supply Pressure: 4.5 in. WC 11.0 in. WC
**Maximum Supply Pressure: 10.5 in. WC 13.0 in. WC

Incoming 1/2"
Gas Line
Permitted by
Local Codes

** For the purpose of input adjustment.

16

106442

OWNER’S MANUAL

Left

Right

Back

Front

Left

Front

Right

Back

B

B

A

A

INSTALLATION

Continued

GAS SUPPLY TESTING

Note:

This section is intended as a guide for
qualified service technicians installing gas
to the appliance.

CAUTION: Do not connect
appliance before pressure test­ing gas piping. Damage to the
gas valve may result and an un­safe condition may be caused.

The gas control valve is secured underneath
the firebox with two brackets fastened to the
firebox bottom. Two pressure taps are pro­vided on the gas control valve for a pressure
gauge connection (see Figure 41).

Pilot Gas Line - Do Not Kink
Pilot Adjustment Cap
ON/OFF

Knob

N

O

T

O

L

I

P

F

O

F

EA

Inlet
Pressure

Outlet
Pressure

Figure 41 - Millivolt Control Valve

INSTALLING LOG SET

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

Before proceeding, make sure the gas con­trol valve is in the “OFF” position. Logs
have been packaged separately to prevent
damage to glass or refractory.

1. Remove top and bottom louvers by si­multaneously pulling both top end
spring latches towards the center of the
appliance until they are disengaged from
locating holes. Repeat for bottom end
spring latches and pull outward. Reverse
procedure to install louvers back.

106442

O

T

L

I

P

16AI

Conversion Screw

7

To Pilot
Burner

TPTH TP TH

To Main
Burner

2. Remove the screen rod by sliding
spring clip on one end toward the cen­ter. Slide rod into screen rod hole until
other end of rod is free. Remove rod.

3. To open the glass door, open the pairs
of latches located on the top and bottom
of the firebox (see Figure 42).

Note:

Use

caution when opening these latches.

4. Carefully open the door. The glass door
is mounted to the firebox with 5 screws.

5. To remove the logs from the shrink
wrap, carefully cut the plastic around
the perimeter of the log. Do not try to
remove the logs from the package with­out first cutting the plastic.

6. Figure 43 shows the log set. Logs “A”
have the knot at the end of the log. Logs
“B” have the knot at the middle of the
log. T wigs “C” have the shape of a “Y”.
T wigs “D” have the shape of bent twigs.
Twig “E” is a straight twig which is
placed across the top of Logs “B”.

7. Figure 44 shows the top view of the
burner and grate.

8. Place logs “A” as shown in Figure 45.

9. Place logs “B” as shown in Figure 46 .
Lift the end of log “A” that will be
propped up and place log “B” under it.
At the same time, the other side of log
“B” is placed over the other log “A”.
Repeat procedure for the other log “B”.

10. Take twigs “C” (shaped like a “Y”)
and place them as shown in Figure 47.

11. Take twigs “D” (bent twig) and place
them as shown in Figure 47.

12. Place twig “E” across the top of logs
“B” a shown in Figure 47.

13. When finished installing the logs, close
the glass doors while making certain that
the safety door switch is fully depressed
by the door frame before securing the
four (4) spring loaded latches.

14. Replace the louvers in reverse order with
the grilles pointing in the down position.

Open

Close

Figure 42 - Removing Glass Door

17

D

B

C

A

E

C

B

A

D

Figure 43 - Log Set (9 Pieces)

Left

Back

Front

Right

Figure 44 - Burner and Grate (Top View)

Figure 45 - Installing Logs “A” (Top View)

Figure 46 - Installing Logs “B ” (Top View)

Left

D

Back

C

E

Right

C

D

Figure 47 - Installing Twigs “C, D, E ” (Top
View)

Continued

Front

®

MDVFST DIRECT-VENT GAS FIREPLACE

INSTALLATION

Continued

DECORATIVE FACING

Any noncombustible material may be used
for facing (glass, tile, brick, etc.) as long as
the proper clearances are observed (see
Clearances, page 3).
vered openings must not be obstructed, and
upper and lower panels must remain remov­able for servicing. Use only heat-resistant,
noncombustible mortar or adhesive when
securing facing material.

Note:

Combustible material, such as wood,
that has been fireproofed is not considered
noncombustible.

IMPORTANT:

Lou-

PILOT ASSEMBLY
ADJUSTMENT

The pilot assembly is factory preset for the
proper flame height. Alteration to these set­tings may have occurred during shipping and
handling. If this is the case, some minor
adjustment may be necessary and should be
done by a qualified technician. To access the
pilot assembly, the glass door must be opened.
The proper settings for the thermopile height
should be at a distance of 3/8" to 1/2" from the
pilot flame as shown in Figure 48.

1/8"

(3mm)

Figure 48 - Correct Pilot Flame Pattern

3/8" - 1/2"
(9.5mm-12.3mm)

BURNER FLAME
ADJUSTMENT

The air shutter, located at the underside of the
main burner (see Figure 49), has been factory
preset to the proper air-to-gas ratio which
results in an even, clean burning flame across
the burner (see Figure 50). If readjustment is
necessary, you can restore the proper air-to­gas ratio by loosening the air shutter screw
and rotating the air shutter until the proper
flame setting is achieved (see page 22, col­umn 2 for proper shutter settings). Do not
forget to retighten the air shutter screws.

Air Shutter

Firebox Bottom

Figure 49 - Connecting Venturi and Orifice

CORRECT

INCORRECT
CLOSE
SHUTTER

INCORRECT
OPEN
SHUTTER

Figure 50 - Burner Flame Patterns

Orifice

Long, Blue Flame
with Yellow Tips

Short, Sharp,
Blowing Flame

Long, Uneven,
Yellow Flame

Burner

Venturi
Tube

Burner Gas Line

BURNER REMOVAL

CAUTION: Before proceeding,

make sure the entire unit is cool.

1. Remove the top and bottom louvers
and screen. Open the glass door (left
or right side).

2. Carefully remove the log set.

3. Remove the screw that attaches the
burner to the bracket.

4. Slide the burner towards the front of the
unit, lift, and remove from the firebox.

5. To reinstall the burner , slide the burner
towards the rear of the unit and secure
burner to bracket with screw .

CAUTION: Make certain the
orifice is inside the venturi tube's
air shutter, see Figure 49.

6. Replace the log set, close door with
latches, and attach screen and louvers.

OPERATING
GUIDELINES AND
MAINTENANCE
INSTRUCTIONS

When lit for the first time, the appliance may
emit a slight odor for about 16 - 24 hours.
This is normal and is due to the “curing” of
the logs and the “burn-in” of internal paints
and lubricants used in the manufacturing
process. Keep compartments, logs, burners,
and area surrounding the logs clean by vacu­uming or brushing at least twice a year.
Temporary removal of the log set may ease
the cleaning of the burner and pilot assem­bly. In cleaning, take care not to alter the
pilot or burner location. Be sure appliance is
cool before each maintenance session.

CAUTION: The appliance and
logs can get very hot - Handle
only when cool.

WARNING: Turn off gas and
wall switch before servicing ap­pliance. Any safety screen or
guard removed for servicing the
appliance must be replaced prior
to operating the appliance.

Any household glass cleaner may be used to
clean the glass panel. Do not use abrasive
cleaners as this may damage the glass. Clean

glass only when cool.

WARNING: Do not operate
appliance with panel(s) and glass
removed, cracked, or broken. Re­placement of the panel(s) should
be done by a licensed, qualified
service person.

WARNING: Make certain wires
and gas lines are not touching
the underside of the firebox.

18

106442

OWNER’S MANUAL

OPERATING
GUIDELINES AND
MAINTENANCE
INSTRUCTIONS

Continued

CAUTION: If the glass breaks,
be cautious of fragments on the
floor. Keep children away from
the area. Do not operate the unit.
Use proper safety gloves to re­move the broken glass door. Dis­card safely. A glass door kit can
be ordered through your local
distributor. Do not substitute
other material for the glass.

WARNING: Children and
adults should be alerted to the
hazards of high surface tempera­tures, and to stay away from the
appliance to avoid burns or cloth­ing ignition. Young children
should be carefully supervised
when they are in the same room
as the appliance.

WARNING: Have a qualified
service agency periodically in­spect the vent system at the start
of each heating season, for any
obstruction which may hinder
its normal operation. Never ob­struct the flow of combustion
and ventilation air. Keep the front
of the appliance clear of all ob­stacles and materials.

WARNING: Do not abuse,
strike, or slam the glass doors.

CAUTION: Label all wires
prior to disconnection when ser­vicing controls. Wiring errors
can cause improper and danger­ous operation.

For further operating guidelines, contact
your authorized dealer.

OPERATING
FIREPLACE

FOR YOUR SAFETY

READ BEFORE

LIGHTING

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

A. This appliance has a pilot which must

be lighted by hand. When lighting the
pilot, follow these instructions exactly .

B. BEFORE LIGHTING 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

• Do not try to light any appliance.

• Do not touch any electric switch; do
not use any phone in your building.

• Immediately call y our 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. Ne ver use tools.
If the knob will not push in or turn
by hand, don’t try to repair it, call a
qualified service technician or gas
supplier. Force or attempted repair
may result in a fire or explosion.

D. Do not use this appliance if any part

has been under water. Immediately
call a qualified service technician to
inspect the appliance and to replace
any part of the control system and
any gas control which has been un­der water.

LIGHTING

INSTRUCTIONS

1. STOP! Read the safety information,
column 2, on this label before pro­ceeding.

2. Turn off all electrical power to the
appliance.

3. Open control access panel.

4. Push in gas control knob slightly and
turn clockwise to “OFF”.

5. Wait five (5) minutes to c lear out any
gas. Then smell for gas, including
near the floor. If you smell gas,
STOP! Follow “B” in the safety in­formation on this page. If you don’t
smell gas, go to the next step.

6. The pilot is located by the main
burner.

7. Turn knob on gas control counter­clockwise to “PILOT”.

8. Push in the control knob all the way
and hold in. Immediately light the pi­lot by pressing the ignitor button
until a flame appears one (1) minute
after the pilot is lit. Release knob and
it will pop back up. Pilot should re­main lit. If it goes out, repeat steps 4
through 8.

• If knob does not pop out when r e-

leased, stop and call gas supplier.

• If the pilot will not stay lit after sev-

eral tries, turn gas control knob to
“OFF” and call your service tech­nician or gas supplier.

9. Tur n gas control knob counterclock­wise to “ON”. Knob can be
turned to “ON” only if the control

knob is popped out.

10. Turn on all electric power to the ap­pliance (remote control or wall
switch).

Gas Control Knob

N

O

T

O

L

I

P

F

EA

Position Indicator

Figure 51 - Control Knob in the PILOT
Position

Conversion Screw

O

F

O

T

L

I

P

16AI

7

TPTH TP TH

Continued

106442

19

®

MDVFST DIRECT-VENT GAS FIREPLACE

OPERATING
FIREPLACE

Continued

TO TURN OFF GAS

TO APPLIANCE

1. Turn off remote control or wall
switch.

2. Tur n off all electric power to the ap­pliance if service is to be performed.

3. Remove control access panel.

4. Push in gas control knob slightly and
turn clockwise to “OFF”. Do

not force.

5. Replace control access panel.

Note:

It is recommended that you main­tain the gas control knob in the full "OFF"
position during lengthy periods of sea­sonal non-usage.

REMOTE

OPERATION

Follow instructions included with the re­mote control.

NOTICE: You must light the pilot
before using the hand-held re­mote control unit. See

Instructions

, page 19.

Lighting Instructions

1. After lighting, let pilot flame burn for

about one minute. Turn control knob
to ON position. Slide the selector switch
to the REMOTE position.
burners may light if hand-held remote
ON button was on when selector switch
was last turned off. You can now tur n
the burners on and off with the hand­held remote control unit.

IMPORTANT:

lector switch in the REMOTE posi­tion when the pilot is not lit. This will
drain the battery.

IMPORTANT:

ON/OFF buttons on the hand-held
remote control unit for up to 3 sec­onds to assure proper operation.

2. Press ON/OFF button to turn the

burners on and off. When turning
burners off, the pilot will remain lit.

Do not leave the se-

Be sure to press the

Lighting

Note:

The

Piezo Ignitor

Thermocouple

Pilot Burner

Thermopile

Figure 52 - Pilot

Control Knob in
On Position

P

I

L

O

F

T

ON
OFF
REMOTE

F

O

O

N

Selector Switch in
Remote Position

Figure 53 - Setting the Selector Switch,
Control Knob, and Flame Adjustment
Knob for Remote Operation

WIRING DIAGRAM

Pilot

Thermopile

Pilot

Gas Line

TH

TP

TH/TP

Variable
Speed
Control

Thermocouple

Incoming
Main
Gas
Supply

Piezo Ignitor

Control
Valve

Electrical Rating:
120v, 60Hz, 0.7A

Piezo Ignitor

Remote

Control

Wireway

Do Not
Connect
To 120V

N.O.SW

(Wall Switch)

GND

N.O.SW

BLK
WHT
GRN

Connectors
(Not Supplied)

Field Wire

Incoming

120V AC

(Fuse Box

or

Breaker)

20

106442

OWNER’S MANUAL

INSTALLATION
INSTRUCTIONS
FOR CONVERSION
NATURAL TO
PROPANE/LP

WARNING: This conversion
kit shall be installed by a quali­fied service agency in accordance
with the manufacturer instruc­tions and all applicable codes
and requirements of the author­ity having jurisdiction. If the in­formation in these instructions is
not followed exactly, a fire, ex­plosion, or production of carbon
monoxide may result causing
property damage, personal injury,
or loss of life. The qualified ser­vice agency is responsible for
the proper installation of this kit.
The installation is not proper and
complete until the operation of
the converted appliance is
checked as specified in the
manufacturer’s instructions sup­plied with the kit.

Wait five (5) minutes to clear out any gas.
Smell for gas, including near the floor. If you
smell gas, STOP! Follow “B” in the For Your
Safety, Read Before Lighting, page 19.

PREPARATION

To remove louvers , pull end spring latches
toward the center of the appliance simulta­neously until they are disengaged from lo­cating holes.

To open glass door, undo the latches located
on the top and bottom of the firebox (see
Figure 56). Carefully swing the glass door
to the fully open position.

Carefully remove the log set and grate from
the burner and place them outside the com­bustion chamber. Remove two screws hold­ing the burner and remove burner. Remove
the two side refractories and hearth pan (see
Figure 55).

Glass Door

INSTALLATION

Remove the main burner orifice and replace
with the propane/LP conversion orifice sup­plied in the conversion kit (see Figure 57).
Apply a small amount of thread sealant to
the main burner orifice before tightening.

Remove the compression nut from the pilot
and replace the propane/LP pilot orifice with
supplied orifice from conversion kit (see
Figure 57).

IMPORTANT:

kink aluminum tubing during the conver­sion. Make sure the compression sleeve and
pilot orifice are properly mated and aligned
before retightening the compression nut.

Be careful not to bend or

Main
Burner
Orifice

BEFORE YOU BEGIN

The conversion parts are packaged with the
unit. Please check the contents before be­ginning this conversion.

Main Burner
Orifice
Propane/LP

Propane/LP
Pilot orifice

Note:

The pilot orifice has
the number 30 stamped
on it for identification
purposes.

Figure 54 - Main Burner Orifice and Pilot
Orifice

Make sure the gas control valve is in the
OFF position and all electrical power to the
appliance of OFF.

Louvers

Grate and Logs

Burner

Hearth Pan

Refractories

Figure 55 - Remove Louvers, Logs,
Burner, Hearth Pan, and Refractories

OPEN

CLOSE

Figure 56 - Open Latch

Pilot
Orifice

Sleeve

Compression
Nut

Figure 57 - Main Burner Orifice and Pilot
Orifice

Continued

106442

21

®

MDVFST DIRECT-VENT GAS FIREPLACE

INSTALLATION
INSTRUCTIONS
FOR CONVERSION
NATURAL TO
PROPANE/LP

Continued

The SIT Nova millivolt valve converts from
natural gas to propane/LP gas with the re­versal of the conversion screw located on
the stem in the top of the valve (see Figure

58). The valve is located in the bottom of the
fireplace underneath the firebox.

Remove the conversion screw from the valve
and rotate the screw 180 degrees. The screw
is clearly marked as NG or LPG, insure that
the LPG is facing outward. Tighten the
screw fully but do not over tighten.

Position the hearth pan and the two side
refractories back into position in the com­bustion chamber and fasten the burner back
into position with the two screws.

Carefully position the grate and logs back
into position (see Installing Log Set, page

17). Be careful not to alter the pilot or burner
location.

Close the glass door, making certain the
door is fully sealed.

Replace the louvers by depressing the latches
and inserting the pins into the mating holes
on the front face.

The conversion from natural gas to propane/
LP is now complete.

Refer to Lighting Instructions on page 19.

SIT Nova
Millivolt Valve

Conversion
Screw

ON

T

O

L

I

P

OFF

Stem

Top

Figure 58 - Valve

ADJUSTING AIR SHUTTER

The air shutter, located at the underside of the
main burner (see Figure 59), has been factory
preset to the proper air-to-gas ratio which
results in an even, clean burning flame across
the burner (see Figure 60). If readjustment is
necessary, you can restore the proper air-to­gas ratio by loosening the air shutter screw
and rotating the air shutter until the proper
flame setting is achieved (the shutter's nor­mal setting for propane/LP gas is fully open
and approximately 5/16" opening for natu­ral gas). Do not forget to retighten the air
shutter screws.

Air Shutter

Firebox Bottom

Figure 59 - Connecting Venturi and Orifice

CORRECT

INCORRECT
CLOSE
SHUTTER

INCORRECT
OPEN
SHUTTER

Figure 60 - Burner Flame Patterns

Orifice

Long, Blue Flame
with Yellow Tips

Short, Sharp,
Blowing Flame

Long, Uneven,
Yellow Flame

Burner

Venturi
Tube

Burner Gas Line

22

106442

OWNER’S MANUAL

TROUBLESHOOTING

Note:

For additional help, visit DESA

International’s technical service web
site at www.desatech.com.

Note:

Before troubleshooting the system,

make sure the equipment shutoff valve is ON.

OBSERVED PROBLEM

Pilot will not light

No gas to burner, although wall switch and
valve are set to the ON position

WARNING: Turn off fireplace
and let cool before servicing. Only
a qualified service person should
service and repair fireplace.

Note:

All troubleshooting items are listed in

order of operation.

POSSIBLE CAUSE

1. No gas supply, or shutoff valve is OFF

2. Air in gas line

3. Construction debris clogging pilot orifice

4. Low gas pressure

5. Control valve knob is not on the PILOT
position

6. Kinked pilot line

7. Bad valve

8. Bad thermocouple or loose connection

1. W all switch wires defective

CAUTION: Never use a wire,
needle, or similar object to clean
pilot. This can damage pilot unit.

REMEDY

1. Check to see if you have gas supply

2. Hold control valve in the PILOT position
for 2 to 3 minutes to purge air . If you smell
gas stop and wait for a few minutes before
trying to light the fireplace

3. Remove debris and dirt, inspect and clean
any other possible obstructions

4. Contact your gas supplier

5. Refer to section on pilot lighting

6. Have a qualified technician replace pilot
line

7. Replace control valve (see Replacement
Parts, page 26)

8. Tighten thermocouple or replace

1. Check electrical connections

Frequent pilot outage

Burner goes off after a short time

When ignitor button is pressed, there is no
spark at pilot

Remote does not function

1. Pilot flame may be too low, causing
safety pilot to “drop out”

1. Venting recirculation problem

1. Ignitor electrode not connected to igni­tor cable

2. Ignitor cable pinched or wet

3. Piezo ignitor nut is loose

4. Broken ignitor cable

5. Bad piezo ignitor

6. Ignitor electrode broken

7. Ignitor electrode positioned wrong

1. Battery is not installed. Battery power
is low

1. Clean and adjust pilot flame for maximum
flame impingement on thermopile

1. Have a qualified technician check vent­ing system for leaks or obstructions.
Have a qualified technician measure the
pilot’s millivoltage

1. Reconnect ignitor cable

2. Free ignitor cable if pinched by any metal
or tubing. Keep ignitor cable dry

3. Tighten nut holding piezo ignitor . Nut is
located behind the mounting bracket

4. Replace ignitor cable

5. Replace piezo ignitor

6. Replace pilot assembly

7. Replace pilot assembly

1. Replace 9-volt batteries in receiver and
remote control

106442

www.desatech.com

23

Continued

®

MDVFST DIRECT-VENT GAS FIREPLACE

TROUBLESHOOTING

Continued

OBSERVED PROBLEM

When ignitor button is pressed, there is
spark at pilot but no ignition

Pilot lights but flame goes out when control
knob is released

POSSIBLE CAUSE

1. Gas supply turned off or equipment
shutoff valve closed

2. Control knob not in PILOT position

3. Control knob not pressed in while in
PILOT position

4. Air in gas lines when installed

5. Depleted gas supply (propane/LP
models only)

6. Pilot is clogged

7. Gas regulator setting is not correct

1. Control knob not fully pressed in

2. Control knob not pressed in long enough

3. Equipment shutoff valve not fully open

4. Pilot flame not touching thermocouple,
which allows thermocouple to cool,
causing pilot flame to go out. This prob­lem could be caused by one or both of
the following:
A) Low gas pressure
B) Dirty or partially clogged pilot

5. Thermocouple connection loose at con­trol valve

6. Thermocouple damaged

7. Control valve damaged

REMEDY

1. Turn on gas supply or open equipment
shutoff valve

2. Turn control knob to PILOT position

3. Press in control knob while in PILOT
position

4. Continue holding down control knob.
Repeat igniting operation until air is
removed

5. Contact local propane/LP gas company

6. Clean pilot or replace pilot assembly

7. Replace gas control

1. Press in control knob fully

2. After pilot lights, keep control knob
pressed in 30 seconds

3. Fully open equipment shutoff valve

4. A) Contact local gas company
B) Clean pilot or replace pilot assembly

5. Hand tighten until snug, then tighten
1/4 turn more

6. Replace thermocouple

7. Replace control valve

Burner does not light after pilot is lit

Delayed ignition burner

Burner backfiring during combustion

Slight smoke or odor during initial operation

Fireplace produces a whistling noise when
burner is lit

1. Burner orifice clogged

2. Inlet gas pressure is too low

3. Thermopile leads disconnected or im­properly connected

4. Thermopile is defective

1. Manifold pressure is too low

2. Burner porting or orifice clogged

1. Burner orifice is clogged or damaged

2. Damaged burner

3. Gas regulator defective

1. Residues from manufacturing processes
and logs curing

1. Air in gas line

2. Dirty or partially clogged burner orifice

www.desatech.com

24

1. Clean burner or replace burner orifice

2. Contact local propane/LP or natural gas
company

3. Reconnect leads

4. Replace thermopile

1. Contact local propane/LP or natural gas
company

2. Clean burner

1. Clean burner or replace burner orifice

2. Replace damaged burner

3. Replace gas control

1. Problem will stop after a few hours of
operation

1. Operate burner until air is removed from
line. Have gas line checked by local pro­pane/LP gas company

2. Clean burner or replace burner orifice

or replace burner orifice

106442

TROUBLESHOOTING

Continued

OBSERVED PROBLEM

Glass soots

OWNER’S MANUAL

POSSIBLE CAUSE

1. Flame impingement on logs

2. Debris around burner air mixer

REMEDY

1. Adjust the log set so that the flame does
not excessively impinge on it

2. Inspect the opening at the base of the
burner to see that it is NOT packed with
any type of material

Fireplace produces a clicking/ticking noise
just after burners are lit or shut off

WARNING: 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.

• If you cannot reach your gas supplier, call the fire department.

IMPORTANT:

cigarette smoke, cements and glues, new carpet or textiles, etc., create fumes. These fumes may mix with combustion air
and create odors.

Fireplace produces unwanted odors
Fireplace shuts off in use

Operating fireplace where impurities in air exist may create odors. Cleaning supplies, paint, paint remover,

1. Metal expanding while heating or con­tracting while cooling

1. Gas leak. See W arning statement above

1. High or gusting winds

2. Low line pressure

3. Pilot is partially clogged

4. Inner vent pipe leaking exhaust gasses
into system

5. Horizontal vent improperly pitched

6. Glass too loose and air tight gasket leaks
in corners after usage

7. Bad thermopile or thermocouple

8. Improper vent cap installation

1. This is common. If noise is excessive,
contact qualified service person

1. Locate and correct all leaks

1. Fireplace has been tested for up to
40mph winds. However, extreme con­ditions may occur

2. Contact local propane/LP or natural gas
company

3. Clean pilot

4. Locate and correct all leaks

5. Horizontal vent termination should slope
down only enough to prevent any water
from entering the unit. The maximum
downward slope of the vent termination
is 1/4" for any horizontal run

6. Tighten glass

7. Replace faulty component

8. Check for proper installation and free­dom from debris or blockage

Gas odor even when control knob is in OFF
position

Gas odor during combustion
Dark residue on logs or inside of fireplace

106442

1. Gas leak. See W arning statement above

2. Control valve defective

1. Gas leak. See W arning statement above

1. Improper log placement

2. Air holes at burner inlet blocked

3. Burner flame holes blocked

www.desatech.com

25

1. Locate and correct all leaks

2. Replace control valve

1. Locate and correct all leaks

1. Properly locate logs

2. Clean out air holes at burner inlets. Pe­riodically repeat as needed

3. Remove blockage or replace burner

®

MDVFST DIRECT-VENT GAS FIREPLACE

SERVICE HINTS

When Gas Pressure Is Too Low

• pilot will not stay lit

• burner will have delayed ignition

• fireplace will not produce specified heat

• propane/LP gas supply may be low

When Gas Quality Is Bad

• pilot will not stay lit

• burner will produce flames and soot

• fireplace will backfire when lit
You may feel your gas pressure is too low or

gas quality is bad. If so, contact your local
propane/LP gas supplier.

ACCESSORIES

LOUVER KIT

Brass - FLP36 (01628)

GWMS2 - WALL MOUNT
ON/OFF SWITCH KIT

Allows the fireplace to be turned on and off
with a wall switch.

TECHNICAL
SERVICE

You may have further questions about in­stallation, operation, or troubleshooting. If
so, contact DESA International’s Technical
Service Department at 1-800-323-5190.

You can also visit DESA International’s
technical services web site at

www.desatech.com.

REPLACEMENT
PART S

Note:

Use only original replacement parts.

This will protect your warranty coverage for
parts replaced under warranty.

PARTS UNDER WARRANTY

Contact authorized dealers of this product.
If they can’t supply original replacement
part(s) call DESA International’s Technical
Service Department at 1-800-323-5190 for
referral information.

When calling DESA International, have
ready

• your name

• your address

• model and serial numbers of your fireplace

• how fireplace was malfunctioning

• type of gas used (propane/LP or natural
gas)

• purchase date

Usually, we will ask you to return the defec­tive part to the factory.

PARTS NOT UNDER
WARRANTY

Contact authorized dealers of this product.
If they can’t supply original replacement
part(s) call DESA International’s Parts De­partment at 1-800-972-7879 for referral in­formation.

When calling DESA International, have
ready

• model number of your fireplace

• the replacement part number

RECEIVER AND HAND-HELD
ON/OFF REMOTE CONTROL
KIT - GHRC

For all models. Allows the gas log heater to
be turned on and off by using a hand-held
remote control.

BLOWER KIT - DVFFBK

For all models. Increases air circulation to
maximize heat distribution.

D

A

E

C

B

A

B

C

D

LOG SET - 105891-01 (27237)

Log Piece A - 105896-01 (27238)
Log Piece B - 105895-01 (27239)
Log Piece C - 105893-01 (27242)
Log Piece D - 105892-01 (27240)
Log Piece E - 105894-01 (27241)

ORIFICE

Natural - 105890-01 (27224)
Propane/LP - 105890-02 (25238)

26

106442

REPLACEMENT
PARTS

Continued

OWNER’S MANUAL

PILOT ASSEMBLY

Natural - 105883-01 (25701)
Propane/LP - 105883-02 (25702)

If in need of replacing, have a qualified
technician replace it.

Front (Bottom)

Left/Right (Bottom)

PIEZO IGNITOR - 105884-01
(14261)

SCREEN ASSEMBLY
105898-01 (25903)

NG

BURNER ASSEMBLY
105885-01 (27243)

LOUVER KIT

Black - 105904-01 (01627)

Rear (Used for Peninsula and See-Thru)

Front (Used for See-Thru Only)

REFRACTORY PIECES

Front (Bottom)
105886-01 (25854)
Left/Right (Bottom)
105887-01 (25856)
Rear - 106924-01 (27374)
Front - 105888-01 (25885)

106442

GAS CONTROL VALVE

Convertible Control
104496-03(14480)

If in need of replacing, have a qualified
technician replace it.

GRATE - 105889-01 (11184)

27

DOOR ASSEMBLY (Tempered)
106923-01 (27200)

WARRANTY INFORMATION

KEEP THIS WARRANTY

Model
Serial No.
Date Purchased

Always specify model and serial numbers when communicating with the factory.
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our standard written

warranty. We make no other warranty, expressed or implied.

LIMITED WARRANTY

DIRECT-VENT FIREPLACE

DESA International warrants this product to be free from defects in materials and components for four (4) years from the date of first purchase,
provided that the product has been properly installed, operated and maintained in accordance with all applicable instructions. To make a claim
under this warranty the Bill of Sale or cancelled check must be presented.

This warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s) required to restore this heater to proper
operating condition and an allowance for labor when provided by a DESA Authorized Service Center. Warranty part(s) MUST be obtained
through authorized dealers of this product and/or DESA International who will provide original factory replacement parts. Failure to use
original factory replacement parts voids this warranty. The heater MUST be installed by a qualified installer in accordance with all local codes
and instructions furnished with the unit.

This warranty does not apply to parts that are not in original condition because of normal wear and tear, or parts that fail or become damaged
as a result of misuse, accidents, lack of proper maintenance or defects caused by improper installation. Travel, diagnostic cost, labor,
transportation and any and all such other costs related to repairing a defective heater will be the responsibility of the owner.

TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE OF THE PRODUCT;
THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED WARRANTIES AND LIMITS THE DURATION
OF ANY AND ALL IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE TO FOUR (4) YEARS ON ALL COMPONENTS FROM THE DATE OF FIRST PURCHASE; AND DESA
INTERNATIONAL’S LIABILITY IS HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND DESA INTERNA­TIONAL SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES.

Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of incidental or consequential
damages, so the above limitation on implied warranties, or exclusion or limitation on damages may not apply to you.

This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.
For information about this warranty write:

INTERNATIONAL

2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004

www.desatech.com

106442 01

NOT A UPC

106442-01
Rev. A
02/00