Montigo L52DF-ST Instruction Manual

L52DF-ST Indoor
L-Series
Residential
Fireplace
®
C US
Read and understand this manual. Improper installation, adjustment, alteration,
service or maintenance can cause serious injury, property damage or even death.
For assistance or additional information consult a qualified installer, service
agency or the gas supplier.
DANGER
Glass doors on gas fireplaces are extremely hot while the fireplace is on and
remain hot even after the fireplace has been turned off. Safety screens are
available and can reduce the risks of severe burns. Please keep children away
from the fireplace at all times.
CAUTION
Installation & Maintenance Manual
Do not store or use gasoline or any other flammable vapors and liquids in the vicinity of
this or any other gas burning appliance. A fire or explosion my occur causing serious
injury, property damage or even death.
WARNING
Installer: Leave this manual with the appliance. Do not remove.
Consumer: Retain this manual for maintenance and future reference. Do not Discard.
NOTICE
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.
DANGER
Irritant
Cutting
Watch your step
Slippery floor
High temperatures
Glass hazard
Danger of suffocation
High voltage
Toxic
Flammable materials
Corrosive
Fork lift trucks
Danger overhead crane
Explosion risk
Oxidising
Danger of death
Biohazard
Laser Radiation
Danger of entrapment
Hot surface
General Warning
Blank
Gas bottles
Watch for
falling objects
Electricity
Danger for cutter
Entrapment hazard
Battery hazard
Rotating parts
Low temperature
Strong magnetic field
Optical radiation
Non ionizing
radiation
Radiation
Hazardous to the
Environment
Danger of harming
your hands
Irritant
Cutting
Watch your step
Slippery floor
High temperatures
Glass hazard
Danger of suffocation
High voltage
Toxic
Flammable materials
Corrosive
Fork lift trucks
Danger overhead crane
Explosion risk
Oxidising
Danger of death
Biohazard
Laser Radiation
Danger of entrapment
Hot surface
General Warning
Blank
Gas bottles
Watch for
falling objects
Electricity
Danger for cutter
Entrapment hazard
Battery hazard
Rotating parts
Low temperature
Strong magnetic field
Optical radiation
Non ionizing
radiation
Radiation
Hazardous to the
Environment
Danger of harming
your hands
Irritant
Cutting
Watch your step
Slippery floor
High temperatures
Glass hazard
Danger of suffocation
High voltage
Toxic
Flammable materials
Corrosive
Fork lift trucks
Danger overhead crane
Explosion risk
Oxidising
Danger of death
Biohazard
Laser Radiation
Danger of entrapment
Hot surface
General Warning
Blank
Gas bottles
Watch for
falling objects
Electricity
Danger for cutter
Entrapment hazard
Battery hazard
Rotating parts
Low temperature
Strong magnetic field
Optical radiation
Non ionizing
radiation
Radiation
Hazardous to the
Environment
Danger of harming
your hands
Irritant
Cutting
Watch your step
Slippery floor
High temperatures
Glass hazard
Danger of suffocation
High voltage
Toxic
Flammable materials
Corrosive
Fork lift trucks
Danger overhead crane
Explosion risk
Oxidising
Danger of death
Biohazard
Laser Radiation
Danger of entrapment
Hot surface
General Warning
Blank
Gas bottles
Watch for
falling objects
Electricity
Danger for cutter
Entrapment hazard
Battery hazard
Rotating parts
XG0185 100511
Canadian Heating Products Inc. Langley, BC V4W 4A1 | Montigo Del Ray Corp. Ferndale, WA 98248

Page 2
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
Section 5: Installing the Gas Line .......................................... 13
Section 5-1: Fuel Conversion ........................................ 13
Section 5-2: Gas Pressure ............................................ 13
Section 5-3: Gas Connection......................................... 13
Section 6: Finishing ............................................................... 14
▪ Finishing around the replace .................................. 14
▪ Installing the nailing ange extension ........................ 14
Section 7: Installing and Removing the Door ........................ 15
Section 8: Installing the Accessories ..................................... 16
▪ Installing the L38DF-ST Firestones ........................... 16
▪ Installing the L38DF-ST Articial River Rocks ............ 16
Section 9: Operation .......................................................17 - 19
▪ Start-up Sequence with Continuous Pilot .................. 17
▪ Start-up Sequence Honeywell Gas valve ...........18 - 19
Maintenance ................................................................... 20 - 21
▪ General ................................................................. 20
▪ Cleaning ................................................................ 20
▪ SIT Hi-Lo Burner Adjustment ................................... 20
▪ SIT Pilot Burner Adjustment .................................... 20
▪ Troubleshooting ...................................................... 21
SIT- Nova 820 Gas Control Valve ....................... 21
Honeywell Gas Control Valve ........................... 21
▪ Parts List ............................................................... 22
Appendix
A. Termination Locations .......................................... 23
B. Warranty ............................................................ 24
C. State of Massachusetts. ...................................... 25
Safety Alert Key
Introduction ............................................................................... 3
Models............................................................................ 3
Installation
Before you Start ............................................................. 4
Installation Checklist ...................................................... 4
Section 1: Installation Overview and Product Dimensions ...... 5
Section 2: Framing the Fireplace ............................................. 6
Clearances ........................................................ 6
Section 3: The Direct Vent System .....................................7 - 8
Section 3-2: Installing a Roof mounted Termination ..... 8
▪ Section 3-2-1: Venting Layout ...................................... 8
▪ Roof mounted Terminations
Standard Top Vent (no elbows or offsets)............. 8
Top Vent (two elbows one offset) ......................... 8
Top Vent (multi-elbows and offsets) ..................... 8
▪ Section 3-2-2: Venting Components ............................. 8
Section 3-3: Installing a Wall mounted Termination ...... 9
▪ Standard PTO Installation ...................................... 9
▪ Pre-installed MSR Frame ...................................... 9
▪ Pre-installed BSR Frame ....................................... 9
▪ Installing MOSR Frame ......................................... 9
▪ Installing VSS Termination Shield ........................... 9
▪ Installing PTKOG Heat Guard ................................ 9
▪ Section 3-3-1: Venting Layout ................................... 10
▪ Top Vent, Wall mounted Graph, L52DF-ST ............ 10
▪ Top Vent, Wall mounted termination (one elbow) .... 10
▪ Top Vent, Wall mounted termination (multi elbow) ... 10
▪ Installing a RHS8 Wall Mounted Heat Shield ......... 11
▪ Installing a RHS101 Wall Mounted Heat Shield ...... 11
Section 4: Wiring ....................................................... 12
▪ Honeywell gas control and pilot ........................... 12
You must read and understand this manual prior to installation, operation or
troubleshooting this appliance. Please retain this owner’s manual for furure reference
and maintenance.
NOTICE
Table of Contents

Page 3
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
INTRODUCTION
Congratulations on your purchase of a Montigo Fireplace.
With over 30 years of experience, Montigo is committed to providing
you with a gas replace that is not only a beautiful addition to your
space, but that is also designed and manufactured to the highest
safety, reliability and engineering standards.
We strongly encourage you to read and carefully follow the
instructions laid out in this Installation, Operation and Maintenance
Manual and retain it for your future reference. Pay special attention
to all cautions, warnings, and notices throughout this manual
intended to ensure your safety.
This manual covers installation, operation and maintenance.
Lighting, operation and care of this replace can be easily
performed by the homeowner. All installation and service work
should be performed by a qualied or licensed installer, plumber
or gastter as certied by the state, province, region or governing
body where the replace is being installed.
Warranty and Installation Information: (See Appendix B)
The Montigo warranty will be voided by, and Montigo disclaims any
responsibility for, the following actions:
► Modication of the replace and/or components including Direct-
Vent assembly or glass doors.
► Use of any component part not manufactured or approved by
Montigo in combination with this Montigo replace system.
► Installation other than as instructed in this manual.
Consult your local Gas Inspection Branch on installation requirements
for factory-built gas replaces. Installation & repairs should be done by
a qualied contractor.
NOTE: L(S)52DF-ST* Units are stainless steel construction
This installation, operation and maintenance manual is applicable
to the models described below. Refer to your rating plate to
verify included options. Throughout this manual instructions
are applicable to all models designated as L52DF-ST* unless
otherwise noted.
L52FSDN X 40,000 X X
L52FSDNE X 40,000 X X
L52FSDL X 40,000 X X
L52FSDLE X 40,000 X X
L52FSDNI X 40,000 X
L52FSDLI X 40,000 X
MODEL Natural Gas Liquid Propane Gas Rating (BTU hr) Linear Burner w/ Glass Accessories Standard Pilot Ignition Honeywell Hot Surface Ignition SIT Electronic Ignition
Indicates a hazardous situation which, if not
avoided, WILL result in death or serious
injury or property damage.
Indicates a hazardous situation which, if not
avoided, COULD result in death or serious
injury or property damage.
Indicates a hazardous situation which, if not
avoided, WILL result in minor or moderate
injury.
Address practices that are important, but
not related to personal injury
DANGER WARNING
CAUTION NOTICE
Safety Alert Key
Introduction
WARNING
Hot glass will cause
burns. Do not touch
glass until unit is cooled.
Never allow children to
touch glass.
Irritant
Cutting
Watch your step
Slippery floor
High temperatures
Glass hazard
Danger of suffocation
High voltage
Toxic
Flammable materials
Corrosive
Fork lift trucks
Danger overhead crane
Explosion risk
Oxidising
Danger of death
Biohazard
Laser Radiation
Danger of entrapment
Hot surface
General Warning
Blank
Gas bottles
Watch for
falling objects
Electricity
Danger for cutter
Entrapment hazard
Battery hazard
Rotating parts
Low temperature
Strong magnetic field
Optical radiation
Non ionizing
radiation
Radiation
Hazardous to the
Environment
Danger of harming
your hands

Page 4
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
Installation Checklist
Determine the desired install location of your replace.
See Section 1, Dimensions on Page 5, and refer to the Framing
Section 2 for details.
Select the location of your termination and resulting vent run.
Your selected termination location must be the highest point
in the Direct Vent installation.
Should it be impossible to meet the venting requirements laid
out in Section 3: Venting, please contact Montigo regarding the
use of a Montigo Power Vent.
Lay out the Vent run; calculating the required elbows and straight
runs of 5"/8" flex or rigid pipe.
Layout Electrical Requirements Refer to Section 4: Wiring, for
Details.
Refer to Section 5: Installing the Gas Line, for details on the
gas connection and access.
Refer to local codes and guidelines for installation requirements.
Installation and repairs should be done by a qualied
contractor and must conform to:
• Installations in Canada must conform to the current
CAN/CGA B-149.1 and .2 Gas Installation Code and local regulations.
• Installations in the USA must conform to local codes,
or in the absence of local codes to the National Fuel Gas Code, ANSI
Z223.1.
• See Appendix C for installation within the State of
Massachusetts. This replace must comply with NFPA-54 Chapter
10.
WARNING!
When this appliance is installed directly on any combustible
material other than wood ooring, it must be installed on a
metal or wood panel extending the full width and depth of
the appliance.
IMPORTANT MESSAGE: SAVE THESE INSTRUCTIONS
The L52DF-ST* Direct Vent replace must be installed
in accordance with these Instructions. Carefully read all the
Instructions in this manual rst. Consult the Local Gas Branch to
determine the need for a permit prior to starting the installation.
It is the responsibility of the installer to ensure this replace is
installed in compliance with the manufacturers instructions and
all applicable codes.
BEFORE YOU START:
INSTALLATION AND REPAIRS SHOULD BE DONE
BY AN AUTHORIZED SERVICE TECHNICIAN. THE
APPLIANCE SHOULD BE INSPECTED BEFORE USE
AND AT LEAST ANNUALLY BY A PROFESSIONAL
SERVICE TECHNICIAN. MORE FREQUENT CLEANING
MAY BE REQUIRED DUE TO EXCESSIVE LINT
FROM CARPETING, BEDDING MATERIAL, ETC. IT
IS IMPERATIVE THAT CONTROL COMPARTMENTS,
BURNERS AND CIRCULATING AIR PASSAGEWAYS
OF THE FIREPLACE ARE KEPT CLEAN.
CAUTION!
Due to its high operating temperatures, the appliance should
be located out of trafc & away from furniture and draperies.
 Children and adults should be alerted to the hazards
of the high surface temperature, which could cause
burns or clothing ignition.
 Young children should be carefully supervised when
they are in the same room as the appliance.
 Clothing or other ammable materials should not be
placed on or near the appliance.
Installation

Page 5
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
Section 1: Installation Overview and Product Dimensions
Figure 1. Fireplace dimensions.
Please review the Installation Checklist on Page 4 for general information on preparing for a successful installation of your replace.
The L52DF-ST* replace may be installed in any location that maintains proper clearances to air conditioning ducts, electrical wiring and plumb-
ing. Safety, as well as efciency of operation, should be considered when selecting the replace location. Try to select a location that does not
interfere with room trafc, has adequate ventilation and offers an accessible path for Direct Vent installation.
The replace dimensions are shown below:
A
BC
D
E
F
Fr
o
n
t
Vi
e
w
B
Side View
G
A
H
KI
J
Top View
Installation
Unit Dimensions
A B C D E F G H I J K
L52DF-ST 52" 33¼" 21⅛" 47" 6⅞" 5¼" 23⅞" 58" 5" 8" 12"

Page 6
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
Section 2: Framing
1). Frame in the enclosure for the unit with framing materials. The
framed opening for the assembled replace is 60" wide, x 39" high
x 23 3/4" deep, see Figure 2 .
NOTE: When constructing the framed opening, please ensure
there is access to install the gas line when the unit is installed.
See Figure 22.
Figure 2. Framing dimensions.
Figure 2a. Framing dimensions, (Back-framing)
Figure 3. Non Combustible Framing with alcove above replace,
Right side. Combustible Framing above replace, Left side, see
gure 2. (Top Vent).
L52DF-ST 30" 1" 0" 4" 1"
MODEL Top - Top Vent Sides Floor Mantel Rear
60”
Both walls Typical.M ay
not be exactly as shown.
60”
23 3/4
”
39”
Non
Combustible
Header
7”
Floor
Alcove over
Fireplace Non
-
Combustible
Materials Only
33 1/4”
door
opening
39”
7”
C
ombustible
Header
Min. 1”
10”
Top vent
N.G. & L.P
Installation
Frame the replace cavity according to Figure 2.
Slide the replace into the cavity. Tack four studs (Vertical) in place
as shown in Figure 2a. Secure the replace in position by nailing into
these cleats. (Minimum 2" clearance must still be maintained around
the vent pipes.)
Clearances
These clearances apply to all dimensions except the framed opening,
where the clearance to combustibles is 0". The L52DF-ST clearance to
unprotected combustible walls which are perpendicular to the replace
opening, must not project beyond the shaded area shown in Fig. 24.
For protection against freezing temperatures, it is recommended that
outer walls of the chase be insulated with a vapor barrier. This will reduce
the possibility of a cold-air convection current on the replace.

Page 7
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
Section 3: Venting
Montigo supplies a variety of direct venting and termination options.
The direct vent termination location MUST be selected such that
it is the highest point in the venting assembly. It should also be
selected such that it provides the shortest vent run possible. Should
it be impossible to ensure that the termination is the highest point or
should it be impossible to meet the venting guidelines laid out below
please contact your Montigo dealer to discuss power venting options.
NOTES FOR PLANNING VENTING:
Venting can terminate through the roof or through an
exterior wall.
 Refer to Appendix A - Termination Locations to ensure the
planned termination location is acceptable.
Once the termination location has been established, refer
to the appropriate section below for installation details
All replaces shipped from the factory are Top vent.
Section 3-2: INSTALLING A ROOF MOUNTED DIRECT VENT
TERMINATION (PVTK-1)
This section applies to installations where the direct vent termi-
nation will be roof mounted.
Section 3-2-1: VENTING LAYOUT
Selection of components and details of venting lay out should
adhere to the following guidelines:
The maximum termination point is 32’ above the replace (NOTE:
if the maximum termination height is used, the ame pattern
may be affected).
The Vertical termination must be a minimum 2’ higher than where
the termination exits the roong materials, (asphault shingles,
cedar shakes, etc). This distance should be measured from the
high side of the roof slope where the ue ashing intersects the
roong materials. (see Figures 11 to 11c *).
Termination location must be a minimum 6’ from a mechanical
air inlet.
Termination location must be a minimum 18” from a parapet wall.
A maximum of two offsets (each offset is made up of 2-90°
bends) may be made.
Install a restop at any location where venting passes through
combustible materials and construction.
Utilize support straps, or support plates, and rings (as required)
to meet acceptable building practices.
Install all roof ashing and storm collars as shown.
Figure 11. Top vent, Roof mounted termination with no offset in
vent run.
Roof mounted Terminations
The following details are some possible congurations for Roof
mounted terminations. See below.
Figure 11a. Top vent, Roof mounted with 1 offset (1 offset= two 90°
bends).
PVTK1 Termination
PVTK1 Termination
Installation

Page 8
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
Figure 11b. Top vent, Roof mounted with 2 offsets (1 offset= two 90°
bends).
Connection and installation of the vent components should
adhere to the following guidelines:
Montigo recommends that all exterior corners and joints be
sealed with exterior caulking however we encourage you to
consult your Building Envelope Engineer or Waterproong
Consultant for further recommendations.
A - Termination PVTK-1
B - Flex Sections PFL - 1 (12" f/f Section)
PFL - 18 (18" f/f Section)
PFL - 2 (24" f/f Section)
PFL - 3 (36" f/f Section)
PFL - 4 (48" f/f Section)
PFL - 6 (72" f/f Section)
C - Rigid Sections PXT - 5 (5" f/f Section)
PXT - 10 (10" f/f Section)
PEXT - 1 (12" f/f Section)
PXT - 20 (20" f/f Section)
PEXT - 2 (24" m/f Section)
PEXT - 3 (36" m/f Section)
PEXT - 4 (48" m/f Section)
PEXT - 6 (72" m/f Section)
D - Support Ring &
Plate
PSPXT-8
E - Firestop PS-8
F - Roof Flashing PRF-7 (1/12 - 7/12 pt.)
PRF-12 (7/12 - 12/12 pt.)
Section 3-2-2: VENTING COMPONENTS
Select from the following components and associated Montigo
part numbers for installation of a Roof Mounted Termination.
Use only Montigo Vent Components. Use of non-Montigo parts
will void the warranty and may impede operation of the replace.
Use any combination of rigid and Flex pipe as required.
Flex sections may be stretched up to 50% of their total length
(e.g. a 24” section maybe stretched to 36”).
Connect all vent sections using a minimum of three sheet metal
screws on the outer pipe ue.
Ensure the pipe ends male to female slide in a minimum of 1
1/2” of overlap.
Ensure all runs are supported with a minimum of 3 supports
per 10’ of venting.
When hanging/ supporting venting, ensure that 1” clearance
is maintained on sides and bottom of vent runs and 2” above
horizontal vent runs to any combustible material.
Ensure when cutting sections of rigid pipe to maintain integrity
of internal supports.
Place the springs, supplied with the pipe kit, between the outer
and inner pipes to keep the pipes separate and avoid any
possible hot spots.
Montigo recommends the use of a ex section for the nal pipe
connected directly to the replace offering greater exibility of
installation and absorption of movement.
When penetrating a combustible ceiling, a ceiling restop must
be used.
PVTK1 Termination
Installation

Page 9
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
1
12”
2”
Section 3-3: INSTALLING A WALL MOUNTED DIRECT VENT
TERMINATION
This section applies to installations where the direct vent termi-
nation will be wall mounted.
1). Installation of Termination with built in frame
A Termination with a Built-In Frame is installed during framing of a structure.
1. Frame the termination opening to 11" x 11".
2. Install exterior sheathing to the structure framing.
3. Fasten the termination to the sheathing using a minimum of 4 screws.
MSR Frame
PTO-4 (5"/8")
Termination
PTO-4F (5"/8")
Termination
Figure 13. Installing a PTO-F termination.
Figure 13a. Installing a PTO termination with the MSR frame.
Figure 14. Installing the VSS Vinyl Shield.
5). Installation of a termination shield for Vinyl Siding
The VSS Termination shield is installed when the exterior of a structure
is clad with Vinyl siding. It is placed directly above, and on-center with
the termination.
2). Installation of termination frame at time of framing
Terminations with a MSR frame allow the installation of the frame prior
to installation of the termination.
1. Frame the termination opening to 12" x 12".
2. Secure the MSR Frame to the exterior sheathing of the structure.
3. Fasten the termination to the MSR Frame using a minimum of 4 screws.
1. Frame the MOSR opening to 12" x 12".
2. Fasten the MOSR frame to the interior side of the studs, concrete,
or nished wall construction using a minimum of 4 screws.
3. Insert the termination into the MOSR frame as shown here, (from
the inside) and attach to the MOSR by installing a min. quantity of
4 bolts into the threaded nuts on the MOSR Frame.
4). Installation of termination from inside structure
A Termination with a MOSR Frame is installed from the inside of the
structure. These are commonly used in high-rise construction.
MOSR Frame
PTO-4 (5"/8")
Termination
Figure 13b. Installing a PTO termination with the MOSR frame.
1
1”
11”
Framing
Exterior
Sheathing
Fastening Hardware,
minimum 4-screws
Framing
Exterior
Sheathing
Fastening Hardware,
minimum 4-screws
12”
12”
Fastening Hardware,
minimum 4-screws
Framing, con-
crete or other
materials
Exterior Sheath-
ing, concrete or
other materials
Exterior Vinyl
siding
PTO-4 (5"/8")
Termination
VSS Vinyl shield
Installation
12”
12”
Figure 13c. Installing a PTO termination with the BSR frame.
3). Installation of termination frame at time of framing in
Masonry
Terminations with a BSR frame allow the installation of the frame in
masonry prior to the installation of the termination
1. Frame the BSR opening to 12" x 12".
2. Secure the BSR Frame to the exterior sheathing of the structure.
3. Fasten the termination to the BSR Frame using a minimum of 4 screws.
BSR Frame
PTO-4 (5"/8")
Termination
Framing
Exterior
Sheathing
Fastening Hardware,
minimum 4-screws

Page 10
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
The Venting Graph: L52DF-ST*
Measure the vertical height from the replace hearth to the centre of the
termination and the horizontal run from the replace ue collar to the wall
ange of the termination. Plot on the Venting Graph Figure 14 with an 'X'.
If the 'X' falls on or above the top boundary of the shaded area, the
installation is acceptable.
Example A: (Unacceptable Installation)
If the vertical dimension from the hearth is 84" and the horizontal
run to the wall ange of the vent termination is 36", this would
NOT be an acceptable installation
Example B: (Acceptable Installation)
If the vertical dimension from the hearth is 108" and the horizontal
run to the wall ange of the vent termination is 120", this would be
an acceptable installation.
Example C: (Unacceptable Installation)
If the vertical dimension from the oor of the replace is 48" and
the horizontal run to the wall ange of the vent termination is 108",
this would NOT be an acceptable installation.
Section 3-3-1: VENTING LAYOUT: Wall mounted termination.
Selection of components and details of venting layout should
adhere to the following guidelines:
Vent terminations must not be recessed in walls or siding.
All through-the–wall terminations within 3’ of the replace must
have a Montigo Heat Shield (RHS101) installed. See Section
3-3-3.
All through-the-wall terminations beyond 3' of the replace must
have a Montigo Heat Shield (RHS8) installed. See Section 3-3-3.
Once the proposed venting layout has been determined refer to
Figure 14 to ensure the layout is acceptable.
Notes Wall Mounted Terminations: Top Vent
All measurements for vertical or horizontal runs are measured
from center of the vent pipe.
Venting runs must fall within the limits set by the venting graph,
see Figure 14.
Wall mounted Terminations
The following details are some possible congurations for Wall
mounted terminations. See below.
PTKOG (5"/8")
1. Ensure that the two long mounting brackets are facing the bottom
of the termination. (See inset). This will provide more heat protection
at the top of the termination, where temperatures are highest.
2. Attach to the faceplate of the termination using four sheet metal
screws.
Figure 13c. Installing a PTO termination heat guard.
Installing Heat Guards over Terminations is recommended
in installations where the termination is located within 7' feet above
grade, or above a pedestrian walkway, and may be Required by code
in Public areas.
1. Ensure that the two long mounting brackets are facing the bottom
of the termination. (See inset). This will provide more heat protection
at the top of the termination, where temperatures are highest.
2. Attach to the faceplate of the termination using four sheet metal
screws.
Installation
WARNING:
An inspection of the explosion relief appers and door
MUST be made prior to lighting the replace. A faulty
seal on the door gasket and/or explosion ports will
result in products of combustion leaking into the living
space and may result in carbon monoxide poisoning.

Page 11
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
B
A
Horizontal Run
(
in.
)
Vertical Height (in.)
84”
126”
C
Figure 14. L52DF-ST* Top Vent Venting Graph for wall mounted
terminations.
If your installation does not fall
within the venting graph para-
meters, please contact Montigo
for Power Venting options.
Figure 16. Top Vented, wall mounted installation with 1 elbow (1 one
90° bend). The vent run must comply with Venting Graph
for Top vent, wall mounted terminations, Figure 14.
Figure 16a. Top Vented, wall mounted Multi-elbow installation. See
Venting Graph for Top vent, wall mounted terminations,
Figure 14.
Unacceptable vent run
within shaded area.
Acceptable vent run
within non-shaded area.
Figure 19c. RHS101 Installation. (Install by sliding Outer Section over vent
pipe where it passes through the combustible construction.
Figure 19d. Heat Shield. After sliding the outer section in place.
Section 3-3-3: Heat Shields
Installing a Wall Mounted RHS101 Heat shield.
The RHS101 Heat shield MUST be used with the L52DF-ST*.
To install the RHS101, Slide the Inner Section over the vent pipe that
will connect to the replace. Then fasten the vent pipe to the back of the
replace with a minimum of three sheet metal screws. (Note: ensure you
maintain the Max. 12" replace clearance). From the outside slide the
RHS101 outer section on see Figure 19c. To complete the installation
fasten the Heat Shield Outer Section & Termination frame to the structure
Figure 19d.
RHS8
84”Min
.
Combustible
framing
Termination
Drywall / sheetrock
RHS101 Heat Shield, inner Section
RHS101 Heat Shield
Outer Section
Vent pipe, from fireplace
Drywall / sheetrock
RHS101 Heat Shield, inner Section
Termination
RHS101 Heat Shield
Outer Section
Installation
RHS8
126” Max
.
84” Min.

Page 12
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
Section 4: Wiring
Wiring Schematic for Honeywell gas control & Pilot
Figure 21. Wiring for the L52DF-ST-E with Honeywell gas control and pilot.
Honeywell (Q3450)
Pilot Assembly
Pilot Electrical
Harness Connector
Honeywell Gas
Control (SV9501M)
Gas Control
Connector
Junction Box
115VAC
24VAC
40 VA
Transformer
Black
White
Green
Gnd Screw
Wall Switch
Fan Plug
Receptacle
Models Included
L52FSDNE
L52FSDLE
Installation
Figure 21a. Wiring for the L52DF-ST-F with SIT IPI Proame gas control and pilot
Wiring Schematic for SIT IPI Models Included
L52FSDNI
L52FSDLI

Page 13
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
Section 5: Installing the Gas line
Section 5-1: FUEL CONVERSION
Verify that your replace is compatible with your available gas
type. (Natural Gas or Propane shown by "N" or "L" in your
model number
If gas type is not compatible, contact your local Montigo
representative to purchase a conversion kit.
Conversion kits must be installed by a qualied service technician.
Section 5-2: GAS PRESSURE
Optimum appliance performance requires proper input pressures.
Gas line sizing requirements will be determined in ANSI Z221.3
National Fuel Gas Code in the USA and CAN/CGA B149 in
Canada.
Pressure requirements are:
Gas Pressure Natural Gas Propane
Minimum inlet pressure 5.5in. w.c. 11in. w.c.
Manifold pressure 3.5in. w.c. 10in. w.c.
Note: After gas line is connected, each appliance connection,
valve and valve train must be checked while under normal
operating pressure with either a liquid solution, or leak
detection device, to locate any source of leak. Tighten any
areas where bubbling appears or leak is detected until
bubbling stops completely or leak is no longer detected.
DO NOT use a ame of any kind to test for leaks.
WARNING!
When pressure testing the replace, Gas line, and input system
follow the appropriate local codes or your area. DO NOT
connect the replace to pressures in excess of 1/2lb. This will
damage the gas control valve.
The manifold outlet pressure is set from the factory to the
appropriate pressure but should be veried.
To check pressures, control valves have a provision to remove
a 1/8” N.PT. plug to be tted with a hose barb.
Montigo requires a service shut off valve be located in an
accessible location to isolate the gas supply.
Only install gas shut-off valves approved for use by the state,
province, or other governing body in which the replace is being
installed.
Section 5-3: GAS CONNECTION
See Figure 22 below for location of gas line access.
Flexible gas connectors must not exceed 3 feet in length, unless
allowable within local regulations.
Connect incoming gas line to the 1/2"or 3/8" gas inlet port.
Purge all air out of gas line.
Check appliance connection, valve and valve train under normal
operating pressure with a commercially available leak check
solution.
DO NOT USE A FLAME OF ANY KIND TO TEST FOR LEAKS.
Figure 22. Gas line access.
Gasline Access
0.875
dia.
6
to center
2 1/2
Installation

Page 14
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
Section 6: Finishing
WARNING!
Do not attempt to clean glass when hot.
Do not clean glass with abrasive materials as any glass etch-
ing may cause premature glass failure.
WARNING!
We recommend careful consideration be given to the effects of
elevated mantel temperatures which may be in excess of product
design, for example: candles, plastic or pictures. This can cause
melting, deformation, discoloration or premature failure of T.V.
radio, and other electronic components.
DO NOT OPERATE THIS FIREPLACE WITHOUT THE GLASS
DOOR OR WITH A BROKEN GLASS DOOR.
CAUTION!
Figure 24. Combustible mantels and facings, (Both Sides Typical).
WARNING!
When covering the upper metal portion of the replace, up to 4"
(as shown, Fig.24) with a non-combustible material Please Note:
The decorative facing materials may be subject to temperatures
in excess of 250° F. This should be considered when selecting
facing materials.
Finishing Around the Fireplace
Combustible mantels and mouldings may be safely installed over the
top and on the front of the replace provided that they do not project
beyond shaded area shown in Figure 24.
Fireplace Facing
When sizing the nish material for your replace, it is important to remem-
ber the following: THE OPENING MUST NOT BE OBSTRUCTED IN ANY
WAY - to do so restricts the air supply for the control compartments
and heat exchanger it also prevents access for servicing controls.
The face of the replace may be painted to match the room decor,
provided you use a heat-resistant paint. Decorative facing must not
extend past the replace opening at all, because it will interfere with
the access to retainers for removal of glass door.
Figure 24a. Installing the Nailing Flange Extension.
Installing the Nailing Flange Extension
Once the replace is placed into the rough framed opening, install the
nailing ange on side, (Part No. L52087) (see Figure 24),
The supplied nailing extension must be placed along the top edge of
the replace and securely fastened in place to the combustible wood
framing. Note: The nailing ange extension can be substituted with
a piece of NON-Combustible material of the same size and thermal
characteristics.
Top of fireplace
Non-Combustible
Combustible Facing
Material
Facing Material
Combustible
Construction allowed
in shaded area
Horizontal Run (in.)
Vertical Height (in.)
Combustible Stud
Installation

Page 15
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
Section 7: Installing & Removing the Door
Removing the door:
The L52DF-ST* doors are removed in a few simple steps. Follow these
below to remove the Horizontal access panel, unlatch the door buckles
and, remove the door. Replace in reverse order.
Remove the Horizontal Access Panel:
Figure 26a. Locate the door buckles. (Three places Typical)
Door Latch Hook
Door Latch Slot
Hand-hold
Release the Door Buckles
Figure 26. Removing and installing the the Horizontal Acess Panel
Locate the Door Buckles:
Figure 26b. Door buckle Tool
1
Step 4:
Firmly grasp hand-hold
end of Door buckle tool
and place the machined
end in the slot under door
frame. (as shown)
Figure 26c.
Step 2:
Step 3:
Step 1:
Remove the Horizontal cover
by placing ngers in both nger
holes, then pushing away from
you and lifting out. Place it
aside during maintenance or
cleaning.
Install in reverse order.
Installed Gas
Valve Cover
Finger Holes
Remove the Horizontal Access Panel:
To install the door, hook the top edge of the door frame into place. Lower
the door into position and follow the previous steps shown in reverse order
Hook the top edge of the door frame into place. Lower and rest the
door frame in place and fasten the buckles. See gures 28a and 28b.
Installing the Door:
2
Step 5:
Ensure the tool is rmly
in the lower end of the
slot, (as shown), Then pull
toward you (Caution: hold
the tool securely).
3
Step 6:
Pull hard if necessary to
release the spring ten-
sion. (Caution: The latch
springs back with force,
hold the tool securely).
4
Step 7:
Remove the tool from
the latch slot. Ensure the
latches are hanging freely,
the hook end is released
from the bottom of the door.
(Repeat all 4-steps for the
remaining latches).
Figure 26d.
Figure 26e.
Figure 26f.
Step 8:
Grasp the Door on either side, usually midway and lift upward, lift
the door carefully up and away from the front of the replace. See
Figures 26g. Place the Door aside in a safe place while maintenance
and / or cleaning is being performed.
Figure 26g. Removing and installing the glass doors. (Both Sides
Typical)
Removing the Door:
Installation

Page 16
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
Section 8: Installing the Accessories
Installing the Firestones or Optional Rocks
Firestone's
The L52DF-ST* is supplied with three bags of Designer Firestone'ss.
Place them randomly across the pan, surrounding the burners as
shown in Figure 27c.
Optional River Rocks
The L52DF-ST* has optional cultured rocks which mimic real stone,
yet designed to withstand a high temperature environments. These
may be spaced at random, or in a visual patter of your preference.
Ensure the rocks or beads do not cover the Burners.
Figure 27c. Installation with glass Firestones .
CAUTION!
When L.P. (Propane) is used DO NOT COVER THE
BURNERS with restones or river rocks.
Installation

Page 17
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
phone. Follow the gas supplier's instructions.
QIf 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 qualied service technician. Force
or attempt to repair may result in a re or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualied service technician to inspect the
appliance and to replace any part of the control system, and
any gas control which has been under water.
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 oor because some gas is
heavier than air and will settle on the oor.
What To Do If You Smell Gas:
QDo not try to light any appliance.
QDo not touch any electrical switch; do not use any phone
in your building.
QImmediately call your gas supplier from a neighbour's
To Turn Off Gas To Appliance:
3. Push in gas control knob slightly and turn clockwise to
"Off". Do not force.
4. Replace the lower Horizontal access panel.
1. Turn off remote switch.
2. Lift out the lower Horizontal access panel.
with Continuous Pilot
with American Flame Electronic Ignition
For Your Safety - READ BEFORE LIGHTING:
WARNING! If you do not follow these instructions exactly, a re or explosion may
result causing property damage, personal injury or loss of life.
Lighting Instructions:
1. STOP! Read the safety information above on this label.
2. Lift out the lower Horizontal access panel.
3. Push in gas control knob and turn clockwise to "OFF."
4. Wait ve (5) minutes to clear out any gas. Smell for gas,
including near the oor. If you then smell gas, STOP! Follow
"B" in the safety information above on this label. If you don't
smell gas, go to the next step.
5. Locate pilot burner (See illustration at right.) and follow steps
below.
6. Turn knob on gas control counter clockwise to "PILOT."
7. Push in gas control knob completely and hold. Light with Piezo
Igniter button. Continue to hold the control knob in for about
(1) minute after the pilot is lit. Release the knob and it will pop
back up. Pilot should remain lit. If it goes out repeat steps 3
through 8.
QIf knob does not pop up when released. Stop and
immediately call your service technician or gas supplier.
QIf the pilot will not stay lit after several tries, turn the gas
control knob to "OFF" and call your service technician
or gas supplier.
8. Push in gas control knob and turn counter-clockwise to
"ON."
9. Replace the lower Horizontal access
panel.
10. Turn on remote switch to ignite re.
NOTE: Gas control knob cannot be turned from "PILOT" to "OFF"
unless knob is pushed in slightly. Do not force.
Section 9: Start-up Sequence Models Included
L52FSDN
L52FSDL
Operation

Page 18
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
For Your Safety - READ BEFORE LIGHTING:
To Turn Off Gas To Appliance:
Lighting Instructions:
QIf 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 qualied service technician.
Force or attempt to repair may result in a re or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualied service technician to inspect
the appliance and to replace any part of the control system,
and any gas control which has been under water.
A. This appliance is equipped with an ignition system that
lights the pilot burner automatically. Do not attempt to
light the pilot by hand.
B. BEFORE LIGHTING smell all around the appliance area for
gas. Be sure to smell next to the oor because some gas
is heavier than air and will settle on the oor.
What To Do If You Smell Gas:
QDo not try to light any appliance.
QDo not touch any electrical switch; do not use any
phone in your building.
QImmediately call your gas supplier from a neighbour's
phone. Follow the gas supplier's instructions.
1. Turn off remote switch.
2. Lift out the lower Horizontal access panel.
3. Turn the switch on the gas control to "Off".
4. Replace the lower Horizontal access panel.
1. STOP! Read the safety information above on this label.
2. Lift out the lower Horizontal access panel.
3. Turn switch on the gas control to OFF".
4. Wait 5 minutes to clear out any gas. If you smell gas,
STOP! Follow "B" in the safety information above on this
label. If you don't smell gas, go to the next step.
5. Turn switch on the gas control to "ON". NOTE: This unit is
equipped with an ignition system that lights the pilot burner
automatically. Do not attempt to light the pilot by hand.
6. Turn on wall switch.
7. Replace the lower Horizontal access panel.
8. If the replace does not operate, follow the instructions "To
Turn Off Gas To Appliance" and call your service technician
or gas supplier.
with Honeywell Electronic Ignition
WARNING! If you do not follow these instructions exactly, a re or explosion may
result causing property damage, personal injury or loss of life.
Operation Models Included
L52FSDNE
L52FSDLE
Gas Control Switch
Shown in ‘ON’ Position
Gas
Inlet

Page 19
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
To Turn Off Gas To Appliance:
1. Turn off remote switch.
2. Remove the lower Horizontal access panel.
3. Turn the incoming gas control valve to "Off".
4. Replace the lower Horizontal access panel.
with American Flame Electronic Ignition
For Your Safety - READ BEFORE LIGHTING:
Proame SIT Electronic Ignition
Lighting Instructions:
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 qualied service technician. Force or at-
tempt to repair may result in a re or explosion.
D. Do not use this appliance if any part has been under
water. Immediately call a qualied service technician to inspect the
appliance and to replace any part of the control system, and any gas
control which has been under water.
A. This appliance is equipped with an ignition system that
lights the pilot burner automatically. Do not attempt to light the pilot by
hand.
B. BEFORE LIGHTING smell all around the appliance
area for gas. Be sure to smell next to the oor because some gas is
heavier than air and will settle on the oor.
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 neighbour's
1. STOP! Read the safety information above on this label.
2. Remove the lower Horizontal access panel.
3. Turn Incoming gas valve to the ON" position.
4. Wait 5 minutes to clear out any gas. If you smell gas, STOP!
Follow "B" in the safety information above on this label. If you
don't smell gas, go to the next step.
5. Turn wall switch "ON".
6. If the Fireplace does not light, the System will cycle through
two trials, (one minute audible clicking, thirty seconds of
silence, and then another one minute of audible clicking).
7. After completion of the information in the Troubleshooting
section, Repeat step 5.
8. If the system will not function correctly, follow the instructions
"To Turn Off Gas To Appliance" and call your service techni-
cian or gas supplier.
EV1 (Pilot
burner)
EV2 (Main
burner)
Pilot Adjust Screw
Lockout Reset Key
Diagnostic Terminal
Power
Command (Wall
switch)
Pilot Sensor
Igniter
Ground
EV1 (Pilot burner)
EV2 (Main burner)
Gas "Out"
Gas "In"
Incoming Gas
Line, Shut-off
Valve
To replace Main
burner
Models
L52DFNI
L52DFLI
If the information in these instructions is not followed exactly, a fire or explosion may
result causing property damage, personal injury or death.
WARNING
Operation

Page 20
L52DF-ST* Indoor Gas Fireplace
Part No. XG0811 -100511
Lighting Instructions
See pages 17 to 19.
CAUTION!
 Fireplace gas control must be in the “OFF” position and pilot
and main burners extinguished when cleaning appliance with
a vacuum.
 Doors can get very hot. Handle only when cool.
General
 Have the replace and installation inspected yearly. The inspection
must include, but is not limited to, the following:
• A visual check of the entire vent system and termination.
• An inspection of the explosion relief appers and the door
gasketing to ensure a proper seal.
• An inspection of the burner, venturi, and primary air openings.
• An inspection of the gas valve, gas components, and pilot ame.
For your convenience a 1/8" manifold pressure tap is supplied
on the gas valve for a test gauge connection.
• Ensure proper log placement as per this manual.
• Inspection of all optional equipment; fans, thermostats, etc.
 For Natural Gas this appliance requires a minimum inlet pressure
of 5.5" W.C. and a manifold pressure of 3.5" W.C.
 For Propane Gas this appliance requires a minimum inlet pressure
of 11" W.C. and a manifold pressure of 10" W.C.
 Always keep the replace area clear and free of combustible materials,
as well as gasoline and other ammable vapors and liquids.
 Do not use this appliance if any part has been under water. Immediately
call a qualied service technician to inspect the appliance and to
replace any part of the control system and any gas control which
has been under water.
Cleaning
When the replace is rst activated, there may be some smoking and
a visible lm may be left on the glass. This is a normal condition, and is
the result of burning of protective coatings on new metal.
 Glass must be cleaned periodically to remove any lm (which is
a normal by-product of combustion) which may be visible. Film
can easily be removed by removing the door, as shown on Page
15. Handle the door carefully, and clean it with non-abrasive glass
cleaners. One of the most effective products is Kel Kem.
 Silicone seals on inner door during initial ring will "off gas", leaving
a visual deposit of a white substance on combustion chamber walls.
This can easily be removed using normal household products.
 Use a vacuum cleaner or whisk broom to keep the control
compartment, burner, and rebox free from dust and lint.
 Logs may be cleaned periodically with a vacuum to remove soot or
other contaminates.
Hi-Lo Burner Adjustment: (SIT Nova 820).
The L52DF-ST* is equipped with an adjustable burner, allowing you to
raise or lower the ames. To adjust the ames, locate the black knob
marked 'Hi-Lo', in the centre of the gas control valve (See Figure 32).
 To raise the ame height, turn the black knob (located behind
the lower trim) counter-clockwise.
 To lower the ame height, turn clockwise.
Figure 32. 'Hi-Lo' Adjustment on the L52DF-ST* s gas valve,
Figure 33. 'Pilot' Adjustment on the L52DF-ST* s gas valve.
Pilot Burner Adjustment: (SIT Nova 820).
1. Locate Pilot Adjustment Screw. (See gure 33.)
2. Adjust pilot screw to
provide properly sized
ame as shown.
Manifold Pressure
Test Connection
Wall Switch
Power
Generator
Pilot Adjustment Screw
Inlet Pressure
'Hi-Lo' Adjustment Knob
Gas Control Knob
(Shown in “Pilot” position)
3. After installing or servicing, leak test with a soap solution with
main burner on. Coat pipe and tubing joints, gasket etc. with soap
solution. Bubbles indicate leaks. Tighten any areas where the
bubbles appear until the bubbling stops completely.
Models Included
L52FSDN
L52FSDL
Maintenance