Montigo M40DV-ST User manual

Installation
Operation &
Maintenance
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.
For Your Safety:
Do not store or use gaso-
line or other ammable
vapors and liquids in
the vicinity of this or any
other appliance.
See-Thru
Gas Fireplace
M40DV-ST
M40DV-ST (MH)
Installer: Leave this manual
with the appliance.
Consumer: Leave this man-
ual for future reference.
Check local codes and read all
instructions prior to installation.
®
CUS
WARNING!
Improper installation, adjustment,
alteration, service or maintenance
can cause injury or property
damage. Refer to this manual. For
assistance oradditionalinformation
consult a qualied installer, service
agency or the gas supplier.
Safety Notice:
Glass doors on gas fireplaces are
extremely hot while the fireplaces 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.

P/N XG0207
Page 2
M40DV-ST See-Thru Gas Fireplace
Warning:
Read this manual before installing, operating or troubleshooting this
appliance. Please retain this owner's manual for future reference.
Congratulations
Congratulations on selecting a Montigo M-Series gas fireplace, an
elagent and well designed gas fireplace built to your specifications.
The Montigo gas fireplace you have selected is designed to provide
the utmost in safety, reliability, and engineering standards.
As the owner of this new fireplace, you'll want to read and carefully
follow all the instructions contained in this Installation, Operations and
Maintenance manual. Pay special attention to all cautions, warnings,
and Important warnings.
This owner's manual should be retained for future reference. We
suggest that you keep it with all your other important documents and
product manuals.
The information contained in this owner's manual, unless noted other-
wise, applies to all models, and gas control systems.
Your new Montigo M-Series gas fireplace will give you years of
durable, reliable use. Welcome to the Montigo family of gas fireplace
products.
Safety Alert Key:
• DANGER! Indicates a hazardous situation which, if not avoided will result in death or serious injury.
• WARNING! Indicates a hazardous situation which, if not avoided could result in death or serious injury.
• CAUTION! Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
• NOTICE: Used to address practices not related to personal injury.
•Important: Used to address practices not related to personal injury.
Congratulations
Safety Alert Key
Introduction............................................................................. 3
Installation
IInstalling the Fireplace Shell ......................................... 4
Installing the Gasline...................................................... 5
The Remote Switch........................................................ 5
Direct Vent Installation ................................................... 6
Terminations ...................................................... 6
Converting to Top Vent or Side Vent model
(Installing the Flue cover) .................................. 7
Rear Vent Venting Requirements ...................... 7
Rear Vent Horizontal Venting Runs ................... 8
Rear Vent Vertical Venting Runs ....................... 9
Top Vent Venting Requirements ...................... 10
Top Vent Horizontal Venting Runs ................... 11
Top Vent Vertical Venting Runs ....................... 12
Reduced Vertical Venting ................................ 13
Table Of Contents
Construction around the fireplace
Facing ............................................................ 13
Mantels and Surrounds ................................... 13
Wiring ............................................................ 14
Removing and Installing the Door ............................... 14
Installing the Logset ..................................................... 15
Installing the Ember Material........................................ 15
Operation........................................................................15 - 18
Model M40DV-ST......................................................... 16
Model M40DV-ST-I....................................................... 17
Model M40DV-ST-F...................................................... 18
Maintenance................................................................... 19 - 20
Warranty................................................................................. 21
Appendix
A. Termination Locations.............................................. 22
B. Mobile Home Approved Models............................... 23
C. State of Massachusetts / Amendment..................... 24
Notes ......................................................................... 25

Page 3
P/N XG0207
M40DV-ST See-Thru Gas Fireplace
Introduction
The M40DV-ST is a direct-vented, 2-sided Gas Fireplace with an
adjustable burner. It can be converted to both a top vent or side vent
unit, and it is available in two models:
Model M40DV-ST (continuous pilot)
Model M40DV-ST-I (intermittent pilot)
Model M40DV-ST-F (SIT Electronic)
Model M40DV-ST-MH (mobile home)
For Mobile Home Approved Models See Appendix B
This manual covers installation, operation and maintenance. Light-
ing, operation and care of this fireplace can be easily performed by
the homeowner. However, all installation and service work should be
performed by a qualified or licensed installer, plumber, or gasfitter
who is qualified or licensed by the state, province, region, or govern-
ing body in which the appliance is being installed.
This manual covers both models and unless otherwise specified, the
designation M40DV-ST refers to both models. Sections which are
specific to a particular model are marked with a symbol,
plus the appropriate model number.
The M40DV-ST is rated for:
Natural Gas at 30,000 BTU/H (8.79 Kilowatts) max. input, and
24,000 BTU/H (7.03 Kilowatts) min. input.
Propane at 30,000 BTU/H (8.79 Kilowatts) max. input, and
24,000 BTU/H (7.03 Kilowatts) min. input.
The Montigo warranty will be voided by, and Montigo disclaims any
responsibility for, the following actions:
Modification of the fireplace 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 fireplace system.
Installation other than as instructed in this manual.
Consult your local Gas Inspection Branch on installation require-
ments for factory-built gas fireplaces. Installation & repairs should be
done by a qualified contractor.
Installations in Canada must conform to the current CAN/CGA
B-149.1 and .2 Gas Installation Code and local regulations. This fire-
place's fans must be electrically grounded in accordance with CSA
C22.1 Canadian Electrical Code Part 1 and/or Local Codes.
Installations in the USA must conform to local codes, or in the ab-
sense of local codes to the National Fuel Gas Code, ANSI Z223.1-
1988. The fans must be grounded in accordance with local codes
or, in the absence of local codes, with the National Electrical Code,
ANSI/NFPA 70-1987. See Appendix C for replace installations
within the State of Massachusetts.
CAUTION!
Due to its high operating temperatures, the appliance
should be located out of traffic & 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 flammable materials should not be
placed on or near the appliance.

P/N XG0207
Page 4
M40DV-ST See-Thru Gas Fireplace
Installation
Installing The Fireplace Shell
The fireplace may be installed in any location that maintains clear-
ances to air conditioning ducts, electrical wiring and plumbing. Safety,
as well as efficiency of operation, must be considered when selecting
the fireplace location. Try to select a location that does not interfere
with room traffic, has adequate ventilation, and offers an accessible
pathway for Direct Vent installation.
The fireplace dimensions are shown below:
Figure 1. Fireplace dimensions.
Framing
Unprotected combustible walls which are perpendicular to the
fireplace opening, must not project beyond the shaded area shown in
Figure 20b.
For protection against freezing temperatures, it is recommended that
outer walls of the chase be insulated with a vapour barrier. This will
Figure 2a. Framing dimensions for the rough opening.
Clearances
The M40DV-ST clearances to combustible materials are:
Top* 8"
Ends 1½"
Floor Combustible
Mantle** 6"
Flue Cover 1 1/2"
* Clearance from the top of the fireplace to
a combustible ceiling within the fireplace
enclosure.
** Refer to page12.
Figure 2b. Back-framing to nish enclosing the replace can be
constructed on either the left or right side.
End View Top View
Front View
Figure2c.FlueCoverclearancestocombustibleswheninstallingthe
unit in a top vent conguration.
WARNING!
When this appliance is installed directly on carpeting, tile or any
combustible material other than wood flooring, it must be installed
on a metal or wood panel extending the full width and depth of
the appliance.

Page 5
P/N XG0207
M40DV-ST See-Thru Gas Fireplace
Installing The Gas Line
The gas line must be installed before finishing the M40DV-ST fire-
place. Natural Gas requires a minimum inlet gas supply pressure of
5.5" W.C. & a manifold pressure of 3.5" W.C. Propane Gas requires a
minimum inlet gas supply pressure of 11" W.C. & a manifold pressure
of 10" W.C. Provision must also be made for a 1/8" N.P.T. plugged
tapping and be accessible for test gauge connection immediately up-
stream of the gas supply controls to the appliance. The fireplace gas
connection and the main operating gas valve are located behind the
removable trim at the bottom of the unit and need only be attached
to the gas line with an approved fitting, as required by the applicable
installation codes.
• Only use gas shut-o valves approved for use by the state, province,
region, or governing body, in which the appliance is being installed, or
as required by the applicable installation codes.
• Flexible gas connectors must not exceed 3 feet in length, unless it is
allowable within applicable installation codes.
* 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 detec-
tion 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.
Installing The Remote Switch
The M40DV-ST is equipped with a remote-operated valve for use with
a wall switch. See Figure 19 for information on wiring the switch. The
valve is pre-wired and generates its own power. DO NOT connect
any external power to it.
Note: The switch location must not exceed 30' from the fireplace.
Figure 3. Gas line access.
The appliance and its individual shutoff valve must be disconnected
from the gas supply piping system during any pressure testing of that
system at test pressures in excess of 1/2 psig (3.5 kPa).
The appliance must be isolated from the gas supply piping system by
closing its individual manual shutoff valve during any pressure testing
of the gas supply piping system at test pressures equal to or less than
1/2 psig (3.5 kPa).
Installation
Vent Installation
This section covers the installation of direct venting and terminations.
For a detailed diagram of allowed termination locations, see Appen-
dix A.
Installation Requirements
The M40DV-ST fireplace uses Premium venting components with:
5" inner dia. /8" outer dia.
Minimum clearance to combustible construction around the
vent pipe is 1" on all sides, except on horizontal venting where
the top of the pipe must have a clearance of at least 2".
Useonly certiedMontigoventcomponents.(Useofotherparts
will void the Montigo warranty, and may impede the operation of
the fireplace.)
All joints must be secured with a minimum of two screws per joint
Vent terminations must not be recessed in walls or siding
Horizontal runs must be supported by a minimum of two supports
per horizontal run. A minimum of one screw on each side of sup-
port is also required
Flex vent sections may be stretched up to 50% of their total length
(eg. a 24" section may be stretched to 36")
Maximum horizontal run for a flex section with no vertical rise is 3
feet.
Flex vent sections over 3 feet must fall within the limits set by the
venting graph and must have a minimum vertical rise of 3 inches
per foot of flex.
Venting components can be used in any combination of solid/rigid
Solid vent sections may be cut less than half way from the tapered
end
Cautions:
Vent terminations can be very hot. If the termination is less than
7 feet above a public walkway, it should be fitted with a certified
Montigo Heat Guard. (Part no. PTKOG)
Do not obstruct, or attempt to conceal, the vent termination.
These actions will affect the operation of the fireplace, and may
be hazardous.
In heavy snow areas, take extra care to prevent snow buildup
from obstructing the vent termination.