Montigo MW38 BV User Manual
MW38-BV Modular Fireplace
Installation
Operation &
Maintenance
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 the gas supplier.
For Your Safety:
Do not store or use gasoline
or other flammable vapors
and liquids in the vicinity of
this or any other appliance.
MW38-BV
Modular
Gas Fireplace
Check local codes and
read all instructions
prior to installation.
Leave this manual with
the owner.
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.
XG0310 Rev. 01 - 11/98
Page 1 of 13
MW38-BV Modular Fireplace
Table Of Contents
Introduction ............................................................................. 2
Installation
Installing the Fireplace Shell ......................................... 3
Installing the Gasline ..................................................... 4
The Remote Switch ....................................................... 4
B-Vent Installation ......................................................... 4
General Requirements...................................... 4
Terminations .....................................................5
Top Vent Models with horizontal runs ............... 6
Top Vent Models with vertical runs ................... 8
Rear Vent Models ............................................. 9
Construction around the fireplace
Facing ............................................................. 10
Mantels and Surrounds................................... 10
Wiring ....................................................................... 11
Installing the Logset .................................................... 11
Removing and Installing the Insert .............................. 12
Removing and Installing the Door ............................... 12
Operation ........................................................................ 13 - 15
Maintenance ................................................................... 15 - 16
Warranty ................................................................................. 17
Appendix
A. Spare Parts ............................................................. 18
B. Termination Locations ............................................ 19
Introduction
About the Wildfire 38:
The MW38-BV is a B-vented gas fireplace equipped with a dual-inlet
Wildfire® Burner. It is available in two versions:
MW38-BV -- Continuous Pilot Ignition
MW38-BV-I -- Intermittent Pilot
The MW38-BV is rated for Natural Gas or Propane at 29,000 BTU/H
(8.5 Kilowatts) Input.
How to use this manual:
This manual covers all models and unless otherwise specified, the
designation MW38-BV refers to all models. Sections which are
specific to a particular model are marked with a symbol,
plus the appropriate model number.
Warranty and Installation Information:
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
requirements 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. If the
optional air-circulating fan kit is installed, it 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
absense of local codes to the National Fuel Gas Code, ANSI Z223.1-
1988. If the optional air-circulating fan is installed, it must be
grounded in accordance with local codes or, in the absence of local
codes, with the National Electrical Code, ANSI/NFPA 70-1987.
Page 2 of 13
CAUTIONS
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.
XG0310 Rev. 01 - 11/98
Installation
Installing The Fireplace Shell
MW38-BV Modular Fireplace
The fireplace may be installed in any location that is free of 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 Vent and Combustion Air installation. Refer to page 4 -
Vent Installation for more information.
The fireplace dimensions are shown below:
33
8 ½
C
Ø4" B-Vent
38
14 ¾
Top View
14 ¾
28 ¾
4 ¾
14 ½
4 ¾
35
35
41
33 ½
Unprotected combustible walls which are perpendicular to the
fireplace opening, must not project beyond the shaded area shown in
Figure 19b.
For protection against freezing temperatures, it is recommended that
outer walls of the chase be insulated with a vapour barrier. This will
reduce the possibility of a cold-air convection current on the fireplace.
Framing
* When sheetrock is
not used behind the
fireplace, framing
depth may be
reduced to 14 3/4"
15 1/2
37 3/4
Figure 2. Framing dimensions.
41 1/4
0" clearance
to corners only
38
Front View
Side View
Figure 1. Fireplace dimensions.
Clearances
The MW38-BV clearances to combustible materials are:
Top* 16"
Back 0"
Side 1 1/2"
Floor 0"
Mantle** 9"
B-Vent*** See Notes
* Clearance from the top of the fireplace to a
combustible ceiling within the fireplace
enclosure.
** Refer to page 5.
*** This model requires 2" clearance around the
B-Vent within the fireplace enclosure. Past the
enclosure, use standard clearance as specified
by the manufacturer of the B-Vent.
24 1/8
43 7/8
Figure 3. Corner framing dimensions.
Installing a Shelf Over the Fireplace
When installing a shelf over the top of the fireplace, the minimum
allowable clearance from the top of the fireplace to a shelf is
16".(Proper clearance must be maintained around the vent pipes, as
specified by the B-Vent manufacturer.)
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.
XG0310 Rev. 01 - 11/98
Page 3 of 13
MW38-BV Modular Fireplace
Installation
Installing The Gas Line
The gas line must be installed before finishing the MW38-BV Fireplace. 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
upstream of the gas supply controls to the appliance. The fireplace
gas connection and the main operating gas valve is located behind
the removable brass 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.
1
Gasline access
2 1/2
Figure 5. 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).
6 x 2 1/2"
B-Vent Installation
The MW38-BV is certified for use with standard 4" B-Vent and
requires no B-Vent appliance connector. Simply attach the B-Vent to
the fireplace flue collar, and secure it using 1/4" sheet metal screws.
Do not penetrate the inner sleave of the B-Vent when tightening the
screws.
Refer to the current CAN/CGA B-149.1 and .2 or ANSI Z223.1-1988
Gas Installation Code for specific vent sizing.
CAUTION:
• Test your B-Vent installation after completion to ensure that
no combustible by-products are spilling from the fireplace
opening. This draft test should be performed after a three(3)
minute warm up period. The manufacturer will not be
responsible for any installations with inadequate draw.
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 flame of any kind to test for leaks.
Installing The Remote Switch
The MW38-BV's gas valve, located behind the lower brass trim, may
be connected to a wall switch. The valve generates its own power on
a millivolt circuit. Use only low voltage wire, and DO NOT connect
any external power to it.
Refer to Figure 26 for wiring requirements.
Note: The switch location must not exceed 30' from the fireplace.
Page 4 of 13
XG0310 Rev. 01 - 11/98
Installation
Finishing Around the Fireplace
Combustible mantels and mouldings may be safely installed over the
top and on the front of the fireplace provided that they do not project
beyond shaded area shown in Figure 6a. Side wall clearances are 3".
Combustible surrounds may be installed with 3" clearance to the side
of the fireplace as shown in Figure 6b.
Fireplace Facing
When selecting the finish material for your fireplace, it is important to
remember the following: BRASS TRIMS 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 fireplace may be painted to match the room decor,
provided you use a heat-resistant paint. Decorative facing must not
extend past the fireplace opening at all, because it will interfere with
the access to retainers for removal of glass door.
MW38-BV Modular Fireplace
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. and
radio components.
Sheetrock/
Drywall
Header
45
3
Combustible construction
allowed in shaded area.
Combustible Facing
Top of fireplace
123456789101112
Figure 6a. Combustible mantles and facings.
Mantels & Surrounds
NOTE: National Canadian Gas Association mantel test requirements
are for fire hazard prevention to combustible materials.
New technology, to meet consumer and government demands for the
wise use of energy, has prompted us to manufacture many models of
fireplaces which are hot, fuel and energy efficient.
Please be aware; temperatures over the mantel will rise above
normal room temperature and walls above fireplace may be hot to
touch.
Figure 6b. Combustible surrounds.
Painting:
Special care is recommended by the Master Painters and Decorators
Association, when painting the fireplace surrounds, to select and
apply a quality Alkyd sealer prior to the applying of latex paints. This
is to prevent leaching of water from evaporation and causing a
brownish staining effect to paint over coats.
XG0310 Rev. 01 - 11/98
Page 5 of 13
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