Montigo MW38-BV User manual

Page 1 of 13
MW38-BV Modular Fireplace
XG0310 Rev. 01 - 11/98
Check local codes and
read all instructions
prior to installation.
Leavethismanualwith
the owner.
Modular
Gas Fireplace
MW38-BV
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.
• If you cannot reach your gas supplier, call the fire department.
Warning:
Improper installation, adjustment,
alteration,serviceormaintenancecancause
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.

Page 2 of 13
MW38-BV Modular Fireplace
XG0310 Rev. 01 - 11/98
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.
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
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.

Page 3 of 13
MW38-BV Modular Fireplace
XG0310 Rev. 01 - 11/98
Installing The Fireplace Shell
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:
Installation
14 ¾
38
33
CØ4" B-Vent
8 ½
Top View
Front View Side View
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.
14 ¾
33 ½
41
35
38
28 ¾
35
14 ½
4 ¾
4 ¾
Figure 1. Fireplace dimensions.
Figure 2. Framing dimensions.
* When sheetrock is
not used behind the
fireplace, framing
depth may be
reduced to 14 3/4"
37 3/4
15 1/2
41 1/4
43 7/8
24 1/8
0" clearance
to corners only
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.)
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.
Figure 3. Corner framing dimensions.
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.
Framing

Page 4 of 13
MW38-BV Modular Fireplace
XG0310 Rev. 01 - 11/98
Installing The Gas Line
The gas line must be installed before finishing the MW38-BV 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
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.
Installation
Note: After gas line is connected, each applianceconnection,
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.
Figure 5. Gas line access.
2 1/2
Gasline access
6 x 2 1/2"
1
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).
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.
•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.
CAUTION:

Page 5 of 13
MW38-BV Modular Fireplace
XG0310 Rev. 01 - 11/98
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.
Installation
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
3
45
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.
Top of fireplace
Combustible Facing
Combustible construction
allowed in shaded area.
123456789101112
Figure 6b. Combustible surrounds.
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.

Page 6 of 13
MW38-BV Modular Fireplace
XG0310 Rev. 01 - 11/98
Installation
Wiring
Figure 8b. Wiring schematic for optional fan kit.
Figure 8a. Wiring for optional air circulating fan kit.
G
L1-WH
L2-BLK
Quick Connect
plug to motor
Installing the Log Set
The MW38-BV is supplied with four (4) soft fibre logs. Logs "A" and
"B" are permanently attached to a fibre base, which is pre-installed by
the factory. To install the two small logs ("C" and "D"), simply place
them onto their mating positions as shown in figure 9a below. When
log set is installed it should look like figure 9b.
Figure 9a. Log placement.
Figure 9b. Completed log installation.
Log 'C'
Logs 'A' and 'B'
Log 'D'
NOTES:
If logs are not placed properly, excessive sooting will result.
If handling or vacuuming the logs, do not attempt to move
the two large logs. They are extremely fragile, and will break
easily.
The surface of the logs will crack due to the heat from the
flames. This is a normal occurance.
Gas Control and Pilot Wiring MW38-BV-I
Honeywell (Q3450)
Pilot Assembly
Pilot Electrical
Harness Connector
Honeywell Gas
Control (SV9501M)
Gas Control
Connector Fuse
Limit
Switch Wall
Switch
Fan Plug
Receptacle
Junction Box
Junction Box Cover
White
Black
Green
40 VA
Transformer
115VAC
24VAC
Grnd Screw
Figure 7. Wiring for the MW38-BV-I with Honeywell gas control and
pilot.
Wiring for the optional Fan Kit
All 38 Series Modular fireplaces may be equipped with optional fan or
blower kits for circulating heat into the living space.
Installations in Canada which employ the fans must be electrically
grounded in accordance with CSA C22.1 Canadian Electrical Code
Part 1 and/or Local Codes.
Installations in the USA which employ 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.
For more information see the Fan Kit Installation Guide included
with the fan kit.
NOTE: If any of the original wire supplied with the appliance is replaced, it
must be replaced with the same type, or its equivalent.
115/1/60 Supply
G L1 L2

Page 7 of 13
MW38-BV Modular Fireplace
XG0310 Rev. 01 - 11/98
Removing and Installing
the Door
Removing the door surround:
The door surround is held in place by two metal clips at the top, and
one magnet on each side. To remove the surround, pull the bottom
outwards and lift upwards until the slots "A" are clear of tabs "B" in
the door. You may need to use a flat screwdriver to pull the door
surround outwards. (See figure 11a).
Installation
Removing and Installing
the Insert
You may remove the insert to protect it from theft and damage
during construction.
1. Remove the two machine screws (1 left & 1 right) at the top of the
insert that attach the insert to the shell. See figure 10, inset 1.
2. Remove the 4 machine screws that hold the venting plate to the
insert. For easier access, you may remove the effiiciency baffles
to gain access to the venting plate.
3. Remove the insert by tipping the top of the insert outward and
lifting the tabs past the slots in the bottom of the shell. See figure
10, inset 2.
Store the screws and clamps in a safe place to ensure that they are
not lost.
To re-install the insert simply reverse the steps above. Remember
to re-install the efficiency baffles if they were removed.
Removing the door:
Remove the machine screws along the top of the door, and then pull
the door outwards and upwards until it is clear of the door rail. (See
figure 11b). Ensure that a good seal is maintained when installing the
door.
Figure 10. MW38-BV insert.
INSET 1
Tab
INSET 2
Mounting
Bracket
Figure 11a. Removing or installing the door surround.
Glass door
and frame
Door surround
Tab 'B'
Slot 'A'
Magnet
Pull bottom of door
surround outwards
and upwards.
Glass door
& frame
Figure 11b. Removing or installing the glass door.
Venting Plate
Front
Slot

Page 8 of 13
MW38-BV Modular Fireplace
XG0310 Rev. 01 - 11/98
WARNING: If you do not follow these instructions exactly, a fire or explosion
may result causing property damage, personal injury or loss of life.
If you cannot reach your gas supplier, call the Fire
Department.
C. Use only your hand to push in or turn the gas control knob.
Never use tools. If the knob will not push in or turn by
hand, don't try to repair it, call a qualified service technician.
Force or attempt to 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.
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 electrical switch; do not use any
phone in your building.
Immediately call your gas supplier from a neighbour's
phone. Follow the gas supplier's instructions.
To Turn Off Gas To Appliance:
Operation - Model MW38-BV
3. Push in gas control knob slightly and turn clockwise
to "Off". Do not force.
4. Flip up lower brass trim.
1. Turn off remote switch.
2. Flip down lower brass trim.
1. STOP! Read the safety information above on this label.
2. Flip down lower brass trims.
3. Push in gas control knob and turn clockwise to
"OFF."
4. Wait five (5) minutes to clear out any gas. Smell for gas,
including near the floor. 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 counterclockwise 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.
If knob does not pop up when released. Stop and
immediately call your service technician or gas supplier.
If 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 counterclockwise to "ON."
9. Flip up lower brass trim.
10.Turn on remote switch to ignite fire.
Lighting Instructions:
MW38-BV
with Continuous Pilot
For Your Safety - READ BEFORE LIGHTING:
Gas Control Knob
(Shown in "Pilot" postion.)
NOTE: Knob cannot be turned from
"PILOT" to "OFF" unless knob is
pushed in slightly. Do not force.

Page 9 of 13
MW38-BV Modular Fireplace
XG0310 Rev. 01 - 11/98
For Your Safety - READ BEFORE LIGHTING:
To Turn Off Gas To Appliance:
Lighting Instructions:
If you cannot reach your gas supplier, call the Fire
Department.
C. Use only your hand to push in or turn the gas control knob.
Never use tools. If the knob will not push in or turn by
hand, don't try to repair it, call a qualified service
technician. Force or attempt to 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.
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 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 electrical switch; do not use any
phone in your building.
Immediately call your gas supplier from a neighbour's
phone. Follow the gas supplier's instructions.
1. Turn off remote switch.
2. Flip down lower brass trim.
3. Turn the switch on the gas control to "Off".
4. Flip up brass trim.
1. STOP! Read the safety information above on this label.
2. Flip down lower brass trims.
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. Flip up lower brass trim.
8. If the fireplace does not operate, follow the instructions "To
Turn Off Gas To Appliance" and call your service technician
or gas supplier.
with Honeywell Intermittent Pilot
WARNING: If you do not follow these instructions exactly, a fire or explosion
may result causing property damage, personal injury or loss of life.
Operation - Model MW38-BV-I
MW38-BV-I
Gas
Inlet
Gas Control Switch
Shown in "On" Position

Page 10 of 13
MW38-BV Modular Fireplace
XG0310 Rev. 01 - 11/98
Maintenance
WARNING:
Do not attempt to clean glass when hot.
Do not clean glass with abrasive materials as any glass
etching may cause premature glass failure.
CAUTIONS
Fireplace gas control must be in the “OFF” position and pilot
and main burners extinguished when cleaning appliance with
a vacuum.
Doors and logs can get very hot. Handle only when cool.
General
Have the fireplace installation inspected yearly, including a visual
check of the vent system, the burner and the pilot flame. For your
convenience a 1/8" manifold pressure tap is supplied on the gas
valve for a test gauge connection. See Figure 13.
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 fireplace area clear and free of combustible
materials, as well as gasoline and other flammable vapours and
liquids.
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.
Operation
Lighting Instructions
See pages 8 and 9.
Burner Adjustment
The Wildfire is equipped with an adjustable burner, allowing you to
raise or lower the flames. To adjust the flames, locate the black knob
marked 'Hi-Lo', in the centre of the gas control valve (See Figure 12).
To raise the flame height, turn the black knob (located behind
the lower trim) counterclockwise.
To lower the flame height, turn clockwise.
Gas Control Knob
(Shown in "Pilot" postion.)
'Hi-Lo' Adjustment Knob
Figure 12. 'Hi-Lo' Adjustment on Model MW38-BV gas valve. Cleaning
When the fireplace is first activated, there may be some smoking and
a visible film 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 film (which is a
normal biproduct of combustion) which may be visible. Film can
easily be removed by removing the door, as shown on page 7.
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 firing 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 firebox free from dust and lint.
Logs may be cleaned periodically with a vacuum to remove soot
or other contaminates.