Montigo MW38 DV User Manual
MW38-DV 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-DV
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.
P/N XG0112
Page 1 of 19
MW38-DV Modular Fireplace
Table Of Contents
Introduction ............................................................................. 2
Installation
Installing the Fireplace Shell ......................................... 3
Installing the Gasline ..................................................... 4
The Remote Switch ....................................................... 4
Direct 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 ................................................................ 10 - 11
Installing the Logset .................................................... 11
Removing and Installing the Insert .............................. 11
Removing and Installing the Door ............................... 12
Operation ........................................................................ 13 - 14
Maintenance ................................................................... 15 - 16
Warranty ................................................................................. 17
Appendix
A. Spare Parts ............................................................. 18
B. Termination Locations ............................................ 19
Introduction
About the Wildfire 38:
The MW38-DV is a direct-vented gas fireplace equipped with a dual-
inlet Wildfire® Burner. It is available in four models:
Top Vent (Product Code MW38-DT)
Rear Vent (Product Code MW38-DR)
Intermittent Pilot - Top Vent (Product Code MW38-DT-I)
Intermittent Pilot - Rear Vent (Product Code MW38-DR-I)
The MW38-DV is rated for Natural Gas at 29,000 BTU/H (8.5
Kilowatts) Input 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-DV 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 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.
P/N XG0112
Installation
4
Installing The Fireplace Shell
MW38-DV 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 Direct Vent installation. Refer to page 4 - Vent Installation
for more information.
The fireplace dimensions are shown below:
33
5 1/2
Ø4
38
C
Ø7
14 3/4
Top Vent
14 3/4
Rear Vent
Ø7
Ø4
28 3/
4 3/4
14 1/2
4 3/4
28 3/4
38
Front View
34 3/4
34 3/4
Figure 1. Fireplace dimensions.
Clearances
These clearances apply to all dimensions except the framed opening,
where the clearance to combustibles is 0". The MW38-DV clearances
to combustible materials are:
Top - Rear Vent* 7 1/4"
Top - Top Vent*
Back 0"
Side 1½"
Floor 0"
Mantle** 12"
* Clearance from the top of the fireplace to a
combustible ceiling within the fireplace enclosure.
** Refer to page 10.
† If special short elbow (SEL90) is used with the Low
Clearance Sleeve (CRS30) the Top Clearance is 13".
If the standard elbow (MEL90) is used with the Low
Clearance Sleeve (CRS30) the Top Clearance is 15".
If the Low Clearance Sleeve (CRS30) is NOT used
over the elbow, the Top Clearance is 35".
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.
P/N XG0112
†
13"
Framing
* When sheetrock is
not used behind the
fireplace, framing
40 3/4
15 1/2
37 3/4
Figure 2. Framing dimensions.
0" clearance
to corners only
24 1/8
43 7/8
Figure 3. Corner framing dimensions.
When installing a shelf over the top of the fireplace, the following
guidelines must be adhered to: For Rear Vent models (MW38DR),
the minimum clearance from the top of the fireplace to a shelf is 7 ¼".
For Top Vent models (MW38DT), the minimum clearance is 13".
(Minimum 1" clearance must still be maintained around the vent
pipes.)
Figure 4. Framing for shelves over the fireplace.
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.
depth may be
reduced to 14 3/4"
Top VentRear Vent
Page 3 of 19
MW38-DV Modular Fireplace
Installation
Installing The Gas Line
The gas line must be installed before finishing the MW38-DV 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"
Vent Installation
This section covers the installation of direct venting and terminations.
Installation Requirements
MW38-DV fireplaces must be installed with Montigo Standard
Series direct vent components with:
4" inner dia. / 7" outer dia.
Minimum 1" clearance to combustibles required for vent pipes
Use only certified Montigo vent components. (Use of other parts
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
support 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 is 3 feet.
Solid vent sections may be cut less than half way from the
tapered end
Vent Terminations
Selecting A Termination Location
Choosing your vent termination location will help to determine
whether you need to use a top vent or rear vent fireplace. Figure 6,
below, shows typical fireplace locations and the venting options they
provide.
For a more detailed diagram of allowed termination locations, see
Appendix B.
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-DV'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 19
Figure 6. Fireplace locations and vent terminations.
Cautions:Cautions:
Cautions:
Cautions: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. MTKOG)
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.
P/N XG0112
Installation
MW38-DV Modular Fireplace
Installing Terminations with Built-In Frames
11
MTO-3F
11
1. Frame the termination opening to 11" x 11".
2. Fasten the termination to the studs using a minimum of 4
screws.
Installing Terminations with MSR or BSR Frames
The MSR Frame is for use with stucco or siding exteriors, and the
BSR is for use with brick exteriors. The BSR is available in 4" or 6"
depths.
12
12
MSR shown
Inset - BSR frame.
termination may not be easily installed from the building's exterior.
1. Frame the termination opening to 12" x 12".
2. Fasten the MOSR frame to the interior side of the studs using a
minimum of 4 screws.
3. Insert the termination into the MOSR frame as shown here, and
attach by screwing through the four pilot holes in the termination.
Installing Heat Guards over Terminations
MTKOG
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.
MTO-3
1. For the MSR, frame the termination opening to 12" x 12".
For the BSR, frame the termination opening to 11" x 11".
2. Fasten the MSR or BSR to the studs using a minimum of 4 screws.
3. Attach the termination to the frame as shown here, and secure by
screwing through the four pilot holes in the termination.
Installing Terminations with MOSR Frames
The MOSR is a frame for installing terminations from the interior of a
building. Use it for installations such as high rises, where the
MOSR
MTO-3
1212
12
P/N XG0112
Page 5 of 19
MW38-DV Modular Fireplace
Installation
Top Vent Venting Runs
Before you install any venting, you must determine whether the
venting run will be acceptable. Unacceptable venting can affect the
fireplace's combustion.
The Venting Graph
Measure the vertical height from the fireplace hearth to the centre of
the termination and the horizontal run from the from the fireplace flue
collar to the wall flange of the termination. Plot on the Venting Graph
(Fig. 9) with an 'X'.
If the 'X' falls on or above the top boundary of the shaded area, the
installation is acceptable.
Example A: (Acceptable Installation)
If the vertical dimension from the hearth is 84" and
the horizontal run to the wall flange of the vent
termination is 36", this would be an acceptable
installation.
Example B: (Acceptable Installation)
If the vertical dimension from the hearth is 90" and
the horizontal run to the wall flange of the vent
termination is 120", this would be an acceptable
installation.
Example C: (Unacceptable Installation)
If the vertical dimension from the floor of the fireplace
is 72" and the horizontal run to the wall flange of the
vent termination is 84", this would NOT be an
acceptable installation.
108
96
84
72
60
48
36
24
12
0
0 12 24 36 48 60 72 84 96 108 132120 144 156 168 180
Hearth
Figure 7. Venting Graph
Horizontal Run (in.)
Top Vent
Heat Shields
Due to high flue temperatures, heat shields are required on all 38
Series Modular Direct Vent installations (except those with vertical
terminations) at the point where the
venting connects to the termination.
With the heat shield, vent
clearances can be maintained at
1".
Figure 8. Heat Shield. Install by sliding over the vent pipe where it
passes through combustible construction.
Installation Of Top Vent DV
The following venting components are available for the MW38-DV
Top Vent:
A - Termination MTO-3 (3" length)
MTO-3F (3" length)
B - Stucco Kits MSR (stucco frame)
MOSR (stucco can)
BSR (brick can)
C - Solid section & elbow MIHR-6 (72" length)
MIHR-10 (120" length)
D - Flex sections MFL-1 (12" section)
MFL-18 (18" section)
MFL-2 (24" section)
MFL-3 (36" section)
MFL-4 (48" section)
E - Solid sections EXT-18 (18" f/f section)
MEXT-1 (12" m/f section)
MEXT-2 (24" m/f section)
MEXT-3 (36" m/f section)
MEXT-4 (48" m/f section)
MEXT-6 (72" m/f section)
F - Elbows
MEL-90M (m/m 90° elbow)
MEL-90F (f/f 90° elbow)
MEL-90FM (f/m 90° elbow)
EEL-45 (f/m 45° elbow)
Page 6 of 19
NOTES: All dimension lengths 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 7).
P/N XG0112
MW38-DV Modular Fireplace
Installation
Example 1:
For our shortest venting configuration use components A and F (see
Figure 9a). This configuration is suitable for installations where the
fireplace backs directly against 4" stud wall. For deeper walls, use an
MEL-90FM elbow and an EXT-18 extension, which can be cut to the
required length.
Termination
Heat Shield
MEL-90F/F Elbow
Figure 9a. Typical Top Vent installation. If the 90° elbow is installed
directly on the fireplace, the height to the center of the
termination is 44".
Horizontal Venting
90° Elbow
Top Vent
150" max.
30" max.
Heat
Shield
Termination
Solid Sections
Exterior
Flex Section
Wall
Hearth
Figure 10. Extended Installation using a combination of solid and
flex venting. Use the vent graph to determine your
allowable run, then select appropriate components.
126"
30" max.
Heat
Shield
Heat Shield
Termination
MEXT Section
Figure 9b. Typical Top Vent installation. The solid sections can be
used in various combinations to obtain the desired vent
run. The vent run must fall within the limits set by the
venting graph.
Example 2:
A 10' section and elbow (MIHR-10) used in conjunction with 3 ft. flex
section (MFL-3) will, when extended in a five foot chase, allow for a
maximum horizontal run of twelve and one-half feet from the centre of
the fireplace to outside wall and a minimum of 7'6" when retracted in
opposite direction (see Figure 10 and 11).
"D" flex sections and "E" solid sections may be used in conjunction
with one another to obtain different possible horizontal length
installations. NOTE: Flex section must not exceed maximum
horizontal length of 3 feet. (see Figure 12).
Solid Sections
Flex Section
Termination
Exterior
Wall
Hearth
Figure 11. Retracted Installation using a combination of solid and
flex venting. Use the vent graph to determine your
allowable run, then select appropriate components.
3' max.
Flex Section
Heat
Shield
Termination
Hearth
Exterior
Wall
Figure 12. Horizontal flex installation.
P/N XG0112
Page 7 of 19
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