kozy heat TMT-3875 User manual

WARNING:Iftheinformationintheseinstructions
is not followed exactly, a fire or explosion may
result, causing property damage, personal injury
or loss of life.
TRIMONT
Direct Vent Gas Fireplace
MODELS: #TMT-3875
#TMT-3875-RF
INSTALLATION AND
OPERATING MANUAL
See-Thru Model
US Patent #6004493
‚Do not store or use gasoline or other flammable
vaporsandliquidsinthevicinityofthisoranyother
appliance.
WHAT TO DO IF YOU SMELL GAS:
‚Do not try to light any appliance.
‚Do not touch electrical switches; do not use the
phone in your building.
‚Immediately call your gas supplier from a
neighbor’s phone. Follow your gas supplier’s
instructions.
‚If you cannot reach your gas supplier, call the fire
department.
Installation & service must be performed by a qualified
installer, service agency, or the gas supplier.
This appliance may be installed in an aftermarket
permanentlylocated,manufactured(mobile)home,where
not prohibited by local codes.
This appliance is only for use with the type(s) of gas
indicated on the rating plate. This appliance is not
convertible for use with other gases, unless a certified kit
is used. An LP Gas conversion kit is included with this
fireplace.
IMPORTANT:
READ INSTRUCTIONS CAREFULLY BEFORE INSTALLATION.
FAILURE TO INSTALL THIS FIREPLACE CORRECTLY CAN
CAUSE SERIOUS STRUCTURAL AND FIRE HAZARDS AND
MAY VOID YOUR WARRANTY.
Shown with optional
Pier Conversion kit
May 2007
Report #216-F-13-5 www.kozyheat.com

INDEX
DESCRIPTION PAGE
SAFETY REQUIREMENTS / SPECIFICATIONS .............................................................................. 1-2
MINIMUM CLEARANCES ................................................................................................ 3-4
TYPICALINSTALLATIONOPTIONS......................................................3
VENTINGREQUIREMENTS.............................................................................................. 4-8
MINIMUM/MAXIMUMVENTINGREQUIREMENTS ......................................... 5
HORIZONTALVENTING ............................................................... 6
TERMINATIONCAPLOCATION......................................................... 7
VERTICALVENTING.................................................................. 8
DETERMINELOCATION ............................................................................................... 9-10
VENT SYSTEM FRAMING ..............................................................9
ROUGH-INDIMENSIONS..............................................................10
PREPARETHEFIREPLACE ..............................................................................................11
POSITIONTHEFIREPLACE ........................................................................................... 11-13
REMOVE THE GLASS ASSEMBLY ......................................................12
HORIZONTALHEATSHIELDINSTALLATION.............................................13
DIRECTVENTCHIMNEYINSTALLATION ................................................................................ 13-14
FANINSTALLATION.................................................................................................. 15-17
Model #TMT-3875 ................................................................15-16
Model #TMT-3875-RF ................................................................ 17
GAS LINE SPECIFICATIONS ........................................................................................... 18-19
SECURE THE MILLIVOLT BOARD .........................................................................................19
PIERCONVERSIONKITINSTALLATION ....................................................................................20
LOGINSTALLATION ....................................................................................................21
THERMOSTAT-WALLSWITCH-REMOTECONTROLINSTALLATION ..........................................................22
COMPLETETHEINSTALLATION ....................................................................................... 23-25
MODEL #TMT-3875 LIGHTING & SHUTDOWN ............................................................................ 26-27
MANIFOLD & INCOMING PRESSURE CHECK PROCEDURES .................................................28
MODEL #TMT-3875-RF LIGHTING & SHUTDOWN ......................................................................... 29-30
MANIFOLD & INCOMING PRESSURE CHECK PROCEDURES .................................................31
CLEANING & MAINTENANCE REQUIREMENTS ..............................................................................32
MILLIVOLT BOARD REMOVAL / INSTALLATION .......................................................................... 33-34
TROUBLESHOOTING ................................................................................................ 35-36
REPLACEMENTPARTSLISTS ............................................................................................37
WARRANTY POLICY ................................................................................................. 38-39

Page 1
IMPORTANT:
READ THIS MANUAL BEFORE INSTALLING AND USING THIS FIREPLACE
‘TRIMONT’ DIRECT VENT SEE-THRU / PIER GAS FIREPLACE
This fireplace has been tested to and complies with ANSI Z21.88B-2005 CSA 2.33B-2005 “VENTED GAS FIREPLACE HEATERS”
byOMNI-TestLaboratories, Beaverton,OR. Installationmustconformwithlocalbuildingcodesorintheabsenceoflocalbuilding
codes,with theNationalFuel GasCode, ANSIZ223.1/ NFPA54- CurrentEdition, ortheNatural orPropaneInstallation Code,CSA
B149.1.
COMMONWEALTH OF MASSACHUSETTS
INSTALLATIONS
WARNING: This Product Must Be Installed By A Licensed
Plumber Or Gas Fitter When Installed Within The
Commonwealth of Massachusetts.
IMPORTANT: Installation of a CO detector is required in
the fireplace room.
WARNING: Do not use this fireplace if any part has been
underwater. Immediatelycallaqualifiedservicetechnician
to inspect this appliance and to replace any part of the
control system and any gas control which has been under
water.
WARNING:
DO NOT REPLACE THIS BURNER UNIT WITH ANY
OTHER SIZED BURNER. REPLACEMENT WITH AN
UNAUTHORIZED BURNER CAN RESULT IN
TEMPERATURES EXCEEDING THE LIMITS FOR THIS
FIREPLACE, AND VOID YOUR WARRANTY.
IMPORTANT: NON-COMBUSTIBLE FACING MATERIAL
MAY BE APPLIEDOVER THE FACE. TO PREVENT THE
FACING MATERIAL FROM CRACKING AND FALLING
OFF DUE TO EXPANSION OF THE FACE WHEN
HEATED, DO NOT ATTACH FACING MATERIAL
DIRECTLY TO THE FACE OF THE UNIT. DO NOT
OBSTRUCT THE FLOW OF VENTILATION AIR.
CONSULTYOURLOCALORNATIONALINSTALLATION
CODES TO ASSURE THAT ADEQUATE COMBUSTION
AND VENTILATION AIR IS AVAILABLE.
INSPECT THE FIREPLACE & ALL COMPONENTS
Inspect the fireplace, vent system & all components. Contact your dealer if any parts are damaged or missing. Do not
install the fireplace with damaged, incomplete, or substitute parts.
PLANNING THE INSTALLATION
Prior to installation of this fireplace, the following must be considered:
‚See-Thru or Pier Installation.
‚Location of fireplace.
‚Configuration of vent system.
‚Gas piping.
‚Electrical wiring - Model #TMT-3875-RF, optional for Model #TMT-3875.
‚Framing.
‚Hearth height, width & depth. NOTE: A hearth is not required.
‚Materials used for finishing the fireplace.
‚Optional accessories used: Fan, wall switch, remote control, thermostat, etc..
NOTE: When thefireplaceisinstalleddirectlyoncarpeting,tile,orothercombustiblematerialsotherthanwoodflooring,itmust
beinstalledonametalorwoodpanelextendingthefull widthand depth ofthe fireplace. Theminimum forthe supportplatform
under the fireplace 38 3/4" wide by 24" deep.
Ifmasonryistobeused(optional),preparethenecessaryfoundationforthemasonryload.Whenmasonryconstructionisbeing
used, a lintel must be used over the top of the fireplace to support the added weight.

Page 2
8 1/4"
SPECIFICATIONS
Height .........................34½"(876 mm)
Height to top of stand-off ............ 46"(1168 mm)
Width.......................... 38¾"(984 mm)
Depth............................ 24"(610 mm)
Refer to Diagrams for additional measurements.
Figure 1

Page 3
68"
33 1/2"
33 ½"
INSTALLATION REQUIREMENTS:
CLEARANCE TO COMBUSTIBLES:
From face top*: 11 ½” Floor to ceiling : 68"
From vented / non-vented ends: 1 ¾" Side to adjacent sidewall: 1¾”
From full door face sides: ¼" Side trim: 1"
Bottom to flooring: 0" Top to 3/4" trim: 11¾”
Non-combustible zone areas:
A non-combustible zone must be maintained from the top of the fireplace as follows: Illustrations are shown
in Figures 2A & 2B. .
See-thru installations: 33 ½" from the top of the fireplace
Pier installations: 33 ½” from the top of the fireplace
Figure 2A - Typical See-thru Installation
Figure 2B - Typical Pier Installation
MANTEL REQUIREMENTS*- Figure 3
Fireplace top to 12" mantel: 12" minimum*
* Mantel height must be raised 1" for every additional 1" of depth. See Figure 3, page #4 for mantel
requirements. No mantel is allowed from 0" - 12" from the top of the fireplace.
HEARTH REQUIREMENTS - Figure 3, page #4.
When the fireplace is installed on carpet, tile or other combustible material, it must be installed on a metal or wood panel
extending the full width & depth of the fireplace.
The minimum platform size is 38 3/4" wide X 24" deep.
HEARTH EXTENSION:
If a hearth extension is desired, combustible materials may be used.

Page 4
Figure 3
Mantel projection
Hearth Extension: Combustible material may be used.
VENT SYSTEM APPROVAL & CLEARANCES:
Dura-Vent, Selkirk Metalbestos or Ameri-Vent, 8" x 5" vent systems:
Horizontal Sections: Top: 3"
Sides & Bottom: 1"
Vertical Sections: All sides: 1"
Kozy Heat #800 Series Flex Vent System Horizontal venting only: Top: 3"
Sides & Bottom: 1"
IMPORTANT: THE KOZY HEAT WALL THIMBLE PASS-THRU, PART #800-WPT MUST BE USED ON
ALL HORIZONTAL VENT RUNS. THE MINIMUM WALL THICKNESS FOR THIS PASS-
THRU IS 4 ½" AND THE MAXIMUM WALL THICKNESS IS 7 ½".
NOTE: RLH DECORATIVE TERMINATION CAPS MAY BE USED ON THIS FIREPLACE.
THIS FIREPLACE IS DESIGNED TO BE USED WITH ANY OF THE ABOVE VENT SYSTEMS WITHOUT THE USE OF AN
ADDITIONAL ADAPTOR.
Contact your dealer for the appropriate vent system components for your specific application.
Refertotheventsystemmanufacturer’sinstallationmanualforcompleteinstallation instructions. Installationmustconform withthe
venting requirements & restrictions as outlined in this manual.
IMPORTANT: Consult the local and national installation codes to assure that adequate combustion and ventilation air is
available.

Page 5
VENTING SPECIFICATIONS:
IMPORTANT: Flame height and appearance will vary depending upon venting configuration and type of fuel used. Venting
requirements apply to both Natural Gas & LP Gas.
HORIZONTAL TERMINATIONS:
IMPORTANT: The horizontal heat shield included with this fireplace must be installed when using a 90° elbow
directly on the collars of the fireplace to horizontally position the vent system.
Minimum: Natural Gas models: 90° elbow at start followed by 6" section, then termination cap.
LP Gas models: 6" vertical rise, followed by a 90° elbow, then termination cap.
Maximum: Natural Gas models: 90° elbow at start followed by a maximum 10 ft.
LP Gas models: 6" vertical rise, followed by a 90° elbow, then maximum 10 ft.
VERTICAL TERMINATIONS:
RESTRICTOR: The restrictor included with this fireplace must be installed on all vertical vent terminations without
elbows.
Minimum* Ameri-Vent, Selkirk Metalbestos 5" x 8" vent systems: 4 ft.
Simpson Dura-Vent 5" x 8" vent system: 8 ft.
Maximum: All approved chimney systems: 35 ft.
HORIZONTAL & VERTICAL COMBINATION: 30 ft. = 10 ft. maximum horizontal / 20 ft. maximum vertical
ELBOWS: FOR EACH ADDITIONAL ELBOW USED AFTER THE FIRST ELBOW, 3 FT. MUST BE SUBTRACTED FROM
THE MAXIMUM VENTING ALLOWED. NOTE: (2) 45-DEGREE ELBOWS MAY BE USED IN PLACE OF (1)
90-DEGREE ELBOW.
RESTRICTOR USAGE: Depending on the venting configuration, a restrictor may be needed to enhance the flame
appearance, particularly if there is more vertical rise than horizontal length.
Insert the restrictor into 5" collar before first vent system section is installed. The restrictor
may also be installed in the 5" exhaust collar after installation by removing the baffle to expose the
5" exhaust collar.

Page 6
HORIZONTAL VENTING
IMP0RTANT: THE KOZY HEAT WALL PASS-THRU, PART #800-WPT, MUST BE USED ON ALL HORIZONTAL VENT
RUNS. THE MINIMUM WALL THICKNESS FOR THIS PASS-THRU IS 4 ½" AND THE MAXIMUM WALL
THICKNESS IS 7 ½".
Minimum Horizontal Venting
NOTE: The horizontal vent shield (not shown for clarity) must be installed when using a 90° elbow directly
on the fireplace to horizontally position the vent system.
Figure 4A
90° Elbow
6" Pipe
Minimum horizontal for
Natural Gas* models shown Horizontal
Termination Cap
*LP Gas model minimum horizontal venting: (1) 6" pipe section directly on the fireplace, then a 90° elbow, followed by (1)
6" pipe section and finally the termination cap.
Maximum Horizontal Venting
90° Elbow
Maximum 10 ft.
Figure 4B
Horizontal
NOTE: The horizontal vent shield (not shown for clarity) must be Termination
installed when using a 90° elbow directly on the fireplace Cap
to horizontally position the vent system.

Page 7
TERMINATION VENT CAP LOCATION:
This gas appliance must not be connected to a chimney flue serving another type of appliance.
GENERAL:
1. Terminations against vinyl siding must use a vinyl siding protector. Follow instructions included.
2. DO NOT RECESS TERMINATION KIT INTO OUTSIDE BUILDING MATERIALS - i.e.: brick, stone, siding, etc.. If necessary,
extend framing so that termination kit will be exposed once building materials are installed.
3. Vent termination must not be located where it will become plugged by snow or other material. The flow of combustion and
ventilation air must be not obstructed.
LOCATION CLEARANCES:
1. Above grade, veranda, porch, deck, balcony - 12". (A)
2. Operable window - 12". (B)
3. Permanently closed window* - 12" (recommended to prevent condensation on window). (C)
4. Ventilated soffit* - 24". (D)
5. Unventilated soffit* - 12". (E)
6. Outside / inside corner* - 3". (F)
7. Meter / Regulator: NOT TO BE INSTALLED ABOVE within 3 ft. horizontally from the center line of the regulator.
8. Service regulator vent outlet - 3 ft. radius.
9. Non-mechanical air supply inlet to building - 12".
10. Combustion air inlet to any other appliance - 12".
11. Mechanical air supply inlet. (G) - CANADA: 6 ft. US: 3 ft. above if within 10 ft. horizontally.
NOTE: Massachusetts installations: 10 ft.
12. Above furnace exhaust or inlet - 12".
13. Above paved side-walk or paved driveway located on public property - 7 ft. (H)
NOTE: A vent cannot be located directly above a side-walk or paved driveway that is located between two single family
dwelling and serves both dwellings.
14. Under veranda, porch, deck, or balcony (must be fully opened on a min. of 2 sides) - 12". (I)
15. Between two horizontal terminations - 12".
16. Between two vertical terminations - 12". (J) - Note: May be the same height.
*Clearance must be in accordance with local installation codes & the requirements of the gas supplier.
Figure 5

Page 8
WHEN VERTICALLY TERMINATING, FOLLOW THE VENT SYSTEM INSTALLATION INSTRUCTIONS TO
DETERMINE THE MINIMUM CHIMNEY HEIGHT ABOVE THE ROOF LINE.
CAUTION: This gas appliance must not be connected to or joined with any chimney flue
serving any other appliance.
Figure 6
NOTE: Horizontal Vent Heat shield is not used on
vertical venting configurations.
Maximum Vertical: 35 ft.
The restrictor, included with this
fireplace, must be used on all
vertical venting configurations.
Pier Model Shown
Install restrictor into 5" collar before
first chimney section is installed.

Page 9
DETERMINE LOCATION
1. Determine the exact position of your fireplace, the width, depth and height of the hearth (optional), and location of the vent system
termination. Ifpossibleplacethefireplaceinsuchamanner thattheventterminationwillbeplacedbetweentwostudssoadditional
framing is not necessary. IMPORTANT - Vent cap location must be in compliance with the guidelines listed in this manual.
NOTE: Due to high temperatures, this fireplace should be located out of traffic areas and away from furniture and draperies.
2. Build the hearth to the desired size and height. If a hearth extension is desired, combustible material may be used.
HEARTH REQUIREMENTS: When the fireplace is installed directly on carpet, tile or other combustible material, it must be installed
on a wood or metal panel extending the full width and depth of the fireplace. The minimum platform size is 38 3/4" wide X 24" deep.
If masonry is to be used (optional), prepare the necessary foundation for the masonry load. When masonry construction is being
used,alintel,Part#617forsee-thruinstallations,Part#788-Tforpierinstallations,mustbeusedoverthetopofthefireplacetosupport
the added weight.
3. HORIZONTAL TERMINATIONS:
IMPORTANT: The horizontal vent heat shield must be
installedwhenusinga90°elbowtohorizontally positionthe
ventsystemorwhenusingthe#800seriesKozyHeatflexible
vent system for horizontal terminations. Refer to page #13
of this manual for instructions on attaching the horizontal
vent heat shield.
Frame a 12 1/2" high (H) x 10 7/8" wide (W) opening on the
exterior wall for the chimney termination.
This opening size includes the required 3" clearance at the
top and 1" clearance at the sides and bottom of approved
rigid vent systems and the Kozy Heat #800 series flexible
vent system.
RIGID PIPE APPLICATIONS:
NATURAL GAS MODELS:
Toachievetheminimumhorizontalventingrequirementsfor
RIGIDPIPEAPPLICATIONS, aminimumof 481/8"tothetop
of the framed opening (A) from the floor or hearth the
fireplace is setting on is required. Figure 7A.
LP GAS MODELS:
Toachievetheminimumhorizontalventingrequirementsfor
RIGIDPIPEAPPLICATIONS, aminimumof52 3/4"tothetop
of the framed opening (A) from the floor or hearth the
fireplace is setting on is required. Figure 7A.
KOZY HEAT #800 SERIES FLEX PIPE APPLICATIONS:
Toachievetheminimumhorizontalventingrequirementsfor
FLEX PIPE APPLICATIONS, a minimum of 54 ½" to the top
of the framed opening (A) from the floor or hearth the
fireplace is setting on is required. Figure 7A.
4. VERTICALTERMINATIONS:Followventpipemanufacturer’s
installation instructions for vertical terminations. A
minimum 1" clearance on all sides of vertical vent pipe
sections must be maintained.
NOTE: A restrictor, (included), is required for all vertical
installations. Positionin the 5" collar on topof the
fireplace prior to installing the first vent system
section.
The horizontal vent heat shield is not used for vertical
venting configurations.
Figure 7A
A

Page 10
5. Rough in the wall enclosure. Figures 7B & 7C.
IMPORTANT:
The top header must be installed in the upright position to
maintain the ‘non-combustible’ zone requirements.
The rough opening depth may be reduced to a minimum of
19" only.
IMPORTANT: Framing dimensions should allow for wall
covering thickness and fireplace facing materials. Adjust
rough opening size as necessary to maintain at least the
minimum clearance requirements.
SEE-THRU INSTALLATIONS:
MINIMUM FINISHED OPENING DIMENSIONS (Wall
covering / facing materials included):
Figure 7B: 46" high x 42 1/4" wide x 24" deep
PIER INSTALLATIONS:
MINIMUM FINISHED OPENING DIMENSIONS (Wall
covering / facing materials included):
Figure 7C: 46" high x 40 1/2" wide x 24" deep
Figure 7B
See-thru shown for vertical termination.
Figure 7C
Pier Installation with minimum horizontal venting shown.
NOTE: Provide adequate clearance in front of the fireplace to access the control valve, install and attach gas line, install a fan, etc..
Do not obstruct the upper and lower convection air passage areas to allow proper ventilation air around the fireplace. Room air
entersthrough thelowerpassage,isheatedand exitsattheupperpassage. Blockingthesepassagesmayresultinoverheating
the fireplace, creating a potentially hazardous situation.
42¼"
24"
46"
Note: Measurements are
finished dimensions.
40 ½"
24"
46" Note: Measurements are
finished dimensions.

Page 11
PREPARE THE FIREPLACE
STAND-OFF ASSEMBLY & INSTALLATION - Figure 8.
1. The top stand-off brackets must be formed and correctly positioned prior to positioning the fireplace into the framed opening.
2. The top stand-off brackets are attached to the top of the fireplace in a flat form when the fireplace is shipped.
3. Remove the screw securing each stand-off bracket and remove from the fireplace.
4. Remove the remaining (2) screws under the stand-off brackets and set aside.
5. Form each stand-off as shown.
6. Re-attach the stand-off brackets to the top of the fireplace using the
screws removed in steps #2- #3 above.
Figure 8
POSITION THE FIREPLACE
1. Place the fireplace into position. Figure 9.
Figure 9
NOTE: See-Thru installation shown
CAUTION: STAND-OFFS ARE NOT LOAD BEARING.
68"
33 1/2"

Page 12
2. REMOVE THE GLASS ASSEMBLY.
From the valve access side:
A. Removetheupperhood&upperlouver,ifinstalled,
to expose the spring-loaded handles securing the
glass assembly at the top.
B. Open the lower grill, if installed, to expose the
spring-loadedhandlessecuringtheglass assembly
at the bottom.
CAUTION: TO PREVENT THE GLASS ASSEMBLY FROM
FALLING FROM THE FIREPLACE AND BECOMING
DAMAGED, FOLLOW THESE DIRECTIONS EXACTLY WHEN
REMOVING THE GLASS ASSEMBLY.
C. Pull the handles out, then ‘down’ to release the
glass assembly at the bottom.
D. Pull the handles out, then ‘up’ to release the glass
assembly at the top.
E. Lift the glass assembly off from the front of the
fireplace and set aside where it will not be broken.
F. Remove the log package from the firebox and set
aside. Figure 10
3. VENT SYSTEM INSTALLATION:
Install the vent system components for your specific venting configuration. Follow the vent system manufacturer’s
installation instructions in conjunction with the venting requirements in this installation manual.
HORIZONTAL & VERTICAL TERMINATIONS: All firestops, support brackets, etc. must be used as specified by the vent
system manufacturer.
All clearances and venting requirements as specified in this manual must be followed.
HORIZONTAL VENTING:
WALL PASS-THRU INSTALLATION:
IMPORTANT: The #800-WPT wall pass-thru must be used on all horizontal vent termination. The minimum wall
thickness for this pass-thru is 4 ½" and the maximum wall thickness is 7 ½".
IMPORTANT: If using the Kozy Heat #800 series flexible vent system, use a tin snips to remove the inner ring on each wall
thimble section. This will provide adequate room for the flexible vent system to be installed.
A. Measure the wall thickness and cut the insulation
panel this length.
B. Install the wall pass-thru section #1(the section with
the 3/8" flange) into the framed opening and secure
to the interior wall with screws (not provided).
C. From the exterior, place the insulation between the
flange and top of the framed opening in the wall
pass-thru section #1.
D. Install section #2 of the wall pass-thru assembly into
the framed opening, overlapping the metal sections
as necessary to accommodate the wall thickness.
Secure to the exterior wall with screws (not
provided).
Figure 11

Page 13
HORIZONTAL HEAT SHIELD INSTALLATION:
The horizontal heat shield, included with this fireplace,
must be installed when a 90° elbow is installed directly to
the top of the fireplace.
1. Remove the center insulation section from the
fireplace top. Figure 12A.
2. Install the 90° elbow onto the fireplace following vent
pipe manufacturer’s instructions.
2. Install remaining vent pipe sections per your specific
venting configuration.
3. Bend the sides and end of the horizontal heat shield
at 90° angles as shown in Figure 12B.
4. Place the horizontal vent heat shield on top of the
fireplace aligning the holes in the shield to the
corresponding holes in the top, enclosing the 90°
elbow.
5. Secure the shield to the top of the fireplace with (8)
screws provided (4 each side).
Remove center
insulation
for horizontal
heat shield
installations
Figure 12A
Figure 12B
INSTALLATION OF #800 SERIES DIRECT VENT TERMINATION KIT(S) - HORIZONTAL TERMINATIONS ONLY
IMPORTANT: The flex pipe is permanently attached to the exterior plate. DO NOT ATTACH the #844 or #845 termination kit to the fireplace (or
extension kit) until it has passed through the wall or roof. The termination plates should all be installed on the exterior of the outside wall.
IF TERMINATING AGAINST VINYL SIDING, A VINYL SIDING PROTECTOR, INCLUDED WITH THE #844 and #845 DIRECT VENT KITS,
MUST BE USED. FOLLOW INSTRUCTIONS INCLUDED.
CAUTION: This gas appliance must not be connected to a chimney flue serving another type of appliance.
1. If your vent system application is 8' or less from the top of the fireplace and doesn’t require an extension kit, proceed to step #7.
2. If your vent system application will require one or more extension kits (part #846), proceed with the following steps. Each #846
extension kit contains enough 5" and 8" flexible aluminum to extend the chimney an additional 6'.
3. Gently stretch the 5" & 8" flexible aluminum pipes on the termination kit (#844 or #845) and on each extension kit, if used, the
length required so when all the sections are connected together, the vent system length for your installation is attained.
IMPORTANT: DO NOT STRETCH THE EXTENSION KIT BEYOND 6'. DO NOT STRETCH BEYOND WHAT IS REQUIRED - IT IS VERY
DIFFICULT TO RECOMPRESS THE FLEX PIPES ONCE STRETCHED.
Horizontal Heat Shield
90° elbow

Page 14
4. Using your extension kit pieces, place a bead of sealant outside the 5" flex pipe collar - the end with the EXTERNAL lip - and slide
it inside the 5" pipe on top of the fireplace. Secure with 3 additional evenly spaced screws.
5. Place a bead of sealant inside the 8" flex pipe collar - the end with the internal lip - and slide it over the 8" pipe on top of the
fireplace. Secure with 3 additional evenly spaced screws.
(B)
Minimum venting requirements: A minimum of 51½”
to the top of the vent pipe and 54½" to the top of the
framed opening from the floor or hearth the fireplace
is setting on is required. (C)
Refer to pages #4 - #8 for complete venting
requirements & restrictions. (A)
RESTRICTOR USAGE:
Depending on the venting configuration, a restrictor may be needed to
enhance the flame appearance, particularly if there is more vertical rise
than horizontal length.
Insert the restrictor into 5" collar on the fireplace before vent system is
installed.
Figure 13
6. If additional extension kits are being used, repeat steps 4 and 5, placing the 5" & 8" pipes onto the previous extension kit.
Referring Figure 13:
7. An #800-WPT wall pass-thru must be used for horizontal runs that pass through either interior or exterior walls. Install the #800-
WPT wall pass-thru on both sides of the 12 1/2" high x 10 7/8" wide square opening and secure with nails or screws.
NOTE: Attachment brackets are included with the termination kit. These optional brackets should be screwed or nailed (screws not
provided) onto the top and bottom of the 12 1/2" high x 10 7/8" square opening, on the exterior of the house. The termination plates then
fit between these brackets, and using the screws provided, screw the brackets to the termination kit box (A). Attach the vinyl siding
protector (C).
8. Apply a liberal bead of exterior sealant around the outer edge of the plate (A), and place the assembly through the 12 1/2“ High X
10 7/8" Wide square opening in the exterior wall. Place screws through the four slots (B), securing it in place.
9. Gently pull the 5" & 8" flexible aluminum down to the top of the extension kit, or the top of the fireplace if no extension kits were
used.
10. Place a bead of sealant outside the 5" flex pipe collar and slide it into the 5" pipe on the extension kit or top of the fireplace.
Secure with 3 additional evenly spaced screws.
NOTE: This connection is very difficult to remove without damaging the collars once installed.
11. Place a bead of sealant inside the 8" flex pipe collar and slide it over the 8" pipe on the extension kit or top of the fireplace.
Secure with 3 additional evenly spaced screws.
NOTE: This connection is very difficult to remove without damaging the collars once installed.
12. OPTIONAL: Place insulation between the 8" pipe and the wall studs.
17"

Page 15
MODEL #TMT-3875 ONLY: OPTIONAL FAN KIT INSTALLATION INSTRUCTIONS
INSTALLATION OF THIS FAN SHOULD BE DONE ONLY BY A QUALIFIED INSTALLER
NOTE: The wiring must be done prior to enclosing the sides of the fireplace. An electrical box and romex connector are pre-
installed on a removable panel on the vented end of the fireplace. A receptacle / speed control assembly and (3) wire
nuts are included in the fireplace components packet.
NOTE: This optional fan kit #TMT-028 includes (1) 75 CFM fan with temperature control switch and 4 ft. cord:
NOTE: Code approved line voltage wiring 14 gauge or better must be used when wiring this assembly. Refer to your local
electrical codes for specific requirements in your area.
WARNING: This appliance is equipped with a three-prong (grounding) plug for protection against shock hazard and should be plugged
directly into a properly grounded three-prong receptacle. Do not cut or remove the grounding prong from this plug.
Figure 14A

Page 16
INSTALLATION INSTRUCTIONS
THE FOLLOWING COMPONENTS MUST BE REMOVED FROM THE
VALVE SIDE OF THE FIREPLACE PRIOR TO INSTALLATION OF
THIS FAN. REFER TO THE CORRESPONDING PAGES IN THIS
INSTALLATION MANUAL FOR ASSISTANCE IF NECESSARY.
1. Upper hood, upper louver & lower grill, if installed. Refer to
page #25 if necessary.
2. Glass assembly if not previously removed. Refer to page
#12 if necessary.
Note: It is not necessary to remove the millivolt board to install
this optional fan kit.
INSTALL THE FAN:
1. Slide the fan through the lower grill opening (left side of the
valve)and align themounting holesinthefan bracketontothe
mounting studs on the non-vented end of the fireplace.
2. Secure the fan bracket to the studs with the nuts provided.
3. Remove the screw securing the removable access panel (with
electricalbox&romexconnectorinstalled)fromtheventedend
of the fireplace.
4. Insert 115V wiring (with ground) through the romex connector
and wire to the speed control / receptacle assembly matching
the black (hot) white (neutral) and green (ground) wire to the
correspondingwireonthespeedcontrol/receptacleassembly.
NOTE: (3) wire nuts are included in the fireplace components
packet.
5. Secure the speed control / receptacle assembly into the
electrical box with the (2) screws provided. Figure 14C.
6. Re-install the electrical access panel and secure with the
screw previously removed.
7. Place the thermostatic control switch on the bottom of the
firebox. Figure 14C.
8. Plug cord into receptacle in the electrical box. Figure 14C.
9. Turn on/off speed control counter-clockwise until it ‘clicks’.
This is the ‘OFF’ position.
10. Turnthespeedcontrol‘ON’byturningtheknobclockwisepast
the ‘click’ - this is the highest setting.
11. Re-install the glass assembly.
12. Re-install the lower grill, upper louver & upper hood.
NOTE: The fan will not operate unless the speed control has been turned
‘ON’ and sufficient heat has been applied to the temperature control
switch. The fan will turn ‘ON’ and ‘OFF’ automatically when the fireplace
heats and cools. Adjust fan to desired speed while it is running.
Figure 14B
Figure 14C
TEMPERATURE CONTROL SWITCH POSITION: Prior to adjusting the
temperature control switch, unplug the 3-prong plug on the fan cord from the
receptacle. Adjust the position of the temperature control switch to a warmer
location under the firebox to turn the fan ‘ON’ sooner or move itto a cooler
location under the firebox to turn the fan ‘ON’ later. The fan will turn on when
the sensor in the temperature control switch reaches 110oF and will turn
‘OFF’ when the sensors reach 90oF. After adjustment, plug the 3-prong plug
on the fan cord into the receptacle.
NOTE: This appliance must be electrically grounded and connected in
accordance with local codes, or in the absence of local codes, with the
National Electrical Code, ANSI/NFPA 70-Current edition, or the Canadian
Electrical Code, CSA C22.1.
Non-Vented End Mounting studs
Speed Control /
receptacle assembly
Temperature
Control Switch

Page 17
MODEL #TMT-3875-RF ONLY: FAN INSTRUCTIONS
INSTALLATION OF THIS FAN WIRING SHOULD BE DONE ONLY BY A QUALIFIED INSTALLER
IMPORTANT: A fan assembly is pre-installed and wired to the RF gas valve in the Model #TMT-RF.
The wiring must be done prior to enclosing the sides of the fireplace. An electrical box & romex connector are pre-
installed on a removable panel on the vented end of the fireplace. A receptacle and cover is included in the fireplace
components packet.
NOTE: Code approved line voltage wiring 14 gauge or better must be used when wiring this assembly. Refer to your local
electrical codes for specific requirements in your area.
WARNING: This appliance is equipped with a three-prong (grounding) plug for protection against shock hazard and should be plugged
directly into a properly grounded three-prong receptacle. Do not cut or remove the grounding prong from this plug.
Figure 15
1. Remove the screw securing the removable access panel (with electrical box & romex connector installed) from the vented end of
the fireplace.
2. Insert 115V wiring (with ground) through the romex connector and wire to the receptacle. Secure the receptacle to the electrical
box with screws.
3. Re-install the electrical access panel and secure with the screw previously removed.
4. Plug the 3-prong plug on the fan cord into the receptacle.
5. Upon complete installation of this fireplace, follow the lighting & shutdown instructions on pages #29-#30 of this manual as well as
the instructions included with the remote transmitter for complete fan operation guidelines.

Page 18
RUN THE GAS LINE.
CAUTION: Installation of the gas line must only be done by a qualified person in accordance with local building codes.
GAS CONVERSIONS - Models #TMT-3875
This fireplace is manufactured for use Natural Gas. An LP gas conversion kit, part #OCK-S45, is included with this fireplace.
Follow instructions included with this conversion kit.
GAS CONVERSIONS - Model #TMT-3875-RF
This fireplace is manufactured for use with Natural Gas. An LP gas conversion kit, part #OCK-H45L-RF, is included with this fireplace.
Follow instructions included with this conversion kit.
The conversion shall be carried out in accordance with the requirements of the provincial authorities having jurisdiction and in
accordance with the requirements of the ANSI Z223.1 installation code.
NOTE: This fireplace is equipped with a 3/8" x 18” long flexible gas connector and manual shut off valve.
NOTE: The gas line should be run to the point of connection where the shut-off valve and flexible gas line will connect.
CAUTION: The manual shut-off valve or flexible gas tubing must not extend outside of the fireplace cavity. See the WARNING label
affixed to the flexible tubing for additional installation instructions and warnings.
NATURAL GAS:
The minimum inlet gas supply pressure: 5.0 inches W.C. ( 7.0 inches W.C. recommended)
The maximum inlet gas supply pressure: 10.5 inches W.C.
Model #TMT-3875-RF: Manifold pressure: 3.5 inches W.C. Manifold pressure (lo setting): 1.7 inches W.C.
Orifice size: #29 Input: 47,000 BTU/hr. Minimum input: 23,500 BTU/hr
Model #TMT-3875: Manifold pressure: 3.8 inches W.C. Manifold pressure (lo setting): 1.1 inches W.C.
Orifice size: #30
Efficiency: 72.4% AFUE: 71.79% P-4 AFE: 60.9%
LP GAS:
The minimum inlet gas supply pressure: 11.0 inches W.C. (recommended)
The maximum inlet gas supply pressure: 13.0 inches W.C.
Manifold Pressure: 10.0 inches W.C. Manifold Pressure (lo setting): 6.3 inches W.C.
Orifice size: #45 Input: 46,000 BTU/hr. Efficiency: 75.2% AFUE: 77.2% P-4 AFE: 66%
Minimum input: 26,500 BTU/hr
This fireplace is equipped for use at altitudes of 0-2,000 ft. in the U.S. and 0-4,500 ft.* in Canada.
IMPORTANT: The efficiency rating of this appliance is a product thermal efficiency rating determined under
continuous operating conditions and was determined independently of any installed system.
NOTE: For high altitude installations consult the local gas distributor or the authority having jurisdiction for proper rating methods.