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Installation & Owner’s Manual

Installation, Care and Operation

INSTALLER:  Leave this manual with party responsible for use and operation.

OWNER:  Retain this manual for future reference.

VENT FREE FIREBOX

NOTICE: 

DO NOT

 discard this manual!

DO NOT

 store or use gasoline or other flam

-

mable vapors and liquids in the vicinity of this

or any other appliance.

• DO NOT

 overfire. Overfiring will void your

warranty.

• Comply with all minimum clearances to com

-

bustibles as specified. Failure to comply may

cause house fire.

   WARNING: If the information in these 

instructions is not followed exactly, a fire 

or explosion may result causing property 

damage, personal injury, or death.

WARNING

HOT SURFACES

Glass and other surfaces are hot during 

operation AND cool down.

Hot glass will cause burns.

DO NOT

 touch glass until it is cooled

• NEVER allow children to touch glass

• Keep children away

• CAREFULLY  SUPERVISE  children  in  same  room  as

fireplace.

• Alert children and adults to hazards of high temperatures.

High temperatures may ignite clothing or other flammable 

materials.

• Keep  clothing,  furniture,  draperies  and  other  flammable

materials away.

Carefully review the instructions supplied 

with the decorative type unvented room 

heater for the minimum fireplace size 

requirement.
DO NOT INSTALL AN APPLIANCE IN THIS 

FIREBOX UNLESS THIS FIREBOX MEETS 

THE MINIMUM DIMENSIONS REQUIRED 

FOR THE INSTALLATION.

Model(s): 

        LCUF32CR-B

        LCUF36CR-B 

        LCUF42CR-B  

For use with a listed gas-fired unvented room 

heater not to exceed 40,000 BTU/hr.  Do not 

build a wood fire.  

Installation  and  service  of  this  appliance  should  be  performed  by 

qualified  personnel,  Hearth  &  Home  Technologies  recommends 

HHT Factory Trained or NFI certified professionals.

1

Monessen • LCUF32/36/42 Installation and Operating Manual • 4607-900 • Rev D • 3/21

Summary of Contents for LCUF32CR-B

Page 1: ...glass until it is cooled NEVER allow children to touch glass Keep children away CAREFULLY SUPERVISE children in same room as fireplace Alert children and adults to hazards of high temperatures High temperatures may ignite clothing or other flammable materials Keep clothing furniture draperies and other flammable materials away Carefully review the instructions supplied with the decorative type unv...

Page 2: ...ETIME WARRANTY 5 2 Important Safety and Operating Information 7 3 General Installation Information Before You Start 9 Check Parts 9 Tools Needed for Installation 9 4 Firebox and Framing Dimensions Dimensions 10 5 Hearth Dimensions and Firebox Locations Hearth Dimensions 11 Firebox Locations 11 6 Clearances 12 7 Fireplace Canopy and Gas Line Installation Securing Leveling Appliance 14 Canopy Instal...

Page 3: ...ble materials not installed in non combustible areas Builder Gen Contractor Installer Date Comments Further description of the issues who is responsible Installer Builder Other Trades etc and corrective action needed That this checklist remain visible at all times on the fireplace until the installation is complete __________________________ by ______________________on _________ Hearth extension i...

Page 4: ...e to the Monessen family of fireplace products 1 Welcome Monessen is a registered trademark of Hearth Home Technologies Brand _________________________________________________ Model Name ____________________________ Serial Number ___________________________________________ Date Installed ___________________________ Fireplace Information Local Dealer Information DEALER Fill in your name address pho...

Page 5: ...anty coverage shall commence no later than 24 months following the date of Product shipment from HHT regardless of the installation or occupancy date The term Lifetime in the table below is defined as 20 years from the beginning date of warranty coverage for gas appliances and 10 years from the beginning date of warranty coverage for wood and pellet appliances These time periods reflect the minimu...

Page 6: ...r such causes 6 use of fuels other than those specified in the operation instructions 7 installation or use of components not supplied with the applicable Product or any other components not expressly authorized and approved by HHT 8 modification of the appliance not expressly authorized and approved by HHT in writing and or 9 interruptions or fluctuations of electrical power supply to the applica...

Page 7: ...nted heater in a bathroom 12 Do not install the unvented heater in a bedroom unless the maximum input rating is equal to or less than 10 000 Btu hr 13 Correct installation of the ceramic fiber logs proper location of the heater and annual cleaning are neces sary to avoid potential problems with sooting Sooting resulting from improper installation or operation can settle on surfaces outside the fir...

Page 8: ...art of the control system and any gas control which has been under water 25 Never burn solid fuels in a fireplace where a unvented room heater is installed 26 Always have a fireplace screen in place when the appliance is in operation and unless other provisions for combustion air are provided the screen shall have an opening s for induction of combustion air 27 Do not fill spaces around the firebo...

Page 9: ...mbustible Caulking material noncombustible Wall finishing materials Piping complying with local codes Pipe sealant approved for use with propane L P G resistant to sulfur compounds Refer to the installation instructions provided with the log sets for items required for log set installation In planning the installation for the appliance it is necessary to determine where the unit is to be installed...

Page 10: ... 3 4 48 3 4 E 50 1 4 52 7 8 57 1 4 F 71 1 8 75 1 8 80 7 8 G 35 1 4 37 1 4 40 1 8 Figure 4 1 Firebox and Framing Dimensions B A Rough Opening Height C 22 3 4 Rough Opening Depth D Rough Opening Width 1 2 5 8 23 F E E G I 5 1 4 37 3 4 30 3 4 25 1 4 1 3 8 37 1 4 3 3 6 3 4 20 3 8 9 3 8 13 1 8 9 3 8 2 7 8 10 Monessen LCUF32 36 42 Installation and Operating Manual 4607 900 Rev D 3 21 ...

Page 11: ...ffic or windy or drafty areas DO NOT INSTALL WHERE CURTAINS FURNITURE CLOTHING OR OTHER FLAMMABLE OBJECTSARE LESS THAN 42 FROM FRONT OF HEATER Never obstruct the front opening of the vent free firebox or restrict the flow of combustion and ventilation air Minimize modifications to existing construction Refer to Figure 5 2 for location suggestions Do not install in the vicinity where gasoline or ot...

Page 12: ...e Material Only if Needed to Cover Radiant Top Face Finish Wall Combustible Material Area NOTE The canopy supplied with the unit must be installed for correct mantel clearances See canopy installation on page 13 Figure 6 1 Clearance and Height Requirements Figure 6 2 Mantel Clearances Figure 6 3 Mantel Leg Clearance A B C D E Combustible in 12 14 15 50 16 75 18 mm 305 356 394 425 457 Non combustib...

Page 13: ... the firebox standoffs The firebox may be installed directly on a combustible floor or raised on a platform of an appropriate height When the firebox is installed directly on carpeting tile or other combustible material other than wood flooring the firebox shall be installed on a metal or wood panel extending the full width and depth of the enclosure WARNING Do not fill spaces around firebox with ...

Page 14: ...ach firebox and MUST be in stalled for safe operation 1 Locate three 3 screws at the front edge of face one at each end and one in the center 2 Loosen screws slightly slide canopy slots against screws and tighten in place Figure 7 2 WARNING The firebox canopy must not be modified or replaced with a canopy that may be provided with the vent free decorative room heater WARNING Close fireplace screen...

Page 15: ...the supply tank pressure to 13 w c maximum Any copper tubing used to supply propane L P G from the tank must be internally tinned NOTE When connecting propane L P G vent free room heaters you must use pipe sealant resistant to propane L P G IMPORTANT Hold heater regulator with a wrench to prevent movement when connecting to inlet piping Check gas type The gas supply must be the same as stated on t...

Page 16: ...on air from attic space or garage space 5 Locate air supply inlet at least 3 away from any appliance vent terminal 6 Avoid extremely long runs and numerous turns in the duct leading from the fireplace to the combustion air assembly These conditions increase the resistance to the free flow of air through the duct Refer to Figures 8 1 through 8 4 for methods of installing the outside air for combust...

Page 17: ...e building s outside 3 Install hooded air inlet in the sidewall of the structure 4 Assemble the flexible duct ID4 or UD4 not supplied between the collar and the hooded air inlet Secure it into position with the supplied wire ties Outlet placed higher than 3 ft below the termination cap Attic space Garage or combustible liquids storage Outlet blocked by snow leaves etc Clear area outside house or i...

Page 18: ...he left and right front NOTE Brackets located on top and bottom of side panels remain in place See Figure 9 1 NOTE When replacing side and back panels to optional sets the original refractory hearth brick may be used with those sets or taken out for bare metal floor ACCENT LIGHT KIT MONAL If you are installing the accent light kit Model MONAL see the installation instructions provided with the kit...

Page 19: ...ct Information NOTES Monessen a brand of Hearth Home Technologies 7571 215th Street West Lakeville MN 50044 www monessenhearth com 22 Monessen LCUF32 36 42 Installation and Operating Manual 4607 900 Rev D 3 21 ...

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