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Installation Manual

Installation and Setup

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

OWNER:  Retain this manual for future reference.

VENT FREE FIREBOX

Model(s):

NOTICE: 

DO NOT

 discard this manual!

• 

DO NOT

 store or use gasoline or other 

flammable 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 

combustibles as specified. Failure to com

-

ply 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.

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.

ACUF32-BD, ACUF32-GD

ACUF36-BD, ACUF36-GD

ACUF42-BD, ACUF42-GD

HOT SURFACES

Firebox  surfaces  are  hot  during 

operation AND cool down.

Hot surfaces will cause burns.

• 

DO NOT

 touch firebox until it is cooled

•  NEVER allow children to touch firebox

•  Keep children away

•  CAREFULLY SUPERVISE children in same room as firebox.

•  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.

DANGER

FOR USE ONLY WITH A LISTED GAS-FIRED UNVENTED DECO-

RATIVE ROOM HEATER NOT TO EXCEED 40,000 BTU/H.

DO NOT BUILD A WOOD FIRE.

1

Monessen • ACUF32/36/42 Installation Manual • 4136-901 • Rev A • 01/21

Summary of Contents for ACUF32-BD

Page 1: ...ecorative 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 ACUF32 BD ACUF32 GD ACUF36 BD ACUF36 GD ACUF42 BD ACUF42 GD HOT SURFACES Firebox surfaces are hot during operation AND cool down Hot surfaces will cause burns DO NOT touch firebox until it is cooled...

Page 2: ...rations 5 B Tools and Supplies Needed 5 C Inspect Firebox and Components 5 3 Firebox Dimensions A Firebox Dimensions 6 B Hearth Dimensions 7 C Framing Dimensions 8 D Clearance to Combustibles 9 E Constructing the Appliance Chase 10 4 Firebox Preparation A Securing and Leveling the Firebox 11 B Installing Optional Outside Air Kit s 11 5 Electrical Information A Wiring Requirements 12 B Wiring the J...

Page 3: ...he installation is complete __________________________ by ______________________on _________ Firebox Install Section s 3 4 Verified clearances to combustibles Firebox is leveled and secured Outside Air Kit Installed Optional Electrical Section 5 Unswitched power 110 120 VAC provided to the firebox Gas Section 6 Proper fuel type Leak check performed and inlet pressure verified Finishing Section 7 C...

Page 4: ...al which will not ignite and burn Such materials are those consisting entirely of steel iron brick tile concrete slate glass or plasters or any combination thereof Materials that are reported as passing ASTM E 136 Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750 ºC shall be considered non combustible materials E Combustible Materials Specification Materials made of ...

Page 5: ...ric drill and bits Safety glasses Reciprocating saw Caulking material 300ºF minimum continuous exposure rating Note Refer to the installation instructions provided with the log set for items required for log set installation Hearth Home Technologies disclaims any responsibility for and the warranty will be voided by the following actions Installation and use of any damaged firebox or system compon...

Page 6: ... 76 mm 34 in 864 mm A 20 in 508 mm 15 7 8 in 403 mm 5 3 4 in 146 mm 5 3 4 in 146 mm 15 7 8 in 403 mm 2 in 51 mm 7 3 4 in 197 mm 2 in 50 mm 9 3 8 in 238 mm 32 36 42 A 32 in 813 mm 36 in 914 mm 42 in 1067 mm B 38 in 965 mm 42 in 1067 mm 48 in 1219 mm Gas Access Above Hearth Outside Air Electrical Access Wall Switch Strain Relief Outside Air Gas Access Above Hearth Gas Access Below Hearth 6 Monessen ...

Page 7: ...ons Model A B C D E ACUF32 28 7 8 in 15 in 20 3 8 in 25 1 2 in 22 5 8 in ACUF36 32 7 8 in 15 in 24 3 8 in 25 1 2 in 22 5 8 in ACUF42 38 7 8 in 15 in 30 3 8 in 25 1 2 in 22 5 8 in B Hearth Dimensions 7 Monessen ACUF32 36 42 Installation Manual 4136 901 Rev A 01 21 ...

Page 8: ...l installation may vary due to individual design preference Figure 3 3 Framing Dimensions A 5 8 in B F E D D 5 8 in C MODEL A B C D E F ACUF32 38 1 2 in 34 1 4 in 19 3 4 in 47 1 4 in 66 3 4 in 33 1 2 in ACUF36 42 1 2 in 50 in 70 3 4 in 36 in ACUF42 48 1 2 in 54 1 4 in 76 3 4 in 38 1 2 in Note Add 1 2 inch to width A and 1 4 inch to height B dimensions when using optional trim kit to finish the ins...

Page 9: ...learances to Combustibles Location should be out of high traffic or windy or drafty areas DO NOT INSTALL WHERE CURTAINS FURNITURE CLOTHING OR OTHER FLAMMABLE OBJECTSARE LESS THAN 36 FROM FRONT OF FIREBOX Never obstruct the front opening of the vent free firebox or restrict the flow of combustion and ventilation air 0 in to back 0 in to side 0 in Drywall Combustible flooring may be installed next t...

Page 10: ...eps Chases should be constructed in the manner of all outside walls of the home to prevent cold air drafting problems The chase should not break the outside building envelope in any manner Walls ceiling base plate and cantilever floor of the chase should be insulated Vapor and air infiltration barriers should be installed in the chase as per regional codes for the rest of the home Additionally in ...

Page 11: ...ioning and Securing of Firebox B Installing Optional Outside Air Kit s Figure 4 2 Optional Outside Air Kit s 4 Firebox Preparation Note The outside air kit is an optional accessory that can be used to bring in fresh air Use of the air kit is not required for operation unless specified by local codes CAUTION Risk of cuts abrasions flying debris Wear protective gloves and safety glasses during insta...

Page 12: ...utside of the firebox However for ease of installation it is recommended that the junction box be wired from outside of the firebox If the junction box is wired from OUTSIDE firebox Remove the screw attaching the junction box cover to the outer shell Pull junction box cover out to disengage it from the outer shell See Figures 5 1 Figure 5 1 Junction Box Cover Removal Install electrical wires from ...

Page 13: ...EMPERATURE SENSOR FAN CONTROL MOUNTED IN FIREBOX F F F F JUNCTION BOX WIRE HARNESS M M F F F F M M WIRE HARNESS M F LIGHT SOCKET ASSEMBLY F F POWER CORD LIGHT CONTROL MOUNTED IN FIREBOX BLK GRN WHT 13 Monessen ACUF32 36 42 Installation Manual 4136 901 Rev A 01 21 ...

Page 14: ...F F M M WIRE HARNESS F F POWER CORD LIGHT CONTROL MOUNTED IN FIREBOX BLK GRN WHT M F LIGHT SOCKET ASSEMBLY KNOCKOUT Note Wires supplied from remote wall box loca ons to pass through provided knockout in face of junc on box Figure 5 5 Wiring Diagram Remote Fan Control 14 Monessen ACUF32 36 42 Installation Manual 4136 901 Rev A 01 21 ...

Page 15: ...14 2 MINIMUM WHT BLK BLK WHT LIGHT CONTROL MOUNTED IN REMOTE WALL BOX M F LIGHT SOCKET ASSEMBLY Note Wires supplied from remote wall box loca ons to pass through provided knockout in face of junc on box KNOCKOUT Figure 5 6 Wiring Diagram Remote Light Control 15 Monessen ACUF32 36 42 Installation Manual 4136 901 Rev A 01 21 ...

Page 16: ...URE SENSOR JUNCTION BOX WIRE HARNESS M M F F M F LIGHT SOCKET ASSEMBLY F F POWER CORD BLK GRN WHT Note Wires supplied from remote wall box loca ons to pass through provided knockout in face of junc on box KNOCKOUT Figure 5 7 Wiring Diagram Remote Fan and Light Controls 16 Monessen ACUF32 36 42 Installation Manual 4136 901 Rev A 01 21 ...

Page 17: ... appliance IMPORTANT Install manual shut off valve equipment shutoff valve in an accessible location The manual shut off valve is for turning on or shutting off the gas to the firebox Fire Risk Explosion Hazard High pressure will damage valve Disconnect gas supply piping BEFORE pressure testing gas line at test pressures above 1 2 psig Close the manual shutoff valve BEFORE pressure testing gas lin...

Page 18: ...will withstand temperatures up to 190 F B Mantel and Wall Projections WARNING Risk of Fire Comply with all minimum clear ances as specified Combustible Noncombustible Mantels Figure 7 1 Minimum Vertical and Maximum Horizontal Dimensions of Combustible and Noncombustible Note Mantel Measurement is taken from top of the firebox opening NOT the top of the unit Reducing non combustible mantel and or m...

Page 19: ...ly decorative fronts certified for use with this firebox model may be used Contact your dealer for a list of deco rative fronts that may be used Minimum Side Wall Unit Gray area is combustible material White area is non combustible material only 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 9 00 6 00 9 00 19 Monessen ACUF32 36 42 Installation Manual 4136 901 Rev A 01 21 ...

Page 20: ...odel actual TV temperatures should be validated at the time of each installation TVs should not be used in situations where the actual TV temperature exceeds the manufacturers maximum allowable operating temperatures identified in the TV s technical specifications Contact the TV s manufacturer directly if you cannot locate this information or have questions regarding the information 3 Mantel heigh...

Page 21: ...1 on each end slide hood into position and secure See Figure 8 1 Figure 8 1 WARNING Risk of Fire The firebox hood must not be modified or replaced with a hood that may be provided with the vent free appliance D Adjustable Firebox Supports This firebox is provided with adjustable supports to allow for proper support of the firebox bottom and reduced sag ging caused by heavy concrete logs To adjust ...

Page 22: ... screws previously removed See Figure 8 6 Note The front edge of the firebox supports may be ad justed in or out if needed to provide the best support for the selected log set Once the firebox supports are prop erly located to provide maximum support the front edge MUST be secured with a minimum of 1 screw each The rear edge of the firebox supports should not be altered from the factory setting Fi...

Page 23: ... ID4 4 in Insulated Duct UD4 4 in Uninsulated Duct AKD Outside Air Kit IA32BCF IA36BCF A42BCF Contemporary Front Wire Ties Flexible Duct not supplied Outside Air Collar Outside Air Hood Outside Air Door MONAL VF Light Kit GFK 160VF Blower A32BGL A36BGL A42BGL Black Glass IAL32TK IAL36TK AL42TK Trim Kit 23 Monessen ACUF32 36 42 Installation Manual 4136 901 Rev A 01 21 ...

Page 24: ... Contact Information NOTES Monessen a brand of Hearth Home Technologies 7571 215th Street West Lakeville MN 55044 www monessenhearth com 24 Monessen ACUF32 36 42 Installation Manual 4136 901 Rev A 01 21 ...

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