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MAGNUM
UNVENTED
VENT-FREE
FIREBOXES
INSTALLATION AND
OPERATING INSTRUCTIONS
MODELS:
MCUF36D and MCUF42D SERIES
WW ARNINGS ARNINGS
For use with a listed gas-fired
unvented decorative room heater WARNINGS
If the information in this manual is not followed
not to exceed 40,000 BTU/hr. Do
exactly, a fire or explosion may result causing
not build a wood fi re.
If the information in this manual is not followed exactly,
property damage, personal injury or loss of life.
a fi re or explosion may r
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CONTENTS Important Safety Information ................................. 3 Canopy Installation ................................................13 Product Features ......................................................5 Optional Equipment ...............................................14 Before You Start .....................................................5 Forced Air Kit .......................................................14 Brass or Chrome Trim ..........................................14
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IMPORTANT SAFETY INFORMATION INSTALLER OWNER Please leave these instructions with the appliance. Please retain these instructions for future reference. IMPORTANT Read these instructions carefully before installing or trying to operate a vent-free gas heater in this fi rebox. • Any change to this heater or its controls can be dangerous. • Improper installation or use of the heater can cause serious injury or death from fi re, burns, explosion or carbon monoxide poisoning. • Do not allow fans to b
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IMPORTANT SAFETY INFORMATION Continued from page 3 24. Never burn solid fuels in a fireplace where a unvented room heater is installed. 16. Keep room area clear and free from combustible materi- als, gasoline and other flammable vapors and liquids. 25. Always have a fireplace screen in place when the appli- ance is in operation, and unless other provisions for 17. Unvented gas heaters are a supplemental zone heater. combustion air are provided, the screen shall have an They are not intended
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PRODUCT FEATURES Do not attempt to burn solid wood fuels, vented gas log sets, or any other combustible in this unvented fi rebox. Also, do not install a vent-free gas log set in this fi rebox if the minimum clearance and height requirements of the log set are too large for the fi rebox. The MCUF36D and MCUF42D Series are vent-free fireboxes. They feature a self contained heat-circulating system. This installation manual will enable you to obtain a safe, efficient and dependable installation
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GENERAL INSTALLATION INFORMATION In planning the installation for the appliance it is necessary to determine where the unit is to be installed and whether optional accessories are desired. Gas supply piping should also be planned. The following steps represent the normal sequence of installation. Each installation is unique, however, and might require a different sequence. 1. Position firebox prior to framing or into prepared framing. 2. Field wire main power supply to models with fan kit.
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GENERAL INSTALLATION INFORMATION AND LOCATION OF FIREBOX MINIMUM HEARTH DIMENSIONS MCUF36D-F MCUF36D-R MCUF42D-F MCUF42D-R 1 3 1 3 A 26 /4" 25 /4" 32 /4" 31 /4" 3 3 B 15" 14 /4" 15" 14 /4" 5 1 5 1 C 32 /8" 32 /8" 38 /8" 38 /8" D 25" 25" 25" 25" 1 1 1 1 E 20 /2" 20 /2" 20 /2" 20 /2" Figure 2 - Minimum Hearth Dimensions LOCATION OF FIREBOX Carefully select the best location for installation of your vent-free firebox. The following factors should be taken into consideration: • Clearance
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42" Minimum 6" 6" Minimum Minimum CLEARANCES AND HEIGHT REQUIREMENTS Ensure that minimum clearances shown in Figures 4 through 7 are maintained. Left and right clearances are determined when facing the front of the firebox. Follow these instructions carefully to ensure safe installation. Failure to follow these requirements may create a fire hazard. 1. Sidewall clearances: The clearance from the inside of the appliance to any combustible wall should not be less than 6". See Figure 4. 2.
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CLEARANCES AND HEIGHT REQUIREMENTS 5. Mantel clearances: The canopy supplied with the unit must be installed. If a combustible mantel is installed, it must meet the clearance requirements as shown in Figure 7A. However, if lower mantel height is desired, see page 15 and Figure 7B. 12" 10" 8" 6" 23" 21" 1 2 /2" 19" 16" 12" Figure 7A - Mantel Clearances Figure 7B - Mantel Clearances for Wide Profi le Canopy Only. WALL FIREPLACE COMBUSTIBLE MATERIAL AREA HOOD TOP VIEW Figure 8- Mantel Clearance
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FIREPLACE FRAMING Firebox framing can be built before or after the appliance is set in place. Construct firebox framing following Figures 9 through 12 and the chart below for your specific installation requirements. See Figure 1 on Page 6 for firebox dimensions. The framing headers may rest on the top of 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, ti
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FIREPLACE FRAMING When finishing a custom cabinet, mantel, or other built-in enclosure, the opening size to accommodate the fireplace with trim installed is as follows: MCUF36D MCUF42D K with Trim with Trim 3 K 42" 47 /4" 1 1 J 38 /8" 38 /8" J Figure 13 - Custom Cabinet The fi replace must be installed giving full consideration to the clearance and height requirements identifi ed in this manual. 1. Bend out the nailing flanges located on each side of the firebox. 2. Slide the firebo
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GAS LINE INSTALLATION Plumbing connections should only be performed by a qualified, licensed plumber. Main gas supply must be off when plumbing gas line to fireplace or performing service. Consult all local codes. All gas piping must be installed to comply with local codes, or in the absence of local codes, with the latest edition of the National Fuel Gas Code ANSI Z223.1/NFPA54. Remove the baseplate for ease of gas line installation. Remove three (3) screws along the front edge of the basepl
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CANOPY INSTALLATION INSTALLING CANOPY A canopy is furnished with each firebox and MUST be installed for safe operation. See Figure 15. The firebox canopy must not be modifi ed or replaced with a canopy that may be provided with the unvented decorative room heater. 1. Remove the three (3) screws from the top front frame assembly. Also remove the two (2) screws on the side frames. See Figure 15. 2. Align the canopy with the holes in the top frame. 3. Replace the screws previously remo
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OPTIONAL EQUIPMENT BRASS OR CHROME TRIM Optional brass trim kits can be used with unit when installed as a free standing fireplace with wood surround. OPTIONAL WIDE CANOPY The optional wide canopy can be installed. See installation instructions provided with kit. FORCED AIR KIT (BLOTMC) If you are installing the forced air kit, Model BLOTMC, on MCUF36D or MCUF42D models, see the installation instructions provided with the kit for electrical wiring requirements, or the blower installation sect
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ILLUSTRATED PARTS LIST ITEM DESCRIPTION QTY MCUF36D MCUF42D 1 Canopy 1 71D0500 71D1000 2 Screen Panel 2 26D4562 26D45622 3 Screen Rod 2 26D0132K 26D0133K ACCESSORIES IN KITS 1 Standard Brass Canopy 1 BRCU36 BRCU42 1 Wide Brass Canopy 1 BRC36 BRC42 4 Blower w/ Rheostat 1 BLOTMC BLOTMC 5 Brass Trim Curved Design 1 BRTKM36 BRTKM42 5 Pewter Trim Curved Design 1 PWTKM36 PWTKM42 5 Black Trim Curved Design 1 BLTKM36 BLTKM42 6 Outside Air Kit* 1 AK-4 AK-4 *Not illustrated, see foll
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USING OPTIONAL AK-4 OUTSIDE AIR KIT COMBUSTION AIR 1. Locate combustion air assembly at an exterior location which is not likely to be accidentally blocked in any manner. Locate assembly a min. of 12" above the snow line to prevent blockage by snow accumulation. 2. Never mount the combustion air inlet assembly in a garage or storage area where combustible fumes such as gasoline might be drawn into the fi replace. 3. Combustion air can be drawn from the crawl space under a house when an adequat
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USING OPTIONAL AK-4 OUTSIDE AIR KIT The use of outside air for combustion is optional unless required by building codes. It is only necessary to supply outside combustion air to one side of the fi replace. Use the model AK4 combustion air kit. MODEL AK-4 COMBUSTION AIR ASSEMBLY DO NOT remove the 1. Remove the cover plate from the 4" outlet opening location on the left or cover if the outside air right outside of the fi replace. will not be connected. 2. Place the insulation ring between the A
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USING OPTIONAL AK-4 OUTSIDE AIR KIT MODEL AK-4 COMBUSTION AIR ASSEMBLY (CONTINUED) Approximately 7. If the duct is the insulated type, push the insulation back from one end of 2" the duct approximately 2". See Figure 24. Duct Connector 8. Slip the exposed end of the duct over the starting collar on the fi replace. 9. Using the sheet metal screws provided, secure the duct end to the collar attached to the fi replace. 10. Nail or screw the combustion air assembly to the surface of the wall. Ins
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NOTES 26D4720 19
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MONESSEN HEARTH SYSTEMS LIMITED LIFETIME WARRANTY POLICY The following components are warranted for life to the original owner, subject of proof of purchase: Firebox, Combustion Chamber, Heat Exchanger, Grate, and Stainless Steel Burners. FIVE YEAR WARRANTY The following components are warranted for 5 years to the original owner, subject of proof of purchase: Vent Free Ceramic Fiber Logs, Catalytic Filter and Aluminized Burners. BASIC WARRANTY Monessen Hearth Systems (MHS) warrants the compon
