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UNVENTED VENT-FREE
FIREBOXES
INSTALLATION AND OPERATING
INSTRUCTIONS
MODELS:
Universal Vent-Free Firebox
GCUF and GRUF Series
For use with a listed gas-fired
unvented decorative room heater
not to exceed 40,000 BTU/hr. Do
Not Build a Wood Fire.
Carefully review the instructions
supplied with the decorative type
unvented room heater for the mini-
mum fi replace size requirement.
DO NOT INSTALL AN APPLIANCE
IN THIS FIREBOX UNLESS THIS
FIREBOX MEETS THE MINIMUM
DIMENSIONS REQUIRED FOR
THE INSTALLATION.
If the information in this manual is not followed
exactly, a fire or explosion may result causing
If the information in this manual is not followed exactly,
property damage, personal injury or loss of life.
a fi re or explosion may result causing property damage,
personal injury or loss of life.
– Do not store or use gasoline or other fl ammable
– WHAT TO DO IF YOU SMELL GAS
– Installation and service must be performed by
READ AND SAVE THESE INSTRUCTIONS
WARNINGS
WARNINGS
WARNINGS
vapors and liquids in the vicinity of this or any
Do not store or use gasoline or other fl ammable
other appliance.
vapors and liquids in the vicinity of this or any
other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
• Do not touch any electrical switch; do not use any
any phone in your building.
phone in your building.
• Immediately call your gas supplier from a
• Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
neighbor's phone. Follow the gas supplier's
instructions.
instructions.
• If you cannot reach your gas supplier, call the
• If you cannot reach your gas supplier, call the
fi re department.
fi re department.
Installation and service must be performed by
a qualifi ed installer, service agency or the gas
a qualified installer, service agency or the gas
supplier.
supplier.

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Summary of Contents for Monessen Hearth GCUF Series

  • Page 1 UNVENTED VENT-FREE FIREBOXES INSTALLATION AND OPERATING INSTRUCTIONS MODELS: Universal Vent-Free Firebox GCUF and GRUF Series WARNINGS WARNINGS For use with a listed gas-fired WARNINGS unvented decorative room heater 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 Fire.
  • Page 2: Table Of Contents

    CONTENTS Important Safety Information ......... 3 Canopy Installation ..........13 Product Features ............5 Other Optional Equipment ........14 Forced Air Kit ............14 Before You Start .............5 Brass or Chrome Louvers ........14 General Installation Information ......6 Brass or Chrome Trim ..........14 Firebox External Dimensions .........6 Firebrick ...............14 Minimum Hearth Dimensions .........7 Optional Wide Canopy .........14...
  • Page 3: Important Safety Information

    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. •...
  • Page 4 IMPORTANT SAFETY INFORMATION 24. Never burn solid fuels in a fireplace where a unvented Continued from page 3 room heater is installed. 16. Keep room area clear and free from combustible materi- 25. Always have a fireplace screen in place when the appli- als, gasoline and other flammable vapors and liquids.
  • Page 5: Product Features

    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...
  • Page 6: General Installation Information

    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.
  • Page 7: Minimum Hearth Dimensions

    GENERAL INSTALLATION INFORMATION LOCATION OF FIREBOX MINIMUM HEARTH DIMENSIONS GCUF32C GCUF36C GCUF42C 29⅞" 34" 40" 13¼" 15¾" 15¾" 23⅜" 27⅜" 33⅜" 21⅞" 21⅞" 21⅞" 18" 17⅝" 17⅝-" Figure 2 - Minimum Hearth Dimensions LOCATION OF FIREBOX Carefully select the best location for installation of your vent-free firebox.
  • Page 8: Clearances And Height Requirements

    CLEARANCES HEIGHT REQUIREMENTS Ensure that minimum clearances shown in Figures 4 through 8 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.
  • Page 9 CLEARANCES HEIGHT REQUIREMENTS Mantel clearances: The canopy supplied with the 12" unit must be installed. If a combustible mantel is installed, it must meet the clearance requirements as 10" shown in Figure 6. However, if lower mantel height Combustible is desired, refer to page 14 for canopy options. material can 8"...
  • Page 10: Fireplace Framing

    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.
  • Page 11 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: GCUF32C with trim GCUF36C with trim GCUF42C with trim 37⅞" 41⅞" 47⅞" 35⅞" 35⅞" 35⅞" Figure 13 - Custom Cabinet The fi...
  • Page 12: Gas Line Installation

    GAS LINE INSTALLATION Plumbing connections should only be performed by a qualifi ed, licensed plumber. Main gas supply must be off when plumbing gas line to fi replace 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.
  • Page 13: Canopy Installation

    CANOPY INSTALLATION INSTALLING CANOPY A canopy is furnished with each firebox and MUST be installed for safe operation. See Figure 14. The firebox canopy must not be modifi ed or replaced with a canopy that may be provided with the unvented decorative room heater.
  • Page 14: Other Optional Equipment

    OPTIONAL EQUIPMENT FORCED AIR KIT (BLOTMC) If you are installing the forced air kit on GCUF or GRUF models, see the installation instructions provided with the kit for electrical wiring requirements, or the blower installation section. The firebox must be connected to main power supply at time of firebox installation.
  • Page 15: Illustrated Parts Breakdown

    ILLUSTRATED PARTS LIST ITEM DESCRIPTION GCUF32C GCUF36C GCUF42C Canopy 71D0023 71D0500 71D1000 Screen Panel 61D0001 61D0001 61D0003 Screen Rod 26D0138 26D0132 26D0133 Black Louver 26D0695 26D0697 26D0699 ACCESSORIES IN KITS Standard Brass Canopy BRCU32 BRCU36 BRCU42 Wide Brass Canopy BRC32 BRC36 BRC42 Brass Louver...
  • Page 16: Warranty

    Free Ceramic Fiber Logs, Catalytic Filter and Aluminized Burners. BASIC WARRANTY Monessen Hearth Systems (MHS) warrants the components and materials in your gas appliance to be free from manufacturing and material defects for a period of two years from date of installation. After installation, if any of the components manufactured by MHS in the appliance are found to be defective in materials or workmanship, MHS will, at its option, replace or repair the defective components at no charge to the original owner.

This manual is also suitable for:

Gruf series

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