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VENT-FREE FIREPLACE
SYSTEMS
INSTALLATION AND OPERATING
INSTRUCTIONS
MODELS:
DFS32NVC, DFS32PVC
DFS36NVC, DFS36PVC
DFS42NVC, DFS42PVC
This is an unvented gas-fired
heater. It uses air (oxygen) from
the room in which it is installed.
Provisions for adequate combustion
and ventilation air must be provided.
Refer to page 10.
If the information in this manual is not followed
exactly, a fire 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
vapors and liquids in the vicinity of this or any
other appliance.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call the
fi re department.
a qualifi ed installer, service agency or the gas
supplier.
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Table of Contents
Related Manuals for Monessen Hearth DFS36NVC
Summary of Contents for Monessen Hearth DFS36NVC
- Page 1 VENT-FREE FIREPLACE SYSTEMS INSTALLATION AND OPERATING INSTRUCTIONS MODELS: DFS32NVC, DFS32PVC DFS36NVC, DFS36PVC DFS42NVC, DFS42PVC This is an unvented gas-fired heater. It uses air (oxygen) from the room in which it is installed. Provisions for adequate combustion and ventilation air must be provided.
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Page 2: Table Of Contents
CONTENTS Important Safety Information ... 3 Product Features ... 5 Operation ... 5 Specifi cations ... 7 Ignition Controls ... 7 Pilot ... 7 Thermal Generator ... 7 Getting Started ... 8 General Installation Information ... 9 Firebox Dimensions ... 9 Codes ... -
Page 3: Important Safety Information
INSTALLER Please leave these instructions with the appliance. Read these instructions carefully before installing or trying to operate this vent-free gas heater. • 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. - Page 4 IMPORTANT SAFETY INFORMATION Continued from page 3 17. Unvented gas heaters are a supplemental zone heater. They are not intended to be the primary heating appli- ance. 18. Unvented gas heaters emit moisture into the living area. In most homes of average construction, this does not pose a problem.
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Page 5: Product Features
PRODUCT FEATURES Screen On/Off Switch Piezo Control Knobs Figure 1 - Access to Controls This vent-free fireplace must be mounted on the floor or on the optional fireplace hearth. OPERATION This unvented gas heater requires no outside venting and burns cleanly with high heating efficiency. This zero-clearance unvented gas heater can be installed against (or recessed into) any wall that is accessible to a gas line. - Page 6 Pilot Regulator: 3.5" w.c. Gas Inlet Pressure: Max. 10 1/2" w. c. Min. 5" w.c. Model Number DFS32NVC DFS36NVC DFS42NVC PROPANE/LPG Note: An external regulator is required to reduce supply pressure to a maximum of 13" w.c. Milli-Volt Pressure Regulator Pressure Setting: 10" w.c.
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Page 7: Specifi Cations
IGNITION CONTROLS Piezo ignitor allows ignition of the pilot without the use of matches or batteries. Milli-Volt control has four (4) positions: - All gas to the gas logs is shut off at the valve. - Valve position to light/maintain a standing pilot. - Valve position to turn ON/OFF log set with remote switch/thermostat. -
Page 8: Getting Started
GETTING STARTED MAKE SURE YOU HAVE RECEIVED ALL PARTS: Check your packing list to verify that all listed parts have been received. You should have the following: • Unvented gas log grate/burner assembly • Installation/operating instructions • Ceramic fiber logs •... -
Page 9: General Installation Information
5. Plumb gas line. Refer to the “Connecting the Gas” section found in this manual. (Gas connections should only be performed by an experienced, licensed / certified tradesman). 6. Complete finish wall material and/or surround. DFS32NVC DFS36NVC DFS32PVC DFS36PVC 37" 32" 16"... -
Page 10: Codes
GENERAL INSTALLATION INFORMATION CODES Adhere to all local codes or, in their absence, the latest edition of THE NATIONAL FUEL GAS CODE ANSI Z223.1 or NFPA54 which can be obtained from: Do not install the heater: • Where curtains, furniture, clothing, or other fl ammable objects are less than 42" from the front of the heater. - Page 11 Figure 3 - Example of a Large Room with 1/2 Wall Divider The following formula can be used to determine the maximum heater rating per the definition of unconfined space: BTU/Hr = Consider two connecting rooms with an open area between, with the following dimensions: BTU/Hr = If there were a door between the two rooms the calculation would be based only on the room with the heater.
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Page 12: Removing Screen
GENERAL INSTALLATION INFORMATION REMOVING SCREEN Remove fireplace screen frame panel by pushing screen frame panel up and out. See Figure 4. Do not operate the unit without the screen frame panel and canopy installed. Fireplace Screen Figure 4 - Removing Fireplace Screen Frame Panel NOTE: Fireplace screen must be removed to access log box and to install canopy. -
Page 13: Location Of Fireplace
Carefully select the best location for installation of your unvented fireplace. The following factors should be taken into consideration. • Clearance to side wall, ceiling, woodwork and window or other combustibles. Refer to “Clearances and Height Require- ments” section on page 14. Minimum clearances to combustibles must be maintained. •... -
Page 14: Clearances And Height Requirements
CLEARANCES HEIGHT REQUIREMENTS The dimensions shown in Figures 7 and 8 and defi ned in the fi replace manufacturer's instructions are minimum clearances to maintain when installing this heater. Left and right clearances are determined when facing the front of the heater. Follow these instructions carefully to ensure safe installation. -
Page 15: Fireplace Framing
Figure 11 - Stud Location 71D0532 Unfi nished/rough framing surface Unfi nished/rough framing surface Figure 10- Inside Chase Installation Unfi nished/rough Figure 12- Recessed Installation framing surface FIREPLACE FRAMING DFS32NVC DFS36NVC DFS42NVC DFS32PVC DFS36NVC DFS42NVC 37¼" 41¼" 35" 35" 29" 32" "... -
Page 16: Clearances And Height Requirements
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: DFS32NVC DFS36NVC DFS32PVC DFS36PVC 37⅞" 41⅞" 35⅞" 35⅞" The fi replace must be installed giving full consideration to the clearance and height requirements identifi... -
Page 17: Connecting The Gas
NOTICE: A qualifi ed gas appliance installer must connect the heater to the gas supply. Consult all local codes. Use new black iron or steel pipe. Internally tinned copper or copper tubing can be used per National Fuel Code, section 2.6.3, providing gas meets hydrogen sulfi de limits, and where permitted by local codes. -
Page 18: Checking Gas Pressure
CHECKING GAS PRESSURE When tightening up the joint to the valve, hold the valve securely to prevent movement. Test all gas joints from the gas meter to the heater valve for leaks using a gas analyzer or soap and water solution after completing connection. -
Page 19: Electrical Wiring (Milli-Volt)
The milli-volt valve is a self-powered combination gas control THAT DOES NOT REQUIRE 110 VAC TO OPERATE. Wall Switch On/Off Switch TP/TH = 2 CONNECTING OPTIONAL WALL SWITCH 1. Use 18 awg, two-wire cable, 15 feet maximum length. 2. At one end of the cable, connect both wires to the wall switch or thermostat. At the other end, connect one wire to TP/TH and one wire to TH, or connect the wall switch/thermostat to the two male (0.25") terminals on the left side of the unit. -
Page 20: Connecting Remote Receiver
ELECTRICAL WIRING CONNECTING REMOTE RECEIVER THESE INSTRUCTIONS SUPERCEDE THE SECTION ENTITLED “HEARTH MOUNT” IN THE MILLI-VOLT HAND-HELD REMOTE INSTRUCTIONS SUPPLIED WITH THE REMOTE. 1. Remove cover on control panel to show opening for remote receiver. See Figure 18. 2. Connect the remote connectors located in the unit. 3. -
Page 21: Log Placement
Before you begin — This unit is supplied with six (6) ceramic fiber logs. Do not handle these logs with your bare hands. Always wear gloves to prevent skin irritation from ceramic fibers. After handling the logs, wash your hands gently with soap and water to remove any traces of fibers. - Page 22 LOG PLACEMENT 3. Place left base log (#3) on two pins on left side of grate. See Figure 21. Left Base Log (#3) Pins Figure 21 - Installing Left Base Log (#3) Right Front Log (#4) 4. Place right front log (#4) on two pins on bottom right side of grate. See Figure 22.
- Page 23 LOG PLACEMENT 5. Place right end of left top log (#5) on bottom center grate pin. Place left end of left top log (#5) on top of the left base log. See Figure 23. Left Top Log (#5) Bottom Center Pin Figure 23 - Installing Left Top Log (#5) 71D0532...
- Page 24 LOG PLACEMENT 7. Place right top log (#6) on two pins to the left of right base log. See Figure 25. PLACING ROCK WOOL After installing logs, place TPB-RW (Rock Wool) in dime-size pieces evenly across the burner surface in between the logs. Do not add additional rock wool.
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Page 25: Flame Appearance
FLAME APPEARANCE Flames from the pilot, front and rear burner should be visually checked as soon as the heater is installed. In addition, periodically check the flames visually during operation. CHECKING THE PILOT FLAME The pilot fl ame must always be present when the heater is in operation. It should just touch the top of the thermo- couple tip for natural. -
Page 26: Checking The Burner Flame
CHECKING THE BURNER FLAME In normal operation at full rate after 15 minutes, the following fl ame appearances should be observed: Figure 29 - Correct Appearance of Rear Flames of Charred Timber Burner will have a random pattern of yellow flames as shown in Figure 29. There should be glowing embers on the front burner. -
Page 27: Operating Instructions
FOR YOUR SAFETY READ BEFORE LIGHTING A. This appliance is equipped with an ignition device which automatically lights the pilot. Do not try to light the unit by hand. B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor. -
Page 28: Milli-Volt Control Lighting Instructions
OPERATING INSTRUCTIONS 1. STOP! Read the safety information label. 2. Make sure the manual shutoff valve is fully open. 3. This gas log set is equipped with an ignition device (piezo) which automatically lights the pilot. If piezo ignitor does not light the pilot, refer to instructions for “Match Lighting Instructions,” page 29. 4. -
Page 29: Match Lighting Instructions
OPERATING INSTRUCTIONS MATCH LIGHTING INSTRUCTIONS 1. Remove any items necessary for easy access to the pilot (for example: logs, screens, etc.). 2. Follow appropriate lighting instructions found previously. Instead of pushing and releasing the piezo button, light a match and hold the flame to the end of the pilot and ignite the pilot. 3. -
Page 30: Blower And Other Optional Equipment
BLOWER AND OTHER OPTIONAL EQUIPMENT OPTIONAL EQUIPMENT FORCED AIR KIT If you are installing the forced air kit, Model BLOTMC, 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 31: Illustrated Parts Breakdown
REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER. CHARRED TIMBER LOGS Item Description Rear Log Right Base Log Left Front Base Log Right Front Log Left Top Log Right Top Log 71D0532 ILLUSTRATED PARTS BREAKDOWN 70D0031 70D0032 70D0033 70D0037 70D0065 70D0034 Failure to position the parts in accordance with these diagrams or failure to use only parts specifi... -
Page 32: Heater
ILLUSTRATED PARTS BREAKDOWN Failure to position the parts in accordance with these diagrams or failure to use only parts specifi cally approved with this heater may result in property damage or personal injury. 71D0532... -
Page 33: Replacement Parts List
REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER. BURNER ASSEMBLY Item ACCESSORIES SOLD SEPARATELY 71D0532 Piezo Ignitor Piezo Wire Burner Control Valve Injector ODS Pilot Assembly On/Off Switch Pilot Regulator Hi/Lo Knob Pilot On/Off Knob Control panel Description Wall Thermostat Kit Remote (On/Off) Thermostat Remote Remote Receiver Cover Ember... -
Page 34: Cabinet
ILLUSTRATED PARTS BREAKDOWN Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this appliance may result in property damage or personal injury. 71D0532... - Page 35 REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER. Item Description Standard Features Canopy Screen Assembly Black Trim Kit Feature Options Brass Louver Kit Pewter Louver Kit Black Louver Blower with Rheostat Accessories Curved Design Brass Trim Curved Design Pewter Trim Curved Design Black Trim Brass Trim Kit Pewter Trim Kit Cottage Red Firebrick...
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Page 36: Troubleshooting
TROUBLESHOOTING Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM When ignitor button is pressed, there is no spark at ODS/pilot. Appliance produces unwanted odors. Appliance shuts off during use. Gas odor even when control knob is in OFF position. When ignitor button is pressed, there is spark at ODS pilot, but no ignition. - Page 37 If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and the heater may backfi re when lit. If the gas quality or pressure is low, contact your local gas supplier immediately. OBSERVED PROBLEM ODS/pilot lights, but flame goes out when control knob is released.
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Page 38: Trim Installation
TRIM INSTALLATION 1. Remove top and bottom louver assemblies by disengaging hooks. Pull assemblies up and away from unit. See Figure 33. 2. Remove canopy by removing screws and pulling canopy away from unit. See Figure 34. 3. Set bottom trim kit piece in place on bottom of face. Bottom piece will be held in place by the side pieces. See Figure 34. - Page 39 TRIM INSTALLATION 6. Hold trim kit together by gripping the top left and right corners. Tilt trim kit away from you and into place snugly against unit. Tighten screws installed in step 4. Figure 37 Figure 38 Figure 36 7. Secure the top trim piece to unit by installing supplied screws.
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Page 40: Using Optional Outside Air Kit
FOR USE OF 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. - Page 41 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 1.
- Page 42 FOR USE OF OPTIONAL AK-4 OUTSIDE AIR KIT MODEL AK-4 COMBUSTION AIR ASSEMBLY 7. If the duct is the insulated type, push the insulation back from one end of the duct approximately 2". See Figure 49. 8. Slip the exposed end of the duct over the starting collar on the fi replace. 9.
- Page 43 NOTES 71D0532...
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Page 44: 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.