UNVENTED GAS LOG HEATER OR VENTED DECORATIVE APPLIANCE INSTALLATION AND OPERATING INSTRUCTIONS MODEL: DST30 Natural Gas or Propane/LPG • Control Type: Milli-Volt WARNINGS 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. 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 7.
CONTENTS IMPORTANT SAFETY INFORMATION ............................................................................................................... 3 GETTING STARTED ............................................................................................................................................ 5 PRODUCT FEATURES AND SPECIFICATIONS ................................................................................................. 6 GENERAL INSTALLATION INFORMATION.................................
IMPORTANT SAFETY INFORMATION INSTALLER Please leave these instructions with the owner. OWNER Please retain these instructions for future reference. IMPORTANT WARNING 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 fire, burns, explosion or carbon monoxide poisoning.
IMPORTANT SAFETY INFORMATION Continued from page 3 14. Caution: Candles, incense, oil lamps, etc. produce combustion byproducts including soot. Vent-free appliances will not filter or clean soot produced by these types of products. In addition, the smoke and/or aromatics (scents) may be reburnt in the vent-free appliance which can produce odors. It is recommended to minimize the use of candles, incense, etc. while the vent-free appliance is in operation. 15. This is an unvented gas-fired heater.
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 • Plastic bag containing crushed volcanic rock • Installation/operating instructions • Four (4) anchoring screws • Ceramic Fiber logs • Four (4) self-tapping screws CAUTION The milli-volt controlled version of this heater is the only style designed to be operated with optional devices for ON/OFF functions.
PRODUCT FEATURES AND SPECIFICATIONS NATURAL GAS Milli-Volt Pressure Regulator Pressure Setting: Pilot Regulator: Gas Inlet Pressure: 3.5" w.c. 3.5" w.c. Max. 10 1/2" w. c. Min. 5" w.c. Model Number DST30NV Control MILLI-VOLT Gas Rate Max BTU/Hr Min BTU/Hr 38,000 24,000 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: Gas Inlet Pressure: 10" w.c. Max. 13" w.c. Min. 11" w.c.
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… American National Standards Institute, Inc. 1430 Broadway New York, NY 10018 or National Fire Protection Association, Inc.
GENERAL INSTALLATION INFORMATION Inside Wall Fireplace H W Figure 1 - Example of a Large Room with a See-Through Unit as 1/2 Wall Divider The following formula can be used to determine the maximum heater rating per the definition of unconfined space: BTU/Hr = (L1 + L2) Ft x (W) Ft x (H) Ft x 1000 50 Consider two connecting rooms with an open area between, with the following dimensions: L1 = 151/2 Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
This appliance is for installation only in a solid-fuel burning masonry or UL127 factory-built fireplace or in a listed ventless firebox enclosure. It has been design certified for these installations. Exception: DO NOT install this appliance in a factory-built fireplace that includes instructions stating it has not been tested or should not be used with unvented gas logs.
PLACEMENT IN A FIREPLACE WITH A RESTRICTIVE BARRIER IMPORTANT INFORMATION FOR THE INSTALLATION OF THIS GAS LOG SET The following are guidelines for placing a gas log set in a fireplace that has a restrictive barrier along the bottom front opening of the fireplace. Some examples of barriers are glass/screen door frames and sunken/recessed fireplaces. Height of Restriction (X) Minimum Depth of Fireplace/Firebox No restriction 201/4" 0.5 to 1.
WARNING CLEARANCES AND HEIGHT REQUIREMENTS The dimensions shown in Figures 4 through 10 and defined in the fireplace manufacturer's instructions are minimum clearances to maintain when installing this heater. When heater is installed into a ventless firebox, minimum clearances, as specified by the ventless firebox manufacturer, must be met. Follow these instructions carefully to ensure safe installation. Failure to follow instructions exactly can create a fire hazard.
CLEARANCES and HEIGHT REQUIREMENTS IMPORTANT: 1. If installing unit into an unvented firebox, minimum required clearances listed in the firebox installation manual must be met. 2. If installing unit into a vented firebox with a working damper, minimum clearances shown in Figures 5 through 10 must be met. 3. If installing unit into a vented firebox with a damper that is always open, no minimum clearances are required.
CLEARANCES and HEIGHT REQUIREMENTS Heat resistant material (minimum requirements) with wooden mantel or other combustible projection: To install the heater with a wooden mantel, shelf or other combustible projection above, first measure the heat resistant material shown in Figure 6, the refer to Table B.
CLEARANCES AND HEIGHT REQUIRMENTS 10" or less Heat Resistant Material 12" min. 28" Heater in Fireplace or Firebox Example: The bottom of the mantel may project from the wall a maximum of 10" at a minimum of 28" above the firebox. Figure 7 - Minimum Mantel Clearance with No Hood 7" 6" Figure 8 is an example of an unsafe mantel installation.
FLOOR CLEARANCE The gas log heater must be installed at least 5" above any combustible flooring material, such as carpeting or tile, which is closer than 14" to the base of the fireplace. The minimum distance must be maintained from the top surface of carpeting, tile, etc. Refer to Figure 9. OR, The gas log heater may be installed nearer to the floor if a minimum of 14" of noncombustible material such as slate or marble is installed between the base of the fireplace and the combustible flooring.
FIREPLACE PREPARATION BEFORE FULLY INSTALLING THE UNIT: • Turn OFF the gas supply to the fireplace or firebox. WARNING • Seal any fresh air vents and/or ash clean-out doors located on the floor or wall of the fireplace. If left unsealed, drafting may cause pilot outage or sooting. Use a heat resistant sealant. Do not seal the chimney flue damper.
WARNING INSTALLING VENTED APPLICATIONS The fireplace and gas logs function as a system. If the fireplace is spilling into the room (check with a match or a smoke stick), reposition the damper clamp until a positive draft is obtained by opening the damper. If negative pressure in home prevents having a positive draft, contact your dealer for assistance. WARNING PLACING AND SECURING APPLIANCE You must secure the gas log heater to the fireplace floor.
CONNECTING THE GAS CAUTION NOTICE: A qualified 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 sulfide limits, and where permitted by local codes. Gas piping system must be sized to provide minimum inlet pressure (Listed on Data Plate) at the maximum flow rate (BTU/Hr).
WARNING CHECKING GAS PRESSURE Connecting directly to an unregulated propane/LPG tank can cause an explosion. The heater gas inlet connection is a female 3/8" NPT at the valve. The inlet connection is on the right side of unit when facing the control. To connect from the opposite side, rotate unit 180° or route the pipe under the rear portion of the unit. When tightening up the joint to the valve, hold the valve securely to prevent movement.
ELECTRICAL WIRING (MILLI-VOLT) The milli-volt valve is a self-powered combination gas control THAT DOES NOT REQUIRE 110 VAC TO OPERATE. CAUTION Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.
ELECTRICAL WIRING (MILLI-VOLT) CONNECTING REMOTE RECEIVER THESE INSTRUCTIONS SUPERCEDE THE SECTION ENTITLED “HEARTH MOUNT” IN THE MILLI-VOLT HAND-HELD REMOTE INSTRUCTIONS SUPPLIED WITH THE REMOTE. 1. Unscrew 2 (two) screws located on the side of the frame. Unscrew 1 (one) screw located on top of the frame. Remove metal plate (Figure 16). 2. Cut cable to length (approximately 12") for placement in the fireplace. Remote Wire Connectors 3.
LOG PLACEMENT WARNING Before you begin — This unit is supplied with one ceramic fiber log. Do not handle the log with your bare hands. Always wear gloves to prevent skin irritation from ceramic fibers. After handling the log, wash your hands gently with soap and water to remove any traces of fibers. The positioning of the logs are critical to the safe and clean operation of this heater. Sooting and other problems may result if the logs are not properly and firmly positioned in the appliance.
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 flame must always be present when the heater is in operation. It should just touch the top of the thermocouple tip for natural. Refer to Figure 18 for correct pilot flame. If the pilot flame does not touch the thermocouple, then the main burner cannot function reliably.
CHECKING THE BURNER FLAME In normal operation at full rate after 15 minutes, the following flame appearances should be observed: Figure 20 - Correct Appearance of Flames The flames should be yellow and extend 3"-4" above the log top surfaces. The yellow flames should not contact the logs. OPERATING INSTRUCTIONS Avoid any drafts that alter burner flame patterns. Do not allow fans to blow directly into the fireplace. Do not place a blower inside the burn area of the firebox.
OPERATING INSTRUCTIONS WARNING FOR YOUR SAFETY READ BEFORE LIGHTING If you do not follow these instruction exactly, a fire or explosion may result causing property damage, personal injury or loss of life. 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.
OPERATING INSTRUCTIONS MILLI-VOLT CONTROL LIGHTING 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 27. 4. Turn gas control knob clockwise to the OFF position, set the thermostat to the lowest setting and turn ON/OFF switch to OFF position. 5.
OPERATING INSTRUCTIONS AND CLEANING AND SERVICING 1. 2. 3. 4. MATCH LIGHTING INSTRUCTIONS Remove any items necessary for easy access to the pilot (for example: logs, screens, etc.). 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. After control knob has been released and pilot stays lit, reinstall any items that were removed for pilot access.
WARNING TROUBLESHOOTING Turn appliance OFF and allow to cool before servicing. Only a qualified service person should service and repair the heater. Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM POSSIBLE CAUSE REMEDY When ignitor button is pressed, there is no spark at ODS/pilot. 1. Ignitor electrode positioned wrong. 2. Ignitor electrode is broken. 3. Ignitor electrode not connected to ignitor cable. 4. Ignitor cable pinched or wet. Keep ignitor cable dry. 5.
WARNING TROUBLESHOOTING If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and the heater may backfire when lit. If the gas quality or pressure is low, contact your local gas supplier immediately. OBSERVED PROBLEM POSSIBLE CAUSE REMEDY ODS/pilot lights, but flame goes out when control knob is released. 1. Control knob not fully pressed in. 2. Control knob not pressed in long enough. 1. Press in control knob fully. 2.
WARNING 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.
REPLACEMENT PARTS LIST REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER.
MONESSEN HEARTH SYSTEMS LIMITED LIFETIME WARRANTY POLICY LIFETIME WARRANTY 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.
