Vented/Unvented Gas Log Set Installation and Operating Instructions Models: NBST27 WARNING 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 flammable 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 touch any electrical switch; do not use any phone in your building.
NBST27 Unvented Gas Log Set Important Safety Information..............................3 Codes..............................................................4 Features and Specifications................................5 Check Parts.....................................................5 Items Needed for INstallation..........................5 Gas Pressures.................................................5 Gas Specifications...........................................5 Pilot/ODS...................................
NBST27 Unvented Gas Log Set IMPORTANT SAFETY INFORMATION INSTALLER Please leave these instructions with the appliance. OWNER Please retain these instructions for future reference. IMPORTANT: Read these instructions carefully before installing or trying to operate this vent-free gas heater. WARNING: • 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.
NBST27 Unvented Gas Log Set 18. Unvented gas heaters are a supplemental zone heater. They are not intended to be the primary heating appliance. 19. Unvented gas heaters emit moisture into the living area. In most homes of average construction, this does not pose a problem. In houses of extremely tight construction, additional mechanical ventilation is recommended. 20. During manufacturing, fabricating and shipping, various components of this appliance are treated with certain oils, films or bonding agents.
NBST27 Unvented Gas Log Set FEATURES AND SPECIFICATIONS CHECK PARTS: Verify contents to ensure you have received all parts. You should have the following: • • • • • • • • Unvented Gas Log Burner Assembly Crushed Volcanic Rock, 3 bags Anchoring Screws, 2 Ceramic Fiber Logs Rock wool Flickering Bright Embers, 1 bag On/Off Log Switch Assembly Installation/Operating Instructions The following options may be used with the milli-volt controlled heater. These options are not packaged with the log set.
NBST27 Unvented Gas Log Set FIREPLACE AND HEARTH DIMENSIONS WARNING This appliance is for installation only in a solid-fuel burning masonry or UL127 factory-built fireplace, vent free appliance, or in listed ventless firebox enclosure. It has been design certified for these installations. Exception: DO NOT install this appliance in a factorybuilt fireplace that includes instructions stating it has not been tested or should not be used with unvented gas logs.
CLEARANCE AND HEIGHT REQUIREMENTS WARNING The dimensions shown in Figures 3 through 9 and defined in the fireplace 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. 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.
NBST27 Unvented Gas Log Set CLEARANCE 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 5, then refer to Table B. 10" or Less 28" Heat Resistant Material 12" Min.
FLOOR CLEARANCES NBST27 Unvented Gas Log Set The gas log heater must be installed at least 3/4" 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.
NBST27 Unvented Gas Log Set WARNING Before installing in a solid fuel burning fireplace, The chimney flue and firebox must be cleaned of soot, creosote, ashes and loose paint by a qualified chimney cleaner. WARNING This appliance is for installation only in a solid fuel burning fireplace (masonry fireplace or manufactured fireplace) with a working flue and constructed of noncombustible material.
NBST27 Unvented Gas Log Set SECURE APPLIANCE WARNING 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. PLACE AND SECURE APPLIANCE 1. Center the gas log unit in the fireplace or firebox.
NBST27 Unvented Gas Log Set GAS AND VALVE CONNECTION WARNING WARNING 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). Undue pressure loss will occur if the pipe is too small.
ELECTRICAL WIRING — MILLIVOLT NBST27 Unvented Gas Log Set WARNING Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. The Millivolt valve is a self-powered combination gas control THAT DOES NOT REQUIRE 110VAC TO OPERATE. CONNECTING OPTIONAL WALL SWITCH OR THERMOSTAT 1. Use 18 awg, two-wire cable, 15 feet maximum length. 2.
ELECTRICAL WIRING — MILLIVOLT NBST27 Unvented Gas Log Set CONNECT REMOTE RECEIVER 1. Set remote receiver. Refer to instructions included in the receiver kit. 2. Connect the two (20 1⁄4" female connectors to the TP/ TH and TH terminals on the control valve. NOTE: Do not allow wires touch grate or burner. NOTE: Heat reduces battery life. Protect the receiver and extend battery life by mounting receiver in wall or other location outside the fireplace.
LOG PLACEMENT NBST27 Unvented Gas Log Set The positioning of the logs is 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. Never add additional logs or embellishments such as pine cones, vermiculite or rock wool to the heater. Only use the logs and 2G-RW rock wool (for NB18), or 3G-RW rock wool (for NB24) supplied with the unit.
NBST27 Unvented Gas Log Set LOG PLACEMENT 3. Place log #3 on farthest right grate tine by aligning the ‘V’ notch in log with grate tine. The groove in the bottom of the log should sit on the filler bracket surrounding the pilot assembly. Figure 19 Log #3 Continue on Side B, valve on right as you face the fireplace. 6. Place log #6 on pilot end of burner by aligning the ‘V’ notch in bottom of log with the filler bracket surrounding the pilot.
FLAME APPEARANCE NBST27 Unvented Gas Log Set 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. CHECK 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 27 for correct pilot flame.
NBST27 Unvented Gas Log Set OPERATING INSTRUCTIONS 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. Ceiling fans may create drafts that alter flame patterns. Sooting and improper burning will result. During manufacturing, fabricating and shipping, various components of this appliance are treated with certain oils, films or bonding agents.
NBST27 Unvented Gas Log Set OPERATING INSTRUCTIONS MILLIVOLT 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 22. 4. Turn gas control knob clockwise to the OFF position and turn ON/OFF switch to OFF position. 5.
NBST27 Unvented Gas Log Set MAINTENANCE 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. After control knob has been released and pilot stays lit, reinstall any items that were removed for pilot access. 4.
NBST27 Unvented Gas Log Set TROUBLESHOOTING WARNING Turn off heater and allow to cool before cleaning. Disconnect electrical power before cleaning or servicing. NOTE: All troubleshooting items are listed in order of operation. PROBLEM When ignitor button is pressed, there is not 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.
NBST27 Unvented Gas Log Set PROBLEM TROUBLESHOOTING POSSIBLE CAUSE SOLUTION Control knob not fully pressed in. Press in control knob fully. Control knob not pressed in long enough. After ODS/pilot lights, keep control knob pressed in for 30 seconds. Manual shutoff valve not fully open. Fully open manual shutoff valve. Thermocouple connection loose at control valve. Hand tighten thermocouple connection until snug, then tighten 1⁄4 turn more.
NBST27 Unvented Gas Log Set REPLACEMENT PARTS 1a 1h 3 1c 1b 1d 1e 1g 1f 5 2 1i 1j 8 7 6 4 REF. QTY. NBST27NV NBST27PV Complete Log Set 1 81D3051 81D3051 1a. Log #1 1 81D3034 81D3034 1b. Log #2 1 81D3035 81D3035 1c. Log #3 1 81D3036 81D3036 1. DESCRIPTION 1d. Log #4 1 81D3037 81D3037 1e. Log #5 1 81D3038 81D3038 1f. Log #6 1 81D3039 81D3039 1g. Log #7 1 81D3040 81D3040 1h. Log #8 81D3041 81D3041 1i.
NBST27 Unvented Gas Log Set ACCESSORIES DESCRIPTION PART NUMBER Flex Connector Flexcon 30 Wall Switch and Wire MVWS Wall Thermostat Kit WT On/Off Remote RCB, RCMT, TLM, WMTD Thermostat Remote RCST, RCT, TLT, WWTD Remote Receiver Cover Ember RRCE Remote Receiver Cover Metal RRCM Log Switch with Wires ELSK Universal Andirons UAI9 Rock Wool EB-RW Flickering Bright Embers FBE-.
MASSACHUSETTS RESIDENTS ONLY NBST27 Unvented Gas Log Set Please read and follow these special requirements NOTE REGARDING VENTED PRODUCTS This product must be installed by a licensed plumber or gas fitter when installed within the Commonwealth of Massachusetts. 2. Approved Carbon Monoxide Detectors. Each carbon monoxide detector as required in accordance with the above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.
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 and Aluminized Burners.
