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Summary of Contents for MHSC NBST27NV
- Page 1 This Owner's Manual is provided and hosted by Appliance Factory Parts. MAJESTIC NBST27NV Owner's Manual Shop genuine replacement parts for MAJESTIC NBST27NV Find Your MAJESTIC Fireplace Parts - Select From 585 Models -------- Manual continues below --------...
- Page 2 Unvented Gas Log Heater Vented Decorative Appliance Installation Instructions Model: NBST27 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. – Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
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Page 3: Table Of Contents
NBST27 Unvented Gas Log Set CONTENTS Important Safety Information ......3 Electrical Wiring (Millivolt) ........14 Codes .............4 Optional Wall Switch or Thermostat .....14 Remote Receiver ..........15 Getting Started .............5 Checking System Operation ......15 Product Features and Specifications ....5 Log Placement ...........16 Gas Pressures ..........5 Rockwool and Ember Placement ....16 Gas Specifications ..........5... -
Page 4: Important Safety Information
NBST27 Unvented Gas Log Set IMPORTANT SAFETY INFORMATION OWNER INSTALLER Please retain these instructions for future reference. Please leave these instructions with the appliance. IMPORTANT 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. -
Page 5: Codes
NBST27 Unvented Gas Log Set IMPORTANT SAFETY INFORMATION 19. During manufacturing, fabricating and shipping, various components of this appliance are treated with certain Never connect unit to private (non-utility) oils, films or bonding agents. These chemicals are not gas wells. This gas is commonly known harmful but may produce annoying smoke and smells as wellhead gas. -
Page 6: Getting Started
• Crushed Volcanic Rock, 3 bags Max.Input Min. Input • Anchoring Screws, 2 Model Fuel Control BTU/h BTU/h • Ceramic Fiber Logs NBST27NV Nat. Millivolt 39,000 26,000 • Rock wool NBST27PV Millivolt 39,000 30,000 • Flickering Bright Embers, 1 bag •... -
Page 7: General Installation Information
NBST27 Unvented Gas Log Set GENERAL INSTALLATION INFORMATION ADEQUATE COMBUSTION AND VENTILATION AIR This heater shall not be installed in a confined space or unusually tight construction unless provi- sions are provided for adequate combustion and ventilation air. The National Fuel Gas Code, (ANSI Z223.1/NFPA 54), defines a confined space as a space whose volume is less than 50 cubic feet per 1,000 BTU per hour (4.8 m per kw) of the aggregate input rating of all appliances installed in that space. -
Page 8: Fireplace And Hearth Dimensions
NBST27 Unvented Gas Log Set FIREPLACE and HEARTH DIMENSIONS 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 factory-built fireplace that includes instructions stating it has not been tested or should not be used with unvented gas logs. -
Page 9: Clearances And Height Requirements
NBST27 Unvented Gas Log Set CLEARANCE 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. 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. - Page 10 NBST27 Unvented Gas Log Set CLEARANCE and HEIGHT REQUIREMENTS Heat resistant material (minimum requirements) with Figure 7 - 10” or Less wooden mantel or other combustible projection: Minimum Mantel Clearance with No Hood To install the heater with a wooden mantel, shelf or other combustible projection above, first measure the heat resis- 28”...
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Page 11: Floor Clearance
NBST27 Unvented Gas Log Set FLOOR CLEARANCES 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. -
Page 12: Fireplace Preparation
NBST27 Unvented Gas Log Set FIREPLACE PREPARATION 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. 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. - Page 13 NBST27 Unvented Gas Log Set VENTED APPLICATION INSTALLATION / SECURE APPLIANCE 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), reposi- tion the damper clamp until a positive draft is obtained by opening the damper.
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Page 14: Gas Line Connection
NBST27 Unvented Gas Log Set GAS LINE CONNECTION 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). -
Page 15: Electrical Wiring (Millivolt)
ELECTRICAL WIRING - MILLIVOLT NBST27 Unvented Gas Log Set 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 con- trol THAT DOES NOT REQUIRE 110VAC TO OPERATE. -
Page 16: Remote Receiver
ELECTRICAL WIRING - MILLIVOLT NBST27 Unvented Gas Log Set CONNECT REMOTE RECEIVER A. Complete Millivolt System Check (“A” Reading - Thermostat contacts CLOSED - Control 1. Set remote receiver. Refer to instructions included in knob “ON” - Main burner should turn ON) the receiver kit. -
Page 17: Log Placement
NBST27 Unvented Gas Log Set LOG PLACEMENT 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. -
Page 18: Log Placement
LOG PLACEMENT NBST27 Unvented Gas Log Set Log 1 LOG PLACEMENT Figure 19 - Begin on Side A, valve on left as Place Log #1 you face the fireplace. 1. Place log #1 on burner by aligning two (2) holes on bot- Control tom of log with two (2) pins Valve... - Page 19 NBST27 Unvented Gas Log Set LOG PLACEMENT Log #5 5. Place log #5 by placing rectangular notch on bottom of log onto matching rectangu- lar protrusion on log #2. Make sure ember or ‘burnt’ portion of log is facing center of burner.
- Page 20 NBST27 Unvented Gas Log Set LOG PLACEMENT 8. Place log #8 by aligning ‘V’ notch in bottom of log with the horizontal grate bar between tines as shown in Figure 17. Place the rect- angular notch on bottom of log onto rectangular protrusion on middle of log #1.
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Page 21: 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. -
Page 22: Operating Instructions
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. -
Page 23: Millivolt Control Lighting Instructions
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 23. -
Page 24: Match Lighting Instructions
NBST27 Unvented Gas Log Set OPERATING INSTRUCTIONS and 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. -
Page 25: Troubleshooting
NBST27 Unvented Gas Log Set TROUBLESHOOTING NOTE: All troubleshooting items are listed in order of Turn off heater and allow to cool before operation. cleaning. Disconnect electrical power before cleaning or servicing. Problem Possible Cause Solution When ignitor button is 1. - Page 26 NBST27 Unvented Gas Log Set TROUBLESHOOTING Problem Solution Possible Cause ODS/pilot lights, but flame 1. Press in control knob fully. 1. Control knob not fully pressed in. goes out when control 2. After ODS/pilot lights, keep control 2. Control knob not pressed in long knob is released.
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Page 27: Replacement Parts
NBST27 Unvented Gas Log Set REPLACEMENT PARTS Ref. Description Qty. NBST27NV NBST27PV Complete Log Set 81D3033 81D3033 Log #1 81D3034 81D3034 Log #2 81D3035 81D3035 Log #3 81D3036 81D3036 Log #4 81D3037 81D3037 Log #5 81D3038 81D3038 Log #6 81D3039... -
Page 28: Accessories
NBST27 Unvented Gas Log Set ACCESSORIES Description Part Number Flex Connector Flexcon 30 Wall Switch and Wire MVWS Wall Thermostat Kit 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... - Page 29 NBST27 Unvented Gas Log Set 81D3032...
- Page 30 NBST27 Unvented Gas Log Set 81D3032...
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Page 31: Requirements In Massachusetts
Massachusetts Residents Only — Please read and follow these special requirements 2. Approved Carbon Monoxide Detectors. Each carbon NOTE REGARDING VENTED PRODUCTS monoxide detector as required in accordance with the above This product must be installed by a licensed plumber or gas fitter provisions shall comply with NFPA 720 and be ANSI/UL 2034 when installed within the Commonwealth of Massachusetts. -
Page 32: Warranty
After installation, if any of the components manufactured by MHSC in the appliance are found to be defective in materials or workmanship, MHSC will, at its option, replace or repair the defective components at no charge to the original owner. - Page 33 MHSC 149 Cleveland Drive • Paris, Kentucky 40361 www.mhsc.com...
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