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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.
• 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 fire department.
–
Installation and service must be
performed by a qualified installer, service
agency or the gas supplier.
Monessen • NBST27 Gas Log Set Installation/Owner's Manual • 81D3032 • Rev A • 08/16
This appliance may be installed in
an aftermarket, permanently located,
manufactured (mobile) home, where not
NBST27
cover
prohibited by local codes.
This appliance is only for use with the type
of gas indicated on the rating plate. This
appliance is not convertible for use
with other gases.
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 4.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
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Table of Contents
Related Manuals for Vermont Castings NBST27-F
Summary of Contents for Vermont Castings NBST27-F
- Page 1 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 This appliance may be installed in life.
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Page 2: Table Of Contents
NBST27 Unvented Gas Log Set CONTENTS Gas and Valve Connection .......12 Important Safety Information ......3 Millivolt Valve Control........12 Codes .............4 Electrical Wiring (Millivolt) ........13 Features and Specifications .......5 Connecting Optional Wall Switch Check Parts ............5 or Thermostat ..........13 Items Needed for INstallation ......5 Connect Remote Receiver ......14 Gas Pressures ..........5 Checking System Operation ......14... -
Page 3: Important Safety Information
NBST27 Unvented Gas Log Set 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 this vent-free gas heater. WARNING: •... -
Page 4: Codes
NBST27 Unvented Gas Log Set IMPORTANT SAFETY INFORMATION MASSACHUSSETTS RESIDENTS ONLY: 18. Unvented gas heaters are a supplemental zone heater. They are not intended to be the primary heating appli- Refer to page 25 for additional information. ance. 19. Unvented gas heaters emit moisture into the living area. -
Page 5: Features And Specifications
NBST27 Unvented Gas Log Set FEATURES AND SPECIFICATIONS CHECK PARTS: GAS PRESSURES Verify contents to ensure you have received all parts. You Natural Propane (LP) should have the following: Inlet Minimum 5.0" w.c. 11.0" w.c. • Unvented Gas Log Burner Assembly Inlet Maximum 10.5"... -
Page 6: Fireplace And Hearth Dimensions
NBST27 Unvented Gas Log Set FIREPLACE AND HEARTH DIMENSIONS PLACEMENT IN FIREPLACE WITH A WARNING RESTRICTIVE BARRIER This appliance is for installation only in a solid-fuel The following are guidelines for placing a gas log set in a burning masonry or UL127 factory-built fireplace, fireplace that has a restrictive barrier along the bottom front vent free appliance, or in listed ventless firebox opening of the fireplace. Some examples of barriers are... -
Page 7: Clearances And Height Requirements
CLEARANCE AND HEIGHT REQUIREMENTS NBST27 Unvented Gas Log Set Heat resistant material (minimum requirements) with WARNING no wooden mantel or other combustible projection: The dimensions shown in Figures 3 through 9 and To install the gas logs into a fireplace with no wooden defined in the fireplace manufacturer's instructions mantel, shelf or other combustible projection above the are minimum clearances to maintain when installing... - Page 8 NBST27 Unvented Gas Log Set CLEARANCE AND HEIGHT REQUIREMENTS Heat resistant material (minimum requirements) with 10" or Less wooden mantel or other combustible projection: To install the heater with a wooden mantel, shelf or other combustible projection above, first measure the heat resis- 28" Heat Resistant tant material shown in Figure 5, then refer to Table B. Material 12"...
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Page 9: Floor Clearances
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. Figure 8 Heater in Fireplace or Firebox The gas log heater may be installed nearer to the floor if a... -
Page 10: Fireplace Preparation
NBST27 Unvented Gas Log Set FIREPLACE PREPARATION BEFORE INSTALLING THE APPLIANCE: WARNING • Turn off gas supply to fireplace or firebox. Before installing in a solid fuel burning fireplace, • The chimney flue and firebox must be cleaned of Have the fireplace floor and chimney professionally soot, creosote, ashes and loose paint by a qualified cleaned to remove ashes, soot, creosote or other chimney cleaner. -
Page 11: Place And Secure Appliance
NBST27 Unvented Gas Log Set SECURE APPLIANCE WARNING WARNING The fireplace and gas logs function as a system. If You must secure the gas log heater to the fireplace the fireplace is spilling into the room (check with floor. If not, the entire unit may move when you a match or a smoke stick), reposition the damper adjust the controls. -
Page 12: Gas And Valve Connection
NBST27 Unvented Gas Log Set GAS AND VALVE CONNECTION WARNING WARNING Connecting directly to an unregulated propane/ Use new black iron or steel pipe. Internally tinned LPG tank can cause an explosion. 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 The heater gas inlet connection is a female 3/8"... -
Page 13: Electrical Wiring (Millivolt)
ELECTRICAL WIRING — MILLIVOLT NBST27 Unvented Gas Log Set CONNECTING OPTIONAL WALL SWITCH WARNING OR THERMOSTAT Label all wires prior to disconnection when servic- 1. Use 18 awg, two-wire cable, 15 feet maximum length. ing controls. Wiring errors can cause improper and 2. -
Page 14: Connect Remote Receiver
NBST27 Unvented Gas Log Set ELECTRICAL WIRING — MILLIVOLT 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 15: Log Placement
LOG PLACEMENT NBST27 Unvented Gas Log Set DO NOT sprinkle volcanic rock on the logs, WARNING around the pilot, or on or near burners. This The positioning of the logs is critical to the safe and may cause sooting. Place volcanic rock only clean operation of this heater. - Page 16 NBST27 Unvented Gas Log Set LOG PLACEMENT 3. Place log #3 on farthest right grate tine by aligning the Continue on Side B, valve on right as you face the ‘V’ notch in log with grate tine. The groove in the bot- fireplace.
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Page 17: Flame Appearance
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. -
Page 18: Operating Instructions
NBST27 Unvented Gas Log Set OPERATING INSTRUCTIONS OPERATING INSTRUCTIONS The initial break-in operation should last four hours with the burner at the highest setting. Provide maximum ventilation Avoid any drafts that alter burner flame patterns. Do by opening windows or doors to allow odors to dissipate. not allow fans to blow directly into the fireplace. Do not Any odors remaining after this initial break-in will be slight place a blower inside the burn area of the firebox. Ceiling... -
Page 19: 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 22. -
Page 20: Match Lighting Instructions
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. -
Page 21: Troubleshooting
TROUBLESHOOTING NBST27 Unvented Gas Log Set 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 POSSIBLE CAUSE SOLUTION Ignitor electrode positioned wrong. Replace ignitor. - Page 22 NBST27 Unvented Gas Log Set TROUBLESHOOTING PROBLEM POSSIBLE CAUSE SOLUTION Control knob not fully pressed in. Press in control knob fully. After ODS/pilot lights, keep control knob Control knob not pressed in long enough. pressed in for 30 seconds. Manual shutoff valve not fully open. Fully open manual shutoff valve.
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Page 23: Replacement Parts
NBST27 Unvented Gas Log Set REPLACEMENT PARTS REF. DESCRIPTION QTY. NBST27NV NBST27PV Complete Log Set 81D3051 81D3051 Log #1 81D3034 81D3034 Log #2 81D3035 81D3035 Log #3 81D3036 81D3036 Log #4 81D3037 81D3037 Log #5 81D3038 81D3038 Log #6 81D3039 81D3039 Log #7 81D3040... -
Page 24: 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 25: Requirements In Massachusetts
MASSACHUSETTS RESIDENTS ONLY NBST27 Unvented Gas Log Set Please read and follow these special requirements NOTE REGARDING VENTED PRODUCTS 2. Approved Carbon Monoxide Detectors. Each carbon This product must be installed by a licensed plumber or monoxide detector as required in accordance with the above gas fitter when installed within the Commonwealth of provisions shall comply with NFPA 720 and be ANSI/UL 2034 Massachusetts. -
Page 26: Warranty
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 pur- chase: Vent Free Ceramic Fiber Logs and Aluminized Burners.