MHSC NBST27 Unvented Gas Log Heater Installation Guide
- July 27, 2024
- MHSC
Table of Contents
NBST27 Unvented Gas Log Heater
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Product Information
Specifications:
- Model: NBST27NV
- Type: Unvented Gas Log Heater or Vented Decorative
Appliance
Product Usage Instructions:
Important Safety Information:
Always follow the instructions in this manual to prevent fire
hazards, explosions, and personal injury.
Getting Started:
Before installation, carefully read through the manual to
familiarize yourself with the product features and
specifications.
Adequate Combustion and Ventilation Air:
Ensure proper ventilation and combustion air supply as detailed
on Page 6 of the manual to maintain safe operation.
Fireplace Preparation:
Prepare the fireplace according to the instructions provided in
the manual before installing the gas log set.
Log Placement:
Follow the guidelines for log placement, rockwool, ember
placement, and flame appearance for optimal performance.
Operating Instructions:
Read and understand the lighting instructions before operating
the gas log set. Follow the specific steps for millivolt control
lighting and match lighting.
FAQ
Q: Can this appliance be used with different types of gas?
A: No, this appliance is designed for use with the specific gas
type indicated on the rating plate and is not convertible for other
gases.
Q: What should I do in case of system malfunctions?
A: If you encounter system malfunctions, refer to the manual for
troubleshooting steps or contact a qualified technician for
assistance.
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Unvented Gas Log Heater
or
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.
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.
This appliance may be installed in an aftermarket, permanently located,
manufactured (mobile) home, where not 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 6.
INSTALLER: Leave this manual with the appliance. CONSUMER: Retain this manual
for future reference.
81D3032 8/10 Rev. 3
NBST27 Unvented Gas Log Set
CONTENTS
Important Safety Information ………………………..3 Codes …………………………………………………….4
Getting Started……………………………………………..5
Product Features and Specifications ……………5 Gas Pressures…………………………………………5 Gas
Specifications……………………………………5 Ignition Controls……………………………………….5 Pilot/ODS
………………………………………………..5 Thermal Generator …………………………………..5
General Installation Information …………………..6 Adequate Combustion and
Ventilation Air ……6
Fireplace and Hearth Dimensions …………………7 Placement in a Fireplace with a
Restrictive Barrier …………………………………………………………7
Clearances and Height Requirements …………..8 Floor Clearance …………………………………….10
Fireplace Preparation …………………………………11
Installing Vented Applications ……………………11
Gas Line Connection…………………………………..13 Millivolt ………………………………………………….13
Electrical Wiring (Millivolt)…………………………..14 Optional Wall Switch or Thermostat
………….14 Remote Receiver……………………………………15 Checking System Operation…………………….15
Log Placement ……………………………………………16 Rockwool and Ember Placement ……………..16 Log
Placement……………………………………….17
Flame Appearance………………………………………20 Pilot Flame…………………………………………….20 Burner
Flame…………………………………………20
Operating Instructions ………………………………..21 For Your Safety Read Before Lighting
……….21 Millivolt Control Lighting Instructions …………22 To Turn Off Gas to
Heater………………………..22 Match Lighting Instructions………………………23
Maintenance ……………………………………………….23
Troubleshooting …………………………………………24
Replacement Parts ……………………………………..26
Accessories ……………………………………………….27
Requirements in Massachusetts………………….30
Warranty …………………………………………………….31
2
81D3032
IMPORTANT SAFETY INFORMATION
NBST27 Unvented Gas Log Set
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.
· Do not allow fans to blow directly into the fireplace. Avoid any drafts that
alter burner flame patterns.
· Do not use a blower insert, heat exchanger insert or other accessory, not
approved for use with this heater where applicable.
1. Due to high temperatures, the appliance should be located out of traffic
and away from furniture and draperies.
2. Children and adults should be alerted to the hazard of high surface
temperature and should stay away to avoid burns or clothing ignition.
3. Young children should be carefully supervised when they are in the same
room with the appliance.
4. Do not place clothing or other flammable material on or near the
appliance.
5. Any safety screen or guard removed for servicing an appliance, must be
replaced prior to operating the heater.
6. Installation and repair should be done by a qualified service person.
7. To prevent malfunction and/or sooting, an unvented gas heater should be
cleaned before use and at least annually by a professional service person.
More frequent cleaning may be required due to excessive lint from carpeting,
bedding material, etc. It is imperative that control compartments, burners and
circulating air passageways be kept clean.
8. CARBON MONOXIDE POISONING: Early signs of carbon monoxide poisoning are
similar to the flu with headaches, dizziness and/or nausea. If you have these
signs, obtain fresh air immediately. Have the heater serviced as it may not be
operating properly.
9. The installation must conform with local codes or, in the absence of local
codes, with the National Fuel Gas Code, ANSI Z223.l/NFPA54.
10. This unit complies with ANSI Z21.11.2-2007 Unvented Heaters and also
complies with ANSI Z21.60 Decorative Vented Appliances for Solid Fuel Burning
Fireplaces. State and local codes may only allow operation of this appliance
in a vented configuration. Check your state or local codes. For vented
operation, see “Vented Instructions” in this manual.
81D3032
11. Do not install the heaters in a bathroom or bedroom. 12. Correct
installation of the ceramic fiber logs, proper
location of the heater, and annual cleaning are necessary to avoid potential
problems with sooting. Sooting, resulting from improper installation or
operation, can settle on surfaces outside the fireplace. See log placement
instructions for proper installation. 13. Avoid any drafts that alter burner
flame patterns. Do not allow fans to blow directly into fireplace. Do not
place a blower inside burn area of firebox. Ceiling fans may create drafts
that alter burner flame patterns. Sooting and improper burning will occur. 14.
Caution: Candles, incense, oil lamps, etc. produce combustion by-products
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. 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 6 16. Keep room
area clear and free from combustible materials, gasoline and other flammable
vapors and liquids. 17. Unvented gas heaters are a supplemental zone heater.
They are not intended to be the primary heating appliance. 18. 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.
3
NBST27 Unvented Gas Log Set
19. During manufacturing, fabricating and shipping, various components of
this appliance are treated with certain oils, films or bonding agents. These
chemicals are not harmful but may produce annoying smoke and smells as they
are burned off during the initial operation of the appliance; possibly causing
headaches or eye or lung irritation. This is a normal and temporary
occurrence.
The initial break-in operation should last four hours to properly cure logs
and rock wool, with the burner at the highest setting. Provide maximum
ventilation by opening windows or doors to allow odors to dissipate. Any odors
remaining after this initial break-in period will be slight and will disappear
with continued use.
20. Input ratings are shown in BTU per hour and are for elevations up to
2,000 feet. For elevations above 2,000 feet, input ratings should be reduced 4
percent for each 1,000 feet above sea level. Refer to the National Fuel Gas
Code.
21. The appliance and its appliance main gas valve must be disconnected from
the gas supply piping system during any pressure testing of that system at
test pressures in excess of 1/2 psig (3.5 kPa).
22. The appliance must be isolated from the gas supply piping system by
closing its equipment shutoff valve during any pressure testing of the gas
supply piping system at test pressures equal to or less than 1/2 psig (3.5
kPa).
23. Do not use this room heater if any part has been under water. Immediately
call a qualified service technician to inspect the room heater and to replace
any part of the control system and any gas control which has been under water.
24. This appliance must not be used with glass doors in the closed position.
This can lead to pilot outages and severe sooting outside the fireplace.
25. Never burn solid fuels in a fireplace where a unvented room heater is
installed.
26. Always have a fireplace screen in place when the appliance is in
operation and, unless other provisions for combustion air are provided, the
screen must have an opening(s) for induction of combustion air.
WARNING
IMPORTANT SAFETY INFORMATION
Never connect unit to private (non-utility) gas wells. This gas is commonly
known as wellhead gas.
Massachussetts resiDents only:
refer to Page 30 for additional 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. Batterymarch Park Quincy, MA 02269
NBST27 Certified To ANSI Z21.11.2a-2008 Unvented Heaters & Z21.60b – 2004; CSA 2.26b – 2004
4
81D3032
GETTING STARTED – FEATURES and SPECIFICATIONS
NBST27 Unvented Gas Log Set
WARNING
Gloves are recommended when handling ceramic fiber logs to prevent skin
irritation from loose fibers. Logs are fragile – handle with care.
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 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.
· Hand Held Remote with Receiver · Wall Thermostat with 15′ Wire · Wall Switch
with 15′ Wire · Hand held Thermostat Remote with Receiver · Andirons
Carefully inspect the contents for shipping damage. If any parts are missing
or damaged, immediately inform the dealer from whom you purchased the
appliance. Do not attempt to install any part of the appliance unless you have
all parts in good condition.
WHAT YOU WILL NEED FOR INSTALLATION:
You should have the following items available before proceeding with
installation:
· External regulator (for propane/LPG and 1/2 lb.
natural gas systems only)
· Piping which complies with local codes · Sediment trap (recommended) ·
Screwdriver · Tee joint. · Pipe sealant approved for use with propane/LPG
(Resistant to sulfur compounds)
· Drill with 5/32 masonry bit · Pipe wrench or appropriate size crescent
wrench
set
· Manual shutoff valve
GAS PRESSURES
Inlet Minimum
Natural *Propane (LP) 5.0″ w.c. 11.0″ w.c.
Inlet Maximum
10.5″ w.c. 13.0″ w.c.
Regulator Pressure
3.5″ w.c. 10.0″ w.c.
Pilot Regulator
3.5″ w.c.
—
*NOTE: An external regulator is required to reduce supply pressure to a maximum of 13″ w.c.
GAS SPECIFICATIONS
Model NBST27NV NBST27PV
Fuel Control Nat. Millivolt LP Millivolt
Gas Rate Max.Input Min. Input
BTU/h BTU/h 39,000 26,000 39,000 30,000
IGNITION CONTROLS
Piezo ignitor allows ignition of the pilot without the use of matches or
batteries. Millivolt control has four (4) positions:
OFF – All gas to the gas logs is shut off at the valve. IGN – Valve position
to light/maintain a standing pilot. ON – Valve position to turn ON/OFF log set
with remote switch/thermostat. LOW/HI – Variable position to control flame
height (heat output).
PILOT/ODS
The gas log heater is fitted with a specially designed safety pilot (ODS
assembly) which senses the amount of oxygen available in the room and shuts
the gas log heater off if the oxygen level begins to drop below a satisfactory
level. The pilot can only be relit when adequate fresh air is available.
THERMAL GENERATOR
The millivolt gas log pilot is fitted with a milli-volt (thermopile) generator
to provide power for remote activation.
81D3032
5
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 provisions 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 m3 per kw) of the aggregate input rating of all appliances installed in that space. An unconfined space is defined as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed, through openings not furnished with doors, are considered a part of the unconfined space.
UNUSUALLY TIGHT CONSTRUCTION IS DEFINED AS CONSTRUCTION WHERE…
a) walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of 1 perm
(6 x 1011 kg per pa-sec-m2) or less with openings gasketed or sealed;
Inside Wall
b) weather striping has been added on openable windows and
doors, and
Fireplace
c) caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at penetra-
tions for plumbing, electrical, and gas lines, and at other openings.
H
L2
Figure 1 –
Example of a Large Room
with a See-thru Unit as 1/2 Wall Divider
L1
W
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. 50
x 1000
BTU Hr
Consider two connecting rooms with an open area between, with the following dimensions:
/ BTU Hr =
L1 = 15Zx Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
(15Zx + 12) x (12) x (8) 50
x 1000 = 52800
/ BTU Hr
WARNING
If the area in which the heater may be operated is smaller than that defined as an unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1/NFPA 54, Air for Combustion and Ventilation or applicable local codes.
6
81D3032
FIREPLACE and HEARTH DIMENSIONS
NBST27 Unvented Gas Log Set
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 factory-built fireplace that
includes instructions stating it has not been tested or should not be used
with unvented gas logs.
Use the fireplace manufacturer’s installation and clearance requirements as
defined in their manual.
The NBST27 unvented room heater is approved for installation into the
following unvented fireplaces:
VF Series Fireboxes: GPF36, GSTF36, GRCF36, GLCF36, LSTF36, LPF36, LRF36,
LLF36
The NBST27 unvented room heater may also be installed into a Ventless Firebox
Enclosure for Gas Fired Decorative Type Unvented Room Heaters per IAS
Requirement No. 297 ANSI Z21.91-2001 (typically referred to as a “Universal
Firebox”), as long as firebox hearth dimensions meet the minimum hearth
dimensions shown below.
IMPORTANT INFORMATION FOR THE INSTALLATION OF THIS GAS LOG SET PLACEMENT IN A FIREPLACE WITH A RESTRICTIVE BARRIER
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) No Restriction 1/2″ to 1Zx”
Minimum Depth of Fireplace/Firebox
21Zx” 25Zv”
Greater than 1Zx” to 3″
27Zv”
Greater than 3″
*Any barrier greater than 3″ placed in front of the gas log
set is not recommended by the manufacturer.
2156O”
NOTE: Non combustible material such as refractory brick
may be used to line the floor of the fireplace in order to raise
the height of the gas log set in relation to a restrictive barrier.
If the unit is raised, the minimum height dimension listed in
the homeowner’s manual must not be exceeded.
FP2361
NOTE: If the log set is equipped with a remote receiver, a
restrictive barrier may reduce the battery life by increasing
32″
the ambient temperature inside the fireplace. Placement
2156O”
of the receiver outside of the fireplace will extend the
battery life.
Figure 2 Hearth Minimum Dimensions for Solid Fuel Burning Fireplaces and UL127 Factory Built Fireplaces
Glass door frames with adjustable louvers should have the louvers fully open while the unit
is in operation
WARNING
Barriers such as the bottom of a glass door frame placed in front of a gas log
set can change the air flow characteristics of the fireplace which in turn can
cause the unit to overheat and malfunction.
81D3032
X
Height of restrictive barrier caused by glass door frames, recessed
fireplaces, etc. from the base or bottom surface of the unit. (Refer to Table)
FP2362
Refer to Table
Figure 3 Reference Drawing of NBST27 Log Set in an Enclosure
7
NBST27 Unvented Gas Log Set
CLEARANCE and HEIGHT REQUIREMENTS
WARNING
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.
Follow these instructions carefully to ensure safe installation. Failure to
follow instructions exactly can create a fire hazard.
Sidewall and ceiling clearances: The sides of the fireplace opening must be at least 1Cv” from any combustible wall. The ceiling must be at least 42″ from the top of the fireplace opening. The wall parallel to the side of the heater must be at least 36″ from the side of the heater. Refer to your firebox owners manual for more information.
To install the gas logs into a fireplace with no wooden mantel, shelf or other
combustible projection above the fireplace opening, measure the heat resistant
material height, per Figure 5, then see TABLE A.
Heat resistant materials such as slate and marble must be at least 1/2″ thick.
Sheet metal should not be installed onto combustible material.
IMPORTANT: If the unit is installed in a vented fireplace and cannot meet
these minimum clearances you must operate the heater with chimney flue damper
open. Refer to “Installing Vented Applications” on Page 11.
42″
36″
Heat Resistant
Material
Figure 5 –
Measure Heat Resistant Material
Measure This Distance
36″ FP2363
16M”
Figure 4 Sidewall and Ceiling Clearances
Heater in Fireplace or Firebox
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 Figure 8 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.
Heat resistant material (minimum requirements) with no wooden mantel or other
combustible projection:
FP2364
Table A – Heat Resistant Material Requirements with no Mantel or Combustible Projection
Heat Resistant Material Measurement 12″ or more 8″ to less than 12″
Less than 8″
Requirements for Safe Installation Hood not required Extend heat resistant material to 12″ or install hood. Figure 5 Extend heat resistant material to at least 8″ and install hood. Figure 5. OR extend heat resistant material to a height of at least 12″
8
81D3032
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 6, then refer to Table B.
NBST27 Unvented Gas Log Set
Figure 7 Minimum Mantel Clearance with No Hood
10″ or Less
Heat Resistant
28″
Material
Figure 6 Measure Heat Resistant Material for Mantel
Hood
8″ or More of Heat Resistant Material
12″ Min.
Heater in Fireplace or Firebox
FP2365
Table B Heat Resistant Material Heights and Mantel Location
Heat Resistant Requirements for Safe Installation
Material
with Wooden Mantel, Shelf or
Measurement other Combustible Projection
12″ or more
Hood not required. Observe profile (side
elevations) shown in Figure 7.
8″ to less than 12″ Install hood and observer profiles shown
in Figure 8; OR extend heat resistant
material to at least 12″ and observe
profiles shown in Figure 7.
Less than 8″
Extend heat resistant material to at least
8″, install hood and observe profiles
shown in Figure 8; OR extend heat
resistant material to at least 12″ and
observe profiles shown in Figure 7.
FP2366
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 8 Minimum Mantel Clearance with Hood
Heat Resistant Material
12″ 256O” 24″
13″
Hood
Heater in Fireplace or Firebox
Example:
FP2367
A mantel may project from the wall a maximum of 2Zx” at a
minimum of 13″ above the opening, and a maximum of 12″
at a minimum of 24″ above the opening.
81D3032
9
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. Figure 9
OR
Heater in Fireplace or Firebox
Combustible Material
3/4″
FP2368
Figure 9 Minimum Clearance above Combustible Flooring
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. Figure 10
Heater in Fireplace or Firebox
Combustible Material
This Distance may now be Less Than 3/4″
FP2369
14″ Min.
Figure 10 Minimum Clearance above Combustible Flooring with Noncombustible Material Installed at Base of Fireplace
10
81D3032
WARNING
FIREPLACE PREPARATION
NBST27 Unvented Gas Log Set
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.
Exception: DO NOT install this appliance in a factory-built fireplace that
includes instructions stating that it has not been tested or should not be
used with unvented gas logs. This log set may be installed as a vented log
set.
This log set may be installed as a vented log set.
BEFORE FULLY INSTALLING THE UNIT:
· Turn OFF the gas supply to the fireplace or firebox. · 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.
INSTALLING VENTED APPLICATIONS
Milli-volt controlled gas logs may be installed as a vented decorative log set
in compliance with ANSI Z21.60 and National Fuel Gas Code, Section 6.6. Since,
the gas logs are operated with the damper open, noncombustible material and
minimum mantel requirements do not apply.
BEFORE INSTALLING THE APPLIANCE:
· Turn off gas supply to fireplace or firebox. · Have the fireplace floor and
chimney professionally
cleaned to remove ashes, soot, creosote or other obstructions. Have this
cleaning performed annually after installation.
· Seal any fresh air vents or ash clean-out doors located
on floor or wall of fireplace. If not, drafting may cause pilot outage or
sooting. Use a heat-resistant sealant. Do not seal chimney flue damper.
Install and operate the appliance as directed in this manual.
DAMPER STOP INSTALLATION:
A damper stop must be provided with the unit when used for vented
applications. Contact your dealer to obtain one. The damper stop must be
installed as shown in Figure 11 to prevent full closure of the fireplace
damper blade and provide a minimum 29 square inch flue opening. refer to Page
30 for installations in the Commonwealth of Massachusetts.
Damper Stop
FP2370
Damper
Figure 11 Damper Stop Installation (Refer to WARNING at top of page)
81D3032
11
NBST27 Unvented Gas Log Set
VENTED APPLICATION INSTALLATION / 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.
WARNING
You must secure the gas log heater to the fireplace floor. If not, the entire
unit may move when you adjust the controls. Movement of unit may cause
shifting of the logs which leads to sooting and improper burning. Grate
movement could cause a gas leak.
Special care is required if you are installing the unit into a sunken
fireplace. You must raise the fireplace floor to allow access to gas log
controls. This will insure adequate air flow and guard against sooting. Raise
the fireplace floor using noncombustible materials, as described in “Placement
in a Fireplace with Restrictive Barrier” section.
PLACE and SECURE APPLIANCE
1. Center the gas log unit in the fireplace or firebox. Make certain the
front feet of the grate sit inside the front edge of the fireplace or firebox.
2. Anchor holes are located on the right and left sides of the unit. After
centering the grate correctly, mark the hole locations on the
fireplace/firebox floor. Drill two (2) 5/32″ diameter holes approximately 1Zx”
deep.
3. Anchor the unit to the fireplace/firebox floor using the screws provided.
Figure 12
Proper installation of the grate is essential to prevent any movement of the
logs and controls during operation.
NOTE
RIGHT CORNER APPLICATIONS
For right corner installations, the piezo ignitor can be moved to the opposite
corner of the appliance:
1. Remove wire from back of ignitor.
2. Remove two (2) screws holding piezo bracket.
3. Reattach bracket on the opposite corner (where inlet fuel comes into the
valve) by using two clearance holes on burner base.
4. Reattach wire to ignitor.
Figure 12 Secure Burner
FP2375
Piezo Ignitor (Original Location)
12
81D3032
GAS LINE CONNECTION
NBST27 Unvented Gas Log Set
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.
A manual shutoff valve must be installed upstream of the appliance. Union tee
and plugged 1/8″ NPT pressure tapping point should be installed upstream of
the appliance. Figure 13
NOTICE: A qualified gas appliance installer must connect the heater to the gas
supply. Consult all local codes.
IMPORTANT: Hold heater valve firmly with a wrench to prevent movement when
connecting to inlet pipe.
Always use an external regulator for all propane/LPG heaters and high pressure
one to two-pound systems only, to reduce the supply tank pressure to a maximum
of 13″ w.c. This is in addition to the internal regulator in the heater valve.
Stainless Flexible Tube, Pipe or Metal Tube
To Heater Valve
Pipe Coupling
Pipe
Possible Locations for Pressure Tapping Point
Gas Supply Inlet
Manual Shut-off Valve
Figure 13 Gas Connection
FP2371
CHECk GAS TYPE: The gas supply must be the same as stated on the heater’s rating plate. If the gas supply is different, DO NOT INSTALL THE HEATER. Contact your dealer for the correct model.
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 the joint to the valve, hold the valve securely to prevent
movement.
Test all gas connection from the gas meter to the heater valve for leaks using
a gas analyzer or soap and water solution after completing connection. DO NOT
USE AN OPEN FLAME.
Check the gas pressure with the appliance burning and the control set to HIGH.
MILLI-VOLT VALVE CONTROL (Figure 14)
The valve regulator controls the burner pressure which should be checked at
the pressure test point.
Turn captured screw counter clockwise two or three turns and then place tubing
to pressure gauge over test point (Use test point “OUT” closest to control
knob). After taking pressure reading, be sure and turn captured screw
clockwise firmly to re-seal. Do not over torque. Check for gas leaks.
Repeat process for “IN” port. Check “IN” port with unit set on high with any
other gas appliances in the house on or cycling on. Pressure gauge readings
should match max/min requirements on data plate.
Test Port “OUT”
WARNING WARNING
Connecting directly to an unregulated propane/LPG tank can cause an explosion.
81D3032
Figure 14 Pressure Test Point Location Millivolt Control
FP2372
13
WARNING
NBST27 Unvented Gas Log Set
ELECTRICAL WIRING – MILLIVOLT
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.
ODS Pilot
ON/OFF Switch or Optional Wall Switch, Remote or T-Stat
TH = 3 TP = 1 TP/TH = 2
Figure 15 Wiring Diagram
NOTE: Log switch wires are not factory connected. Connect log switch wires to
the TH/TP and TH valve terminals.
Log Switch
ODS Pilot Millivolt Valve
FP2267
CONNECTING OPTIONAL WALL SWITCH OR THERMOSTAT
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. The color of the wires does not matter.
14
81D3032
NOTICE
ELECTRICAL WIRING – MILLIVOLT
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.
Do not allow wires to touch grate of burner.
NOTE: Heat reduces battery life. Protect the receiver and extend battery life
by mounting receiver in wall or other location outside the fireplace.
CHECkING SYSTEM OPERATION
The millivolt system and individual components may be checked with a millivolt
meter having a 1-1000 mV range. Conduct each check shown in chart by
connecting meter test leads to terminals as indicated.
NBST27 Unvented Gas Log Set
A. Complete Millivolt System Check
(“A” Reading – Thermostat contacts CLOSED – Control knob “ON” – Main burner
should turn ON)
1. If reading is more than 175 millivolts and the automatic valve still does
not come on, replace the control.
2. If the closed circuit reading (“A” reading) is less than 175 millivolts,
determine cause for low reading, proceed to Section B.
B. Thermopile Output Reading Check
(“B” Reading – thermostat contacts OPEN – Main burner OFF
1. Check gas pressure to the unit. If gas pressure is within minimum and
maximum on data plate, then check pilot voltage, 500 millivolts minimum. If
the minimum millivolt reading is not obtainable, replace pilot.
Check Test A
B
To Test Complete System Thermopile
Output
Connect Meter Leads To Terminals
2 & 3
Switch or Thermostat
Contacts
Closed
Meter Reading Should Be
Minimum 175
1 & 2
Open
Minimum 500
Remote Wires
Remote Wire Connectors
Valve
Remote Receiver Figure 16 Install Remote Receiver
81D3032
FP2376
15
NBST27 Unvented Gas Log Set
LOG PLACEMENT
WARNING CAUTION
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 rock wool (EB-RW), and flickering embers (FBE-.1G)
supplied with the unit.
Failure to position the parts in accordance with diagrams below or to use only
parts specifically approved for this heater may result in property damage or
personal injury.
Before you begin – This unit is supplied with 10 ceramic fiber logs. Do not handle the logs with 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.
ROCk WOOL and EMBER PLACEMENT
1. Place dime size pieces of rock wool evenly over small burner ports starting at pilot and down each side of burner. Avoid placing rock wool on slots on either side of burner between the air defectors. Figure 17. Wash hands after placing rock wool. Skin irritation may occur.
Pilot
Grate Tine
Rockwool
Horizontal Grate Bar
DO NOT sprinkle volcanic rock on the logs, around the pilot, or on or near
burners. This may cause sooting. Place volcanic rock only on the floor of the
fireplace.
During initial operation of the new heater, new burning logs and/or rock wool
will give off a paper burning smell and orange flames will be present. Simply
open the windows for a few hours to vent the odor.
2. Place flickering bright embers (FBE-.1G) before placing logs on burner.
Pull embers apart into small strands and place on top of existing rock wool on
both sides of burner from the air deflectors to the end of each burner where
they can be seen. Try to avoid stacking these embers on top of each other. Use
smaller strands for maximum effect. Use as much as needed to achieve desired
effect. Figure 18
Grate Tines
Figure 17 Place Rock Wool
Rock Wool
Horizontal Grate Bar
16
LG648
Flickering Bright Embers
Figure 18 Place Flickering Bright Embers
LG649 Rock wool
81D3032
LOG PLACEMENT
LOG PLACEMENT
Begin on Side A, valve on left as you face the fireplace.
1. Place log #1 on burner by aligning two (2) holes on bottom of log with two
(2) pins on burner. The tallest part of the log is on the valve side of
burner. Gently push log down until it comes in contact with burner surface.
Figure 19
Control Valve
NBST27 Unvented Gas Log Set
Log 1 Figure 19 Place Log #1
LG650
2. Place log #2 on left grate tines by aligning the `V’ notches in the log
with grate tines. The groove on the bottom of the log should be firmly seated
on the grate bar. Figure 20
Log #2
Figure 20 Place Log #2
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 21
Log #4
LG651
Figure 21 Place Log #3
Log #3 LG652
81D3032
LG653
4. Place log #4 by aligning the `V’ notch on bottom of log with horizontal
grate bar between tines as shown in Figure 22. Place the rectangular notch on
bottom of log onto the matching rectangular protrusion on log #1. Figure 22
Figure 22 Place Log #4
17
NBST27 Unvented Gas Log Set
5. Place log #5 by placing rectangular notch on bottom of log onto matching
rectangular protrusion on log #2. Make sure ember or `burnt’ portion of log is
facing center of burner. Figure 23
Log #5
LOG PLACEMENT
Figure 23 Place Log #5
LG654
Continue on Side B, valve on right as you face the fireplace.
Log #6
Log #1
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. Place the rectangular notch in the bottom of the log onto the rectangular protrusion on the end of log #1. Figure 24
LG655
Figure 24 Place Log #6
Control Valve
7. Place log #7 on left two (2) grate tines by aligning the `V’ notch in log
with grate tines. Make sure groove on bottom of log is firmly seated on grate
bar. Figure 25
18
Figure 25 Place Log #7
Log #7
LG656
81D3032
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 rectangular notch on
bottom of log onto rectangular protrusion on middle of log #1. Figure 26
NBST27 Unvented Gas Log Set
Figure 26 Place Log #8
Log #9
Log #8
LG657
Figure 27 Place Log #9
9. Place log #9 on farthest right grate tine by aligning `V’ notch in bottom of log with grate tine. Place rectangular notch in bottom of log onto rectangular protrusion on log #8. Figure 27
LG658
Log #10
10. Place log #10 by aligning two (2) rectangular notches on bottom of log with rectangular protrusions on logs #6 & #7. Make sure the ember or `burnt’ area of log is facing center of burner. Figure 28
Figure 28 Place Log #10
LG659
81D3032
19
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
29 for correct pilot flame. If the pilot flame does not touch the
thermocouple, then the main burner cannot function reliably. Figure 30 for
incorrect shape of pilot flame.
Thermocouple for Natural Gas
Thermocouple for Natural Gas
Thermocouple for LP
Figure 29 Correct Pilot Flame Appearance
FP2272
Thermocouple for LP
Figure 30 Incorrect Pilot Flame Appearance
FP2273
CHECk BURNER FLAME APPEARANCE
In normal operation at full rate after 15 minutes, the flames should appear as
shown in Figure 31.
The flames should be yellow and extend 3-4″ above the log top surfaces. The
yellow flames should not impinge on the logs.
Figure 31 Correct Burner Flame Appearance
20
LG661
81D3032
OPERATING INSTRUCTIONS
NBST27 Unvented Gas Log Set
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. These
chemicals are not harmful, but may produce annoying smoke and smells as they
are burned off during the initial operation of the appliance, possibly causing
headaches or eye or lung irritation. this is a normal and temporary
occurrence.
The initial break-in operation should last four hours with the burner at the
highest setting. Provide maximum ventilation by opening windows or doors to
allow odors to dissipate. Any odors remaining after this initial break-in will
be slight and will disappear with continued use.
This appliance must not be used with glass doors in the closed position. This
can lead to pilot outages and severe sooting outside the fireplace.
FOR YOUR SAFETY, READ BEFORE LIGHTING
WARNING
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 a piezo ignition device which lights the
pilot. If piezo is not working properly see Match lighting instructions, Page
23.
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.
WHAT TO DO IF YOU SMELL GAS:
· Do not attempt to light any appliance.
Control Knobs
· Do not touch any electric 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.
C. Use only your hand to push in, or turn the gas control knob. Never use
tools. If the knob will not push in or turn by hand, don’t try to repair it.
Call a qualified service technician. Force or attempted repair may result in a
fire or explosion.
D. Do not use this appliance if any part of it has been under water.
Immediately call a qualified service technician to inspect the appliance and
to replace any part of the control system and any gas control that has been
under water.
Piezo Ignitor
Figure 32 Burner Controls
FP2373
81D3032
21
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.
4. Turn gas control knob clockwise
to the OFF position and turn ON/OFF switch to OFF position.
5. Wait (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas, STOP! Follow the instructions under What to Do if you smell Gas, Page 21.
6. From OFF position, turn the gas control knob counterclockwise
to IGN position. Push in control
knob for 5 seconds. NOTE: If you are running the heater for the first time, it may be necessary to
press in the control knob for 30 seconds or longer to allow air to bleed out of the gas piping.
7. With the control knob pushed in, push in and release the piezo ignitor button to light the pilot.
8. Continue pushing the control knob in for a further 60 seconds to prevent the flame detector from shutting off the gas while the probe is warming up. Release the control knob.
9. Turn gas control knob counterclockwise
to the ON position.
10. After the pilot has been lit for one minute, the burners can be turned on. Turn the ON/OFF switch to ON position.
11. If the gas logs will not operate, follow the instructions To Turn Off Gas To Heater below and call your service technician or gas supplier.
Switch
On/Off/Pilot Knob
Hi/Lo Knob
Figure 33 Pilot
FP2275
Figure 34 Controls
FP2374
Piezo Ignitor
TO TURN OFF GAS TO HEATER
1. Turn control knob clockwise
to OFF position to completely shut off the heater.
2. If applicable: Turn ON/OFF switch to OFF position and/or set thermostat (if present) to lowest setting.
3. If applicable: Turn off all electric power to the heater.
22
81D3032
OPERATING INSTRUCTIONS and MAINTENANCE
NBST27 Unvented Gas Log Set
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. Call a qualified service technician for repair or replacement of the piezo
ignitor.
WARNING
Turn off heater and allow to cool before cleaning. Disconnect electrical power before cleaning or servicing.
CLEANING AND SERVICING
Annual inspection and cleaning by your dealer or qualified service technician
is recommended to prevent malfunction and/or sooting.
Remove logs, handling carefully by holding gently at each end. Gloves are
recommended to prevent skin irritation from ceramic fibers. If skin becomes
irritated, wash gently with soap and water. Refer to manual for correct log
placement.
PERIODIC CLEANING – Refer to parts diagram for location of items discussed
below.
· Do not use cleaning fluid to clean logs or any part of
heater.
· Brush logs with soft bristle brush or vacuum with
brush attachment.
· Vacuum loose particles and dust from the front and
rear burner, control and piezo covers and grate weldment.
· Inspect and clean burner air intake holes. Remove
lint or particles with vacuum, brush, or pipe cleaners. Failure to keep air
intake holes clean will result in sooting and poor combustion.
· External case should be dusted and wiped with a
wet soapy cloth.
ANNUAL CLEANING/INSPECTION – Refer to parts diagram for location of items
discussed below.
· Inspect and clean burner air intake holes. Remove
lint or particles with vacuum, brush or pipe cleaners. Failure to keep air
intake holes clean will result in sooting and poor combustion.
· Inspect and clean all burner ports. · Inspect ODS pilot for operation and
accumulation of
lint at air intake holes.
· Verify flame pattern and log placement for proper
operation.
· Verify smooth and responsive ignition of main burner
and rear burner.
· Replace battery in remote control device.
81D3032
23
WARNING
NBST27 Unvented Gas Log Set
TROUBLESHOOTING
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.
Possible Cause
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. Broken ignitor cable. 6. Bad piezo ignitor. 1. Appliance
burning vapors from
paint, hair spray, glues, etc. 2. Gas leak. 3. Initial burn off.
1. Not enough fresh air is available for ODS/pilot to operate.
2. Low line pressure. 3. ODS/pilot is partially clogged. 4. Defective
thermopile.
5. Restrictions in incoming air flow.
1. Gas leak. 2. Control valve defective.
1. Gas supply turned off or manual shutoff valve closed.
2. Control knob not in PILOT position. 3. Control knob not pressed in while
in
PILOT position. 4. Air in gas lines when installed.
5. ODS/pilot is clogged.
6. Gas regulator setting is not correct.
Solution
1. Replace ignitor. 2. Replace ignitor. 3. Reconnect ignitor cable.
4. Free ignitor cable if pinched by any metal or tubing.
5. Replace ignitor cable. 6. Replace piezo ignitor. 1. Ventilate room. Stop
using odor caus-
ing products while heater is running. 2. Locate and correct leaks. 3.
Ventilate room and turn unit on high
until odor is gone. Odor should be gone after 6 hours of continuous use. 1.
open window and/or door for ventilation. 2. Contact local gas company. 3.
Clean ODS/pilot. 4. Check wire connections. Check output should be 500 mV
across TH/TP and TP terminals with ON/OFF switches off. 5. Check for bottom
riser on glass door, sunken fireplace, excessive lava rock/ cinders densely
packed against grate. 1. Locate and correct all leaks. 2. Replace control
valve.
1. Turn on gas supply or open manual shutoff valve.
2. Turn control knob to PILOT position. 3. Press in control knob while in
PILOT
position. 4. Continue holding down control knob.
Repeat igniting operation until air is removed. 5. Replace ODS/pilot assembly
or get it services. 6. Check incoming pressure. Replace gas regulator.
24
81D3032
TROUBLESHOOTING
NBST27 Unvented Gas Log Set
Problem
ODS/pilot lights, but flame goes out when control knob is released.
Burner does not light after ODS/pilot is lit. Burner backfires during
combustion. Slight smoke or odor during initial operation. Logs appear to
smoke after initial operation.
Heater produces a whistling noise when burner is lit.
No gas to pilot.
Possible Cause
Solution
1. Control knob not fully pressed in. 2. Control knob not pressed in long
enough. 3. Manual shutoff valve not fully open. 4. Thermocouple connection
loose at
control valve. 5. Pilot flame not touching thermocou-
ple, which allows thermocouple to cool, causing pilot flame to go out. This
problem could be caused by either low gas pressure, or a dirty or partially
clogged ODS/pilot. 6. Thermocouple damaged. 7. Control valve damaged. 1.
Burner orifice is clogged. 2. Burner orifice diameter is too small. 3. Inlet
gas pressure is too low. 1. Manifold Pressure is too low. 2. Burner orifice is
clogged. 1. Burner orifice is clogged or damaged. 2. Burner is damaged. 3. Gas
regulator is defective. 1. Vapors from paint or curing process of logs.
1. Turning control knob to HIGH position when burner is cold.
2. Air in gas line.
3. Dirty or partially clogged burner orifices.
1. LP regulator shut down due to inlet pressure too high.
1. Press in control knob fully. 2. After ODS/pilot lights, keep control
knob pressed in for 30 seconds. 3. Fully open manual shutoff valve. 4. Hand
tighten thermocouple connection
until snug, then tighten 1/4 turn more. 5. Contact local gas company.
6. Replace thermocouple. 7. Replace control valve. 1. Clean burner or replace
burner orifice. 2. 3. 1. Contact local gas company. 2. Clean burner or replace
burner orifice. 1. Clean burner or replace burner orifice.
2. Replace burner. 3. Replace gas regulator. 1. Problem will stop after a few
hours
of operation. Run the heater with the damper open if you have one, or open a
window for the first few hours. 2. Log heater is intended to be smokeless.
Turn OFF heater and call qualified service person. 1. Turn control knob to LOW
position and let warm up for a minute. 2. Operate burner until air is removed
from line. Have gas line checked by local gas company. 3. Clean burner or
replace burner orifice.
1. Verify LP tank regulator is installed and set at 11″ to 13″ w.c.
2. Replace regulator on heater.
WARNING
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.
81D3032
25
NBST27 Unvented Gas Log Set
1b
1e 1f
1a 1h
1c
1d 1g
1i 1j
4
REPLACEMENT PARTS
3
5
2
8 7
6
Ref. Description
Qty.
1. Complete Log Set
1
1a. Log #1
1
1b. Log #2
1
1c. Log #3
1
1d. Log #4
1
1e. Log #5
1
1f. Log #6
1
1g. Log #7
1
1h. Log #8
1
1i. Log #9
1
1j. Log #10
1
2. Burner
1
3. Control Valve
1
4. ODS Pilot Assembly
1
5. Pilot Regulator
1
6. Piezo Ignitor
1
7. Piezo Wire
1
8. On/Off Switch
1
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.
WARNING
26
NBST27NV 81D3033 81D3034 81D3035 81D3036 81D3037 81D3038 81D3039 81D3040 81D3041 81D3042 81D3043 81D3017 14D0467 14D0097 14D0469 14D0503 00K0632 32D0232
NBST27PV 81D3033 81D3034 81D3035 81D3036 81D3037 81D3038 81D3039 81D3040 81D3041 81D3042 81D3043 81D3027 14D0468 14D0098 -14D0503 00K0632 32D0232
81D3032
ACCESSORIES
Description Flex Connector Wall Switch and Wire Wall Thermostat Kit On/Off Remote Thermostat Remote Remote Receiver Cover Ember Remote Receiver Cover Metal Log Switch with Wires Universal Andirons Rock Wool Flickering Bright Embers
Part Number Flexcon 30 MVWS WT
RCB, RCMT, TLM, WMTD RCST, RCT, TLT, WWTD
RRCE RRCM ELSK UAI9 EB-RW FBE-.1G
NBST27 Unvented Gas Log Set
81D3032
27
NBST27 Unvented Gas Log Set
28
81D3032
NBST27 Unvented Gas Log Set
81D3032
29
Massachusetts Residents Only — 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.
Any residence with a direct vent product must have a CO detector installed in
the residence.
Installation of the fireplace or vented gas log in the State of Massachusetts
requires the damper to be permanently removed or welded in the fully open
position.
In addition, a naturally vented gas log may not be installed in a bedroom or
bathroom in the State of Massachusetts.
Flex line installation must not exceed 36 inches and must have a T shutoff
valve.
NOTE REGARDING VENT FREE PRODUCTS This product must be installed by a licensed
plumber or gas fitter when installed within the Commonwealth of Massachusetts.
In addition, vent free products may not be installed in a bedroom or bathroom
regardless of size or type in the State of Massachusetts.
Flex line installation must not exceed 36 inches and must have a T shutoff
valve.
CARBON MONOXIDE DETECTOR REQUIREMENTS (2) Revise 10.8.3 by adding the following additional requirements:
(a)
For all side wall horizontally vented gas fueled
equipment installed in every dwelling, building or structure used
in whole or in part for residential purposes, including those
owned or operated by the Commonwealth and where the side
wall exhaust vent termination is less than seven (7) feet above
finished grade in the area of the venting, including but not
limited to decks and porches, the following requirements shall
be satisfied:
1. Installation of carbon monoxide detectors. At the time of installation of the side wall horizontal vented gas fueled equipment, the installing plumber or gas fitter shall observe that a hard wired carbon monoxide detector with an alarm and battery back-up is installed on the floor level where the gas equipment is to be installed. In addition, the installing plumber or gas fitter shall observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building or structure served by the side wall horizontal vented gas fueled equipment. It shall be the responsibility of the property owner to secure the services of qualified licensed professionals for the installation of hard wired carbon monoxide detectors
a. In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent floor level.
b. In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner shall have a period of thirty (30) days to comply with the above requirements; provided, however, that during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm shall be installed.
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.
3. Signage. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print size no less than one-half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.”
4. Inspection. The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5.08(2)(a)1 through 4.
(b) Exemptions: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:
1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current edition of NFPA 54 as adopted by the Board; and
2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from the dwelling, building or structure used in whole or in part for residential purposes.
(c) Manufacturer requirements — Gas Equipment Venting System Provided. When the manufacturer of Product Approved side wall horizontally vented gas equipment provides a venting system design or venting system components with the equipment, the instructions provided by the manufacturer for installation of the equipment and the venting system shall include:
1. Detailed instructions for the installation of the venting system design or the venting system components; and
2. A complete parts list for the venting system design or venting system.
(d) Manufacturer requirements — Gas Equipment Venting System Not Provided. When the manufacturer of a Product Approved side wall horizontally vented gas fueled equipment does not provide the parts for venting the flue gases, but identifies “special venting systems,” the following requirements shall be satisfied by the manufacturer:
1. The referenced “special venting system” instructions shall be included with the appliance or equipment installation instructions; and
2. The “special venting systems” shall be Product Approved by the Board, and the instructions for that system shall include a parts list and detailed installation instructions.
(e)
A copy of all installation instructions for all Product
Approved side wall horizontally vented gas fueled equipment,
all venting instructions, all parts lists for venting instructions,
and/or all venting design
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.
BASIC WARRANTY MHSC 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 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. MHSC will also pay
for reasonable labor costs incurred in replacing or repairing such components
for a period of two years from the date of installation. Any products
presented for warranty repair must be accompanied by a dated proof of
purchase.
This Limited Lifetime Warranty will be void if the appliance is not installed
by a qualified installer in accordance with the installation instructions. The
Limited Lifetime Warranty will also be void if the appliance is not operated
and maintained according to the operating instructions supplied with the
appliance, and does not extend to (1) firebox/burner assembly damage by
accident, neglect, misuse, abuse, alteration, negligence of others, including
the installation thereof by unqualified installers, (2) the costs of removal,
reinstallation or transportation of defective parts on the appliance, or (3)
incidental or consequential damage. All service work must be performed by an
authorized service representative.
This warranty is expressly in lieu of other warranties, express or implied,
including the warranty of merchantability of fitness for purpose and of all
other obligations or liabilities. MHSC does not assume for it any other
obligations or liability in connection with the sale or use of the appliance.
In states that do not allow limitations on how long an implied warranty lasts,
or do not allow exclusion of indirect damage, those limitations of exclusions
may not apply to you. You may also have additional rights not covered in this
Limited Lifetime Warranty.
MHSC reserves the right to investigate any and all claims against the Limited
Lifetime Warranty and decide upon method of settlement.
IF WARRANTY SERVICE IS NEEDED…
1. Contact your supplier. Make sure you have your warranty, your sales
receipt and the model/ serial number of your MHSC product.
2. DO NOT ATTEMPT TO DO ANY SERVICE WORK YOURSELF.
MHSC
149 Cleveland Drive · Paris, Kentucky 40361 www.mhsc.com
References
- Evelon - IT-folka som bryr seg – Evelon
- Repair Your Grill: Shop Replacement Parts for 24,880 Models
- Majestic Fireplace Parts - Select From 585 Models