Vermont Castings NBST27 User manual
Installation Instructions
NBST27
cover
81D3032 3/13 Rev. 6
2
NBST27 Unvented Gas Log Set
Codes
Gas Pressures ................................................5
Gas Specications ..........................................5
Ignition Controls ..............................................5
Pilot/ODS ........................................................5
Thermal Generator .........................................5
Placement in a Fireplace with a Restrictive Bar-
rier ..................................................................6
Floor Clearance .............................................9
Millivolt ..........................................................12
Optional Wall Switch or Thermostat .............13
Remote Receiver ..........................................14
Checking System Operation .........................14
Rockwool and Ember Placement .................15
Log Placement ..............................................16
Pilot Flame ....................................................19
Burner Flame ................................................19
For Your Safety Read Before Lighting ..........20
Millivolt Control Lighting Instructions ............21
To Turn Off Gas to Heater.............................21
Match Lighting Instructions ...........................22
3
NBST27 Unvented Gas Log Set
Please leave these instructions with the appliance.
Please retain these instructions for future reference
.
Read these instructions carefully before installing or trying to operate this vent-free gas heater.
1. Due to high temperatures, the appliance should be
located out of trafc 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 ammable 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 qualied
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. Early signs of
carbon monoxide poisoning are similar to the u 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
10. This unit complies with ANSI Z21.11.2 Unvented Heat-
ers, latest edition and also complies with ANSI Z21.60
Decorative Vented Appliances for Solid Fuel Burning
Fireplaces, latest edition. State and local codes may
only allow operation of this appliance in a vented con-
guration. Check your state or local codes. For vented
operation, see “Vented Instructions” in this manual.
11. Do not install the heaters in a bathroom or bedroom.
12. Correct installation of the ceramic ber logs, proper
location of the heater, and annual cleaning are neces-
sary to avoid potential problems with sooting. Sooting,
resulting from improper installation or operation, can
settle on surfaces outside the replace. See log place-
ment instructions for proper installation.
13. Avoid any drafts that alter burner ame patterns. Do not
allow fans to blow directly into replace. Do not place
a blower inside burn area of rebox. Ceiling fans may
create drafts that alter burner ame patterns. Sooting
and improper burning will occur.
14. Candles, incense, oil lamps, etc. produce
combustion by-products including soot. Vent-free
appliances will not lter 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. Provi-
sions for adequate combustion and ventilation air must
be provided. Refer to
16. This heater shall not be installed in a room or space
unless the required volume of indoor combustion air is
provided by the method described in the
, the
or applicable local codes.
17. Keep room area clear and free from combustible
materials, gasoline and other ammable vapors and
liquids.
18. Unvented gas heaters are a supplemental zone heater.
They are not intended to be the primary heating appli-
ance.
4
NBST27 Unvented Gas Log Set
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, lms 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.
21. 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.
22. 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 pres-
sures in excess of 1/2 psig (3.5 kPa).
23. 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).
24. Do not use this room heater if any part has been under
water. Immediately call a qualied 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.
25. This appliance must not be used with glass doors in
the closed position. This can lead to pilot outages and
severe sooting outside the replace.
26. Never burn solid fuels in a replace where a unvented
room heater is installed.
27. Always have a replace 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.
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…
1430 Broadway
New York, NY 10018
or
Batterymarch Park
Quincy, MA 02269
5
NBST27 Unvented Gas Log Set
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 con-
trolled 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.
You should have the following items available before pro-
ceeding 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
Natural *Propane (LP)
Inlet Minimum 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. --
An external regulator is required to reduce supply pres-
sure to a maximum of 13” w.c.
NBST27NV Nat. Millivolt 39,000 26,000
NBST27PV LP Millivolt 39,000 30,000
Piezo ignitor allows ignition of the pilot without the use of
matches or batteries.
- All gas to the gas logs is shut off at the valve.
- Valve position to light/maintain a standing pilot.
- Valve position to turn ON/OFF log set with
remote switch/thermostat.
- Variable position to control ame height
(heat output).
The gas log heater is tted 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.
The millivolt gas log pilot is tted with a milli-volt (thermo-
pile) generator to provide power for remote activation.
National
Fuel Gas Code, ANSI Z223.1/NFPA 54
International Fuel Gas Code
6
NBST27 Unvented Gas Log Set
Exception:
The NBST27 unvented room heater is approved for instal-
lation into the following unvented replaces:
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. 2-
97 ANSI Z21.91-2001 (typically referred to as a "Universal
Firebox"), as long as rebox hearth dimensions meet the
minimum hearth dimensions shown below.
32”
2156O”
2156O”
FP2361
fireplace dims
Figure 1 -
Hearth Minimum Dimensions for Solid
Fuel Burning Fireplaces and UL127
Factory Built Fireplaces
FP2361
The following are guidelines for placing a gas log set in
a replace that has a restrictive barrier along the bottom
front opening of the replace. Some examples of barri-
ers are glass/screen door frames and sunken/recessed
replaces.
No Restriction 21Z\x”
1/2” to 1Z\x” 25Z\v”
Greater than 1Z\x” to 3” 27Z\v”
Greater than 3” *
*Any barrier greater than 3” placed in front of the gas log
set is not recommended by the manufacturer.
Non combustible material such as refractory brick
may be used to line the oor of the replace 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.
If the log set is equipped with a remote receiver, a
restrictive barrier may reduce the battery life by increasing
the ambient temperature inside the replace. Placement
of the receiver outside of the replace will extend the
battery life.
FP2362
fireplace barrier
X
Glass door frames
with adjustable
louvers should have
the louvers fully
open while the unit
is in operation
Height of restrictive barrier
caused by glass door frames,
recessed replaces, etc. from
the base or bottom surface of
the unit. (Refer to Table)
Refer to
Table
FP2362
Figure 2 -
Reference Drawing of NBST27 Log Set in an Enclosure
7
NBST27 Unvented Gas Log Set
Figures 3 through 9
The sides of the re-
place opening must be at least 1C\v" from any combustible
wall. The ceiling must be at least 42" from the top of the
replace opening. The wall parallel to the side of the heater
must be at least 36” from the side of the heater. Refer to
your rebox owners manual for more information.
42” 36”
36”
16M”
FP2363
clearances
Figure 3 -
Sidewall and Ceiling Clearances
FP2363
1. If installing unit into an unvented rebox, minimum
required clearances listed in the rebox installation
manual must be met.
2. If installing unit into a vented rebox with a working
damper, minimum clearances shown in through
10 must be met
3. If installing unit into a vented rebox with a damper that
is always open, no minimum clearances are required.
To install the gas logs into a replace with no wooden
mantel, shelf or other combustible projection above the
replace opening, measure the heat resistant material
height, TABLE A.
Heat resistant materials such as slate and marble must
IMPORTANT: If the unit is installed in a vented replace
and cannot meet these minimum clearances you must
operate the heater with chimney ue damper open. Refer
to “Installing Vented Applications” on .
FP2364
Heat resist matl
Measure This
Distance
Heat Resistant
Material
Heater in
Fireplace or
Firebox
FP2364
Figure 4 -
Measure Heat Re-
sistant Material
12” or more Hood not required
8” to less than 12” Extend heat resistant material to
12” or install hood.
Less than 8” Extend heat resistant material to
at least 8” and install hood.
extend heat resistant material to
a height of at least 12”
8
NBST27 Unvented Gas Log Set
To install the heater with a wooden mantel, shelf or other
combustible projection above, rst measure the heat resis-
tant material shown in then refer to Table B.
FP2365
heat resist w/hood
8” or
More
of Heat
Resistant
Material
Hood
Heater in Fire-
place or Firebox
FP2365
Figure 5 -
Measure Heat Resistant
Material for Mantel
12” or more Hood not required. Observe prole (side
elevations) shown in .
8” to less than 12” Install hood and observer proles shown
in; extend heat resistant
material to at least 12” and observe
proles shown in .
Less than 8” Extend heat resistant material to at least
8”, install hood and observe proles
shown in ; extend heat
resistant material to at least 12” and
observe proles shown in .
FP2366
mantel clear no hood
12”
Min.
28”
10” or Less
Heat Resistant
Material
Heater in
Fireplace
or Firebox
FP2366
The bottom of the mantel
may project from the wall a
maximum of 10” at a mini-
mum of 28” above the re-
box.
Figure 6 -
Minimum Mantel Clearance
with No Hood
256O”
12”
13”
24”
FP2367
mantel clearance with hood
Heat Resistant
Material
Heater in
Fireplace
or Firebox
Hood
FP2367
A mantel may project from the wall a maximum of 2Z\x” at a
minimum of 13” above the opening, and a maximum of 12”
at a minimum of 24” above the opening.
Figure 7 -
Minimum Mantel
Clearance with Hood
9
NBST27 Unvented Gas Log Set
The gas log heater must be installed at least 3/4" above any combustible ooring material,
such as carpeting or tile, which is closer than 14" to the base of the replace. The minimum
distance must be maintained from the top surface of carpeting, tile, etc.
3/4”
FP2368
combustible floor
Combustible
Material
FP2368
Heater in Fire-
place or Firebox
Figure 8 -
Minimum Clearance above Combustible Flooring
14” Min.
FP2369
comb floor
Heater in
Fireplace or
Firebox
Combustible
Material
This Distance may now
be Less Than 3/4”
FP2369
Figure 9 -
Minimum Clearance above Combustible Flooring with
Noncombustible Material Installed at Base of Fireplace
The gas log heater may be installed nearer to the oor if a minimum of 14" of noncombus-
tible material such as slate or marble is installed between the base of the replace and the
combustible ooring.
10
NBST27 Unvented Gas Log Set
• Turn the gas supply to the replace or rebox.
• 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.
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.
• Turn off gas supply to replace or rebox.
• Have the replace oor 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 oor or wall of replace. If not, drafting may cause
pilot outage or sooting. Use a heat-resistant sealant.
Do not seal chimney ue damper.
Exception:
FP2370
damper
Damper Stop
Damper
FP2370
Figure 10 -
Damper Stop Installation
(Refer to WARNING at top of page)
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
to prevent full closure of the replace damper blade and
provide a minimum 29 square inch ue opening.
for installations in the Commonwealth
of Massachusetts.
11
NBST27 Unvented Gas Log Set
1. Center the gas log unit in the replace or rebox. Make certain the front feet of the grate
sit inside the front edge of the replace or rebox.
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 replace/rebox oor. Drill two (2) 5/32” diam-
eter holes approximately 1Z\x” deep.
3. Anchor the unit to the replace/rebox oor using the
screws provided.
For right corner installations, the piezo ignitor
can be moved to the opposite corner of the ap-
pliance:
1. Remove wire from back of ignitor.
2. Remove two (2) screws holding piezo brack-
et.
3. Reattach bracket on the opposite corner
(where inlet fuel comes into the valve) by us-
ing two clearance holes on burner base.
4. Reattach wire to ignitor.
FP2375
secure burner
FP2375
Figure 11 -
Secure Burner
Piezo Ignitor
(Original Location)
12
NBST27 Unvented Gas Log Set
Figure 12
A qualied gas appliance installer must connect
the heater to the gas supply. Consult all local codes.
Hold heater valve rmly 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.
FP2371
gas connect
To
Heater Valve
Pipe
Possible Locations
for Pressure Tap-
ping Point
Gas
Supply
Inlet
Manual Shut-off Valve
Pipe Coupling
Stainless Flex-
ible Tube, Pipe
or Metal Tube
FP2371
Figure 12 -
Gas Connection
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.
Check the gas pressure with the appliance burning and
the control set to .
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 clock-
wise rmly 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.
FP2372
millivolt valve
Test Port “OUT”
Figure 13 -
Pressure Test Point Location Millivolt Control
FP2372
13
NBST27 Unvented Gas Log Set
The Millivolt valve is a self-powered combination gas con-
trol THAT DOES NOT REQUIRE 110VAC TO OPERATE.
TH = 3
TP = 1
TP/TH = 2
FP2267
millivolt wiring
ON/OFF Switch
or Optional Wall
Switch, Remote
or T-Stat
Log
Switch
Millivolt Valve
ODS Pilot
ODS Pilot
FP2267
Figure 14 -
Wiring Diagram
Log switch wires are not fac-
tory connected. Connect log switch
wires to the TH/TP and TH valve
terminals.
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
NBST27 Unvented Gas Log Set
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.
Heat reduces battery life. Protect the receiver and
extend battery life by mounting receiver in wall or other
location outside the replace.
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.
A Complete 2 & 3 Closed Minimum 175
System
B Thermopile 1 & 2 Open Minimum 500
Output
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 au-
tomatic 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 read-
ing, proceed to Section B.
B. Thermopile Output Reading Check
(“B” Reading - thermostat contacts OPEN - Main burn-
er 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.
FP2376
remote switch
Remote
Wires
Remote
Receiver
Remote Wire
Connectors
Valve
FP2376
Figure 15 -
Install Remote Receiver
15
NBST27 Unvented Gas Log Set
- This unit is supplied with 10 ceramic
ber logs. Do not handle the logs with bare hands. Always
wear gloves to prevent skin irritation from ceramic bers.
After handling the logs, wash your hands gently with soap
and water to remove any traces of bers.
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. . Wash
hands after placing rock wool. Skin irritation may oc-
cur.
2. Place ickering bright embers (FBE-.1G) before plac-
ing 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 deectors 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.
LG649
NBST embers
Flickering
Bright Embers
Rock wool
LG649
Figure 17 -
Place Flickering Bright Embers
LG648
NBST rockwool
Pilot
Rockwool
Rock Wool
LG648
Figure 16 -
Place Rock Wool
Horizontal
Grate Bar
Grate Tine
Grate Tines
Horizontal
Grate Bar
16
NBST27 Unvented Gas Log Set
LG653
NBST Log 4
Log #4
LG653
Figure 21 -
Place Log #4
LG651
NBST log 2
Log #2
Figure 19 -
Place Log #2
LG651
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 rmly
seated on the grate bar.
LG650
NBST log 1
Log 1
Control
Valve
LG650
Begin on Side A, valve on left as
you face the replace.
1. Place log #1 on burner by
aligning two (2) holes on bot-
tom 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 18 -
Place Log #1
LG652
NBST Log 3
Log #3
LG652
Figure 20 -
Place Log #3
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 ller bracket
surrounding the pilot assembly.
4. Place log #4 by aligning the ‘V’ notch
on bottom of log with horizontal grate
bar between tines as shown in
. Place the rectangular notch on bot-
tom of log onto the matching rectangu-
lar protrusion on log #1.
17
NBST27 Unvented Gas Log Set
LG654
NBST log 5
Log #5
LG654
Figure 22 -
Place 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.
LG655
NBST log 6
Log #6
Log #1
Control Valve
LG655
Figure 23 -
Place Log #6
6. Place log #6 on pilot end of burner by aligning
the ‘V’ notch in bottom of log with the ller brack-
et surrounding the pilot. Place the rectangular
notch in the bottom of the log onto the rectangu-
lar protrusion on the end of log #1.
LG656
NBST log 7
Log #7 LG656
Figure 24 -
Place Log #7
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 rmly seated on grate
bar.
18
NBST27 Unvented Gas Log Set
LG657
NBST Log 8
Log #8
LG657
Figure 25 -
Place Log #8
8. Place log #8 by aligning ‘V’
notch in bottom of log with
the horizontal grate bar
between tines as shown in
. Place the rect-
angular notch on bottom
of log onto rectangular
protrusion on middle of log
#1.
LG658
NBST log 9
Log #9
LG658
Figure 26 -
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 protru-
sion on log #8.
LG659
NBST Log 10
Log #10
LG659
Figure 27 -
Place Log #10
10. Place log #10 by aligning two (2) rectangular
notches on bottom of log with rectangular pro-
trusions on logs #6 & #7. Make sure the ember
or ‘burnt’ area of log is facing center of burner.
19
NBST27 Unvented Gas Log Set
In addition, periodically check the ames visually during operation.
It should just touch
the top of the thermocouple tip for natural. Refer tofor correct pilot ame.
If the pilot ame does not touch the thermocouple, then the main burner cannot function reliably.
for incorrect shape of pilot ame.
FP2272
pilot correct flame
Thermocouple for
Natural Gas
Thermocouple
for LP
FP2272
Figure 28 -
Correct Pilot Flame Appearance
FP2273
pilot bad flame
Thermocouple for
Natural Gas
Thermocouple
for LP
FP2273
Figure 29 -
Incorrect Pilot Flame Appearance
LG661
NBST log flames
In normal operation at full rate after 15 minutes, the ames
should appear as shown in .
The ames should be yellow and extend 3-4” above the
log top surfaces. The yellow ames should not impinge
on the logs.
Figure 30 -
Correct Burner Flame Appear-
ance
LG661
20
NBST27 Unvented Gas Log Set
Do not allow fans to blow directly into the replace.
Do not place a blower inside the burn area of the rebox. Ceiling fans may create drafts that alter ame
patterns. Sooting and improper burning will result.
During manufacturing, fabricating and shipping, various components of this appliance are treated with
certain oils, lms 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.
The initial break-in operation should last four hours with the burner at the highest setting. Provide maxi-
mum 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 replace.
This appliance is equipped with a piezo ignition device which lights the pilot. If piezo is not working properly
see
BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the oor because
some gas is heavier than air and will settle on the oor.
• Do not attempt to light any appliance.
• 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 re
department.
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 qualied
service technician. Force or attempted repair may
result in a re or explosion.
Do not use this appliance if any part of it has been
under water. Immediately call a qualied service
technician to inspect the appliance and to replace
any part of the control system and any gas control
that has been under water.
FP2373
burner controls
Control Knobs
Piezo Ignitor
FP2373
Figure 31 -
Burner Controls
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