Monessen Hearth AVFLST42NTSC, AVFLST42PTSC User Manual
AVFLST Vent Free See Through
Fireplace System
Installation & Operating Instructions
Models: AVFLST42NTSC and AVFLST42PTSC
WARNING! If the information in this manual
is not followed exactly, a re or explosion may
result causing property damage, personal
injury or loss of life.
• Do not store or use gasoline or other
ammable 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.
– Leave the building immediately.
– 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.
• Installation and service must be performed
by a qualied installer, service agency or
the gas supplier.
This is an unvented gas-red 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 7.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
20308636 0516 Rev. 1
CONTENTS
AVFLST Vent Free Fireplace
Thank you and congratulations on your purchase of a Monessen replace.
PLEASE READ THE INSTALLATION AND OPERATION INSTRUCTIONS BEFORE USING THE APPLIANCE!
IMPORTANT: Read all instructions and warnings carefully before starting installation.
Failure to follow these instructions may result in a possible re hazard and will void the warranty.
IMPORTANT SAFETY INFORMATION ......................... 3
Building code information ............................................ 4
PRODUCT FEATURES .................................................. 5
AVFLST42 controls ..................................................... 5
Gas specications & orice size .................................. 5
Gas pressures ............................................................. 5
FIREPLACE and FRAMING DIMENSIONS .................. 6
PRE-INSTALLATION INFORMATION ........................... 7
Getting started ............................................................. 7
What you will need for installation ............................... 7
Planning the installation .............................................. 7
Adequate combustion and ventilation air .................... 7
Fireplace location ........................................................ 8
Clearances and height requirements .......................... 9
FIREPLACE INSTALLATION ...................................... 10
Secure replace to framing ....................................... 10
Finishing material ...................................................... 10
Noncombustible facing installation ............................ 10
Connect the gas .........................................................11
Check gas pressure .................................................. 12
Gas pressures ........................................................... 12
ELECTRICAL INSTALLATION .................................... 13
Wiring junction box .................................................... 13
FINAL INSTALLATION ................................................ 15
Installation of air deection glass .............................. 15
Fireglass only placement .......................................... 15
Glass and optional stone kit placement .................... 15
OPERATING INSTRUCTIONS .................................... 16
For your safety read before lighting .......................... 16
Turning on unit .......................................................... 17
To turn off gas to appliance ....................................... 17
SIGNATURE COMMAND
®
SYSTEM OPERATION ..... 18
Features .................................................................... 18
Battery installation ..................................................... 18
System conguration/setup ....................................... 18
Cold climate option .................................................... 18
Signature Command® system function settings ........ 19
Functions/operation ................................................... 20
Self diagnostics chart: ............................................... 20
Command center operations: .................................... 20
TOUCH SCREEN REMOTE CONTROL OPERATION 21
FLAME APPEARANCE & LED CONTROL ................. 27
Flame appearance .................................................... 27
Check the pilot ame ................................................. 27
Check the burner ame ............................................. 27
LED Control ............................................................... 27
MAINTENANCE and CLEANING ................................ 28
Cleaning and servicing .............................................. 28
Replacing top light bulb ............................................. 28
Replacing led strips ................................................... 28
Operating information ................................................ 30
Optional accessories ................................................. 30
OPERATION AND OPTIONAL ACCESSORIES ......... 30
TROUBLESHOOTING ................................................. 31
REPLACEMENT PARTS ............................................. 34
LIMITED LIFETIME WARRANTY ................................ 36
2
20308636
AVFLST Vent Free Fireplace
IMPORTANT SAFETY INFORMATION
INSTALLER
Please leave these instructions with the appliance.
OWNER
Please retain these instructions for future reference
.
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 re, burns,
explosion or carbon monoxide poisoning.
• Do not allow fans to blow directly into the replace. Avoid any drafts that alter burner ame 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 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. 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 materials, etc. It is imperative that control
compartments, burners and circulating air passageways be kept clean.
7. WARNING! Any change to this heater or its controls
can be dangerous.
8. Unvented gas heaters are a supplemental zone
heater. They are not intended to be the primary
heating appliance.
9. CARBON MONOXIDE POISONING: 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.
10. The installation must conform with local codes or, in
the absence of local codes, with the National Fuel
Gas Code, ANSI Z223.l/NFPA54.
11. This unit complies with ANSI Z21.11.2 Unvented
Heaters, latest edition.
12. Do not install the heaters in a bathroom or bedroom.
13. 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 replace.
14. 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.
15. Caution: Candles, incense, oil lamps, etc. produce
combustion byproducts 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 re-burned 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.
16. 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 7.
17. 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 National Fuel
Gas Code, ANSI Z223.1/NFPA 54, the International
Fuel Gas Code or applicable local codes.
18. Keep room area clear and free from combustible materials, gasoline and other ammable vapors and liquids.
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
20308636
3
IMPORTANT SAFETY INFORMATION
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 two to three
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 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
pressures in excess of 1⁄2 psig (3.5 kPa).
23. The appliance must be isolated from 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. Never burn solid fuels in a replace where a unvented
room heater is installed.
AVFLST Vent Free Fireplace
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.
BUILDING CODE INFORMATION
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
4
20308636
AVFLST Vent Free Fireplace
PRODUCT FEATURES
AVFLST42 CONTROLS
LED Control
Module
ODS Module
Command Center
Control Board
AC Module
Figure 1. AVFLST42 Controls (Control Access Door Shown Open)
GAS SPECIFICATIONS & ORIFICE SIZE
MODEL FUEL
AVFLST42NTSC NAT. 37,000 24,500 2.20 mm
AVFLST42PTSC L P. 36,000 28,500 #55
MAX. INPUT
(BTU/h)
NOTE: For LP models an external regulator is required
to reduce supply pressure to a maximum of 13" w.c.
MIN. INPUT
(BTU/h)
ORIFICE
SIZE
GAS PRESSURES
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
Setting
Pilot Regulator 3.5" w.c. —
3.5" w.c. 10" w.c.
20308636
5
FIREPLACE AND FRAMING DIMENSIONS
AVFLST Vent Free Fireplace
Minimum Rough
Framing Height
32"
[813mm]
Figure 2. Fireplace dimensions
Interior wall
installation
Wall cover
thickness
[1010mm]
[1092mm]
½"[13mm]
or
⁄"[16mm]
37½"
[953mm]
39¾"
43"
15⁄"
[386mm]
6⁄"
[154mm]
28"
[711mm]
32"
[813mm]
13⁄"
[154mm]
Minimum rough
opening depth
for 5/8" wall thickness
12"
[305mm]
Exterior wall
installation
Wall cover
thickness
Figure 3. Framing dimensions with outdoor kit installed
(AVFLSTSSODK)
6
½"[13mm]
or
⁄"[16mm]
Minimum Rough
Framing Width
44"
[1118mm]
44"
[1118mm]
Minimum rough
opening depth
for 5/8" wall thickness
14⁄"
[378mm]
48½"
[1232mm]
20308636
AVFLST Vent Free Fireplace
PRE-INSTALLATION INFORMATION
GETTING STARTED
Check to verify that all listed parts have been received.
You should have the following:
• One (1) Unvented gas heater
• Two (2) Anchoring screws
• One (1)Installation/operating instructions
• Two (2) 5" noncombustible board
• Two (2) 2" x 32" deector glass
• Two (2) Bags reglass
• One (1) 100 watt bulb
• One (1) TSFSC remote control
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 must have the following items available before proceeding with installation:
• External regulator (for propane/LPG only)
• Manual shutoff valve
• Piping which complies with local codes
• Sediment trap
• Phillips head screwdriver
• Tee joint.
• Pipe sealant approved for use with propane/LPG
(Resistant to sulfur compounds)
• Pipe wrench
WARNING!
Do not install the heater:
• Where curtains, furniture, clothing, or
other ammable objects are less than 36"
from the front of the heater.
• In high trafc areas.
• In windy or drafty areas.
PLANNING THE INSTALLATION
In planning the installation for the replace it is necessary
to determine where the unit is to be installed and whether
optional accessories are desired. Gas supply piping should
also be planned. The following steps represent the normal
sequence of installation. Each installation is unique, however, and might require a different sequence.
1. Position fireplace in desired location. Refer to the
Fireplace and Framing Dimensions (page 6, Figures 2
and 3,) Fireplace Location (page 8, Figure 5) and
Clearances and Height Requirements (page 9, Figures
6 and 7.)
NOTE: Be sure all cardboard packing material has been
removed from under the unit.
2. Install following the instructions found in this manual.
3. Field wire main power supply to junction box. Refer to
the Electrical Installation section (page 13). (Electrical
connections should only be performed by an experienced, licensed certied service person).
4. Plumb gas line. Refer to the Connect the Gas (page
11, Figure 10) section found in this manual. (Gas
connections should only be performed by an experienced, licensed/certied service person).
5. Complete nish wall material and/or surround.
ADEQUATE COMBUSTION AND
VENTILATION AIR
This heater shall not be installed in a conned space or
unusually tight construction unless provisions are provided
for adequate combustion and ventilation air.
The National Fuel Gas Code, (ANSI Z223.1/NFPA54),
denes a conned space as a space whose volume is less
than 50 cubic feet per 1,000 BTU per hour (4.8m3 per kw)
of the aggregate input rating of all appliances installed in
that space, and an unconned space 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 a conned space.
Unusually tight construction is dened 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 10
gasketed or sealed, and
b. Weather stripping has been added on openable win-
dows and doors, and
11
kg per pa/sec-m2) or less with openings
20308636
7
PRE-INSTALLATION INFORMATION
Indoor application
Exterior wall application
with AVFLSTSSODK installed
AVFLST Vent Free Fireplace
c. Caulking or sealants are applied to areas such as joints
around window and door frames, between sole plates
and oors, between wall-ceiling joints, between wall
panels, at penetrations for plumbing, electrical and gas
lines and other openings.
The following formula can be used to determine the maximum heater rating per the denition of unconned space:
BTU/Hr = (L1 + L2) Ft x (W) Ft x (H) Ft
50
Consider two connecting rooms with an open area
between, with the following dimensions:
L1 = 151/2 Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
BTU/Hr = (151/2 + 12) x (12) x (8)
50
If there were a door between the two rooms the calculation
would be based only on the room with the heater.
BTU/Hr = (151/2) x (12) x (8)
50
Counter
Fireplace
H
W
FIREPLACE LOCATION
This unvented gas heater requires no outside venting and
burns cleanly and efciency. As a zero-clearance unvented
gas heater, it can be installed recessed into any wall that is
accessible to a gas line, except in a bedroom or bathroom.
Carefully select the best location for installation of your
unvented replace. The following factors should be taken
into consideration.
• Clearance to side wall, ceiling, woodwork and window
or other combustibles. Refer to Clearance and Height
Requirements section on Page 9. Minimum clearances
to combustibles must be maintained.
• Location must not be affected by drafts caused by
kitchen exhaust fans, ceiling fans, return air registers
for forced air furnaces / air conditioners, windows or
doors.
• Installation must provide adequate ventilation and
combustion air.
• DO NOT INSTALL THIS MODEL IN A BEDROOM
OR BATHROOM.
• Location should be out of high trafc areas and
away from furniture and draperies due to heat from
rebox.
• Never obstruct the front opening of the unvented re-
place or restrict the ow of combustion and ventilation
air.
• Minimize modications to existing construction. Refer
to Figure 5 below for location suggestions.
• Do not install in the vicinity where gasoline or other
ammable liquids may be stored. The unvented rebox must be kept clear and free from the combustible
materials.
Figure 4.
WARNING!
If the area in which the heater may be operated
does not meet the required volume for indoor
combustion air, combustion and ventilation
air shall be provided by one of the methods
described in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, the International Fuel Gas
Code or applicable local codes.
8
Figure 5. Possible Fireplace Locations
FP3029
20308636
AVFLST Vent Free Fireplace
CLEARANCES AND HEIGHT
REQUIREMENTS
Ensure that minimum clearances shown in Figures 6 and
7 are maintained. Left and right clearances are determined
when facing the front of the rebox.
Follow these instructions carefully to ensure safe installation. Failure to follow these requirements may create a
re hazard.
Sidewall Clearances — The clearance from the inside of
the appliance to any combustible adjacent wall should not
be less than 6". Figure 6
Ceiling Clearance — The ceiling or any other combustible
material must be at least 36" from the rebox opening.
Figure 6
36" Minimum
From Opening
12
" Max.
Depth
PRE-INSTALLATION INFORMATION
WARNING!
The dimensions shown in Figures 5 and 6
are minimum clearances to maintain when
installing this heater. Left and right clearances
are determined when facing the front of the
heater.
Follow these instructions carefully to ensure
safe installation. Failure to follow instructions
exactly can create a re hazard.
Floor Clearance — The replace may be installed directly
on a combustible oor or a raised platform of an appropriate
height. Do not place replace on carpeting, vinyl, tile or
other soft oor coverings. It may, however, be placed on at
wood, plywood, particle board or other hard surfaces. Be
sure replace rests on a solid continuous oor or platform
with appropriate framing for support so that no cold air can
enter from under the rebox.
Mantel clearances — Must meet the clearance requirements detailed in Figures 6 and 7.
Wall
12"
Stud
Insulation
Board
" Min.
6
Figure 6. Sidewall and Ceiling Clearances
1
2
/2" Max
Depth
28
" Min.
From Opening
18
" Min.
From Opening
FP3006
28"
Top of Fireplace
Opening
SIDE VIEW
Fireplace
Opening
TOP VIEW
23"
6"
18"
1"
2¹⁄₂"
3"
Standoff
1
2
/2"
FP3007
1¹⁄₂"
3¹⁄₂"
4¹⁄₂"
45°
5"
6"
FP3008
20308636
Figure 7. Mantel Clearances
9
FIREPLACE INSTALLATION
44"
SECURE FIREPLACE TO FRAMING
AVFLST Vent Free Fireplace
The replace must be secured to the framing studs as
shown in Figure 8. Use four (4) screws to attach replace
to framing. The side nailing anges are 1⁄2" or 5⁄8" to accommodate different wall thickness.
WARNING!
Never install combustible materials over front
face of replace.
FINISHING MATERIAL
NOTE: Any remote wiring (i.e. remote control, wall
switch), must be done prior to nal nishing to avoid costly
reconstruction.
Only noncombustible materials (i.e. brick, tile, slate, steel,
or other materials with a UL re rating of Zero) may be
used to cover the black painted face of the appliance. It is
permissible to bring combustible wall board to the top of
the standoffs on the top and to the wall board stand-offs
on the sides of the unit. A 300°F minimum adhesive may
be used to attach facing materials to the black surface. If
joints between the nished wall and the replace surround
are sealed, a 300°F minimum sealant material (General
Electric RTV103 or equivalent) must be used.
NOTE: Fireplace may be installed on top of framing or
platform constructed of combustible materials which do
not protrude beyond the face.
Noncombustible Material
Framing
Members
Nailing
Flange
Screws
Nailing
Flange
Figure 8. Secure Fireplace to Framing Studs
5”
Screws
Nailing
Flange
NONCOMBUSTIBLE FACING INSTALLATION
CAUTION: The noncombustible wall board supplied with
this unit can be damaged if dropped or struck. Handle
with care.
1. Using drywall screws, secure the noncombustible board
to the two brackets on top of the unit. IMPORTANT: To
avoid cracking the board, pre-drill holes prior to securing
to the unit/framing.
2. Wipe any debris or dust from the noncombustible board
and drywall.
3. It is highly recommended to prime the facing using a
quality primer prior to taping and mudding. This will
ensure proper adhesion of both the tape and mud. The
supplied board is very porous.
4. Tape the seams using a mesh type tape.
5. Mud seams as normal. We recommend using a product
called Durabond high strength compound for the rst
coat. This product can be purchased at any hardware
store. Follow manufacturer's recommendations for curing
the mud. NOTE: Depending upon the nal nishing
method, use a minimum rated 300 degree sealant, drywall compound or thin set to seal the side and top joints.
6. Prime wall for a second time for proper adhesion of paint.
Supplied noncombustible board
43"
MOUNTING POINTS
32"
Figure 9. Noncombustible board installation
5"
10
20308636
AVFLST Vent Free Fireplace
CONNECT THE GAS
NOTICE: A qualied gas appliance installer must connect
the heater to the gas supply. Consult all local codes.
WARNING!
This appliance is equipped for either natural or propane
gas. Field conversion is not permitted.
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 sulde 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
ow 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
10
A sediment trap should be installed upstream
to prevent moisture and contaminants from
passing through the pipe to appliance controls
and burners. Failure to do so could prevent the
appliance from operating reliably. Figure 10
FIREPLACE INSTALLATION
WARNING!
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.
IMPORTANT: Loosen the pipe adapter on the ex tube
before installing to the system piping.
Always use an external regulator for all propane/LPG heaters 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.
When tightening the joint to the valve, hold the valve
securely to prevent movement.
Test all gas joints 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.
WARNING!
Connecting directly to an unregulated
propane/LP tank can cause an explosion.
WARNING!
DO NOT USE OPEN FLAME TO CHECK FOR
GAS LEAKS.
To Fireplace
Stainless
Flexible Tube
Figure 10. Gas Connection
20308636
Manual Shutoff
Valve
Sediment
Trap
Pipe
Coupling
Pipe
Tee Joint
Pipe Nipple
Cap
Locations Pressure Tapping
Point Installation
Gas Supply
Inlet
3" minimum
FP2447
11
FIREPLACE INSTALLATION
AVFLST Vent Free Fireplace
CHECK GAS PRESSURE
Figure 11
Check the gas pressure with the appliance burning and
the control set to HIGH.
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
Open control access door at bottom front of unit to nd
valve and regulator.
Turn captured screw counterclockwise two or three turns
and then place tubing to pressure gauge over test point.
Use test point “A” closest to gas inlet. If the pressure is not
within the range listed for your gas type turn the valve regulator until it is within range. After taking pressure reading,
be sure and turn captured screw clockwise rmly to reseal.
Do not over torque. Check for gas leaks.
GAS PRESSURES
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
Setting
Pilot Regulator 3.5" w.c. —
3.5" w.c. 10" w.c.
Test Port 'A'
FP3036
Figure 11. Pressure Test Point Location – Signature Command® Valve
12
20308636
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