Monessen Hearth CFX24, CFX32 User Manual
Vent-free Fireplace Systems
Models: CFX24, CFX32
Natural Gas or LP, Millivolt
Installation and Operating Instructions
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.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
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
9.
20301726 3/10 Rev. 1
CFX Vent Free Fireplace System
CONTENTS
CFX Series gas log appliances described in this manual feature the
TRIPLE PLAY BURNER SYSTEM
producing a full random yellow flame, full depth ember bed and glowing logs.
Important Safety Information .....................................3
Product Features and Specifications ........................ 5
Gas Pressures ........................................................5
Gas Specifications ..................................................5
Igntion Controls ....................................................... 5
Pilot ......................................................................... 5
Thermal Generator .................................................. 5
Fireplace & System Dimensions ............................. 6
Getting Started ............................................................. 7
Combustion and Ventilation Air ................................ 8
Fireplace Installation ................................................... 9
Location of Fireplace ............................................... 9
Clearances and Height Requirements ................. 10
Remove Screen .................................................... 11
Install Mantel ......................................................... 12
Firebox to Mantel Installation ................................ 13
Install Optional Firebrick Panels ........................... 14
Connecting the Gas .................................................. 15
Check Gas Type ...................................................15
Install Gas Piping to Fireplace/Burner .................. 15
Connect the Gas ................................................... 16
Check Gas Pressure ............................................. 17
®
with exclusive triple effect technology
Electrical Wiring (Milli-volt) ......................................18
Connect Optional Wall Switch or Thermostat ....... 18
Connect Remote Receiver .................................... 19
Check System Operation ...................................... 19
Log Placement .......................................................... 20
Flame Appearance ............................................... 22
Place Rock Wool ................................................... 21
Check Pilot and Burner Flame Appearance .......... 22
Operating Instructions ............................................. 23
For Your Safety Read Before Lighting .................. 24
Milli-Volt Control Lighting Instructions .................. 25
Match Lighting Instructions ..................................26
Cleaning and Servicing ............................................ 26
Blower and Optional Equipment .............................. 27
Troubleshooting ........................................................ 28
Replacement Parts
Face Parts ............................................................. 30
Burner Parts .......................................................... 31
Warranty .................................................................... 35
2
20301726
IMPORTANT SAFETY INFORMATION
CFX Vent Free Fireplace System
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 a vent-free gas heater in this firebox.
• 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.
WARNING
• 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 appl iance 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 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. This unit complies with ANSI Z21.11.2 unvented heaters standard.
10. Do not install the CFX Model in a bathroom or bedroom.
11. 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.
12. 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.
13. 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.
14. An unvented gas-fired heater uses air (oxygen) from
the room in which it is installed. Provisions for adequate
combustion and ventilation air must be provided. See
installation guidelines.
15. Keep room area clear and free from combustible
materials, gasoline and other flammable vapors and
liquids.
16. Unvented gas heaters are a supplemental zone heater.
They are not intended to be a primary heating appliance.
17. 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.
.
20301726
3
CFX Vent Free Fireplace System
IMPORTANT SAFETY INFORMATION
18. 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 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.
19. 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.
20. 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).
21. 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).
22. 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.
23. Never burn solid fuels in a fireplace where a unvented
room heater is installed.
24. Always have a fireplace screen in place when the
appliance is in operation, and unless other provisions
for combustion air are provided, the screen shall have
an opening(s) for induction of combustion air.
25. Do not fill spaces around the firebox with insulation or
other materials. These spaces must be maintained to
prevent the firebox from coming in contact with combustible materials.
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.
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
4
20301726
PRODUCT FEATURES & SPECIFICATIONS
HI/LO Control Knob
Control Knob
Figure 1 Unvented Gas Heater
(Control Access Door Shown Open)
On/Off Switch
Piezo Ignition
FP2750
OPERATION
This unvented gas heater requires no outside venting and
burns cleanly with high heating efficiency.
This zero-clearance unvented gas heater can be installed
against any wall that is accessible to a gas line.
GAS PRESSURES
Control Fuel Millivolt
Regulator Pressure Nat. 3.5” w.c.
Pilot Regulator Nat. 3.5” w.c.
Max. Inlet Pressure Nat. 10.5” w.c.
Min. Inlet Pressure Nat. 5.0” w.c.
Regulator Pressure LP 10.0” w.c.
Max. Inlet Pressure LP 13.0” w.c.
Min. Inlet Pressure LP 11.0” w.c.
CFX Vent Free Fireplace System
IGNITION CONTROLS
Piezo ignitor allows ignition of the pilot without the use of
matches or batteries.
Milli-Volt 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 stand-
ing pilot.
ON - Valve position to turn ON/OFF log set
with remote switch/thermostat.
LOW/HI - Variable position to control flame height
(heat output). Both front and rear burners are in operation to provide realistic
glow and yellow flame.
PILOT
The gas log heater is fitted with a specially designed safety
pilot light 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 milli-volt gas log pilot is fitted with a milli-volt generator
to provide power for remote activation.
GAS SPECIFICATIONS
Input BTU/hr
Model Fuel Control Max. Min.
CFX24NV Nat. Millivolt 22,000 17,000
CFX24PV LP Millivolt 22,000 17,000
CFX32NV Nat. Millivolt 26,000 20,000
CFX32PV LP Millivolt 26,000 20,000
NOTE: For LP models an external regulator is required
to reduce supply pressure to a maximum of 13" w.c.
20301726
5
CFX Vent Free Fireplace System
E
D
C
A
B
F
G
H
I
H
FIREPLACE & SYSTEM DIMENSIONS
Figure 2 Firebox Dimensions
Ref. CFX24 CFX32
A 11C\v" (299 mm) 15Z\v" (387 mm)
B 19C\v" (502 mm) 26" (660 mm)
C 26M\," (683 mm) 33" (838 mm)
D 52Z\x" (1334 mm) 61>\zn" (1564 mm)
E 44' (1118 mm) 50C\v" (1289 mm)
F 26B\," (676 mm) 30B\," (778 mm)
G 4Z\x" (114 mm) 4" (102 mm)
H 15" (381 mm) 18Z\v" (464 mm)
I 11Z\x" (292 mm) 14M\," (378 mm)
6
20301726
GETTING STARTED
CFX Vent Free Fireplace System
GETTING STARTED
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 heater
• Two (2) 90°-angle brackets
• Facing
• Installation/operating instructions
• Two (2) anchoring screws
• Cabinet
• Ceramic fiber logs
• Four (4) black screws
Millivolt controlled heater designed to be operated with
optional devices for ON/OFF functions.
• Hand held Remote with receiver
• Wall T-stat with 20' wire
• Wall switch with 20' wire
• Hand held Thermostat Remote
• Gloves are recommended when handling
ceramic fiber logs to prevent skin irritation
from loose fibers. Logs are fragile —
handle with care.
CAUTION
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)
• Piping which complies with local codes
• Phillips head screwdriver
• Pipe sealant approved for use with propane/LPG
(Resistant to sulfur compounds)
• Pipe wrench
Do not install the heater:
• Where curtains, furniture, clothing, or
other flammable objects are less than
42" from the front of the heater.
• In high traffic areas.
WARNING
• In windy or drafty areas.
In planning the installation for the fireplace 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. Determine desired location for fireplace. Refer to the
Location of Fireplace and Clearances and Height
Requirements sections in this manual.
NOTE: Be sure all packing material has been removed
from underside the unit.
2. Assemble mantel and install fireplace according to the
instructions in this manual.
2. Install logs per instructions found in this manual.
3. Field wire main power supply to units with fan kit. Refer
to the Electrical Section found in this manual. (Electrical
connections should only be performed by an experienced, licensed certified tradesman).
4. Install optional ON/OFF kit on units with millivolt control.
Refer to the installation instructions included with the
kit and also refer to the Electrical Wiring section found
in this manual.
5. Plumb gas line according to the Connecting the
Gas section found in this manual. (Gas connections
should only be performed by an experienced,
licensed/certified tradesman).
20301726
7
CFX Vent Free Fireplace System
W
H
COMBUSTION and VENTILATION AIR
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/NFPA54), 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, and an unconfined 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 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;
b) weather striping has been added on openable windows and doors, and
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 pen-
etrations for plumbing, electrical, and gas lines, and at other openings.
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
Consider two connecting rooms with an open area between, with the following dimensions:
L1 = 15Z\x Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
BTU/hr =
If there were a door between the two rooms the calculation would be based only on the room
with the heater.
BTU/hr =
(15Z\x + 12) x (12) x (8)
50
(15Z\x) x (12) x (8)
50
Room Divider
Fireplace
x 1000 = 52800 BTU/hr
x 1000 = 29,760 BTU/hr
If the area in which the heater may be
operated is smaller than that defined as
an unconfined space or if the building is
FP2439
of unusually tight construction, provide
adequate combustion and ventilation air by
one of the methods described in the National
WARNING
Fuel Gas Code, ANSI Z223.1/NFPA54,
Section 5.3 or applicable local codes.
Figure 3 Example of a Large Room with a Room
Divider
8
20301726
FIREPLACE INSTALLATION
Carefully select the best location for installation of your unvented fireplace. The following factors should
be taken into consideration.
CFX Vent Free Fireplace System
• Clearance to side wall, ceiling, woodwork and window or other combustibles. Refer to Clearances
and Height Requirements section on Page 10. Minimum clearances to combustibles must be main-
tained.
• Location must not be affected by drafts caused by kitchen exhaust fans, ceiling fans, return air reg-
isters for forced air furnaces/air conditioners, windows or doors.
• Installation must provide adequate ventilation and combustion air.
• DO NOT INSTALL THE CFX MODEL IN A BEDROOM OR BATHROOM.
• Location should be out of high traffic areas and away from furniture and draperies due to heat from
firebox.
• Never obstruct the front opening of the unvented fireplace or restrict the flow of combustion and
ventilation air.
• Do not install in the vicinity where gasoline or other flammable liquids may be stored. The unvented
firebox must be kept clear and free from the combustible materials.
20301726
FP2110a
Figure 4 Suggested Locations
9
CFX Vent Free Fireplace System
9”
Min.
9”
Min.
42”
Min.
CLEARANCES and HEIGHT REQUIREMENTS
Ensure that minimum clearances shown in Figure 5 are maintained. Left and right clearances are deter-
mined when facing the front of the firebox.
Follow these instructions carefully to ensure safe installation. Failure to follow these requirements may
create a fire hazard.
1. Sidewall Clearances — The clearance from the inside of the appliance to any combustible adjacent
wall should not be less than 9". Figure 5
2. Ceiling Clearance — The ceiling must be at least 42" from the top of the firebox opening. Figure 5
3. Back Wall Clearance — The appliance may be placed against a combustible back wall.
Figure 5 Clearances and Height Requirements
The dimensions shown in Figure 5 are minimum clearances to maintain
in 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
WARNING
to follow instructions exactly can create a fire hazard.
10
FP2111a
20301726
GENERAL INSTALLATION INFORMATION
CFX Vent Free Fireplace System
REMOVE SCREEN
Figure 6
1. Remove bottom access door.
2. Remove fireplace screen frame panel by pushing screen frame panel up and out.
Do not operate the unit without the screen
frame panel installed.
WARNING
20301726
FP2109a
Figure 6 Remove Fireplace Screen Frame Panel
NOTE: Fireplace screen must be removed to access log box.
11
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