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
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.
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.
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 CFX32A 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
CFX Vent Free Fireplace System
INSTALL MANTEL
1. Place base near final position. Make sure you have access to all four (4) sides.
2. Place sides in the approximate location on base. Align back edge of side with back of base.
Secure joining block #1 to bottom of side using two (2) 1Z\v” screws. Be sure joining block is
flush with bottom of side piece. (Do not attach to base at this time)
3. With the aid of an assistant, and using two (2) joining block #4 and (12) 1Z\v” screws, secure
header to the sides. Carefully match the moulding.
4. Adjust cabinet assembly so it is centered from side to side and the back of the sides are aligned
with the back of the base.
5. Temporarily place top on side/header assembly. Adjust sides parallel to the base and top side.
Secure the sides to the base using two (2) 1Z\v” screws in each of the joining blocks.
6. Once the mantel is assem-
bled, temporarily place the
fireplace into the mantel in or-
Top
Joining Block #4
Header
der to locate the trim pieces.
7. Center the fireplace in the
opening with the inside of the
fireplace trim or facing even
with the inside of the front of
the mantel.
8. Attach the horizontal trim
piece to the mantel header.
Make sure the horizontal
trim is centered and there
is an approximate 1/4” gap
between the bottom of the
horizontal trim and the top of
the fireplace. Secure with two
(2) screws; one on each end
of the trim piece in the predrilled holes.
Right
Side
Joining
Block #1
Joining
Block #3
Vertical
Trim
Joining
Block #2
Horizontal Trim
Joining
Block #3
Vertical Trim
Joining
Block #2
9. Place the vertical trim pieces
so the edge is about 1/4” from
the fireplace body. Make sure
the joint between the trim
pieces is satisfactory. Secure
through joining block #3 into
Figure 7 Barrington Mantel
Base
Joining
Block #1
horizontal trim using two (2)
screws. Attach joining block #2 to the bottom of the vertical trim. Repeat for other side.
10. Remove fireplace and move mantel to its final position. Cut wall base moulding as necessary
to provide adequate fit against wall.
11. Locate (anti-tip) bracket on wall so the cleat on the underside of the
mantel top is captured in the wall bracket and the wall bracket is screwed
into a stud.
Joining
Block #4
Left Side
KT1220
12
Figure 8 Wall Bracket
20301726
FIREPLACE INSTALLATION
CFX Vent Free Fireplace System
FIREBOX TO MANTEL INSTALLATION
1. Slide fireplace into mantel.
2. Use the two (2) 'L' brackets provided to secure the fireplace to the mantel. Figure 9
3. When the fireplace is in the proper position, centered in mantel opening, remove the control
panel door and secure fireplace through holes provided in base to the floor of the mantel
using screws provided. Figure 10
'L'
Brackets
'L' Brackets
Figure 9 Secure Fireplace to Mantel with 'L' Brackets
FP2751
Screws
20301726
Figure 10 Secure Fireplace to Mantel through Base
FP2752
13
CFX Vent Free Fireplace System
GENERAL INSTALLATION INFORMATION
INSTALL OPTIONAL FIREBRICK PANELS
1. Remove optional firebrick panels from packaging. Check to see that you have the following:
• Firebrick panels, 3
• Retainer brackets, 2
• Black screws, 2
If any part or parts are missing, contact dealer where you bought fireplace.
2. Turn off fireplace and allow to cool.
3. Remove fireplace screen (Refer to Page 11, Figure 6) and logs.
4. Place rear firebrick panel on back wall of firebox. Set bottom of panel behind the bracket tabs of the
grate. Figure 11
5.
Place one of the side firebrick panels in cabinet. Line up the hole in the retainer clip with the hole inside
the firebox. Using Phillips screwdriver, attach the retainer bracket to inside of firebox. Figure 12
6. Repeat step five for the other firebrick side panel.
Rear Firebrick
Panel
Bracket Tabs
Figure 11 Install Back Firebrick Panel
Retainer
Clip
Side
Firebrick
Panel
Hole
Screw
Figure 12 Install Side Firebrick Panel
FP2108a
14
20301726
CONNECT THE GAS
CFX Vent Free Fireplace System
CHECK GAS TYPE
Use proper gas type for the fireplace you are installing. If you have conflicting gas type, do not
install fireplace. See dealer where you purchased the fireplace for proper fireplace for your
gas type or conversion kit.
INSTALLING GAS PIPING TO FIREPLACE / BURNER SYSTEM LOCATION
A qualified installer or service person must
connect appliance to gas supply. Follow
all local codes.
WARNING
For propane/LP units, ne v e r connect
fireplace directly to the propane/LP supply.
This burner system requires an external
regulator (not supplied). Install the external
regulator between the burner system and
CAUTION
propane/LP supply.
INSTALLATION ITEMS NEEDED
Before installing fireplace and burner system, make sure you have the items listed below.
• External regulator • Piping (check local codes) • Sealant (resistant to propane/LP gas)
(supplied by installer) • Equipment shutoff valve* • Test gauge connection*
• Sediment trap (recommended) • Tee joint • Pipe wrench
• approved flexible gas line with gas connector (if allowed by local codes — not provided)
* A CSA design-certified equipment shutoff valve with 1/8" NPT tap is an acceptable alternative to test gauge connection. Purchase the CSA design-certified equipment shutoff valve from your dealer.
For propane/LP connections only, the installer must supply an external regulator. The external regulator will reduce
incoming gas pressure. You must reduce incoming gas pressure to between 11 and 13 inches of water. If you do
not reduce incoming gas pressure, burner system regulator damage could occur. Install external regulator with the
vent pointing down as shown in Figure 13. Pointing the vent down protects it from freezing rain or sleet.
20301726
100 gallon (min)
External
Regulator
Figure 13 External Regulator with Vent Pointing Down
(Propane/LP Only)
Propane/LP Supply
Tank
Vent Pointing
Down
FP1977
Use only 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
CAUTION
plate) at the maximum flow rate (BTU/hr).
Undue pressure loss will occur if the pipe
is too small.
When using copper of flex connectors use only fittings
approved for gas connections. The gas control inlet is
3/8" NPT.
15
CFX Vent Free Fireplace System
3" Minimum
CONNECT THE GAS
Only persons licensed to work with gas
piping may make the necessary gas
connections to this appliance.
WARNING
NOTE: The gas line connection may be made using 1/2" rigid tubing or an approved flex connector.
Since some municipalities have additional local codes it is always best to consult your local authorities
and the current edition of the National Fuel Gas Code ANSI.Z223.1, NFPA54. In Canada CSA-B149
(1 or 2) Installation Code.
A listed 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 14
IMPORTANT: Install main gas valve (equipment shutoff valve)
in an accessible location. The main gas valve is for turning on
or shutting off the gas to the fireplace.
Check your building codes for any special requirements for locating equipment shutoff valve to
fireplaces.
Apply pipe joint sealant lightly to male threads. This will prevent excess sealant from going into pipe.
Excess sealant in pipe could result in clogged burner system valves.
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
CAUTION
appliance. Figure 14
Use pipe joint sealant that is resistant to
liquid petroleum (LP) gas.
CAUTION
We recommend that you install a sediment trap/drip leg in supply line as shown in Figure 14. Locate
sediment trap/drip leg where it is within reach for cleaning. Install in piping system between fuel
supply and burner system. Locate sediment trap/drip leg where trapped matter is not likely to freeze.
A sediment trap collects moisture and contaminants and keeps them from going into the burner
system gas controls. If sediment trap/drip leg is not installed or is installed wrong, burner system
may not run properly.
CSA Design-Certified Equipment
Shutoff Valve with 1/8" NPT Tap*
Approved Flexible
Gas Line
Sediment Trap/Drip Leg
(4.5" w.c. to 10.5" w.c. Pressure)
(11" w.c. to 13" w.c. Pressure)
Tee Joint
Pipe Nipple
Natural Gas
From Gas Meter
Propane/LP
From External Regulator
16
Cap
Figure 14 Gas Connection
20301726
CHECK GAS PRESSURE
1. Check gas type. The gas supply must be the same as
stated on the appliance’s rating decal. If the gas supply
is different from the fireplace, STOP! Do not install the
appliance. Contact your dealer immediately.
2. To ease installation, a 24" (610 mm) flex line with
manual shut-off valve has been provided with on this
appliance. Install and attach 1/2" gas line onto shut-off
valve.
3. After completing gas line connection, purge air from
gas line and test all gas joints from the gas meter to
the fireplace for leaks. Use a solution of 50/50 water
and soap solution or a gas sniffer.
4. To adjust flame height, turn HI/LO knob to HI to get
maximum pressure to burner. Turn HI/LO knob to LO
to get minimum pressure.
5. To check gas pressures at valve, turn captured screw
counter clockwise 2 or 3 turns and then place tubing
to pressure gauge over test point. Turn unit to high.
Figure 15 After taking pressure reading, be sure and
turn captured screw clockwise firmly to reseal. Do not
over torque. Check test points for gas leaks.
CFX Vent Free Fireplace System
Pressure
Test “IN”
Pressure
Test “OUT”
HI/LO Knob
Pilot Adjustment Screw
Figure 15 Gas Pressure Check at Gas Valve
FP1979
Do not use open flame to
check for gas leaks.
WARNING
20301726
17
CFX Vent Free Fireplace System
The milli-volt valve is a self-powered combination gas control
that DOES NOT REQUIRE 110V AC TO OPERATE.
Wall
Switch
On/Off
Switch
ELECTRICAL WIRING (MILLI-VOLT)
ODS Pilot
On/Off
Switch
ODS Pilot
Millivolt Valve
Spade Terminal
TH = 3
TP = 1
TP/TH = 2
Figure 16 Wiring Diagram
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
CAUTION
Red
Switch
Red
FP2112
Optional Wall
Switch, Thermostat,
or Remote Receiver
CONNECTING OPTIONAL WALL SWITCH OR THERMOSTAT
1. Use 18 awg, two-wire cable, 20 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. The color of the wires does not matter.
18
20301726
ELECTRICAL WIRING (MILLI-VOLT)
SKYTECH
OFF
ON
REMOTE
FIREPLA
CE
REMOTE
CFX Vent Free Fireplace System
CONNECT REMOTE RECEIVER
THESE INSTRUCTIONS SUPERSEDE THE SECTION ENTITLED “HEARTH MOUNT” IN THE
MILLI-VOLT HAND-HELD REMOTE INSTRUCTIONS SUPPLIED WITH THE REMOTE.
1. Remove bottom louver door.
2. Connect the remote connectors located in the unit.
3. Apply Velcro® pads with self-adhesive backing to bottom of remote receiver and to floor of compartment behind access panel.
4. Attach remote receiver to firebox with Velcro® pads. Control switch must face forward.
Velcro® Pad
Remote Receiver
Figure 17 Install Remote Receiver
Velcro Pad
FP2113
CHECK SYSTEM OPERATION
The millivolt system and individual components may be checked with a millivolt meter having a 0-1000
mV range. Conduct each check shown in chart below by connection meter test leads to terminals as
indicated.
Connect Meter Switch or Meter
Check To Leads to Thermostat Reading Test Test Terminals Contacts Should Be
A Complete 2 & 3 Closed Closed System
B Thermopile 1 & 2 Open Open Output
A. COMPLETE MILLIVOLT SYSTEM CHECK
(“A” Reading - Thermostat contacts CLOSED - Control Knob “ON” - Main burner should be
come ON)
a. If the reading is more than 100 millivolts and the automatic valve still does not come on, replace
the control.
b. If the closed circuit reading (“A” reading) is less than 100 milli-volts, determine cause for low read-
ing, proceed to Section B below.
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, 325 millivolts minimum. If the minimum milli-volt reading is not obtainable,
replace pilot.
Do not place
remote in
combustion
chamber.
NOTICE
20301726
19
CFX Vent Free Fireplace System
Before you begin — This unit is supplied with a set of three ceramic fiber logs. Do not handle these
logs with your bare hands. Always wear gloves to prevent skin irritation from ceramic fibers. After
handling logs, wash your hands gently with soap and water to remove any traces of fibers.
LOG PLACEMENT
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
WARNING
or embellishments such as pine cones,
vermiculite or rock wool to the heater.
DO NOT sprinkle volcanic rock on the logs
or around the pilot or the main burner. This
may cause sooting. Only place volcanic
rock on the floor of the fireplace.
During initial operation of the new heater,
burning logs will give off a paper burning
CAUTION
smell and orange flames will be present.
Simply open the windows for a few hours
to vent the odor.
PROPER INSTALLATION SEQUENCE
(CFX24)
Figure 18
1. Install the rear log (#3) on back of burner.
2. Install the right log (#1) on burner pins on right side of
burner.
3. Install the left log (#2) on burner pins on left side of
burner.
Failure to position the parts in accordance
with these diagrams or failure to use only
parts specifically approved with this heater
may result in property damage or personal
injury.
WARNING
Right Log #1
Left Log
#2
Rear Log
#3
20
Burner Pins
Burner
Pins
Figure 18 Log Placement CFX24
LG588
20301726
LOG & ROCKWOOL PLACEMENT
PROPER INSTALLATION SEQUENCE
(CFX32)
Figure 19
1. Install front right log (#1) on two pins on right
side of burner.
2. Install left front log (#2) on two pins on left side
of burner.
3. Install back log (#3) on back of burner.
4. Install right middle log (#4) on two pins on
burner. Rest right end of right middle log on
the right front log.
5. Install left middle log (#5) on two pins on
burner. Rest left end of left middle log on left
front log.
Pins
Pins
CFX Vent Free Fireplace System
Rear Log
#3
Left Middle
Log #5
Left Front
Log #2
Right Middle Log
#4
Right Front Log #1
Pins
Figure 19 Log Placement CFX32
PLACE ROCK WOOL
After installing logs, pull apart dime-size pieces of rock
wool. Place rock wool evenly over burner ports. Wash
hands after installing rock wool. Itching may occur.
Dime Size Rock
Wool
Pins
LG589
• Use only rock wool provided with log
set.
• Do not add additional rock wool.
• Place rock wool on burner ports only.
• Keep air gap between rear log and burner
CAUTION
CLEAN.
20301726
Figure 20 Rockwool Installation
LG590
21
CFX Vent Free Fireplace System
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 21 for correct
pilot flame.
If the pilot flame does not touch the thermocouple, then
the main burner cannot function reliably. Refer to Figure 22 for incorrect shape of pilot flame.
CORRECT LOG FLAME APPEARANCE
In normal operation at full rate after 15 minutes, the following flame appearances should be observed:
Burner will have a random pattern of yellow flames. Refer to Figures 23 and 24. There should be glowing embers in
front of burner.
NOTE: The front flames and embers will be an opaque
orange color during the burn off time.
FLAME APPEARANCE
Thermocouple
for Natural
Thermocouple
for LP
Figure 21 Correct Appearance of Pilot Flame
Thermocouple
for Natural
Thermocouple
for LP
Figure 22 Incorrect Appearance of Pilot Flame
FP2114
FP2115
Figure 23 Burner Flame Appearance - CFX24
22
LG591
Figure 24 Burner Flame Appearance - CFX32
LG592
20301726
CHECK THE BURNER FLAME
CFX Vent Free Fireplace System
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 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 will be slight and will disappear with continued use.
20301726
23
CFX Vent Free Fireplace System
OPERATING INSTRUCTIONS
FOR YOUR SAFETY READ BEFORE LIGHTING
If you do not follow these instruction
exactly, a fire or explosion may result
causing property damage, personal injury
or loss of life.
WARNING
A. This appliance is equipped with a piezo ignition device which automatically lights the pilot. If
piezo is not working properly refer to Match Lighting Instructions, Page 26.
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.
• 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 in-
structions.
• 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.
24
CFX Controls
HI/LO Control Knob
Control Knob
On/Off Switch
Piezo Ignition
FP2750
20301726
OPERATING INSTRUCTIONS
CFX Vent Free Fireplace System
MILLI-VOLT 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 the instructions for Match Lighting Instructions, Page 26.
4. Turn gas control knob clockwise to the OFF position, set the thermostat to the lowest setting 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 "B" in the safety information label. If you don't smell gas, go to next step.
6. From OFF position, turn the gas control knob counterclockwise to IGN position. Push in control
knob for 5 seconds.
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 or adjust thermostat to desired setting.
11. If the gas logs will not operate, follow the instructions To Turn Off Gas To Appliance below and call
your service technician or gas supplier.
Wait 30 seconds before readjusting the
heater when the control knob has been
turned down to a lower setting.
WARNING
Pilot
Control Knobs
Piezo
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.
20301726
25
CFX Vent Free Fireplace System
OPERATING INSTRUCTIONS
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.
CLEANING AND SERVICING
Annual inspection and cleaning by your dealer or qualified service technician is recommended
to prevent malfunction and/or sooting.
Turn off heater and allow to cool before
cleaning. Disconnect electrical power before
cleaning or servicing.
WARNING
Remove fireplace screen. Carefully lower screen from mounting lugs and set aside during cleaning. See instruction manual for installation of screen. DO NOT OPERATE THE UNIT WITH THE
SCREEN REMOVED.
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. See
manual for correct log placement.
PERIODIC CLEANING - See 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. Remove lint or particles with vacuum, brush or pipe cleaners.
• External case should be dusted and wiped with a wet soapy cloth.
ANNUAL CLEANING/INSPECTION - Refer to the parts diagram for location of items discussed
below.
• 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 burner.
26
20301726
BLOWER and OTHER OPTIONAL EQUIPMENT
CFX Vent Free Fireplace System
OPTIONAL EQUIPMENT
FORCED AIR KIT
If you are installing the forced air kit (Models BLO24-T or BLOT), see the installation instructions
provided with the kit for electrical wiring requirements or the blower installation section.
Model CFX24 uses blower model BLO24T.
Model CFX32 uses blower model BLOT.
The firebox must be connected to main power supply at time of firebox installation. The blower must
be installed prior to the installation of the unvented heater. The electrical connections must be made
before the firebox is framed and enclosed in the finished walls.
FIREBRICKS
Optional firebrick kits can be installed. Refer to installation instructions provided with kit or Page
14.
Electrical connections should only be
performed by a qualified, licensed electrician,
main power must be off when connecting to
main electrical power supply or performing
CAUTION
service.
CAUTION
20301726
27
CFX Vent Free Fireplace System
TROUBLESHOOTING
Turn appliance OFF and allow to cool before
servicing. Only a qualified service person
Note: All troubleshooting items are listed in order
of operation.
should service and repair the heater.
WARNING
OBSERVED PROBLEM POSSIBLE CAUSEREMEDY
When ignitor button is
pressed, there is no 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.
5. Restrictions in incoming air flow.5. Check for bottom riser on glass door,
1. Gas leak.1. Locate and correct all leaks.
2. Control valve defective.2. Replace control valve.
1. Gas supply turned off or manual shutoff
valve closed.
2. Control knob not in PILOT position.2. Turn control knob to PILOT position.
3. Control knob not pressed in while in
PILOT position.
4. Air in gas lines when installed.4. Continue holding down control knob.
5. ODS/pilot is clogged.5. Replace ODS/pilot assembly or get it
6. Gas regulator setting is not correct.6. Check incoming pressure. Replace gas
3. Reconnect ignitor cable.
4. Free ignitor cable if pinched by any metal
or tubing.
1. Ventilate room. Stop using odor causing
products while heater is running.
odor is gone. Odor should be gone after 2
to 3 hours of continuous use.
1. Open window and/or door for ventilation.
should be 500 milli-volts across TH/TP
and TP Terminals with ON/OFF switches
off.
sunken fireplace, excessive lava rock/
cinders densely packed against grate.
1. Turn on gas supply or open manual shutoff
valve.
3. Press in control knob while in PILOT
position.
Repeat igniting operation until air is
removed.
serviced.
regulator.
28
20301726
TROUBLESHOOTING
CFX Vent Free Fireplace System
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
WARNING
gas supplier immediately.
OBSERVED PROBLEM POSSIBLE CAUSEREMEDY
ODS/pilot lights, but flame
goes out when control knob
is released.
Burner does not light after
ODS/pilot is lit.
Bu rner backfi res 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.1. LP-regulator shut down due to inlet
1. Control knob not fully pressed in.1. Press in control knob fully.
2. Control knob not pressed in long
enough.
3. Manual shutoff valve not fully open.3. Fully open manual shutoff valve.
4. Thermocouple connection loose at
control valve.
5. Pilot flame not touching thermocouple,
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.6. Replace thermocouple.
7. Control valve damaged.7. Replace control valve.
1. Burner orifice is clogged.1. Burner orifice is clogged.
2. Burner orifice diameter is too small.2. Burner orifice diameter is too small.
3. Inlet gas pressure is too low.3. Inlet gas pressure is too low.
1. Manifold pressure is too low.1. Contact local gas company.
2. Burner orifice is clogged.2. Clean burner or replace burner orifice.
1. Burner orifice is clogged or damaged.1. Clean burner or replace burner orifice.
2. Burner is damaged.2. Replace burner.
3. Gas regulator defective.3. Replace gas regulator.
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.2. Operate burner until air is removed from
3. Dirty or partially clogged burner orifices.3. Clean burner or replace burner orifice.
pressure too high.
2. After ODS/pilot lights, keep control knob
pressed in for 30 seconds.
4. Hand tighten thermocouple connection
until snug, then tighten 1/4 turn more.
5. Contact local gas company.
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.
line. Have gas line checked by local gas
company.
1. Verify LP tank regulator is installed and
set at 11" to 13" w.c.
2. Replace regulator on heater.
20301726
29
CFX Vent Free Fireplace System
1
2
REPLACEMENT PARTS
Item Description Qty. CFX24 CFX32
1. Assy Door, Painted 1 88D0032K 88D0107K
2. Assy Screen Frame, Painted 1 88D0034K 88D0109K
30
20301726
REPLACEMENT PARTS
1
3
2
10
8
7
11
14
13
12
5
6
9
4
13
12
14
15
16
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
CFX Vent Free Fireplace System
20301726
31
CFX Vent Free Fireplace System
REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER.
11. ODS Pilot Assembly 1 14D0473 14D0477 14D0473 14D0477
Log Set
12. #1 Left Log 1 33D4040 33D4040 33D5042 33D5042
13. #2 Right Log 1 33D4041 33D4041 33D5043 33D5043
14. #3 Rear Log 1 33D4039 33D4039 33D5044 33D5044
15. #4 Right Middle Log 1 --- -- 33D5045 33D5045
16. #5 Left Middle Log 1 -- -- 33D5046 33D5046
Parts Available, Not Shown
Tube Nut, 5/16 1 00K0917 00K0917 00K0917 00K0917
Tube Ferrule, 5/16 1 00K0918 00K0918 00K0918 00K0918
Flex Tube w/Fittings 1 20H0022 20H0022 20H0022 20H0022
Rock Wool Bag 1 58D0443 58D0443 70D0129 70D0129
REPLACMENT PARTS
32
20301726
CFX Vent Free Fireplace System
20301726
33
CFX Vent Free Fireplace System
34
20301726
LIMITED LIFETIME WARRANTY POLICY
CFX Vent Free Fireplace System
LIFETIME WARRANTY
The following components are warranted for life to the original owner, subject to proof of purchase: Firebox, Combustion Chamber, Heat Exchanger, Grate and Stainless Steel Burners.
FIVE YEAR WARRANTY
The following components are warranted five (5) years to the original owner, subject of proof
of purchase: Ceramic Fiber Logs, Catalytic Filter and Aluminzed 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 one year 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 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 in 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, alterations, 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 liabilities in connection with sale or use of the
appliance. It 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 the Limited Lifetime Warranty.
MHSC reserves the right to investigate any and all the 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.
20301726
35
MHSC
149 Cleveland Drive • Paris, Kentucky 40361
www.mhsc.com
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