MHSC CFX24 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 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.
• 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 qualied 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.
20301726 7/11 Rev. 4
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future refer-
ence.
1726
CFX cover

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20301726
CONTENTS
Important Safety Information ..................................... 3
Product Features and Specications ........................ 5
Gas Pressures ........................................................ 5
Gas Specications .................................................. 5
Ignition Controls ...................................................... 5
Pilot ......................................................................... 5
Thermal Generator .................................................. 5
Fireplace & System Dimensions ............................. 6
Getting Started ............................................................. 7
Fireplace Installation ................................................... 8
Location of Fireplace ............................................... 8
Clearances and Height Requirements ................... 9
Remove Screen .................................................... 10
Install Mantel ......................................................... 11
Firebox to Mantel Installation ................................ 12
Install Optional Firebrick Panels ........................... 13
Connecting the Gas .................................................. 14
Check Gas Type ................................................... 14
Install Gas Piping to Fireplace/Burner .................. 14
Connect the Gas ................................................... 15
Check Gas Pressure ............................................. 16
Electrical Wiring (Millivolt) ........................................ 17
Connect Optional Wall Switch or Thermostat ....... 17
Connect Remote Receiver .................................... 18
Check System Operation ...................................... 18
Log Placement .......................................................... 19
Flame Appearance ............................................... 21
Place Rock Wool ................................................... 20
Check Pilot and Burner Flame Appearance .......... 21
Operating Instructions ............................................. 22
For Your Safety Read Before Lighting .................. 23
Millivolt Control Lighting Instructions .................... 24
Match Lighting Instructions .................................. 25
Cleaning and Servicing ............................................ 25
Blower and Optional Equipment .............................. 26
Troubleshooting ........................................................ 27
Replacement Parts
Face Parts ............................................................. 29
Burner Parts .......................................................... 30
Optional Accessories ................................................ 31
Warranty .................................................................... 32
CFX Series gas log appliances described in this manual feature the
TRIPLE PLAY BURNER SYSTEM® with exclusive triple effect technology
producing a full random yellow ame, full depth ember bed and glowing logs.

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CFX Vent Free Fireplace System
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11. Correct installation of the ceramic ber logs, proper
location of the heater, and annual cleaning are neces-
sary to avoid potential problems with sooting. Sooting,
resulting from improper installation or operation, can
settle on surfaces outside the replace. See log place-
ment instructions for proper installation.
12. 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.
13. CAUTION: Candles, incense, oil lamps, etc. produce
combustion by-products including soot. Vent-free
appliances will not lter or clean soot produced by
these types of products. In addition, the smoke and/or
aromatics (scents) may be reburnt in the vent-free
appliance which can produce odors. It is recommended
to minimize the use of candles, incense, etc. while the
vent-free appliance is in operation.
14. An unvented gas-red 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. 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.
16. Keep room area clear and free from combustible
materials, gasoline and other ammable vapors and
liquids.
17. Unvented gas heaters are a supplemental zone heater.
They are not intended to be a primary heating appli-
ance.
IMPORTANT
Read these instructions carefully before installing or trying to operate a vent-free gas heater in this rebox.
IMPORTANT SAFETY INFORMATION
8. 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.
9. This unit complies with ANSI Z21.11.2 unvented heat-
ers standard, latest edition.
10. Do not install the CFX Model in a bathroom or bed-
room.
INSTALLER
Please leave these instructions with the appliance.
OWNER
Please retain these instructions for future reference .
1. Due to high temperatures, the appliance be
located out of trafc 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 qualied
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.
• 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.
WARNING

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IMPORTANT SAFETY INFORMATION
18. Unvented gas heaters emit moisture into the living
area. In most homes of average construction, this
does not pose a problem. In houses of extremely
tight construction, additional mechanical ventilation is
recommended.
19. During manufacturing, fabricating and shipping, various
components of this appliance are treated with certain
oils, lms or bonding agents. These chemicals are not
harmful but may produce annoying smoke and smells
as they are burned off during the initial operation of the
appliance; possibly causing headaches, or eye or lung
irritation. This is a normal and temporary occurrence.
The initial break-in operation should last 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.
20. Input ratings are shown in BTU per hour and are for
elevations up to 2,000 feet. For elevations above 2,000
feet, input ratings should be reduced 4 percent for each
1,000 feet above sea level. Refer to the National Fuel
Gas Code.
21. The appliance and its appliance main gas valve must
be disconnected from the gas supply piping system
during any pressure testing of that system at test pres-
sures in excess of 1/2 psig (3.5 kPa).
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
22. The appliance must be isolated from the gas supply
piping system by closing its equipment shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psig
(3.5 kPa).
23. Do not use this room heater if any part has been under
water. Immediately call a qualied service technician
to inspect the room heater and to replace any part of
the control system and any gas control which has been
under water.
24. Never burn solid fuels in a replace where a unvented
room heater is installed.
25. Always have a replace 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.
26. Do not ll spaces around the rebox with insulation or
other materials. These spaces must be maintained to
prevent the rebox from coming in contact with com-
bustible materials.

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PRODUCT FEATURES & SPECIFICATIONS
OPERATION
This unvented gas heater requires no outside venting and
burns cleanly with high heating efciency.
This zero-clearance unvented gas heater can be installed
against any wall that is accessible to a gas line.
FP2750
CFX controls
Piezo Ignition
Control Knob
Figure 1 -
Unvented Gas Heater
(Control Access Door Shown Open)
On/Off Switch
HI/LO Control Knob
FP2750
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.
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
GAS SPECIFICATIONS
NOTE: For LP models an external regulator is required
to reduce supply pressure to a maximum of 13" w.c.
IGNITION CONTROLS
Piezo ignitor allows ignition of the pilot without the use of
matches or batteries.
Millivolt control has four (4) positions:
OFF - All gas to the gas logs is shut off at the
valve.
IGN - Valve position to light/maintain a stand-
ing pilot.
ON - Valve position to turn ON/OFF log set
with remote switch/thermostat.
LOW/HI - Variable position to control ame height
(heat output). Both front and rear burn-
ers are in operation to provide realistic
glow and yellow ame.
PILOT
The gas log heater is tted 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 millivolt gas log pilot is tted with a millivolt generator
to provide power for remote activation.

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FIREPLACE & SYSTEM DIMENSIONS
Figure 2 -
Firebox Dimensions
E
D
C
ABF
G
H
I
1726
CFX Barrington dims
H
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)

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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 ber 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
GETTING STARTED
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 pro-
ceeding 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
• Gloves are recommended when handling
ceramic ber logs to prevent skin irritation
from loose fibers. Logs are fragile —
handle with care.
CAUTION
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, how-
ever, and might require a different sequence.
1. Determine desired location for replace. 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 replace 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 experi-
enced, licensed certied 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/certied tradesman).
WARNING
Do not install the heater:
• Where curtains, furniture, clothing, or
other ammable objects are less than
42" from the front of the heater.
• In high trafc areas.
• In windy or drafty areas.
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
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FP2110a
fireplace locations
12/08
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 Clearances
and Height Requirements section on Page 9. 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 trafc areas and away from furniture and draperies due to heat from
rebox.
• Never obstruct the front opening of the unvented replace or restrict the ow of combustion and
ventilation air.
• 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 3 -
Suggested Locations
FP2110a
FIREPLACE INSTALLATION

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9”
Min.
9”
Min.
42”
Min.
FP2111a
min clearances
CLEARANCES and HEIGHT REQUIREMENTS
Ensure that minimum clearances shown in Figure 4 are maintained. Left and right clearances are deter-
mined 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.
1. Sidewall Clearances — The clearance from the inside of the appliance to any combustible adjacent
wall should not be less than 9". Figure 4
2. Ceiling Clearance — The ceiling must be at least 42" from the top of the rebox opening. Figure 4
3. Back Wall Clearance — The appliance may be placed against a combustible back wall.
Figure 4 -
Clearances and Height Requirements
FP2111a
WARNING
The dimensions shown in Figure 4 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
to follow instructions exactly can create a re hazard.

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FP2109a
remove screen
REMOVE SCREEN
Figure 5
1. Remove bottom access door.
2. Remove replace screen frame panel by pushing screen frame panel up and out.
GENERAL INSTALLATION INFORMATION
Figure 5 -
Remove Fireplace Screen Frame Panel
NOTE: Fireplace screen must be removed to access log box.
FP2109a
WARNING
Do not operate the unit without the screen
frame panel installed.

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INSTALL MANTEL
1. Place base near nal 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
ush 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
replace into the mantel in or-
der to locate the trim pieces.
7. Center the replace in the
opening with the inside of the
replace 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 replace. Secure with two
(2) screws; one on each end
of the trim piece in the pre-
drilled holes.
9. Place the vertical trim pieces
so the edge is about 1/4” from
the replace body. Make sure
the joint between the trim
pieces is satisfactory. Secure
through joining block #3 into
horizontal trim using two (2)
screws. Attach joining block #2 to the bottom of the vertical trim. Repeat for other side.
10. Remove replace and move mantel to its nal position. Cut wall base moulding as necessary
to provide adequate t 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.
KT1233
wall bracket
Figure 7 -
Wall Bracket
Joining Block #4
KT1220
assemble surround
Top Joining
Block #4
Right
Side
Joining
Block #3
Header
Joining
Block #3
Left Side
Joining
Block #2
Joining
Block #2
Joining
Block #1
Base
Joining
Block #1
Vertical
Trim
Vertical Trim
Horizontal Trim
KT1220
Figure 6 -
Barrington Mantel

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FIREPLACE INSTALLATION
FIREBOX TO MANTEL INSTALLATION
1. Slide replace into mantel.
2. Use the two (2) 'L' brackets provided to secure the replace to the mantel. Figure 8
3. When the replace is in the proper position, centered in mantel opening, remove the control
panel door and secure replace through holes provided in base to the oor of the mantel
using screws provided. Figure 9
FP2751
Mantel L brackets
'L'
Brackets
'L' Brackets
FP2751
Figure 8 -
Secure Fireplace to Mantel with 'L' Brackets
FP2752
Secure fireplace to mantel
Screws
FP2752
Figure 9 -
Secure Fireplace to Mantel through Base

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FP2108a
install firebrick
GENERAL INSTALLATION INFORMATION
INSTALL OPTIONAL FIREBRICK PANELS
1. Remove optional rebrick 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 replace.
2. Turn off replace and allow to cool.
3. Remove replace screen (Refer to Page 10, Figure 5) and logs.
4. Place rear rebrick panel on back wall of rebox. Set bottom of panel behind the bracket tabs of the
grate. Figure 10
5. Place one of the side rebrick panels in cabinet. Line up the hole in the retainer clip with the hole inside
the rebox. Using Phillips screwdriver, attach the retainer bracket to inside of rebox. Figure 11
6. Repeat step ve for the other rebrick side panel.
Figure 10 -
Install Back Firebrick Panel Figure 11 -
Install Side Firebrick Panel
Bracket Tabs
Rear Firebrick
Panel
Retainer
Clip
Side
Firebrick
Panel
Screw
Hole
FP2108a

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20301726
CONNECT THE GAS
FP1977
external regulator
Figure 12 -
External Regulator with Vent Pointing Down
(Propane/LP Only)
CHECK GAS TYPE
Use proper gas type for the replace you are installing. If you have conicting gas type, do not
install replace. See dealer where you purchased the replace for proper replace for your
gas type or conversion kit.
INSTALLING GAS PIPING TO FIREPLACE / BURNER SYSTEM LOCATION
INSTALLATION ITEMS NEEDED
Before installing replace 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 exible gas line with gas connector (if allowed by local codes — not provided)
* A CSA design-certied equipment shutoff valve with 1/8" NPT tap is an acceptable alternative to test gauge con-
nection. Purchase the CSA design-certied 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 12. Pointing the vent down protects it from freezing rain or sleet.
External
Regulator
100 gallon (min)
Propane/LP Supply
Tank
Vent Pointing
Down
When using copper of ex connectors use only ttings
approved for gas connections. The gas control inlet is
3/8" NPT.
WARNING
A qualied installer or service person must
connect appliance to gas supply. Follow
all local codes.
CAUTION
For propane/LP units, never connect
replace directly to the propane/LP supply.
This burner system requires an external
regulator (not supplied). Install the external
regulator between the burner system and
propane/LP supply.
FP1977
CAUTION
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 sulde
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.

15
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20301726
CONNECT THE GAS
3" Minimum
FP1978
gas connection
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 13
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 replace.
Check your building codes for any special requirements for locating equipment shutoff valve to
replaces.
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.
We recommend that you install a sediment trap/drip leg in supply line as shown in Figure 13. 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.
Figure 13 -
Gas Connection
Cap
Approved Flexible
Gas Line
CSA Design-Certied Equipment
Shutoff Valve with 1/8" NPT Tap*
Sediment Trap/Drip Leg
Natural Gas
From Gas Meter
(4.5" w.c. to 10.5" w.c. Pressure)
Propane/LP
From External Regulator
(11" w.c. to 13" w.c. Pressure)
NOTE: The gas line connection may be made using 1/2" rigid tubing or an approved ex 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.
Tee Joint
Pipe Nipple
WARNING
Only persons licensed to work with gas
piping may make the necessary gas
connections to this appliance.
CAUTION
A manual shutoff valve must be installed
upstream of the appliance. Union tee
and plugged 1/8” NPT pressure tapping
point should be installed upstream of the
appliance. Figure 13
CAUTION
Use pipe joint sealant that is resistant to
liquid petroleum (LP) gas.

16
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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 replace, STOP! Do not install the
appliance. Contact your dealer immediately.
2. To ease installation, a 24" (610 mm) ex 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 replace for leaks. Use a solution of 50/50 water
and soap solution or a gas sniffer.
4. To adjust ame 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 14 After taking pressure reading, be sure and
turn captured screw clockwise rmly to reseal. Do not
over torque. Check test points for gas leaks.
FP1979
Millivolt gas valve
FP1979
Figure 14 -
Gas Pressure Check at Gas Valve
Pressure
Test “IN”
Pressure
Test “OUT”
HI/LO Knob
Pilot Adjustment Screw
WARNING
Do not use open ame to
check for gas leaks.

17
CFX Vent Free Fireplace System
20301726
ELECTRICAL WIRING - MILLIVOLT
The millivolt valve is a self-powered combination gas control
that DOES NOT REQUIRE 110V AC TO OPERATE.
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.
FP2112
wiring diagram
12/08
Switch
On/Off
Switch
On/Off
Switch
Field Installed
Wall Switch
or Remote
Receiver
ODS Pilot
Millivolt Valve
TP/TH = 2
Figure 15 -
Wiring Diagram
ODS Pilot
Spade Terminal
TH = 3
TP = 1
FP2112
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
CAUTION

18
CFX Vent Free Fireplace System
20301726
ELECTRICAL WIRING - MILLIVOLT
CONNECT REMOTE RECEIVER
THESE INSTRUCTIONS SUPERSEDE THE SECTION ENTITLED “HEARTH MOUNT” IN
THE MILLIvOLT 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 oor of compart-
ment behind access panel.
4. Attach remote receiver to rebox with Velcro® pads. Control switch must face forward.
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.
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 millivolts, 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 millivolt reading is not obtainable,
replace pilot.
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
SKYTECH
OFF ON
REMOTE
FIREPLACE
REMOTE
FP2113
install remote
Remote Receiver
Velcro Pad
Velcro® Pad
Figure 16 -
Install Remote Receiver FP2113
NOTICE
Do not place
remote in
combustion
chamber.

19
CFX Vent Free Fireplace System
20301726
LOG PLACEMENT
Before you begin — This unit is supplied with a set of three ceramic ber logs. Do not handle these
logs with your bare hands. Always wear gloves to prevent skin irritation from ceramic bers. After
handling logs, wash your hands gently with soap and water to remove any traces of bers.
PROPER INSTALLATION SEQUENCE
(CFX24)
Figure 17
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.
LG588
CFX24 logs
Figure 17 -
Log Placement CFX24
Rear Log
#3
Left Log
#2
Right Log #1
Burner Pins
Burner
Pins
LG588
WARNING
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 rmly positioned
in the appliance. Never add additional logs
or embellishments such as pine cones,
vermiculite or rock wool to the heater.
WARNING
Failure to position the parts in accordance
with these diagrams or failure to use only
parts specically approved with this heater
may result in property damage or personal
injury.
CAUTION
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 oor of the replace.
During initial operation of the new heater,
burning logs will give off a paper burning
smell and orange ames will be present.
Simply open the windows for a few hours
to vent the odor.

20
CFX Vent Free Fireplace System
20301726
LOG & ROCKWOOL PLACEMENT
PROPER INSTALLATION SEQUENCE
(CFX32)
Figure 18
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.
LG589
CFX32 logs
Figure 18 -
Log Placement CFX32
Pins
Left Front
Log #2
Left Middle
Log #5
Right Front Log #1
Right Middle Log
#4
Rear Log
#3
Pins
Pins
Pins
LG589
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.
• 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
CLEAN.
CAUTION
LG590
CFX rock wool
Figure 19 -
Rockwool Installation
Dime Size Rock
Wool
LG590