Vermont Castings CFX24NV User manual

This is an unvented gas-fired heater. It uses air
(oxygen) from the room in which it is installed.
Provisions for adequate combustion and
ventilationairmustbeprovided.RefertoPage7.
20301726 9/14 Rev. 6
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
CFX Series Vent Free Gas Fireplace
Installation and Operating Instructions
Models: CFX24, CFX32 Millivolt Control, Natural Gas
or Liquid Propane
WARNING: FIRE OR EXPLOSION HAZARD
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.

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CFX VENT FREE FIREPLACE SYSTEM
20301726
CONTENTS
Important Safety Information .................................3–4
Product Features and Specifications....................5–6
Operation................................................................5
Gas Pressures........................................................5
Gas Specifications..................................................5
Ignition Controls......................................................5
Pilot.........................................................................5
Thermal Generator..................................................5
Fireplace & Mantel Dimensions .................................6
Getting Started.............................................................7
Unpacking...............................................................7
Installation Information............................................7
Fireplace Location and Clearances...........................8
Determining Fireplace Location..............................8
Clearances and Height Requirements ...................8
Fireplace Installation.............................................9–12
Fireplace Installation in Wall ...................................9
Mantel Installation.................................................10
Firebox to Mantel Installation................................10
Removing Screen ................................................. 11
Optional Firebrick Panels......................................12
Gas Connection ..................................................13–15
Check Gas Type ...................................................13
Install Gas Pipe to Fireplace/Burner.....................13
Connect the Gas...................................................14
Check Gas Pressure.............................................15
Electrical Connections........................................16–17
Electrical Wiring....................................................16
Connecting Optional Wall Switch or Thermostat...16
Connecting Remote Receiver...............................17
Check System Operation......................................17
Final Steps ..........................................................18–20
Proper Installation Sequence (CFX24).................18
Proper Installation Sequence (CFX32).................18
Place Rock Wool...................................................19
Check Pilot Flame ................................................19
Correct Log Flame Appearance ...........................19
Optional Equipment ..............................................20
Operating Instructions .......................................20–23
Operating Instructions...........................................20
For Your Safety Read Before Lighting ..................21
Millivolt Control Lighting Instructions ....................22
To Turn Off Gas to Heater.....................................22
Match Lighting Instructions ..................................23
Cleaning and Servicing.........................................23
Troubleshooting ..................................................24–25
Replacement Parts .............................................26–28
Warranty ....................................................................29
Thank you for purchasing a Vermont Castings Group product. We are proud to manufacture all of
our gas and wood burning appliances in the USA. We hope that you enjoy your new fireplace and
have many happy memories around it for years to come.

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CFX VENT FREE FIREPLACE SYSTEM
20301726
12. Avoidany draftsthatalter burnerflamepatterns. Donot
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 re-burnt in the vent-free
appliancewhichcan produceodors.It isrecommended
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
theroomin whichit isinstalled.Provisions foradequate
combustion and ventilation air must be provided. See
installation guidelines.
15. This heater shall not be installed in a room or space
unlessthe required volume ofindoor combustion airis
providedby the method describedin the NationalFuel
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 flammable vapors and
liquids.
17. Unventedgas heatersarea supplementalzone heater.
They are not intended to be a primary heating appli-
ance.
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. Duringmanufacturing,fabricating andshipping,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
IMPORTANT
Read these instructions carefully before installing or trying to operate this vent-free gas heater.
IMPORTANT SAFETY INFORMATION
8. CARBON MONOXIDE POISONING: Early signs of
carbon monoxide poisoning are similar to the flu with
headaches,dizzinessand/or nausea.If youhavethese
signs, obtain fresh air immediately. Have the heater
serviced as it may not be operating properly.
9. This unit complies withANSI Z21.11.2 unvented heat-
ers standard, latest edition.
10. Do not install the CFX Model in a bathroom or bed-
room.
11. Correct installation of the ceramic fiber logs, proper
location of the heater, and annual cleaning are neces-
saryto avoid potentialproblems with sooting. Sooting,
resulting from improper installation or operation, can
settleon surfaces outsidethe fireplace. Seelog place-
ment instructions for proper installation.
1. Due to high temperatures, the appliance 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. Youngchildren should becarefully supervised when
they are in the same room with the appliance.
4. Donot place clothingor otherflammable material on
or near the appliance.
5. Anysafety screen orguard removedfor 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.
•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.
•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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CFX VENT FREE FIREPLACE SYSTEM
20301726
IMPORTANT SAFETY INFORMATION
asthey are burnedoffduring the initialoperation ofthe
appliance;possibly causing headaches,or eyeor 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
allowodors todissipate.Any odors remainingafter 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
elevationsup to2,000 feet.For elevationsabove2,000
feet,input ratingsshouldbe reduced4 percentforeach
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
duringany pressure testingof that systemat test pres-
sures in excess of 1/2 psig (3.5 kPa).
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. Donot use thisroom heater ifany part hasbeen under
water. Immediately call a qualified service technician
to inspect the room heater and to replace any part of
thecontrol systemand anygas controlwhich hasbeen
under water.
24. Never burn solid fuels in a fireplace where a unvented
room heater is installed.
25. 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.
26. 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 com-
bustible materials.
Thisappliancemaybeinstalledinanaftermarket,
permanently located, manufactured (mobile)
home, where not prohibited by local codes.
This appliance is only for use with the type of
gas indicatedon the ratingplate. This appliance
is not convertible for use with other gases.
CODES
Adhere to all local codes or, in their absence, the latest
editionofTHENATIONALFUELGAS CODEANSIZ223.1
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

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CFX VENT FREE FIREPLACE SYSTEM
20301726
PRODUCT FEATURES & SPECIFICATIONS
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.
Figure 1 -
Control Access Door Shown Open
GAS PRESSURES
Control Fuel Millivolt
Regulator Pressure Natural Gas 3.5" w.c.
Pilot Regulator Natural Gas 3.5" w.c.
Max. Inlet Pressure Natural Gas 10.5" w.c.
Min. Inlet Pressure Natural Gas 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
ThePiezo igniter allowsignitionof the pilotwithout the use
of matches or batteries.
The millivolt control has four (4) positions:
OFF - Allgas to the gaslogs is shut offat the
valve.
IGN - Valveposition tolight/maintaina stand-
ing pilot.
ON - Valve position to turn ON/OFF log set
with remote switch/thermostat.
LOW/HI - Variablepositiontocontrolflameheight
(heatoutput). Bothfrontand rearburn-
ersare in operationto providerealistic
glow and yellow flame.
PILOT
Thegas log heateris fittedwith a speciallydesigned safety
pilot light which senses the amount of oxygen available in
theroom andshuts thegaslog heateroffif theoxygen level
beginsto dropbelow a satisfactorylevel.The pilotcan only
be re-lit when adequate fresh air is available.
THERMAL GENERATOR
The millivolt gas log pilot is fitted with a millivolt generator
to provide power for remote activation.
Piezo Igniter
Control Knob On/Off Switch
HI/LO Control Knob