Vent-free Fireplace Systems Models: CFX24, CFX32 Natural Gas or LP, Millivolt Installation and Operating Instructions WARNINGS If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life. – Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. – WHAT TO DO IF YOU SMELL GAS • Do not try to light any appliance.
CFX Vent Free Fireplace System CONTENTS 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 flame, full depth ember bed and glowing logs. Important Safety Information...................................... 3 Log Placement ........................................................ 20 Product Features........................................................ 5 Flame Appearance .....................
CFX Vent Free Fireplace System IMPORTANT SAFETY INFORMATION INSTALLER OWNER Please leave these instructions with the appliance. Please retain these instructions for future reference. IMPORTANT warning 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.
CFX Vent Free Fireplace System 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. 18. During manufacturing, fabricating and shipping, various components of this appliance are treated with certain oils, films or bonding agents.
CFX Vent Free Fireplace System PRODUCT FEATURES Fireplace Screen HI/LO Control Knob Control Knob Piezo Ignition On/Off Switch Figure 1 - Unvented Gas Heater (Control Access Door Shown Open) operation FP2106 FP2106 CFX control parts 12/08 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.
CFX Vent Free Fireplace System PRODUCT FEATURES and SPECIFICATIONS PRESSURES and BTU's Natural Gas Propane/LP* Regulator Pressure Setting 3.5" w.c. Regulator Pressure Setting 10" w.c. Pilot Regulator 3.5" w.c. Gas Inlet Pressure Max. 13" w.c. Gas Inlet Pressure Max. 10.5' w.c. Miin. 11" w.c. Min. 5" w.c. NOTE: For LP, an external regulator is required to reduce supply pressure to a maximum of 13" w.c. Model CFX24 CFX32 (Millivolt) Natural Propane Natural Propane Max.
PRODUCT SPECIFICATIONS and GETTING STARTED CFX Vent Free Fireplace System 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.
CFX Vent Free Fireplace System GENERAL INSTALLATION INFORMATION 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. Position fireplace in desired location.
GENERAL INSTALLATION INFORMATION CFX Vent Free Fireplace System 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… warning American National Standards Institute, Inc. 1430 Broadway New York, NY 10018 or National Fire Protection Association, Inc.
CFX Vent Free Fireplace System GENERAL INSTALLATION INFORMATION H L2 L1 W Figure 3 - Sample Room for Determining the Maximum Heater Rating The following formula can be used to determine the maximum heater rating per the definition of unconfined fp2107 space: max heat rating BTU /Hr = 12/08 / (L1 + L2) Ft x (W) Ft x (H) Ft. BTU Hr x 1000 50 Consider two connecting rooms with an open area between, with the following dimensions: L1 = 151/2 Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
CFX Vent Free Fireplace System GENERAL INSTALLATION INFORMATION installing optional FIREbrick panels 1. Remove optional firebrick panels from packaging. Check to See that you have the following: • 3 firebrick panels • two (2) retainer brackets • two (2) black screws 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 12, Figure 6) and logs. 4.
CFX Vent Free Fireplace System GENERAL INSTALLATION INFORMATION REMOVING SCREEN Figure 6 1. Remove bottom access door. warning 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. FP2109 Figure 6 - Remove Fireplace Screen Frame Panel NOTE: Fireplace screen must be removed to access log box.
CFX Vent Free Fireplace System LOCATION OF FIREPLACE Carefully select the best location for installation of your unvented fireplace. 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 14. Minimum clearances to combustibles must be maintained.
CFX Vent Free Fireplace System CLEARANCES and HEIGHT REQUIREMENTS Ensure that minimum clearances shown in Figure 8 are maintained. Left and right clearances are determined 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 8 2.
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. caution WARNING Installing gas piping to fireplace / burner system location A qualified installer or service person must connect appliance to gas supply. Follow all local codes.
CONNECT THE GAS Only persons licensed to work with gas piping may make the necessary gas connections to this appliance. 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. caution warning CFX Vent Free Fireplace System NOTE : The gas line connection may be made using 1/2" rigid tubing or an approved flex connector.
CFX Vent Free Fireplace System 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.
CFX Vent Free Fireplace System ELECTRICAL WIRING (Milli-volt) The milli-volt valve is a self-powered combination gas control that does not require 110V ac to operate. ODS Pilot On/Off Switch ODS Pilot Wall Switch Millivolt Valve On/Off Switch Spade Terminal TH = 3 Red TP = 1 TP/TH = 2 Red CAUTION Figure 12 - Wiring Diagram FP2112 Switch Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous o p e r a t i o n .
CFX Vent Free Fireplace System ELECTRICAL WIRING (Milli-volt) 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. notice 4. Attach remote receiver to firebox with Velcro® pads.
CFX Vent Free Fireplace System 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 or embellishments such as pine cones, vermiculite or rock wool to the heater. caution warning WARNING Before you begin — This unit is supplied with a set of three ceramic fiber logs. Do not handle these logs with your bare hands.
CFX Vent Free Fireplace System LOG PLACEMENT Proper installation sequence (CFX32) Figure 15 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.
FLAME APPEARANCE 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 16 for correct pilot flame.
install rock wool and check burner flame CFX Vent Free Fireplace System Place rock wool CAUTION 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.
CFX Vent Free Fireplace System CHECK THE BURNER FLAME 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.
CFX Vent Free Fireplace System OPERATING INSTRUCTIONS warning 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. A. This appliance is equipped with a piezo ignition device which automatically lights the pilot. If piezo is not working properly see Match Lighting Instructions, Page 27. B. BEFORE OPERATING smell all around the appliance area for gas.
OPERATING INSTRUCTIONS CFX Vent Free Fireplace System warning 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, See instructions for Match Lighting Instructions, Page 27. 4.
OPERATING INSTRUCTIONS 1. 2. 3. 4. CFX Vent Free Fireplace System MATCH LIGHTING INSTRUCTIONS Remove any items necessary for easy access to the pilot (for example: logs, screens, etc.). 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. After control knob has been released and pilot stays lit, reinstall any items that were removed for pilot access.
CFX Vent Free Fireplace System BLOWER and OTHER OPTIONAL EQUIPMENT 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.
CFX Vent Free Fireplace System FACE REPLACEMENT PARTS 1 2 Item 1. 2. 88D0011 Description Assy Door, Painted Assy Screen Frame, Painted 880011 CFX face parts Qty.
illustrated parts breakdown - bURNER pARTS WARNING CFX Vent Free Fireplace System 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.
REPLACEMENT PARTS list CFX Vent Free Fireplace System REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER. CFX24 CFX32 Item Description Qty. Natural Propane Natural Propane 1. Burner/Grate Assembly 1 33D4043 33D4043 33D5050 33D5050 2. Injector 1 59D0062 33D4046 33D5040 33D5039 3. Venturi 1 58D0454 33D4058 58D0454 58D0454 4. Millivolt Valve 1 14D0467 14D0468 14D0467 14D0468 5. Pilot Regulator 1 14D0469 -14D0469 -6.
TROUBLESHOOTING warning CFX Vent Free Fireplace System Turn appliance OFF and allow to cool before servicing. Only a qualified service person should service and repair the heater. Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM POSSIBLE CAUSE REMEDY When ignitor button is pressed, there is no spark at ODS/pilot. 1. Ignitor electrode positioned wrong. 1 Replace ignitor. 2. Ignitor electrode is broken. 2. Replace ignitor. 3.
CFX Vent Free Fireplace System WARNING TROUBLESHOOTING 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 gas supplier immediately. OBSERVED PROBLEM POSSIBLE CAUSE REMEDY ODS/pilot lights, but flame 1. Control knob not fully pressed in. goes out when control knob 2. Control knob not pressed in long is released. enough. 1. Press in control knob fully. 2.
CFX Vent Free Fireplace System 34 88D0011
Limited lifetime warrantyCFX policy 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.
MHSC 149 Cleveland Drive • Paris, Kentucky 40361 www.mhsc.com FEBRUARY 2009 88D0011 • Rev.