VENT-FREE YELLOW FLAME GAS LOG HEATER MODELS WZ(N,L)18HLA WZ(N,L)24HLA WZ(N,L)18MVA WZ(N,L)24MVA WZ(N,L)30MVA WARNING: 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.
TABLE OF CONTENTS Specifications............................................. 3 Safety......................................................... 3 Product Features........................................ 5 Local Codes............................................... 5 Unpacking.................................................. 5 Qualified Installing Agency......................... 6 Water Vapor: A By-Product Of Unvented Room Heaters...................... 6 Air For Combustion and Ventilation............
SPECIFICATIONS MODEL Ignition Gas Type Input Rating Manifold Pressure Inlet Gas Pressure* (inches of water) MODEL WZN18(HL,MV)A WZN24(HL,MV)A Piezo Ignitor Piezo Ignitor WZN30MVA Piezo Ignitor Natural Natural Natural 32,000 BTU/Hr 34,000 BTU/Hr 40,000 BTU/Hr 3" W.C. 3" W.C. 3" W.C. Max. 10.5" W.C. Max. 10.5" W.C. Max. 10.5" W.C. Min. 5" W.C. Min. 5" W.C. Min. 5" W.C.
SAFETY WARNING: Any change to this heater or its controls can be dangerous. WARNING: Do not place clothing or other flammable material on or near the appliance. Never place any objects in the heater. WARNING: Due to high temperatures, the appliance should be located out of traffic and away from furniture and draperies. WARNING: Heater becomes very hot when running. Keep children and adults away from hot surfaces to avoid burns or clothing ignition. Heater will remain hot for a time after shutoff.
PRODUCT FEATURES This heater is clean burning. It requires no outside venting. There is no heat loss out of a vent or up a chimney. Heat is generated by realistic, dancing yellow flames. This heater is designed for vent-free operation with flue damper closed. It has been tested and approved to ANSI Z21.11.2 standard for unvented heaters. State and local codes in some areas prohibit the use of vent-free heaters.
QUALIFIED INSTALLING AGENCY Only a qualified agency should install and replace gas piping, gas utilization equipment or accessories, and repair and equipment servicing.
AIR FOR COMBUSTION AND VENTILATION 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. VENTILATION AIR Ventilation Air From Inside Building This fresh air would come from an adjoining unconfined space.
INSTALLATION NOTICE: This heater is intended for use as supplemental heat. Use this heater along with your primary heating system. Do not install this heater as your primary heat source. If you have a central heating system, you may run system’s circulating blower while using heater. This will help circulate the heat throughout the house. In the event of a power outage, you can use this heater as your primary heat source. WARNING: A qualified service person must install heater. Follow all local codes.
INSTALLATION IMPORTANT: Vent-free heaters add moisture to the air. Although this is beneficial, installing heater in rooms without enough ventilation air may cause mildew to form too much moisture. See Air for Combustion and Ventilation, pages 6 and 7. Before beginning assembly or operation of the product, make sure all parts are present. Compare parts with package contents list. If any part is missing or damaged, do not attempt to assemble, install or operate the product.
INSTALLATION NOTICE: This heater may be used as a vented product. If so, you must always operate log set with chimney flue damper open. If running log set with damper open, noncombustible material above fireplace opening is not needed. Go to Installing Damper Clamp Accessory for Vented Operation, page 11. If Using Mantel You must have noncombustible material(s) above the fireplace opening. Noncombustible materials (such as slate, marble, tile, etc.) must be at least 1/2" thick.
INSTALLATION FLOOR CLEARANCES A. If installing appliance on the floor level, you must maintain the minimum distance of 14" to combustibles (see Figure 8). 14" Min. B. If combustible materials are less than 14" to the fireplace, you must install appliance at least 5" above the combustible flooring (see Figure 9). Combustible Material Hearth 5" Min.
INSTALLATION INSTALLING HEATER BASE ASSEMBLY WARNING: You must secure this heater to fireplace floor. If not, heater will move when you adjust controls. Moving heater may cause a gas leak. WARNING: If installing in a sunken fireplace, special care is needed. You must raise the fireplace floor to allow access to heater control panel. This will insure adequate air flow and guard against sooting and controls being damaged. Raise fireplace floor with noncombustible material. Make sure material is secure. 2.
INSTALLATION CONNECTING TO GAS SUPPLY WARNING: A qualified service technician must connect heater to gas supply. Follow all local codes. WARNING: This appliance requires a 1/2" NPT (National Pipe Thread) inlet connection to the pressure regulator. WARNING: Do not overtighten gas connections. WARNING: For natural gas, Never connect heater to private (non-utility) gas wells. This gas is commonly known as wellhead gas. CAUTION: For propane/LP gas, never connect heater directly to the gas supply.
INSTALLATION Typical Inlet Pipe Diameters Use 1/2" black iron pipe or greater. Installation must include an equipment shutoff valve, union, and plugged 1/8" NPT tap. Locate NPT tap within reach for test gauge hook up. NPT tap must be upstream from heater (see Figure 13). IMPORTANT: Install an equipment shutoff valve in an accessible location. The equipment shutoff valve is for turning on or shutting off the gas to the appliance. For propane/LP installations, apply pipe joint sealant lightly to male threads.
INSTALLATION CHECKING GAS CONNECTIONS WARNING: Test all gas piping and connections, internal and external to unit, for leaks after installing or servicing. Correct all leaks at once. WARNING: Never use an open flame to check .for a leak. Apply a noncorrosive leak detection fluid to all joints. If bubbles form, there is a leak. Correct all leaks at once. PRESSURE TESTING GAS SUPPLY PIPING SYSTEM Test Pressures In Excess Of 1/2 PSIG (3.5 kPa) 1.
INSTALLATION ELECTRICAL WIRING (MILLIVOLT) CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. Note: The millivolt valve is a self-powered combination gas control that does not require 110 VAC to operate.
INSTALLATION 2. Remove the thermostat sensing bulb out Thermostat Sensing Bulb of the plastic clip (see Figure 22). IMPORTANT: Do not force or bend the thermostat sensing bulb or capillary. 3. The thermostat sensing bulb may be locat- Adhesive-Backed ed to the lower right front side of fireplace. Mounting Clip Determine location of sensing bulb, but do not mount sensing bulb until step 5. If you have a masonry fireplace, (see Figure Figure 21 - Installing Thermostat Sensing 21 for location).
INSTALLATION INSTALLING LOGS WARNING: 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. CAUTION: After installation and periodically thereafter, check to ensure that no yellow flame comes in contact with any log. With the heater set to High, check to see if yellow flames contact any log. If so, reposition logs according to the log installation instructions in this manual.
INSTALLATION 5. Place log #5 on the top of log #1 and log #2, inserting pin in log #1 into the hole in the bottom of log #5 (see Figure 27). 6. Place log #6 on the top of log #1 and log #3, inserting pin in log #1 into the hole in the bottom of log #6. Be sure the opposite end of log #6 aligns with the recess in log #3 (see Figure 27). 7. Add lava rocks around the grate base of heater. Do not place any lava rocks on logs or burner.
OPERATION MILLIVOLT CONTROL MODELS (MVA) LIGHTING INSTRUCTIONS WARNING: You must operate this heater with the screen in place. Make sure screen is installed before running heater. NOTICE: During initial operation of new heater, burning logs will give off a paper-burning smell. Orange flame will also be present. Open damper or window to vent smell. This will only last a few hours. 1. STOP! Read the safety information, page 19. 2. Make sure equipment shutoff valve is fully open. 3.
OPERATION 11. If the gas logs will not operate, see To Turn Off Gas to Appliance and call our technical service department at 1-866-573-0674. CAUTION: Do not try to adjust heating levels by using the equipment shutoff valve. Thermopile Pilot Tube Ignitor Electrode Thermocouple WARNING: Wait 30 seconds before readjusting the heater when the control knob has been turned down to a lower setting. Figure 29 - Pilot Assembly (MVA model) TO TURN OFF GAS TO APPLIANCE Shutting Off Heater 1.
OPERATION 6. With control knob pressed in, push down and release ignitor button. This will light pilot. The pilot is attached to the rear of the burner. If needed, keep pressing ignitor button until pilot lights. Note: If pilot does not stay lit, refer to Troubleshooting, pages 25 though 28. Also contact a qualified service technician or gas supplier for repairs. Until repairs are made, light pilot with match. To light pilot with match, see Manual Lighting Procedure. 7.
INSPECTING BURNERS IMPORTANT: Owner’s should check pilot flame pattern and burner flame pattern often. Incorrect flame patterns indicate the need for cleaning (see Care and Maintenance, page 24) or service. WARNING: Only a qualified service person should service and repair heater. This includes maintenance requiring replacement or alteration of components. PILOT FLAME PATTERN Figure 31 shows a correct pilot flame pattern. Figure 32 shows an incorrect pilot flame pattern.
CARE AND MAINTENANCE WARNING: Turn off heater and let cool before servicing. CAUTION: You must keep control areas, burner, and circulating air passageways of heater clean. Inspect these areas of heater before each use. Have heater inspected yearly by a qualified service technician. Heater may need more frequent cleaning due to excessive lint from carpeting, bedding material, pet hair, etc. WARNING: Failure to keep the primary air opening(s) of the burner(s) clean may result in sooting and property damage.
TROUBLESHOOTING WARNING: If you smell gas: • Shut off gas supply. • 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. WARNING: Only a qualified service technician should service and repair heater. Make sure that power is turned off before proceeding.
TROUBLESHOOTING Problem Possible Cause Corrective Action When ignitor button is 1. Ignitor electrode is posi- 1. Replace electrode. pressed in, there is no tioned wrong. Ignitor elecspark at ODS/pilot. trode is broken. 2. Ignitor electrode is not con- 2. Replace ignitor cable. nected to ignitor cable. 3. Ignitor cable is pinched or 3. Free ignitor cable if pinched wet. by any metal or tubing. Keep ignitor cable dry. 4 Broken ignitor cable. 4. Replace ignitor cable. 5. Bad piezo ignitor. 5.
TROUBLESHOOTING Problem Burner does not light after ODS/pilot is lit. Possible Cause Corrective Action 1. Burner orifice is clogged. 1. Clean burner orifice (see Care and Maintenance, page 24) or replace burner orifice. 2. Burner orifice diameter is too 2. Replace burner orifice. small. 3. Inlet gas pressure is too low. 3. Contact local gas supplier. Delayed ignition of 1. Manifold pressure is too low. 1. Contact local gas supplier. burner. 2. Burner orifice is clogged. 2.
TROUBLESHOOTING Problem Possible Cause Corrective Action Heater produces a click- 1. Metal is expanding while 1. This is common with most ing/ticking noise just after heating or contracting while heaters. If noise is excesburner is lit or shut off. cooling. sive, contact qualified service technician. White powder residue 1. When heated, the vapors 1. Turn heater off when using forming within burner from furniture polish, wax, furniture polish, wax, carpet box or on adjacent walls carpet cleaners, etc.
REPLACEMENT PARTS Note: Use only original replacement parts. This will protect your warranty coverage for parts replaced under warranty. PARTS UNDER WARRANTY Contact authorized dealers of this product. If they can’t supply original replacement parts, call Customer Service toll free at 1-866-573-6074 for referral information.
PARTS MODELS WZ(N,L)18MVA, WZ(N,L)24MVA, WZ(N,L)30MVA 21 20 16 18 17 3 24" Log Set Shown 19 13 2 14 15 8 7 1 9 5 6 4 10 12 30 11 www.usaprocom.
PARTS MODELS WZ(N,L)18MVA, WZ(N,L)24MVA, WZ(N,L)30MVA This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 29 of this manual.
PARTS MODELS WZ(N,L)18HLA, WZ(N,L)24HLA 16 15 11 13 12 24" Log Set Shown 14 2 3 8 7 9 10 1 4 5 6 32 www.usaprocom.
PARTS MODELS WZ(N,L)18HLA, WZ(N,L)24HLA This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 29 of this manual.
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WARRANTY KEEP THIS WARRANTY Model ________________________________ Serial No. _____________________________ Date Purchased ________________________ Keep receipt for warranty verification. REGISTER YOUR PRODUCT AT WWW.USAPROCOM.COM IMPORTANT: We urge you to register your product within 10 days of date of installation, complete with entire serial number which can be found on the rating plate. Please fill out the warranty information above for your personal records. Retain this manual for future reference.
