If the venting system is disassembled for any reason, a qualified service technician should follow vent installation instructions for proper reassembly and proper sealing of the venting system components. However, more frequent periodic inspections and cleanings should be performed by the homeowner. Clean Lower Control Compartment Keep lower control compartment clean by vacuuming or brushing it out at least twice a year (also clean the air venturi with a brush or wire). More frequent cleaning ma

(406 mm) from a framed wall, must always be measured from a finished surface. If a wall covering such as drywall is to be attached to the rear wall, then the 16 in. (406 mm) must be measured from the drywall surface. It is important that this dimension be exact. Headers may be in direct contact with the appliance top standoff spacers, but must not be supported by them or notched to fit around them. All construction above the appliance must be self-supporting. DO NOT use the appliance for structu

Before installing the appliance, follow these steps: 1. Remove the shipping carton. 2. Remove the shipping pad, exposing the front glass door. 3. Open the spring latch securingthe glass door (under the fi rebox fl oor). Remove the door by tilting it outward at the bottom and liftingit up. Set the door aside, taking care to protect it from inadvertentdamage. See Removing the GlassEnclosure Panel on Page 19. 4. Remove the log set from the fi rebox. Handle logs carefully to prevent breakage. 5. Rem

In addition, when the unit is recessed, the side walls surrounding the unit must not extend beyond the front edge of the unit (see Figure 3). Back 1/2 (13) Sides 1/2 (13) Top Spacers 0 (0) Floor 0 (0) Bottom of Appliance To Ceiling 64 (1626) Vent 1 (25.4) SERVICE CLEARANCES Feet (meters) Front 3 ft. (0.9 m) Table 5: Minimum Clearances [inches (millimeters)] HEARTH EXTENSION A hearth extension is not required with this appliance. If a hearth extension is used, do not block the control compartment

The location should also be free of electrical, plumbing or other heating/air conditioning ducting. Be aware that this is a heat producing appliance. Objects placed above the unit are exposed to elevated temperatures. Do not insulate the space between the appliance and the area above it (see Figure 9 on Page 8). The appliance must be mounted on a fully supported base extending the full width and depth of the unit. The appliance may be located on or near conventional construction materials. Howev

REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS These fi replaces are approved for installation in the US state of Massachusetts if the following additional requirements are met: • Install this appliance in accordance with Massachusetts Rules and Regulations 248 C.M.R. • Installation and repair must be done by a plumber or gas fi tter licensed in the Commonwealth of Massachusetts. • The fl exible gas line connector used shall not exceed 36 in. (92 cm) in length. • The individual manual shut-o

WC (1.12 kPa) 10.5 in. WC (2.61 kPa) Propane 11.0 in. WC (2.74 kPa) 13.0 in. WC (3.23 kPa) Table 2: Inlet Gas Supply Pressure Fuel # Low High Natural Gas 1.6 in. WC (0.40 kPa) 3.5 in. WC (0.87 kPa) Propane 6.3 in. WC (1.57 kPa) 10.0 in. WC (2.49 kPa) Table 3: Manifold Gas Supply Pressure Test gauge connections are provided on the front of the millivolt and electronic gas control valve (identifi ed IN for the inlet and OUT for the manifold side). The control valves have a 3/8 in. (10 mm) NPT thre

Do not use these appliances if any part has been under water. Immediately call a qualifi ed, professional service technician to inspect the appliance and to replace any parts of the control system and any gas control which have been under water. Ne pas utiliser cet appareil s’il a ete plonge, meme partiellement, dans l’eau. Appeler un technicien qualifi e pour inspecter l’appareil et remplacer toute partie du systeme de commande et toute commande qui a ete plongee dans l’eau. Only trim kit(s) su

Les enfants et les adultes devraient etre informes des dangers que posent les temperatures de surface elevees et se tenir a distance afi n d’eviter des brulures ou que leurs vetements ne s’enfl amment. DO NOT ATTEMPT TO ALTER OR MODIFY THE CONSTRUCTION OF THE APPLIANCE OR ITS COMPONENTS. ANY MODIFICATION OR ALTERATION MAY VOID THE WARRANTY, CERTIFICATION AND LISTINGS OF THIS UNIT. NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE. LENNOX HEARTH PRODUCTS • MERIT PLUS® B-VENT GAS FIREPLACES (MPB33/3

• (1) Hood (behind the top louver assembly). INTRODUCTION The Millivolt appliances have a millivolt gas control valve with piezo ignition system. If any optional accessories that will require electrical power are to be installed, the electrical power must be provided at the time of appliance installation. The Electronic appliances are designed to operate on natural or propane gas. An electronic intermittent pilot ignition system provides safe, effi cient operation. External electrical power is r