Gas Unit Heaters Duct Furnaces Horizontal - 60 HZ Form No. LF (10/2011) LF24 Standard

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1 LF Standard Features Horizontal unit heaters are compact in design and easy to install. Steady State Efficiencies of up to 80.%. Ideal for economical commercial heating systems. Shipped completely assembled with controls factory installed and wired. Each unit is test operated at the factory to ensure proper operation and dependability. Installer has only to locate unit, make unit gas supply, electrical connections and mount thermostat to complete the installation. Units may be vented horizontally or vertically. pprovals Unit certified by CS International. Listed by California Energy Commission (CEC) Units are certified for natural or LPG/Propane gas ISO 900 Registered Manufacturing Quality System Gas Unit Heaters Duct Furnaces Horizontal - 60 HZ Form LF (0/0) Thermal Efficiency - up to 80.% Input - 00,000 to 390,000 Btuh Warranty Heat exchanger stainless steel - fifteen year limited warranty, aluminized steel - ten year limited warranty. ll other covered components have a limited warranty of one year. Refer to the Equipment Limited Warranty certificate included with the equipment for details. Cabinet Constructed of heavy gauge painted steel. Inside cabinet insulation keep outer cabinet surface temperatures low. djustable louvers are furnished on cabinet for control of air flow direction. Wiring junction box is conveniently located on outside of cabinet for easy access. Box contains all electrical and safety controls. Terminal strip provided for thermostat connections. 3/8" x 6 rivet nuts are located on the top of cabinet for suspending unit. See dimension drawing.

2 Identification Unit Type LF = Unit Heater LF - 00 Heating System volt redundant combination gas control valve combines a manual main shutoff valve, pressure regulation and automatic electric valve (dual) into one compact combination control. Solid-state electronic direct spark ignition control provides positive main burner ignition. Spark is intermittent and occurs only when required. Heat Exchanger Type = luminized Steel S = Stainless Steel Nominal Gas Heat Input 00 = 00,000 Btuh =,000 Btuh =,000 Btuh 7 = 7,00 Btuh 00 = 9,000 Btuh 30 = 30,000 Btuh 0 = 0,000 Btuh 300 = 300,000 Btuh 3 = 3,000 Btuh 00 = 390,000 Btuh Separate electronic flame sensor control assures safe and reliable operation. Should loss of flame occur, flame sensor controls will initiate 3 attempts at re-ignition before locking out unit operation. Combustion air inducer prepurges heat exchanger and safely vents flue products. Pressure switch proves inducer operation before allowing gas valve to open. Combustion air inducer operates only during heating cycle. Tubular luminized or Stainless Steel Heat Exchanger Tubular heat exchanger is constructed of aluminized or stainless steel for superior resistance to corrosion and oxidation. Curving design of heat exchanger allows complete exposure of heating surfaces to supply air stream. Round tube surfaces create minimum air resistance and allow air to surround all surfaces for excellent heat transfer. Compact design reduces space requirements in unit cabinet. Heat exchanger has been laboratory life cycle tested. Inshot Burners luminized steel inshot burners provide efficient trouble free operation. Burner venturi mixes air and gas in correct proportion for proper combustion. Burner assembly is removable from the unit as a single component for ease of service and each burner may be removed individually. Limit Control Factory installed and accurately located. Limit control has fixed temperature setting and protects heating system from abnormal operating conditions. Combustion ir Inducer Prepurges heat exchanger and safely vents combustion products. Blower motor has sleeve bearings and is thermally protected. Pressure switch prevents unit operation in case of blockage of combustion air inlet or flue outlet. Combustion air inducer on LF-00,,, and units may be rotated 90º to left or right of vertical to facilitate installation. Venting Units may be vented horizontally or vertically. Vertical Venting - LF units are approved for installation with single wall and type B- double wall vent pipe. Horizontal Venting - LF units are approved for installation with single wall or Lennox-approved stainless steel vent kits. - Page -

3 Controls Includes: volt main gas valve with 00% safety shutoff, main shutoff valve, gas pressure regulation (natural & LPG/propane gas models), limit control, transformer and combination ignition/fan timer control board. Combination Direct Spark Ignition/Fan Timer Control Solid-state control board contains all necessary controls and relays to operate unit. Includes: Fan timer control - fan on seconds (fixed), fan off 0 seconds (fixed), terminal strip for thermostat connections, diagnostic LED for troubleshooting, continuous fan operation. Transformer 0V/V transformer furnished as standard. Direct Drive Fan ll models are equipped with efficient and quiet operating direct drive fan. Options Discharge Nozzles To direct discharge air from unit heater. vailable in 30º, º, 60º and 90º style. Fully assembled from heavy-gauge steel. Paint finish matches unit heater. See Dimension Drawings. Hanging Bracket Used to suspend unit heaters on two pipe hangers. contains two brackets and all necessary hardware. Pipe hangers (3/ in.) are not furnished and must be field provided. Horizontal Vent s and Elbow Required for Horizontal Venting pplications Unit Heater Vent Diameter (in.) Upslope Vent Catalog Downslope Vent Catalog º Elbow Catalog 90º Elbow Catalog Minimum Vent Length (ft.) LF-00 LF- LF- LF-7 LF-00 LF-30 LF-0 LF-300 LF-3 LF-00 CVENTKU 7W63 CVENTKD 7W67 CVENTKU 7W6 CVENTKD 7W68 6 CVENT6KU 7W6 CVENT6KD 7W69 CVENTE (Optional) CVENTE (Required) CVENT6E (Required) 87W80 87W8 87W8 CVENTE (Optional) CVENTE (Required) CVENT6E (Required) 7W7 7W7 7W73 Length does not include termination (or elbow where applicable) NOTE: Elbow is required where shown to facilitate connection of horizontal vent kit to flue outlet. Straight Vent Pipe - For Horizontal Venting Unit Heater Vent Diameter (in.) Length (in.) Catalog LF-00 LF- LF- LF-7, LF-00 LF-30, LF-0 LF-300 LF-3 LF-00 CVENTP6 6 7W77 CVENTP 7W78 CVENTP W79 CVENTP6 6 7W80 CVENTP 7W78 CVENTP W8 CVENT6P 6 7W83 CVENT6P W8 - Page 3 -

4 Specifications - LF-00 to LF-30 Gas Heating Perf. - Stainless Steel - luminized Steel Heating Capacity Input - Btuh Heating Capacity Output - Btuh Steady State Efficiency LF -00S LF ,000 80,00 80.% LF -S LF -,000 9,000 LF - S LF -,000 6,000 LF - 7S LF - 7 7,00 38,000 LF - 00S LF ,000 6,000 LF - 30S LF ,000 8,000 Connections - in. Flue size (round) - Vertical Venting Gas Piping Size / / / / / 3/ Fan Data ir Volume -cfm of fans Fan Diameter - in. of blades of motors Motor Output - hp RPM / / / / / /8 07 Weight Data Net Weight - lbs Shipping - Weight - lbs ELECTRICL DT Line Voltage Data - 60 HZ Motor amps Total Unit amps... volts - phase OPTIONL CCESSORIES - MUST BE ORDERED EXTR... Discharge Nozzel Hanging Bracket 3 High ltitude Pressure Switch LPG/Propane 30-9K9 9K9 9K96-9K98 9K99 9K L8 6L9 6L L96 L97 L W L8 63J6 0L07 63J7 -/8 x in. diameter adaptor is furnished with unit for flue connection. -/ x -3/ in. rectangle to in. round adaptor is furnished with unit for flue connection. 3 LF-00 through - models - Combustion air inducer pressure switch must be replaced at altitudes over 00 ft. LF-7 model - Combustion air inducer pressure switch must be replaced at altitudes over 00 ft. - Page -

5 Specifications - LF-0 to LF-00 Gas Heating Performance - Stainless Steel - luminized Steel Heating Capacity Input - Btuh Heating Capacity Output - Btuh Steady State Efficiency LF -0S LF - 0 0,000 0,0 80.% LF - 300S LF ,000,00 80.% LF - 3S LF - 3 3,000 76,000 LF - 00S LF ,000 3,000 Connections - in. Flue size (round) - Vertical venting Gas Piping Size 3/ 3/ 6 3/ 6 3/ Fan Data ir Volume -cfm of fans Fan Diameter - in. of blades of motors Motor Output - hp RPM 00 6 / / / /8 07 Weight Data Net Weight - lbs Shipping Weight - lbs ELECTRICL DT Line Voltage Data - 60 HZ Motor amps Total Unit amps.. volts - phase.. OPTIONL CCESSORIES - MUST BE ORDERED EXTR Discharge Nozzel 30-9K96-9K L L98 Hanging Bracket 8777 LPG/Propane L88 63J7 0L06 -/ x -3/ in. rectangular to in. round adapter is furnished with unit for flue connection. -/ x -3/ in. rectangular to 6 in. round adaptor is furnished with unit for flue connection. Throw Data ir Volume cfm Effective Throw feet LF - 00,, LF - 7, LF LF - 30, LF - 0 LF - 300, LF - 3 LF NOTE - djustable horizontal louvers on unit allow a variation in throw and spread. Throw terminates where velocity reaches 0 ft. per minute. - Page - Maximum Mounting Height Feet LF - 00, 6 LF -, LF - 7 LF - 00 LF - 30, LF - 0 LF - 300, LF - 3 LF Recommended maximum mounting height from floor to bottom of unit. t heights greater than shown air throw distance and air temperature at floor level is affected.

6 High ltitude Information ll units may be fired at full input up to 000 feet above sea level. bove 000 feet, manifold pressure must be adjusted on some units. djust pressure regulator to pressure shown in tables. If unit is installed at an altitude greater than 700 feet, unit must be derated by percent for each additional 000 feet above 700 feet. In Canada, certification for installation at altitudes over 00 feet above sea level is the jurisdiction of the local authorities. Note - This is the only permissible derate for the units. Natural Gas Manifold Pressure - in. w.c ft ft ft ft ft ft ft. LF - 00 LF - LF LF LF - 7 LF - 30,, LF - 00 LF - 0 LF - 3 LF LF - 7 Combustion air inducer pressure switch must be replaced at altitudes from ft. Order 36W9 pressure switch. LF-00 through - models - Combination air inducer pressure switch must be replaced at altitudes over 00 ft. Order pressure switch 36W9 LPG/Propane Manifold Pressure - in. w.c ft ft ft ft ft ft ft. LF - 00 LF - LF LF LF - 7 LF - 30,, LF - 00 LF - 0 LF - 3 LF LF - 7 Combustion air inducer pressure switch must be replaced at altitudes from ft. Order 36W9 pressure switch. LF - 00 through - models - Combination air inducer pressure switch must be replaced at altitudes over 00 ft. Order 36W9 pressure switch. - Page 6 -

7 Installation Clearances Top Sides Rear Bottom Flue 6 inches 6 inches 8 inches 0 inches 6 inches NOTE - Provide adequate clearance for servicing. See Installation Instructions for further installation considerations. Dimensions - in inches Note -Single fan model shown. LF-00,,,7 and 00. LF-30, 0, 300, 3 and 00 models have two fans. Note -Two rivet nuts are furnished on LF-00,,, 7 and 00 models. Four rivet nuts are furnished on LF-30, 0, 300, 3 and 00 models. Maximum Horizontal Vent Lengths of Elbows LF-00,,, 7, 00 LF-30, 0, 300 LF-3 LF Furnished on LF-30, LF-0, LF-300, LF-3 and LF-00 s Only. *7-/8 / / C TOP VIEW 3-/6 B E 3/8-6 RIVETNUTS FOR UNIT SUSPENSION FLUE OUTLET ELECTRICL INLETS F D 3-3/6 DJUSTBLE LOUVERS IR FLOW COMBUSTION IR INDUCER DIRECT DRIVE FN FRONT VIEW HET EXCHNGER SIDE VIEW GS VLVE B C D E F LF - 00 LF - LF - LF - 7 LF - 00 LF - 30 LF - 0 LF LF - 3 LF /6 -/ 9-/6-3/ 3-/ 7-7/8 3-/8 -/ -/ 8-/ 3-/ 8-/6 -/8 3-/ / 3-/ 8-/6 -/8 3-/6 0 7-/ 3-/ 9-3/6 - Page 7 -

8 ccessory Dimensions in inches. Usage LF - 00 LF - LF - LF - 7 LF - 00 LF - 30 LF - 0 LF LF - 3 "" Dimension in inches 8-/ -/ 39-/ -3/6 30 o _ Discharge Nozzle 30 deg 60_ o Discharge Nozzle 3-/ 8-/ 7-7/8-3/6 _ o Discharge Nozzle 8 deg 90_ o Discharge Nozzle 30-7/8 8-/8 LF /6 60 deg 8-3/ -3/6 3-3/ Vent s and ccessories HORIZONTL VENT KITS (UPSLOPE) 3 ND 6 INCH HORIZONTL VENT KITS (DOWNSLOPE) ELBOW (Typical) 90 ELBOW (Typical) STRIGHT PIPE (Typical) Form LF (0/0) 0 llied ir Enterprises LLC, a Lennox International Inc. Company Printed in the U.S.. Phone: (803) Page 8 -

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