Owner's Manual and Instructions GUARDIAN ® Agricultural Animal Confinement Building Heaters with Smart Sense™ Automatic Variable Rate Heat For Direct Connection to a Building’s Environment Controller MODELS AW250 OUTPUT (Btuh) 250,000 FUEL Propane-Vapor Withdrawal or Natural Gas Patent Pending Congratulations! You have purchased the finest agricultural building heater available. Your new L.B.
GENERAL HAZARD WARNING ■ Failure to comply with the precautions and instructions provided with this heater, can result in: — Death — Serious bodily injury or burns — Property damage or loss from fire or explosion — Asphyxiation due to lack of adequate air supply or carbon monoxide poisoning — Electrical shock ■ Read this Owner’s Manual before installing or using this heater. ■ Only properly-trained service people should repair or install this heater. ■ Save this Owner’s Manual for future use and reference.
Table of Contents SECTION PAGE General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Heater Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Specifications Model AW250 SPECIFICATIONS Propane Gas Type Fuel Maximum Input (BTUH) Minimum Input (BTUH) 250,000 65,000 Ventilation Air Required to Support Combustion (CFM) Inlet Gas Supply Pressure Acceptable at the MAX. Inlet of the Heater for Purpose of Input MIN. Adjustment (in. W.C.) Burner Manifold Pressure (in.W.C.) MAX. 1,050 13.5 11.0 8.5 10.0 7.5 0.5 MIN. Fuel Consumption Per Hour Natural Gas MAX. MIN. 11.58 lbs. 250 cu.ft 3.01 lbs. 65 cu.
Basic Operation This heater uses Smart Sense™ technology for variable rate heat control. When integrated to a building controller and L.B.White Smart Box™, precise, automated control of the environment is achieved by operating the heater over a broad heat range from 65,000 btu to 250,000 btu. This provides better, more even temperature distribution by allowing the heater to operate where it needs to. This results in consistent temperatures and reduced fuel consumption. Sequence of Operation a.
Safety Precautions WARNING Asphyxiation Hazard ■ Do not use this heater for heating human living quarters. ■ Do not use in unventilated areas. ■ The flow of combustion and ventilation air must not be obstructed. L.B. White Company to determine combustion air ventilation requirements of the heater. ■ Lack of proper ventilation air will lead to improper combustion. ■ Proper ventilation air must be provided to support the combustion air requirements of the heater being used.
1.Do not attempt to install, repair, or service this heater or the gas supply line unless you have continuing expert training and knowledge of gas heaters. Qualifications for service and installation of this equipment are as follows: a. To be a qualified gas heater service person, you must have sufficient training and experience to handle all aspects of gas-fired heater installation, service and repair.
Installation Instructions GENERAL WARNING Fire or explosion hazard. Can cause property damage, severe injury or death. 1. Disconnect power supply before wiring to prevent electrical shock or equipment damage. 2. To avoid dangerous accumulation of fuel gas, turn off gas supply at the appliance service valve before starting installation, and perform gas leak test after completion of installation. 3. Do not force the gas control knob. Use only your hand to turn the gas control knob. Never use any tools.
12. A qualified service agency must check for proper operating gas pressure upon installation of the heater. 13. Light according to instructions on heater or within owner's manual. 14. It is extremely important to use the proper size and type of gas supply line to assure proper functioning of the heater. Contact your fuel gas supplier for proper line sizing and installation. 15. This heater can be configured for use with either L.P. gas vapor withdrawal or natural gas.
HANGING INSTRUCTIONS 1. Assemble according to the illustration and tighten all eyebolts securely. See Fig.3. FIG. 4 NOTE: REGULATORS SHOULD ALWAYS BE MOUNTED OUTDOORS. IF NOTE: REGULATORSFORCE SHOULDINSTALLING ALWAYS BE MOUNTED OUTDOORS. IFINDOORS, CIRCUMSTANCES THE REGULATOR CIRCUMSTANCES FORCE INSTALLING THE REGULATOR INDOORS, THE REGULATOR’S VENT BEVENTED VENTED OUTDOORS USING VENT THE REGULATOR'S VENTMUST MUST BE OUTDOORS USING VENT LINE NOLINE SMALLER THAN VENT NO SMALLER THAN VENTOPENING. OPENING.
MANUAL SHUT-OFF VALVE, HOSE AND REGULATOR ASSEMBLY 1. Always use approved pipe thread compound suitable for use with L.P. gas or natural gas on the threaded connections. FIG. 6 VALVE, MANUAL SHUT-OFF 2. Assemble the components together according to the figure. This view is to show general assembly of the components only. The regulator must always be mounted so its vent, regardless of location on the regulator, is always pointed downward. NIPPLE REGULATOR 4.
INTERCONNECTION FOR VARIABLE HEAT ■ Use customer supplied 1/4 insulated female terminals when interconnecting the building’s environment controller to the heater. ■ Use 18 gauge electrical wiring for supply of DC volts or milliamp signal from building controller to signal conditioner. 1. Open the heater’s control box for access to signal conditioner. See Fig.7 for location. FIG. 7 B. Connecting heater to building controller with 4-20 milliamp output signal. a.
Start-Up Instructions Follow steps 1 - 6 on initial start-up after heater installation by a qualified gas heater service person. For normal startup, set the building controller to call for heat. The heater will start. 1. Open all manual fuel supply valves and check for gas leaks using approved leak detectors. 2. Connect the electrical cord to an approved electrical outlet. 3. Set the building controller to desired room temperature. 4.
Cleaning Instructions WARNING Fire, Burn, and Explosion Hazard ■ This heater contains electrical and mechanical components in the gas management, safety and airflow systems. ■ Such components may become inoperative or fail due to dust, dirt, wear, aging, or the corrosive atmosphere of an animal confinement building. ■ Periodic cleaning and inspection as well as proper maintenance are essential to avoid serious injury or property damage. 1.
Service Instructions GENERAL WARNING Burn Hazard ■ Heater surfaces are hot for a period of time after the heater has been shut down. ■ Allow the heater to cool before performing service, maintenance, or cleaning. ■ Failure to follow this warning will result in burns causing injury. WARNING Fire and Explosion Hazard ■ Do not disassemble or attempt to repair any heater components or gas train components. ■ All component parts must be replaced if defects are found.
AIR PROVING SWITCH WITH PADDLE 1. Open the case access panel on the control box end of the heater. 2. Remove the two (2) sheet metal screws holding switch with bracket to blower housing. Remove assembly by turning the switch assembly 90°so paddle on the switch arm can be pulled through oblong hole on side of fan housing. NUTS FIG. 11 PADDLE the the the the 3. Disconnect the leads from the air proving switch. SWITCH W/PADDLE OBLONG HOLE 4. To replace the switch, reverse the above procedure.
TESTING THE MANUAL RESET HIGH LIMIT SWITCH WARNING Fire Hazard ■ Do not operate the heater with the high limit switch ■ bypassed. Operating the heater a bypass high limit switch may lead to overheating, possibly resulting in a fire, with subsequent damage to the heater, building damage, or loss of livestock. The high limit switch should be tested a minimum of once per year when the heater is given a thorough cleaning. 5.
Gas Pressure Checks WARNING ■ Do not disassemble the gas control valve. ■ Do not attempt to replace any components of the gas 2. Securely connect a pressure gauge to each pressure tap. See Fig.17. FIG. 17 control valve. ■ The gas control valve must be replaced if any physical damage occurs to the control valve assembly. ■ Failure to follow this warning will result in fire or explosions, leading to injury or death to humans, and property damage.
Troubleshooting Instructions READ THIS ENTIRE SECTION BEFORE BEGINNING TO TROUBLESHOOT PROBLEMS. WARNING Electrical Shock and Burn Hazard ■ Troubleshooting this system may require operating the unit with line voltage present and gas on. Use extreme caution when working on the heater. ■ Failure to follow this warning may result in property damage, personal injury or death. The troubleshooting flow charts on the following pages provide systematic procedures for isolating equipment problems.
HOT SURFACE IGNITION OPERATION SEQUENCE: — A call for heat occurs from the building’s environment control. — 115 VAC is sent to: -- 40 VA transformer and to ignition control -- 20 VA transformer — 0-10 VDC or 4-20 milliamp signal is sent to signal conditioner from building controller. — 20 VA transformer reduces line voltage to 24 VAC.
Red LED not on during a call for heat. Problem No Are 24 volts supplied to ignition module? Yes Poor electrical connection or broken wire present. Repair or replace. No No Is proper voltage supplied to heater power cord and through power cord? Yes Set controller to call for heat. No Check electrical connections and power supply to transformer. Repair as necessary. No Yes Replace transformer No Are 24 volts supplied from transformer? Defective variable rate gas control solenoid valve.
Is airproving switch shorted? (Perform continuity check on airproving switch.) No Is air-proving switch arm or paddle binding on housing? Is there an obstruction in heater outlet? Yes Yes Replace air-proving switch Repair and/or remove obstructions. check for damaged fan housing. Clean or repair as needed. Heater has attempted two ignition trials. Heater is in a 15 minute wait period before attempting its third (final) trial for ignition.
Air proving switch do not close during a call for heat. Two Times Yes No Are 24 volts sent to air proving switch? Yes Defective motor or capacitor. Check wiring between ignition control module terminal PSI and and air proving switch. Repair or replace as necessary. If wiring is good replace ignition control. Yes If Improper voltage is supplied, contact electrician. - OR If no voltage is supplied to motor, check wiring, or replace ignition control module.
Remove components and blow out with compressed air or clean with a soft brush. No No Yes Yes Connect igniter to igniter power supply wiring. No Is igniter properly connected? No No Are 115 volts supplied from ignition control module to igniter? Yes No Are high limit switch contacts closed? Yes No Are 24 volts supplied to the Yes gas control Valve? Is proper burner manifold pressure read at outlet of gas valve? Yes Clean flame sensor with emery cloth or steel wool.
See flame sensor related problems in “Three Time” flash pattern. The heater will continue to operate as normal. This flash pattern identifies that flame sense current is low and that flame failure or improper operation can occur at any time. Five Times Rapid On/Off Cycling of the Burner.
Electrical Connection and Ladder Diagram 26
Heater Component Function Air Proving Switch Safety device used to insure that the proper air flow is being achieved before the gas valve is opened. Burner Cast iron component used to channel gas and provide an area at which the fuel may ignite. Burner Orifice Brass metering device used to feed gas to burner at a specific rate. Fan Housing Chamber used for compressing air for ef ficient air movement.
Parts Identification PARTS SCHEMATIC 36 28
Parts Identification PARTS LIST Item 1 2 3 4 5 6 7 Description Valve, manual shut off with nipple Regulator, Second stage, vent over outlet Second stage, vent over side Second Stage, vent over outlet Hose, 1/2 in. ID x 10 ft.
Warranty Policy HEATER L.B. White Co., Inc. warrants that the component parts of its heater are free from defects in material and workmanship, when properly installed, operated, and maintained in accordance with the Installation and Maintenance Instructions, safety guides and labels contained with each unit. If, within 12 months from the date of purchase by the end user, any component is found to be defective, L.B. White Co., Inc.
