Owner's Manual and Instructions GUARDIAN ® Agricultural Animal Confinement Building Heaters MODELS OUTPUT (Btuh) AD250 250,000 FUEL All Models are available in either L.P. Gas Vapor Withdrawal or Natural Gas Configurations. Certification by: Congratulations! You have purchased the finest agricultural building heater available. Your new L.B. White heater incorporates the benefits from the most experienced manufacturer of heating products using state-of-the-art technology. We, at 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 PAGE SECTION General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Heater Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Specifications Model AD250 SPECIFICATIONS L.P Gas Natural Gas Maximum Input (BTUH) Minimum Input (BTUH) 250,000 160,000 Ventilation Air Required to Support Combustion 1,050 CFM Inlet Gas Supply Pressure Acceptable at the Inlet of the Heater for Purpose of Input Adjustment 11 in. W.C. 7 in. W.C. 10 in. W.C. 4 in. W.C. MAX. 11.58 lbs. 250 cu. ft. MIN. 7.41 lbs. 160 cu. ft. MIN. Burner Manifold Pressure Fuel Consumption Per Hour 13.5 in. W.C. MAX.
Safety Precautions WARNING Asphyxiation Hazard ■ Do not use this heater for heating human living L.B. White Company to determine combustion air quarters. ventilation requirements of the heater. ■ Do not use in unventilated areas. ■ The flow of combustion and ventilation air must not be obstructed. ■ 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. 2): FIG. 3 NOTE: REGULATORS SHOULD ALWAYS BE MOUNTED OUTDOORS. IF CIRCUMSTANCES FORCE INSTALLING THE REGULATOR INDOORS, THE REGULATOR'S VENT MUST BE VENTED OUTDOORS USING VENT LINE NO SMALLER THAN VENT OPENING.
THERMOSTAT INSTALLATION WARNING Electrical Shock Hazard ■ Disconnect the electrical supply before connecting the thermostat to the heater. ■ Failure to follow this warning can result in electrical shock, leading to personal injury or death. 1. To Connect the Series Tap Plug Thermostat Kit: a. Connect the power cord of the heater to the female side of the plug on the end of the thermostat cord. b.
Start-Up Instructions is a red light emitting diode (LED). This LED indicates the status of the heater. The LED is visible external of the control enclosure through the plastic eye. A constant light from the LED is an indicator that the heater is functioning correctly. Any flash pattern by the LED is indicative that there is a problem in the operation of the heater. Refer to the troubleshooting decal on the access panel at the fan motor end of the heater for assistance in troubleshooting.
Variable Heat Output 1. Some models of propane (LP) gas or natural gas heaters have a throttle valve for varying heat output located between the gas control valve and gas manifold assemblies. THIS IS NOT A MANUAL GAS SHUT OFF VALVE. 2. The throttle valve can be adjusted to deliver either minimum heat or maximum heat. When the throttle valve handle is parallel to the gas flow, the valve is completely open to deliver maximum heat output. (Refer to Fig. 7.
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 MOTOR AND FAN WHEEL ASSEMBLY 1. Shut off the gas supply to the heater. NOTES: a. Fan wheel to motor mount plate spacing must be adjusted to the clearance specified in the table below before tightening the fan wheel to the motor shaft. 2. Disconnect the heater from its electrical supply. 3. Open the case fan access panel on the control box end of the heater. b. Make sure that set screw(s) of the fan are on the flats of motor shaf t when tightening. 4. Disconnect the motor leads. 5.
TO REMOVE CONTROL BOX AND WIRE HARNESS FROM HEATER 1. Shut off the gas supply to the heater. 8. To assemble, reverse above procedure. FIG. 11 2. Disconnect the heater from its electrical supply. 3. Open the motor access panel. REMOVE 3 SCREWS (EACH SIDE) 4. Disconnect flame sensor lead and high voltage ignition lead from ignition control and route these back through the rubber grommet in the back of the control box. 5.
Gas Pressure Checks WARNING ■ Do not disassemble the gas control valve. ■ Do not attempt to replace any components of the gas FIG. 14 OUTLET PRESSURE TAP INTERNAL PRESSURE REGULATOR LOW PRESSURE GUAGE LOW PRESSURE GUAGE control valve. ON ■ The gas control valve must be replaced if any physical OFF damage occurs to the control valve assembly. INLET PRESSURE TAP ■ Failure to follow this warning will result in fire or explosions, leading to injury or death to humans, and property damage.
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 switches should be tested a minimum of once per year when the heater is given a thorough cleaning. 5.
Troubleshooting Instructions READ THIS ENTIRE SECTION BEFORE BEGINNING TO TROUBLESHOOT PROBLEMS. WARNING Electrical Shock and Burn Hazard ■ Do not attempt to service or repair this heater unless you are a properly trained and qualified gas heater service person. ■ 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.
Troubleshooting Instructions SPARK IGNITION OPERATION SEQUENCE: — Line Voltage is Sent to Transformer and to Ignition Control — 24 V.A.C. is sent from Transformer to the Thermostat — A call for Heat Occurs — Thermostat Returns 24 VAC to Ignition Control — Red Light on Ignition Control is Illuminated — Ignition Control Module Performs an Internal Safe Start Check -- Internal Components are Tested -- Voltage is sent to Flame Sensor from Ignition Control to Start Flame Proving Process.
20 LED light not on during a call for heat. Problem LED constant on No Is heater plugged in? No Are 24 volts supplied to ignition module? Yes Yes Set thermostat above room temperature. No Is thermostat set above room temperature? LED light in module is defective. Replace ignition module. Check dataplate for electrical supply requirements. Provide proper voltage from electrical supply. Check circuit breakers in building electrical system. Check power cord for continuity.
21 Is airproving switch shorted? (Perform continuity check on airproving switch.) No Is flapper or air-proving switch arm binding on housing? Is there an obstruction in heater outlet? Yes Yes Replace air-proving switch. Repair and/or remove obstructions. Heater has attempted two ignition trials. Heater is in a 15 minute wait period before attempting its third (final) trial for ignition.
22 Two Times Flash pattern begins 12 seconds after condition occurs. (Pattern indicates lack of air proving in fan section of unit.) Yes Yes If improper voltage is supplied, contact electrician. - OR If no voltage is supplied to motor, check wiring, replace motor relay (if applicable), or replace ignition control module. No Is proper voltage supplied to motor from ignition module? No Does fan motor start up for prepurge during initial call for heat? Defective motor or capacitor. Replace motor.
23 Remove orifice and burner casting. Blow out with compressed air or clean with a soft brush. No No Yes Yes Yes Yes No Is Igniter Properly Gapped? Yes Clean flame sensor with emery cloth or steel wool. No Is flame sensor clean? Yes No No Is flame sensor properly positioned? No Is flame sensor insulator cracked? Yes Yes Yes Contact electrician. System must be grounded for proper operation. No Is heater properly grounded? Replace sensor.
24 If DSI board does not reset, then replace the board. (Internal board fault.) If DSI board resets, then have qualified electrician check power source for power quality problems. (Frequency, line noise, line spikes, loose connections, too small wire gauge.) Flame Sense Degradation. See flame sensor related problems in three time flash pattern.
Electrical Connection and Ladder Diagram CAUTION Always refer to the heater’s electrical connection diagram when servicing to avoid wiring errors and heater malfunction. Check for proper operation after servicing. WARNING: THIS HEATER MAY START AT ANY TIME POWER CORD GROUND OPTIONAL THERMOSTAT WHITE BLACK GREEN AIR PROVING SWITCH GREEN BLACK BROWN IGNITER FLAME SENSOR BROWN BLUE BLUE YELLOW WHITE WHITE GREEN GREEN GREEN LI IND L.E.D.
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. Ignition Control Module Controls the ignition sequence and operation of the heater as well as monitoring the safety sevices.
Parts Identification PARTS SCHEMATIC 20 24 23 25 27 26 22 28 21 29 30 31 32 19 33 18 17 16 34 15 14 7 13 1 2 12 3 4 11 5 10 35 9 36 8 6 27
Parts Identification PARTS LIST Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Description Regulator, LP Gas, 2nd Stage, Vent Over Outlet Regulator, LP Gas, 2nd Stage, Vent Over Side Regulator, Natural Gas (5 PSIG Inlet, 13.5 Outlet) Nipple, 3 1/2 in. Valve, Manual Shut Off 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.
