Owner's Manual and Instructions Therma Grow™ Greenhouse Heaters MODELS OUTPUT (Btuh) HW120 120,000 FUEL Available in either L.P. Gas Vapor Withdrawal or Natural Gas Configurations. Congratulations! You have purchased the finest direct fired greenhouse 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 HW120 SPECIFICATIONS Propane Gas Natural Gas Maximum Input (BTUH) Minimum Input (BTUH) 120,000 65,000 EXHAUST FAN Indoor Mounting Air Exchange Requirements (1) SHUTTERED AIR INLET 300 CFM 120 sq. in. Outdoor Mounting Air SHUTTERED Exchange Requirements (1) EXHAUST OUTLET Inlet Gas Supply Pressure Acceptable at the Inlet of the Heater for Purpose of Input Adjustment (In. W.C.) Burner Manifold Pressure (In. W.C.) Fuel Consumption Per Hour 64 sq. in. MAX. 13.5 11.
Safety Precautions WARNING ■ ■ ■ ■ Asphyxiation Hazard Do not use this heater for heating human living ■ Refer to the specification section and installation quarters. instructions of the heater’s Owner’s Manual, heater dataplate, or contact the L.B. White Company to determine air exchange requirements of the heater. Do not use in areas without proper air exchange. See air exchange requirements on page 4 or on heater’s dataplate. ■ Lack of proper air exchange will lead to improper combustion.
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 Direct fired heaters discharge combustion by-products with the heated air in to the area being heated. These include CO, CO2, NO, NO2, and Ethylene. These gases can result in harm to the worker or the plants. This greenhouse heater has been specifically developed for very low levels of these combustion by-products.
----- -- ---- Furthermore tighten the gas connections as necessary to stop the leak. After all connections are checked and any leaks are stopped, turn on the main burner. Stand clear while the main burner ignites to prevent injury caused from hidden leaks that could cause flashback. With the main burner in operation, check all connections, hose connections, fittings and joints as well as the gas control valve inlet and outlet connections with approved gas leak detectors.
INDOOR VENTILATION REQUIREMENTS This heater requires a properly sized, motorized air inlet shutter and exhaust fan for indoor installation. These components, along with specific instructions, are provided in indoor ventilation kit # 25995. FIG. 4b Underside View INTERIOR EXTERIOR Air Inlet Locate the air inlet directly beneath the heater and align it to the heaters air inlet for combustion air supply. Ensure the motorized air inlet and the heater’s air inlet are kept free of any blockages. 1 1/2 FT MAX.
Exhaust Fan FIG. 5 The exhaust fan must be located at an upper area of the end wall opposite from the heater, preferably in an area higher than the heater’s discharge. See Fig. 5. The fan does not need to be directly in line to the heater. Ensure the exhaust fan is kept free of blockage. EXHAUST FAN IN UPPER AREA OF GREEN HOUSE CHAIN OR CABLE AIR FL OW ENTRY / EXIT AIR INLET LOCATED DIRECTLY BENEATH HEATER AIR INLET.
SEDIMENT TRAP ASSEMBLY Assemble the tee, nipples and cap together and tighten securely. See Fig. 7. The sediment trap assembly must always be mounted in a vertical position. Make sure pipe thread compound that is resistant to both L.P. gas and natural gas is used in making all connections. Check all connections for gas leaks using approved gas leak detectors. FIG. 7 NIPPLE HOSE ADAPTER TEE TO GAS CONTROL VALVE INLET NIPPLE CAP HEATER CONTROLS Page 11 B. Single Stage Thermostat 1.
B. Single Stage Thermostat C Building Controller Connections - Heating (Non-Power Contacts) 1. Operate on first stage heat only. 1. Operate on first stage heat only.
3. Operate both stages of heat. FIRST STAGE HEAT CONTACT 24V GROUND TRANSFORMER YELLOW BROWN WHITE BLACK 120V IND L1 HSI HSIG L2 W PSI FSI GV PSO FSG C RED GREEN IGNITION CONTROL BROWN LO C HI GAS CONTROL VALVE GREEN YELLOW SECOND STAGE HEAT CONTACT BROWN HIGH LIMIT SWITCH GROUND MANUAL SHUT-OFF VALVE, HOSE AND REGULATOR ASSEMBLY 2. Assemble the components together according to the figure. This view is to show general assembly of the components only.
Start-Up Instructions For initial start-up after heater installation, follow steps 1-6. For normal start-up, simply set the thermostat above room temperature. 1. Connect electrical cord to an approved electrical outlet. 2. Set thermostat to desired room temperature. 3. This heater has a manually operated toggle style selector switch located on the top of the control box. (Open the fan motor access panel to view) This switch allows you to either heat or ventilate (no heat). See Fig.
Shut-Down Instructions If the heater is to be shut down for cleaning, maintenance or repair, follow steps 1 - 5. Otherwise, simply turn thermostat to “off” or “no heat” for standard shut down. 1. Close all manual fuel supply valves. 3. Turn the indicator on the gas control to “off”. 4. Turn thermostat to “off” or “no heat” position. 5. Disconnect the heater from the electrical supply. 2. With the heater lit, allow heater to burn off excess fuel in gas supply hose.
Service Instructions GENERAL WARNING Burn Hazard ■ Heater surfaces are hot for a period of time after the 4. The thermostat, and high limt switch can be tested by jumpering the suspect part out of the electrical circuit.: -- Reconnect the electrical supply and open fuel supply valves. heater has been shut down. ■ Allow the heater to cool before performing service, maintenance, or cleaning. -- If the heater lights, the component is defective and must be replaced.
AIR PROVING SWITCH 1. Remove two sheet metal screws holding air proving switch blower housing. Remove assembly by turning switch assembly 90 degrees so the switch paddle can be pulled through oblong hole on side of fan housing. See Fig. 12. 3. Disconnect the leads from the air proving switch. 4. When installing replacement switch, use care in not bending the switch arm, otherwise ignition problems may occur. FIG.
Gas Pressure Checks ■ The following explains a typical procedure to be C. Reading Pressures ■ Consult the dataplate on the heater or page 4 in this 1. With the heater operating, the pressure gauges should read the pressures specified on the dataplate. ■ Gas pressure measured at the inlet to the gas valve is 2. Do the readings at the inlet and outlet pressure gauges agree with that specified on the dataplate? If so, then no further checking or adjustment is required. Proceed to section D.
IGNITER 1. Disconnect the plastic male and female plugs located at the end of the igniter leads. See Fig. 16 2. Loosen the screw securing the igniter shield and the igniter to the mounting bracket. Remove the igniter and shield. 3. Ensure the igniter is located so the its lip on back side of igniter is resting on the edge of the mounting bracket and the mounting hole in the igniter aligns with the mounting hole in the bracket. 4.
Troubleshooting Instructions READ THIS ENTIRE SECTION BEFORE BEGINNING TO TROUBLESHOOT PROBLEMS. WARNING ■ This heater can start at any time. ■ 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 personal injury or death. The following troubleshooting guide provides systematic procedures for isolating equipment problems.
Check wiring for continuity between transformer and switch. Repair or replace No Yes Defective transformer. Relace transformer. No Yes No Is 24 volts delivered to thermostat? Yes Check all wiring for defects. Repair or repalce if needed. No Is proper voltage delivered to selector switch? Check wiring between transformer and thermostat. Check continuity. Repair as needed. Check data plate for electrical supply requirments. Provide proper voltage, contact electrician.
One Time Flash Pattern Begins Immediately After Condition Occurs. Long Flash Two seconds on, two seconds off repetitively for 15 minutes. Rapid Flash Problem LED Flashing Yes Yes Remove jumper from switch. Replace air proving switch flapper binding. Check for damage to fan housing. Defective wire or poor connections to air proving switch. repair wire or connections. No has air proving switch been jumpered? No Free the arm.
Two Times Flash pattern begins 12 seconds after condition occurs. (Pattern indicates lack of air proving in fan section of unit.) Yes If improper voltage is supplied, contact electrician. - OR If no voltage is supplied to motor, check wiring bewtween motor and ignition control. If good, replace control.
Is proper burner manifold pressure read at outlet of gas valve? Yes No Yes Yes Connect igniter to igniter power supply wiring. No Is igniter properly connected? No Yes No Are 115 volts supplied from terminal HSI on ignition control module to igniter? Yes Yes Check wiring between module and component. Repair or replace . No Has wiring been checked between ignition control and sensor? Defective igniter. Perform continuity check and replace igniter If necessary.
Motor “Hums”. Does Not Run. Motor Does Not Run Problem No No Yes Check all electrical connections. Verify proper voltage.. Contact an electrician if proper voltage is not present. Yes Is proper voltage supplied to selector switch ? Reconnect wires to capacitor. Check for damage to motor and fan assembly and housing. Repair or replace as necessary. Move the selector switch to the VENT position. Yes Yes Defective capacitor. Replace the motor.
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 delivering air for efficient air movement.
Parts Identification PARTS SCHEMATIC 29 30 30 24 23 27 31 36 28 37 22 25 34 26 38 33 21 20 39 32 18 19 17 14 16 15 13 12 1 5 6 7 8 9 11 2 10 3 4 28 35
Parts Identification PARTS LIST Item 1 2 3 4 5 6 7 8 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) Valve, Manual Shut Off with Nipple Hose, 1/2 in. 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.
