L.B. White Therma Grow HW220 Owner's Manual And Instructions
Also see for Therma Grow HW220: Owner's manual and instructionsOwner's manual and instructionsOwner's manual and instructions
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Contents
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OUTLET PRESSURE TINLET PRESSURE TAPONOFFATTENTION■ The following explains a typical procedure to be followedin checking gas pressures.■ The gas pressures will vary depending upon fuel type.■ Consult the dataplate on the heater or page 4 in thismanual for specific pressures to be used in conjunctionwith this procedure.■ Gas pressure measured at the inlet to the gas valve isInlet Pressure and gas pressure measured at the outletof the gas valve is Burner Manifold Pressure.AA. Preparation1. Obtain two pressure gauges capable of reading up to35 in. W.C.2. Disconnect the heater from the electrical supply andclose the fuel supply valve to the heater inlet.3. Open the burner access panel.4. Brush or blow off any dust and dirt on or in the vicinityof the gas control valve.B. Gauge Installation1. Locate the inlet and outlet pressure taps, see Fig. 15.Remove the pressure tap plug using a 3/16 in. allenkey.FIG. 152. Securely connect a pressure gauge to each pressuretap.3. Open the fuel supply valves to the heater andreconnect the heater electrical supply.4. Start the heaterC. Reading Pressures1. With the heater operating, the pressure gaugesshould read the pressures specified on the dataplate.2. Do the readings at the inlet and outlet pressuregauges agree with that specified on the dataplate?If so, then no further checking or adjustment isrequired. Proceed to section D.3. If the inlet pressures do not agree with that specifiedon the dataplate, then the regulator controlling gaspressure to the heater requires adjustment.4. If the inlet pressures are correct and the burnermanifold pressure does not agree with that specifedon the dataplate, then the gas control valve’s internalpressure regulator requires adjustment. See Fig. 16for regulator location.FIG. 16D. Completion1. Once the proper inlet and burner manifold pressureshave been confirmed and/or properly set, close thefuel supply valve to the heater and allow the heater toburn off any gas remaining in the gas supply line.2. Disconnect the heater from its electrical supply.3. Remove the gauges and connecting hoses.4. Install pressure tap plugs and tighten securely.Check for gas leaks.Gas Pressure ChecksWARNING■ Do not disassemble the gas control valve.■ Do not attempt to replace any components of the gascontrol valve.■ The gas control valve must be replaced if any physicaldamage occurs to the control valve assembly.■ Failure to follow this warning will result in fire orexplosions, leading to injury or death to humans, andproperty damage.16LOW PRESSURE GUAGEOUTLET PRESSURE TAPINLET PRESSURE TAPLOW PRESSURE GUAGEEXAMPLE SHOWS PRESSURE FOR PROPANE GASALWAYS REFER TO PRESSURE ON DATAPLATEOFFONINTERNAL PRESSURE REGULATOROUTLET PRESSURETAPTYPICAL PRESSURE GAUGE INSTALLATION. ALWAYSREFER TO DATA PLATE FOR FUEL TYPE ANDPRESSURE REQUIREMENTS. |
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