L.B. White Therma Grow Greenhouse 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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17AIR PROVING SWITCHSWITCH W/ PADDLELEADSNUTSPADDLEOBLONG HOLEHOUSING SIDEPANEL1. Remove two sheet metal screws holding air provingswitch blower housing. Remove assembly by turningswitch assembly 90 degrees so the switch paddlecan be pulled through oblong hole on side of fanhousing. See Fig. 13.3. Disconnect the leads from the air proving switch.4. When installing replacement switch, use care in notbending the switch arm, otherwise ignition problemsmay occur.FIG. 13The high limit switch should be tested a minimum of onceper year when the heater is given a thorough cleaning.1. Remove the high limit switch from the heatchamber.2. Holding the switch by one of its mounting legs orelectrical terminals, apply a small flame only to thesensing surface on the back of the switch. Becareful not to melt the plastic housing of the switchwhen conducting this test.3. Within a minute, you should hear a pop comingfrom the switch, which indicates the contacts of theswitch have opened.4. Allow the switch cool down for about a minutebefore firmly pressing the red reset button on theswitch.5. Check for electrical continuity across the switchterminals to make sure the contacts have closed.6. Reinstall the switch back into the heater.FIG. 14TESTING THE MANUAL RESET HIGH LIMIT SWITCHRESET BUTTONSENSINGSURFACETERMINALFLAMEMOUNTINGLEGWARNINGFire Hazard■ Do not operate the heater with the high limit switchbypassed.■ Operating the heater with a bypassed high limit switchmay lead to overheating, possibly resulting in a fire,with subsequent damage to the heater, buildingdamage, or loss of livestock.GAS CONTROL VALVE1. Remove the following-- Hose and sediment trap from inlet of gas valve-- Screws securing valve bracket to heater base.-- Burner bolt from underside of base.-- Screws and spacers securing burner casting toheat chamber.2. Remove control valve with burner from heater. Pivotthe valve/manifold assembly as necessary so orificeblock on manifold clears the burner casting venturiport..3. Replace components as needed.FIG. 15ORIFICEBLOCKGAS CONTROLVALVEBURNERORIFICE |
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