L.B. White Premier 80 Owner's Manual And Instructions

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L.B. White Premier 80 Owner's Manual And Instructions Manual pdf 26 page image

Premier Ductable Heaterswww.lbwhite.comOwner’s Manual • Premier 80-17026Manual Reset High LimitSwitchesThis heater has two limit switches: one inside the soliddoor end on the heat chamber, the other inside thelouvered door end mounted on the fan housing sidepanel. Both are easily identified by a red reset button inthe center of the switch. See Figs. 26 and 27, Premier170 shown.FIG. 26FIG. 27FunctionIf the heater overheats, one or both of the limit switchescan trip, opening the electrcial circuit to the gas controlvalve. Overheating is generally caused by duct restric-tions, low voltage, blocking the heater’s air inlet, or exces-sive gas pressure.ResettingIf either trips, remove the red cap and firmly press thereset button in the middle of the switch. Then, shut theheater off and turn it back on. Determine the cause of thelimit tripping.TestingTo ensure proper function of these critcal safety compo-nents, both switches should be tested annually, typicallywhen the heater is given a thorough cleaning.1. Remove either high limit switch.2. Holding the switch by one of its mounting legs, applya small, soft flame only to the sensing portion on theback of the switch. See Fig. 28. Be careful not to meltthe plastic housing of the switch when conducting thistest.3. Within a minute, you should hear a click coming fromthe switch, indicating the contacts of the switch haveopened.4. Allow the switch cool down for about a minute. Removethe red cap and firmly press the reset button on theswitch.5. Check for electrical continuity across the switch ter-minals to make sure the contacts have closed. Installthe red cap.FIG. 28WARNINGFire Hazard■ Do not operate the heater with the high limitswitch bypassed.■ Operating the heater bypassed high limit switchmay lead to overheating, possibly resulting in afire, with subsequent damage to the heater orproperty damage.Burner end high limitFan endhigh limit RESET BUTTONSENSINGSURFACETERMINALFLAMEMOUNTINGLEG