Lochinvar & A.O. Smith 100304140 Control Board L99H008 Rotate clockwise to increase superheat Rotate clockwise to increase superheat (reduce flow) or counter clockwise to decrease superheat (increase flow) This crankcase heater is required for any HVAC system operating in low ambient conditions or systems where the compressor is exposed to temperatures lower than the evaporator to prevent liquid refrigerant from settling in the oil This board is primarily designed for the Lochinvar Knight Fire Tube series Advanced Diagnostics: Fully compatible with color coded SMART SYSTEM™ displays for rapid troubleshooting and error code identification
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Lochinvar & A.O. Smith 100304140 Control Board L99H008 Rotate clockwise to increase superheat