Check the listing for details. ICM Controls ICM550 Multi-Functional Defrost Timer, Timed or Manual. Condition: New. Listed at 104.77 USD. Electrical HVAC Thermostats Thermostat Wire Tools Plumbing Features Timed or manual termination Adjustable 15 min to 23 hours 45 min defrost cycle High power relay outputs 100% monitoring of inputs and outputs Simple to use, drag & drop replacement for popular models User-friendly time clock Control with enclosure: Order ICM550-ENC Enclosure not sold separately Weatherproof Enclosure Ratings Rugged, NEMA/TYPE 4X rated plastic, weatherproof enclosure Easy to mount and lockable Helps to protect controls from harsh environmental conditions such as temperature, shock, humidity and vibration When mode B is selected and the unit is in the timed cycle (clock dip switches in the on position), the load will be turned on with the back up source. At the end of the timed cycle, the unit will return to normal operation until the next preset interval occurs. If Mode A is selected, the load be off during the timed cycle and the back up source will be on. At the end of the timed cycle, the unit will return to normal operation until the next preset interval occurs. Product Details Color Height Length UPC 800442123288 HVACSurplus.com works with a wide variety of brands that you know & trust. Some of our brands include: Aprilaire ∙ Belimo ∙ Braeburn ∙ CPS Products ∙ DiversiTech ∙ Ecobee ∙ Emerson ∙ Functional Devices ∙ GeneralAire ∙ Honeywell ∙ ICM Controls ∙ iO HVAC Controls ∙ Jackson Systems ∙ Johnson Controls ∙ Kidde ∙ LeakSmart ∙ Little Giant ∙ Lux ∙ Malco ∙ MA-Line ∙ NAVAC ∙ Nest ∙ Packard ∙ Peco ∙ Pro1 IAQ ∙ Ranco ∙ Rectorseal ∙ Resideo ∙ Ring ∙ Robertshaw ∙ SolderWeld ∙ Skytech ∙ Supco ∙ UEI Test Instruments ∙ Universal Secruity Instruments ∙ Vents US ∙ White-Rodgers