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Manuals and User Guides for Carrier Comfort FX4DNF037. We have 1 Carrier Comfort FX4DNF037 manual available for free PDF download: Product Data FMA. Service and Maintenance Instructions. Residential Fan Coil Units. NOTE: Read the entire instruction manual before starting the installation. Before installing or servicing fan coil, always turn off all power to unit. There may be more than 1 disconnect switch. Turn off accessory heater power ifNeed a product guide or manual? Just enter the model number below, and we'll give you a list of links to all the documents associated with it. The FX4D fan coils combine the proven technology of Carrier fan Factory-installed Puron® refrigerant thermostatic expansion valves (TXV). View online (16 pages) or download PDF (1 MB) Carrier Comfort FX4DNF061, Comfort FX4DNF037, FX4D series, Comfort FX4DNF049, Comfort FX4DNF043 PDF manual The FX4D fan coils combine the proven technology of Carrier fan coil units with Puron®, the environmentally sound refrigerant. The FX4D fan coils combine the proven technology of Carrier fan coil Factory-installed Puron® refrigerant thermostatic expansion valves (TXV).