Carrier 69NT40-541-306 Operation And Service
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2–3 T-3542.3.20 460 Volt CableVarious power cable and plug designs are available for the main 460 volt supply. The plug options tailor the cablesto each customer's requirements.2.3.21 230 Volt CableUnits equipped with an autotransformer require an additional power cable for connection to the 230 volt source. Vari-ous power cable and plug designs are available. The plug options tailor the cables to each customer's requirements.2.3.22 Cable RestraintVarious designs are available for storage of the power cables. These options are variations of the compressor sec-tion front cover.2.3.23 Upper Air (Fresh Air Make Up)The unit may be fitted with an upper fresh air makeup assembly. The fresh air makeup assembly is available with avent positioning sensor (VPS) and may also be fitted with screens.2.3.24 Lower Air (Fresh Air Make Up)The unit may be fitted with a lower fresh air makeup assembly. The fresh air makeup assembly is available with avent positioning sensor (VPS) and may also be fitted with screens.2.3.25 Arctic ModeTo improve operation in cold ambients, the unit may be fitted with a crankcase heater. The crankcase heater isoperated any time the unit is under power and the compressor is not running. The purpose of the heater is to warmthe compressor oil and boil off any liquid refrigerant that may be present in the crankcase.2.3.26 Power CorrectionThe unit may be fitted with a set of power factor correction capacitors to assist in correction of imbalance in currentdraw by the compressor.2.3.27 EvaporatorThe evaporator section is equipped with a hermetic thermal expansion valve and a heat exchanger. The unit mayhave six heaters.2.3.28 Evaporator Fan OperationTwo evaporator fan motor operation systems are available. On units with Normal Evaporator Fan Operation, open-ing of an evaporator fan internal protector will shut down the unit. On units equipped with single evaporator fancapability, additional relays are installed to allow the unit to continue to operate on a single fan.2.3.29 LabelsOperating instruction and function code listing labels will differ depending on the options installed. For example,additional operating instructions are required to describe start-up of a unit equipped with an autotransformer.Where the labels are available with additional languages, they are listed in the parts list.2.3.30 Plate SetEach unit is equipped with a tethered set of wiring schematic and wiring diagram plates. The plate sets are orderedusing a seven-digit base part number and a two-digit dash number.2.3.31 ControllerTwo different controllers are available:1. Re-manufactured - Controller is equivalent of a new OEM controller and is supplied with a 12 month warranty.2. Repaired - Controller has had previous faults repaired and upgraded with the latest software. |
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