ParkSmart Bunk A/C System 运费liner P3 Cascadia
作者Larry Turay, MACS撰稿人
Since the introduction of the Cascadia platform in 2007, the ParkSmart auxiliary HVAC system has been offered to replace the standard auxiliary HVAC unit. ParkSmart是一个电池供电的空调系统, 燃料加热器和辅助控制装置, which eliminates the need for the engine to operate when the operator is in parked mode. This concept helps to reduce emissions and conserves fuel. The system functions differently from the standard auxiliary HVAC system. ParkSmart works in conjunction with the vehicle’s main HVAC system while the engine is running and independent of the vehicle’s main system when the engine is off. It has a 12-volt electric compressor and condenser fan and a fuel operated coolant heater. 当发动机运转时, the air conditioning unit is powered by the vehicle electrical system, and the auxiliary heater core is supplied using engine coolant. The ParkSmart AGM batteries are connected to the electrical system so they will be recharged by the alternator.
The ParkSmart unit contains a stand-alone refrigerant loop separate from the main HVAC system. 它是 not affected by the front refrigerant system. In the system design from 2007 until July of 2010, 的制冷剂, 油和制冷剂充注量无法调整, and any problems with components or charge within 的制冷剂 loop required unit replacement. 从2010年到2016年, 系统分裂了, and 的制冷剂 charge could be removed and recharged, 调整油位和制冷剂管路, 干燥机, pressure switch and condenser changed without replacing the components in the bunk area.
The ParkSmart system is designed to maintain an already cooled sleeper area at a comfortable level for a limited amount of time depending on the selected settings and ambient conditions. 它是 不 designed to, nor will it cool down a hot sleeper while operating in parked mode! 在停模式, the auxiliary unit operates on a dedicated set of AGM batteries separated from the vehicle’s starting batteries by a bi-stable solenoid interconnect controller. The vehicle’s charging system recharges the batteries when the engine is running.
The ParkSmart unit controls the temperature in the sleeper area with a sensor mounted in the sleeper control panel. The temperature range is from 60 F (15 C) to 85 F (29 C). 在铺位区预处理后, 引擎还在运转，铺位窗帘也开着, the unit is designed to maintain a comfortable bunk temperature for up to 12 hours with the bunk curtain closed.
There are three operating modes for ParkSmart: Engine On, Engine OFF, Parked. 当机组打开时, 无论模式或温度设置, 冷凝器风扇将运行长达30秒.
If the engine is On, the ParkSmart runs on the power supplied by the alternator. 当引擎在运转时, ParkSmart以最大输出运行, which lengthens the time needed to recharge the batteries after a night with the unit in Parked mode.
如果引擎处于关闭状态, 和OFF键, pushing the PARK button with the blower in any mode but 0, activates the parked mode; it draws power from all eight batteries until battery voltage reaches 12.5伏特. Then the bi-stable solenoid separator will open and the ParkSmart will run on the back batteries’ unit voltage reaches 11.三伏电压，装置就关闭了.
If the engine is OFF and the key is in the ACC or ON position, 机组在通风模式下运行, 运行鼓风机，但不运行压缩机. The PARK button must be pushed to turn on the compressor.
The system consists of parts and technologies provided to 运费liner by three suppliers; Valeo, Bergstrom和埃斯珀. Due to the differences between normal HVAC systems and the ParkSmart, there is confusion in the field about how the system is designed to work and how it should be serviced. 这些问题将在下一期讨论!
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