On-demand pumps have a pressure switch that makes the pump build up pressure in the freshwater line.
按需水泵有一个压力开关，使泵在淡水输送线上产生压力。
2
Adjust the freshwater in the peak tank. Pump the freshwater from the fore peak tank into the aft. Then we needn't make any alterations on the cargo plan.
调整一下尖舱里的淡水，把淡水从首尖舱抽到尾尖舱，这样我们就不用在积载图上做修改了。
3
Applies the heat pump driven liquid desiccant fresh air handling unit to treat fresh air, ground source heat pump to provide cooling, heating and domestic hot water.