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Wind Qing Yang: After the civil service wages rose point between the stem and the drive module so microcomputer operate independently, and now all brands micro-controller on the market are almost no direct control Danfoss expansion valve, and the use of additional electronic 642 expansion valve drive module, driver module itself voluntarily collect temperature and refrigerant pressure. Almost no correlation, rarely will use additional local Danfoss 642 expansion valve driver module serial communication with the local micro-controller 642 communication link, but this use, changes in working conditions for large heat pump, it will not immediately 642 allow the expansion valve make the relative reactivity, leading to superheat changed so much, but MIRLE company to that point, the use of direct-drive mode controller, 642 the associated command and control of the expansion valve superheat instruction by instruction of the way, you can Danfoss expansion valve respond quickly to optimize the system.
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