... defrosting, two-stage automatic anti-freezing, built-in self-diagnosable system, and is controlled by microcomputer.Application to hotels, villas, ... heat pump(cooling only) VMN(A)068U,VMN(A)068M,VMN(A)088M,VMN(A)108M,VMN(A)180M,VMN(A)250M,VMN(A)320M,VMN(A) ... there are complete protect functions such as error self-detect system, balancing the compressor wear automatically, and anti-freezing ...