3PH-204 is a terminal interface between user and units. It usually installs indoors
to order on/off for air-condition terminal and set parameters; It can set activate
control to host unit through 3PH-800( the mate-product of 3PH series), it can cooperate with even 99 hand-operators.

This series product is innovation in current control mode for atmosphere; each control
not only has eight section and ice-water electric valve, but also can control
adding/dropping humiditor and ventilator. It can be equipped to inspect thickness
of CO2