Description

This standalone micro-controller based LCD temperature controller provides proportional plus integral (P+I) and on/off temperature control for commercial Heating, Ventilating & Air Conditioning System such as Hydronic Heating, Air Handling Unit, Heat Exchanger or Condensing Tower. This controller has a modulating analog 2 to 10Vdc or 4 to 20mA output and a 2A on/off output to realize various optional control functions including cool/heat changeover, heat/cool sequence control, emergency interlocking and auto-alarming control. Description • PI (proportional plus integral) control action provides accurate, stable and comfortable temperature control. • Compatible with series 70 direct-coupled damper / valve actuator like ML7161, ML7174, ML7420 / ML7421series ML7425, ML7984 series, N20010, S10010, M7410E series, CN7505, CN7510 / CN72 series CN7220 & CN7234 also VC79 series etc. • Backlit LCD to display both setting and measured value. • Adjustable Zero Energy Band, On/Off Differential, Proportional Band and Temperature Offset. • Analog output can be forced manually to be convenient for installation & commissioning. • Optional 2 to 10Vdc or 4 to 20mA direct acting and reverse acting analog output. • Selectable internal and external temperature sensor. • Wide temperature control range (-20 to 110 °C by using external temperature sensor) is suitable for extreme temperature control such as steam and ice water. • Watch Dog Timer: to resume the controller from hanging condition. • Brownout effect to avoid malfunctioning and care on power ON and power OFF. • Pluggable terminal block allows pre-wiring outside of the controller. • Compact size and slim design provide elegant and attractive modern style appearance.