SMART Temp has released the SMT-920 Viking multistage HVAC controller.
The SMT-920 Viking controller can control four compressor systems. It has separate fans and a reversing valve relay. It also integrates outside-air economy-cycle control.
The SMT-920 Viking has a seven-day time clock and 365-day event scheduling, real-time clock with auto daylight saving adjustment, and an after-hours run timer.