... displays working status such as room temperature, set point, fan speed, etc. Makes reading and operating easy and accurate. ... 10%, 50/60HZ Outputs 3Xon/off outputs for 3-speed fan 1 or 2Xon/off output for water valves. ... 2-pipes FCU systems F08-NSB-21-(F) 3-speed fan auto or manual adjustment, 1X on/off output ... 4-pipes FCU systems F08-NSB-22-(F) 3-speed fan auto or manual adjustment, 2X on/off outputs ...