Neptronic HRO20 Specification & Installation Instructions

HRO20/100921 1 Technical Data HRO20 Outputs Actual humidity (0-100%RH), 0-10 Vdc / 2-10 Vdc Humidity set point (0-100%RH), 0-10 Vdc / 2-10 Vdc Humidification proportional control signal, 0-10 Vdc / 2-10 Vdc Dehumidification proportional control signal, 0-10 Vdc / 2-10 Vdc Humidification dry contracts ...

2 Mounting Instructions A E D C B CAUTION: Risk of malfunction. Remove power prior to separate humidistat cover from its base. A. Remove the screw (captive) holding the base and the front cover of the humidistat. B. Lift the front cover of the humidistat to separate it from the base. C. Pull wire through the ba ...

3 Programming Mode When in this mode this symbol is displayed. Please press on button to advance to the next program function, press on button to return to preceding stage and press on button or to change value. You can leave the programming mode at any time, changed values will be recorded. Step Display D ...

4 Step Display Description Values 8 Adjust dehumidify set point: Display shows “adjust dehumi setpnt” and the dehumidify set point. You can change the dehumidify set point to the desired value; it should be within the humidity range. Lock symbol will appear if the set point was locked at step #5. Set point ...

5 Step Display Description Values 16 Minimum voltage of AO4 output: Display shows “min vdc analog ao4 output” and the value of the minimum voltage of the signal “0.0” for 0 to 10 Vdc or “2.0” for 2 to 10 Vdc. Humidify symbol is also displayed. Please select the desired value of the minimum voltage o ...

6 Operation Mode Step Description Display A At powering up, humidistat will light display and activate all LCD segments during 2 seconds. Illuminating the LCD To illuminate the LCD, you just have to push onto any of the 4 buttons. LCD will light for 4 seconds. Humidity display In operation mode, humidistat will ...

7 Typical Wiring with SK300 Humidifier humidistat 24 VAC Pressure Differential switch High limit 1 4 3 2 F 8 7 5 6 9 Control terminal block wiring Low voltage control terminal block High voltage power terminal block L1 L2 L3 F 5 2 3 4 1 8 9 6 7 5 Vdc HRO20 16 14 15 13 12 MOD Set point %RH COM Typical Wiring wit ...

8 Typical Wiring with SKG Humidifier Common 24 VAC %RH Control Signal 1 3 2 4 5 6 7 8 9 1 2 3 4 5 6 1 2 3 R- R+ LAST ANLG OUT 1 2 3 4 5 X 6 7 8 9 DUCT HUMID. ROOM HUMID. CTRL DEMAND INTER LOCK PD SWITCH HI-LIM 24 VAC 700MA MAX. TB1 TB2 JP2 JP1 DS1 O N P1 RS-232 A+ B- TB3 RS-485 COM NO NC COM NO NC ALARM FAN To ...