TechTime is a Neptronic publication aiming to inform you of common issues highlighted by our technical support team and the best way to deal with them. Each edition features three new topics and will be posted on neptronic.com.

Can You Turn Me On or Off?
Using Modulating SK300 Humidifier as On/Off

Ordered a modulating humidifier but have on/off controls? No problem, we have a solution for you!

The SK300 modulating units are capable to operate as an on/off unit with digital controls.

With these simple instructions, the SK300 humidifiers can be in operation in no time.

Instructions for the SK300 series without BACnet:

  1. Install the on/off humidistat in series with the PD switch (air pressure switch) between terminal 1 and 2.
  1. Install a wire between terminal 2 and 6. Terminal 2 provides 5Vdc to terminal 6 in order to simulate the actual humidity level at 50% RH.
  1. Press the Menu button to access programming mode. The first item is SETPOINT OUT (external control). To switch to INT (internal set point), press and hold the TEST button, located on the main PC board until INT is displayed.
  1. Set the SETPOINT INT value above 60%.
  1. The humidifier will be operating on full demand, use the contact between terminal 1 and 2 to enable and disable the humidifier

Instructions for the SK300 series with BACnet:

  1. Install the on/off humidistat in series with the PD switch (air pressure switch) between terminal F and 2. Note: When the On/Off thermostat is open, the LCD displays AIR FLOW OPEN instead of DEMAND 0%
  1. Press the Menu button to access programming mode. The first item is CONTROL EXTERNAL. Press the UP or DOWN button to select INTERNAL.
  1. Leave the default values for following steps in the menu
  • SP SOURC INTERNAL and
  • DUCT SRC DISABLE