Aspirator Control

The output of the control is open drain and can sink up to 300 mA. This is more than sufficient to handle the aspirator. Keep in mind, however, that both the aspirator and the VN10KN3 (output V-MOSFET) are polarity sensitive devices. Observe polarity as you assemble the plug and connect the wires.

A 12 VDC regulated power supply rated at 200 mA minimum can be used to run the fan. However, that is probably an overkill and not necessary. A 9VDC wall transformer capable of supplying about 200 mA should be more than sufficient. The voltage that comes out of most wall transformers is several volts higher than the rated voltage. In fact, a 12 VDC transformer may put out a voltage that is too high and damage the fan. Be sure you check the unloaded voltage before testing it with the fan.

Test the fan with the voltage source directly before hooking it up to the X1W-1. This will give you an opportunity to check for correct polarity and the loaded voltage. The loaded voltage should be somewhere close to 12V. The fan should work fine with anything between 10 and 13 volts.

Wires should be crimped and soldered to the pins insure a good electrical connection. While the pins can be inserted any number of ways into the housing, they should be oriented so that the raised tab on the pin snaps into the opening on the housing. See the illustrations.
  

Refer to the schematic on how to connect up the system.

Currently, only N4XI's WXN Server supports aspirator control. The software will automatically cycle the aspirator (fan) on when the relative humidity rises above a pre-determined level and off when it falls below. Consult the software documentation for more information.