Thermolec Split|Steam - Manual (Page 3)

Installing and Connecting the ACU-STEAM Humidistat and the Outdoor Sensor
1.1 The humidity sensor is located at the lower right side in the wall mount humidistat. Please see Fig.1a.
1.2 A three wire control cable (not supplied) has to be connected between the wall (or duct) electronic
humidistat and the humidifi er electronic board at the three terminals marked “H-STAT”.
Please respect the sequence and connect
GND to GND 24V to 24V ST1 to IN
1.3 The outdoor sensor S-15 (please see Fig.1c) is supplied with the humidistat. It could be installed on
an outside wall facing North or a fresh air duct. This outdoor sensor automatically reduces the setting of the
humidistat according to the outdoor temperature in order to avoid condensation on windows during extremely
cold days. It does the opposite during the mild days without your having to manually adjust the humidistat. The
outdoor sensor is a 10 kilo-ohms NTC thermistor (negative temperature coeffi cient). To install the S-15 on a
fresh air duct, drill a 3/8” hole in the duct, peel off the velcro backing and push the black tip of the sensor into
the duct while sticking the velcro to the duct.
GND 24VST1 COM ODR ST2 10V
Terminal
Block
Jumper
Red LED
Green LED
Humidity
sensor
Fig. 1a Wall Mount Humidistat
S-15
Fig. 1c