2
Mechanical design
Thermostat appearance
FanOperation
LCDdisplay
Function
ModulatingValve control
Thermostat acquires the room temperature via its
integrated sensor andmaintains the setpoint by
deliveringmodulatingoutput.
Heat/Cool/Vent
Pressing themodebutton to select heat, cool or vent
mode.
Fan canbe selectedasmanual or automatic 3-speed
operation. InManual mode, the fan is switched to the
selected speed via control output Gh, Gm, Gl.
Inautomaticmode, fan speeddepends on the
differencebetween room temperatureand setpoint.
When room temperature reaches setpoint, valvewill
be closedandmeanwhile, fanwill be closedeither.
Temperaturedisplay
Thedisplayed temperature canbe set todisplay
room temperatureor setpoint. The setting canbe
madeduring ISUprocess.
Timeon/off
When the thermostat is off, holdingpower button for
3 seconds, systemwill enter ‘timeon’ mode.When
the thermostat is on, holdingpower button for 3
seconds, systemwill enter ‘timeoff’ mode.
The rangeof ‘timeon’ or ‘timeoff’ is from0 to12
hours. The step is 0.5hour and thedefault time is 0.
Backlight
Pressingany keywill activate thebacklight.
Backlight will turnoff after 8 seconds.When in ISU
modeor ‘Installer test’ mode, thebacklight will turn
off after 60 secondswithout operation.
