Turning your thermostat OFF
To turn your iSTAT Off, simply tap the “SYSTEM” key until the LCD
shows the word “OFF”.
To Review the set Temperature.
Simply tap the up or down key to turn the LCD backlight on and now
the LCD will change and display the currently set temperature(s).
Common Functions
The Keys Explained
System key
Tap this key to cycle the iSTAT thermostat through the available modes,
Heat only, Cool only, Auto season change over mode, Emergency Heat (if
fitted), and OFF. (Note - Not all modes may be active on your iSTAT)
NOTE, the installer may have activated the Anti freeze function where
your heating system will turn on whenever the room temperature falls
below 5 °C (41°F), regardless of the currently selected mode or whether
the iSTAT is On or Off.
Hold key
Commercial Programmable Mode.
This key initiates the after hours run timer where, for an installer
programmed period the iSTAT will replace the stop program temperatures
and temporarily use the start program temperatures to maintain the
building temperatures.
Residential Programmable Mode.
The “HOLD” key is used to override the current programs time sched-
ule and to hold the currently set temperature indefinitely. This set tempera-
ture will be maintained until released by tapping the “CANCEL” key. Timer
will be displayed in the LCD to confirm this function is active.
Temperature up key
Use temperature up key to increase the desired room temperature for
the heating or cooling modes, or increase a “value” in programming modes.
Also used to force override the preprogrammed temperatures and
temporarily replace them with a new higher set temperature.
Temperature down key
Use temperature down key to decrease the desired room temperature
for heating or cooling modes, or decrease a “value” in programming
modes. Also used to force override the preprogrammed temperatures and
temporarily replace them with a new lower set temperature.
Clock key
Tap the “CLOCK” key to begin setting the clock.
Sched key
Press the “SCHED” key to begin programming your daily events.
In Manual mode: Tap the “
SCHED
” key to switch between Day & Night
modes.
Fan key
Fan Single Speed Fan systems. Tap this key to cycle between
Continuous Fan (Fan ON) and Auto Fan. Three Speed Fan systems -
Tap this key to cycle between the 7 available fan modes being Low
speed, Medium speed, High speed & Auto Fan speeds in auto fan
mode and then Low speed, Medium speed, High speed in Fan ON mode.
If the iSTAT is OFF, tapping the “FAN” key will turn the fan ON or OFF
as desired. If your system has 3 fan speeds these can also be selected
by tapping the “FAN” key.
Wake Day Evening Sleep key
Tap this key can select period in programming mode.
Reset key
Tap Reset key to clean filter count.
Prog Day key
Tap this key to select project day in programming mode.
Cancel key
Tap this key to Cancel override mode and setting clock mode and etc.
Done key
Tap this key to finish setting.
Control Modes
Heat Only Mode
The iSTAT thermostat will turn on the Heating mode when the room
temperature falls below the Heat set point temperature. In Heat only mode
the iSTAT thermostat will NOT bring on the Cooling regardless of the room
temperature and the Cooling Set point temperature. In Heat only mode,
only the word “Heat” will be displayed in the LCD. When your iSTAT is
calling for heat, the word “Heating” will be displayed in the LCD. If the
word “Heat” is flashing in the LCD the iSTAT is performing a safety anti
cycle delay prior to restating the heating.
E. Heat Mode
The iSTAT thermostat will only use your emergency heating device to
maintain your desired heating temperature. This method of heating can
be quite expensive therefore it is not recommended to use emergency
heat mode unless it is essential. When your air conditioning system is
heating using emergency heat, the word “E.Heat” in the LCD will change
to the word “E.Heating”.
Cool Only Mode
The iSTAT thermostat will turn on the Cooling when the room
temperature rises above the Cool set point. In Cool only mode the
iSTAT thermostat will NOT bring on the Heating regardless of the room
temperature and Heating set point temperature. In Cool only mode, only
the word “Cool” will be displayed in the LCD. When your air conditioning
system is cooling, the word “Cool” in the LCD will change to the word
“Cooling”. If the word “Cool” is flashing in the LCD the iSTAT is performing
a safety anti cycle delay prior to restarting the Cooling.
Auto change Over Mode
The iSTAT thermostat will turn on the Heating if the room temperature
falls below the Heat Set point temperature and the Cooling if the room tem-
perature rises above the Cool Set point. This is the recommended mode as
it provides automatic control of the air conditioning system to maintain the
desired room temperature. Auto changeover mode is indicated by both the
words “Heat” & “Cool” in the LCD. If the word “Heat” or “Cool” is flashing in
the LCD the iSTAT is performing a safety anti-cycle delay prior to restating
the air conditioning system.
Fan Functions Explained
Auto Fan Mode
If the user has selected Auto Fan mode with the “FAN” key the indoor
fan will turn on when the heating or cooling turns on, and off again once
the heating or cooling turns off. To conserve energy your fan may continue
to run momentarily after the heating or cooling has stopped to extract all
the warm or cool air still remaining in the air condition system and bringthat
conditioned air into the building.