User Manual

Page 4
Note. Option 16 in the installer menu (See page 16) permits you to set the SMT-131 to
automatically reset the indoor fan to Automatic Mode (cycle on and off with heating and cooling)
every time the thermostat is turned off and then back on if desired.
If Auto Fan mode is selected, then when the heating and cooling stops, so will the fan (after any
purge periods have expired if set- see page 16)
If Fan On mode is selected, then the fan will continue to run after the heating and cooling stops to
maintain ventilation.
Ventilation Mode
If permitted by DIP Sw7, (See page 5) the user can run the indoor fan only (Ventilation Mode)
when the SMT-131 is off by tapping the fan button. Each tap of the fan button will cycle between
all available fan speeds.
“Make up Room” & “Do Not Disturb” Buttons
When enabled by DIP Sw8, (See page 5) pressing these buttons will activate relevant LCD
segments and backlight colour on the optional outside door station as well as write data to
Modbus for monitoring by a BAS system.
Note - you do not need the outside door stations to be fitted if you simply wish this data to be
presented to Modbus.
Installation - HVAC Control
System Design
Great effort has been taken to make the SMT-131 system intuitive,
reliable and easy to install. Using a common-sense approach to the
installation will ensure this product is installed easily and to the
customer’s satisfaction. Please read and understand this instruction
manual so that installation, testing and commissioning process is
undertaken in an effective and efficient manner.
Opening Wall Controller
Open the SMT-131 wall controller by placing a flat blade screwdriver
or coin in the slot on the bottom of the thermostat case (1) and
gently twist (2) to release the case locking clip. Gently pry the two case halves apart at the base
taking care not to twist the case as this may crack the LCD.
Mounting wall Controller
The SMT-131 should be mounted in a convenient location at approximately 1.2 to 1.5 meters
from the ground. It should be in a “typical” location where it will sense the accurate room
temperature and not be affected by direct sunlight or drafts.
It is highly recommended that any penetrations in the wall where wiring may pass for example be
sealed to prevent drafts from entering the rear of the thermostat and effecting the room
temperature sensor accuracy.