3-3
Module 4 –
Wireless HVAC Thermostats
ST898ZB Optima S Thermostat
Section 3
Use the wall anchors and screws supplied with the
Optima Thermostat to attach the Mounting Plate
to the wall, making sure the wires go through the
center opening .
Match each wire to the intended terminal .
• Push the latch to the right of the terminal to be connected
• Insert the wire into the terminal and release the button
• If properly engaged, the button will remain slightly
depressed when released
Refer to the wire tags, wiring schematic and/or
photograph taken earlier if necessary .
The Optima S Thermostat will prioritize power from the AC
connection (RC to C) . If AC power is not available, the device
will switch to the internal batteries . If the batteries are
not installed, install them in the Thermostat, observing the
CORRECT POLARITY .
• Use alkaline batteries (low battery sensor is tuned to
alkaline batteries)
• DO NOT Mix old and new batteries
• DO NOT Mix Alkaline, Ni-Cad, Lithium batteries
To cover screw holes or paint disturbance from
the old thermostat, install the Trim Plate between
the wall and the Mounting Plate . The Trim
Plate can be mounted vertically or horizontally .
Step 5.
Attach wiring to the Mounting Plate .
Step 6.
Remove the battery tab to activate the batteries
Step 4.
Install the Mounting Plate .
