Uni-Line Perfect Sense PS4000 Installation And Owner's Manual page 79

BATTERIES (2)
- + -
4. Align the screw blocks with the pins on the
back of the thermostat.
PS4000/PS5000 Touchscreen Programmable Thermostat
WALL PLATE
+
TERMINAL SCREW BLOCK
PINS ON BACK OF
5. Push the thermostat straight onto the
wall plate until it snaps into place.
THERMOSTAT
77