Saswell SAS900STK-2, Operating Instruction

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9. Insert stripped, labeled wires into matching wire terminals. See “Wiring
Diagrams”, Section 3, Figure 3.
CAUTION: Be sure exposed portions of wires do not touch other wires.
10. Tighten screws on terminal block. Gently tug on each wire to be sure of
proper connection. Double check that each wire is connected to the proper
terminal.
CAUTION: Installing batteries backwards can damage the thermostat.
11. Install two fresh “AAA” alkaline batteries in the battery compartment. Be sure to
match positive (+) ends of batteries with positive (+) battery terminals in the
battery compartment. (The thermostat will operate from 2 size “AAA” alkaline
batteries or 24VAC power. When operated from 24VAC power, your thermostat
will maintain time and continuously display the temperature during a loss of AC
power with the batteries installed.)