[3] O/B set to control as either O or B in installersetup. [4] If L terminal is used, 24VAC common (terminal C) must be connected. [5] Heat pump reset (powered continuously when thermostat is set to Em. Heat; system monitor
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PRO TH4000 Series 5 69-1928EFS—01 ENGLISH MCR29489 TH4110D only: • Gas or Oil: For gas or oil heating systems, leave the fan operation switch in this factory-set position.
Disconnect power before beginning installation. 2.1 Removing the old thermostat IN ORDER TO AVOID ANY RISK OF ELECTRIC SHOCK, CUT POWER TO THE HEATING SYSTEM. Remove the old thermostat to access the wires. WARNING: If the old therm
1.8 Install quick reference card Fold quick reference card along score lines, and slide it into the slot on the back of the thermostat. 1.9 Attach thermostat to wallplate Align the thermostat onto wallplate and snap into place. Bac
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