Select electric for systems with electric furnace elements that require the fan to come on immediately. This will allow the furnace to run for a few seconds before initiating the fan. This switch controls the heating system fan delay. Locate the internal fan option switch, HG (Gas) / HE (Elec) on the circuit board. Using your fingers, flip the switch toward the preferred temperature ˚F / ˚C scale. Locate the internal ˚F /˚ C switch on the circuit board. Turn the front thermostat body over, exposing the rear view of the circuit board. Make sure all of the wire connections are secure and not touching any other terminal to prevent electrical shorts and potential damage to the thermostat. Connect wires to quick wiring terminal block using the new terminal designations. Fasten sub-base to wall using supplied screws. Place the thermostat sub-base against the wall in the desired location, making sure the mounting holes are aligned and the thermostat wires are inserted into the opening in sub-base. Gently tap supplied plastic anchors into the holes in the wall. ![]() Mark placement of mounting holes as appropriate and drill using a 3/16" drill bit. Guide thermostat wires through hole in sub-base. Place the thermostat sub-base against wall in the desired thermostat location. Remove front of thermostat body from sub-base by pressing release latch. Place fan control switch on front of thermostat to AUTO position. Place system switch on front of thermostat to OFF position. Turn off power to the air conditioning or heating system prior to installing thermostat. Do not use this thermostat on applications with voltages above 30 Volts AC.ġ. NOTE–MODEL PSTS21NP: This thermostat is designed for use with 24 Volt-AC low voltage multi-stage gas, oil or electric heating or cooling systems, including multi-stage heat pump systems. Do not use this thermostat on applications with voltages above 30 Volts AC. NOTE–MODEL PSTS11NP: This thermostat is designed for use with 24 Volt-AC low voltage single stage gas, oil or electric heating or cooling systems, including single stage heat pumps and can also be used on 250mv to 750mv millivolt heating only systems. Secure wires to prevent them from slipping into the hole in the wall. After labeling and removing all wires from terminals, unscrew the existing thermostat sub-base from wall. ![]() Old Terminal from New Terminal for New Terminal for Existing Thermostat New Thermostat New Thermostat (PSTS21NP) (PSTS11NP)Ģ4 VAC Reversing Valve (Heating) Reversing Valve (Cooling) Cooling or Compressor for HP System 1st Stage Heat or Emergency Heat Fan Control 24 VAC CommonĤ. Use the chart below to determine the new terminal designations for your new thermostat. Using small pieces of masking tape, label wires prior to removal from terminals. ![]() Remove the cover of your old thermostat and locate the wire terminals. Always turn off power to the air conditioning or heating system prior to removing existing thermostat.
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