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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.

DC Power: 3.0 Volt DC (2 AA Alkaline batteries included).

Electrical Rating: 24 Volt AC (18-30 Volt AC) 1 amp maximum load per terminal 2 amp total maximum load (all terminals) (Model PSTS11NP) 3 amp total maximum load (all terminals) (Model PSTS21NP).

Any other use is not recommended and will void the warranty.

This thermostat should only be used as described in this manual.

Refer to “Low Battery Detection and Replacement” section for more information. This thermostat is a dual power thermostat and either requires 24 Volts AC Power or two (2) properly installed “AA” alkaline batteries for normal operation and control of the heating or cooling system.Always turn off power to the air conditioning or heating system prior to installing, removing, cleaning or servicing thermostat.

Specifications Installation Testing Your New Thermostat Programming User Settings Temperature Adjustmentįeatures 7 Battery Replacement 8 Troubleshooting 9 Wiring Diagrams Multi-Stage 2 Heat / 1 Cool Conventional and Heat Pumpīefore Installing, Programming or Operating, PLEASE READ ALL INSTRUCTIONS 1 2 3 4 5